From patchwork Thu Nov 26 13:03:39 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11933493 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7724CC64E7C for ; Thu, 26 Nov 2020 13:06:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2B2D621D7E for ; Thu, 26 Nov 2020 13:06:57 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="CKiJTlzf" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389836AbgKZNGt (ORCPT ); Thu, 26 Nov 2020 08:06:49 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53002 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388291AbgKZNGt (ORCPT ); Thu, 26 Nov 2020 08:06:49 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 58505C0613D4; Thu, 26 Nov 2020 05:06:49 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=q/6oPwiIP+97CmAmgE17x+n1vZ9NZz+/8fOXv1YD02c=; b=CKiJTlzf+8VqzQ06ysNrtR/UZw TGrKvO+bYRL97+fFPOZguxlu3f26ADKUIfmu0oEem3di997h8Ub0UCo8oi13Km9WZSMkuhBzF2GNm mC7nA9oX5yAQJe99SWbeyQh49zghRM+szlWGX11Maalp5prxXm8LKjBkv72zqwGdbUd/5scFs8dr9 xU/RHo/Cz+itNCJwYjYW8DwqVyGetc+ytcsGb54m1t7S8brnirFPXt4MC9SAHivbZu711cGXa9Qjh P0mnigCszHTA4BZVoE4d5157nOEq+IWmWyBZue4PlvBNSTrJKDgwbfTU5Eh7m+YYNQ2ln7dll1cJE 9lpcLg3Q==; Received: from [2001:4bb8:18c:1dd6:27b8:b8a1:c13e:ceb1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGyq-0003wD-BQ; Thu, 26 Nov 2020 13:06:36 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , dm-devel@redhat.com, Jan Kara , linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, Hannes Reinecke Subject: [PATCH 01/44] blk-cgroup: fix a hd_struct leak in blkcg_fill_root_iostats Date: Thu, 26 Nov 2020 14:03:39 +0100 Message-Id: <20201126130422.92945-2-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201126130422.92945-1-hch@lst.de> References: <20201126130422.92945-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org disk_get_part needs to be paired with a disk_put_part. Fixes: ef45fe470e1 ("blk-cgroup: show global disk stats in root cgroup io.stat") Signed-off-by: Christoph Hellwig Reviewed-by: Greg Kroah-Hartman Reviewed-by: Jan Kara Reviewed-by: Hannes Reinecke Reviewed-by: Johannes Thumshirn Acked-by: Tejun Heo --- block/blk-cgroup.c | 1 + 1 file changed, 1 insertion(+) diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c index c68bdf58c9a6e1..54fbe1e80cc41a 100644 --- a/block/blk-cgroup.c +++ b/block/blk-cgroup.c @@ -849,6 +849,7 @@ static void blkcg_fill_root_iostats(void) blkg_iostat_set(&blkg->iostat.cur, &tmp); u64_stats_update_end(&blkg->iostat.sync); } + disk_put_part(part); } } From patchwork Thu Nov 26 13:03:40 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11933495 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 02A2AC63777 for ; Thu, 26 Nov 2020 13:06:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9BBE721D7E for ; Thu, 26 Nov 2020 13:06:57 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="Tzdtw/yB" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389841AbgKZNGu (ORCPT ); Thu, 26 Nov 2020 08:06:50 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53004 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388291AbgKZNGu (ORCPT ); Thu, 26 Nov 2020 08:06:50 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1274DC0613D4; Thu, 26 Nov 2020 05:06:50 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=Lt23dvr/EePId5z235Ac/5RuSuqAjNhom33xSrBSmHc=; b=Tzdtw/yBul1Zx4LsFoDDzBliGo vlm6QI7NI0S/m39f0pGasxDy2YXD02CPzGfaBU+mth1yLhghT2xT7IIe7NfOP7JfWd81DpuNTuZ6J fGTUsnFRln1WrtYyffsKFKrmW8pR2YSewD+fdzpdHFCNeZ6uKFeP9Z9g4ZUxV874dE60DWp76w7kZ tlqZ7LNDRbxNvAgxMFZhhXPNBGkzumbPvfARkd9mgiNrNiTWK5LtDB5aew5lDV+Xa6Xi7pow7iwIO Qn3jndRxHZ31Ao7d7fmsn1GYpSqFtB/1CBvL3i4yncHY5A+XGdhgzGHHEa1AvkDTQBcMGHd8qqo7o wQbAXz4g==; Received: from [2001:4bb8:18c:1dd6:27b8:b8a1:c13e:ceb1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGyr-0003wL-Jh; Thu, 26 Nov 2020 13:06:37 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , dm-devel@redhat.com, Jan Kara , linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, Hannes Reinecke , Matthew Wilcox Subject: [PATCH 02/44] filemap: consistently use ->f_mapping over ->i_mapping Date: Thu, 26 Nov 2020 14:03:40 +0100 Message-Id: <20201126130422.92945-3-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201126130422.92945-1-hch@lst.de> References: <20201126130422.92945-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Use file->f_mapping in all remaining places that have a struct file available to properly handle the case where inode->i_mapping != file_inode(file)->i_mapping. Signed-off-by: Christoph Hellwig Reviewed-by: Jan Kara Reviewed-by: Hannes Reinecke Reviewed-by: Matthew Wilcox (Oracle) --- mm/filemap.c | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-) diff --git a/mm/filemap.c b/mm/filemap.c index d5e7c2029d16b4..4f583489aa3c2a 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -2886,14 +2886,14 @@ EXPORT_SYMBOL(filemap_map_pages); vm_fault_t filemap_page_mkwrite(struct vm_fault *vmf) { + struct address_space *mapping = vmf->vma->vm_file->f_mapping; struct page *page = vmf->page; - struct inode *inode = file_inode(vmf->vma->vm_file); vm_fault_t ret = VM_FAULT_LOCKED; - sb_start_pagefault(inode->i_sb); + sb_start_pagefault(mapping->host->i_sb); file_update_time(vmf->vma->vm_file); lock_page(page); - if (page->mapping != inode->i_mapping) { + if (page->mapping != mapping) { unlock_page(page); ret = VM_FAULT_NOPAGE; goto out; @@ -2906,7 +2906,7 @@ vm_fault_t filemap_page_mkwrite(struct vm_fault *vmf) set_page_dirty(page); wait_for_stable_page(page); out: - sb_end_pagefault(inode->i_sb); + sb_end_pagefault(mapping->host->i_sb); return ret; } @@ -3149,10 +3149,9 @@ void dio_warn_stale_pagecache(struct file *filp) { static DEFINE_RATELIMIT_STATE(_rs, 86400 * HZ, DEFAULT_RATELIMIT_BURST); char pathname[128]; - struct inode *inode = file_inode(filp); char *path; - errseq_set(&inode->i_mapping->wb_err, -EIO); + errseq_set(&filp->f_mapping->wb_err, -EIO); if (__ratelimit(&_rs)) { path = file_path(filp, pathname, sizeof(pathname)); if (IS_ERR(path)) @@ -3179,7 +3178,7 @@ generic_file_direct_write(struct kiocb *iocb, struct iov_iter *from) if (iocb->ki_flags & IOCB_NOWAIT) { /* If there are pages to writeback, return */ - if (filemap_range_has_page(inode->i_mapping, pos, + if (filemap_range_has_page(file->f_mapping, pos, pos + write_len - 1)) return -EAGAIN; } else { From patchwork Thu Nov 26 13:03:41 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11933497 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BF35EC71155 for ; Thu, 26 Nov 2020 13:06:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6964921D46 for ; Thu, 26 Nov 2020 13:06:58 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="T24et5TX" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389865AbgKZNGw (ORCPT ); Thu, 26 Nov 2020 08:06:52 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53012 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389842AbgKZNGv (ORCPT ); Thu, 26 Nov 2020 08:06:51 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4E1B4C0617A7; Thu, 26 Nov 2020 05:06:51 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=XnXdcQtajIOk6W1AjzTgGSRfD1WpR1y99lVXhBEiUaA=; b=T24et5TXruOuaLikxde8zjbFq2 alZbvSGO8obX2HcQfQIUHBwxKBu//tTldFMU7kivVnN2YXfNGaruEWmEYBXmafcW39quZNdieUmmW 8gapO5pqJQ+oYJLHTVo8kH6afQIN4CIwUEKigO6kJ4rwfPpsHyd0rtj2fDeQTWQjswJjDqv0djcI7 NLOHaBT3nYHtkp54MPBjj8GQJfByZy+kD81CknCcdEJOFbaGX70dZTWrLXn9s++hmkP5TW0f2H1aF pdej/bw1qMMXVOH/CpM5Fj/qt2Unj9fnskMzEmPNsgwLChtTSLyjjGwt8J7dOflqco0Y2YRaY3guW s52OEbrQ==; Received: from [2001:4bb8:18c:1dd6:27b8:b8a1:c13e:ceb1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGys-0003wR-ME; Thu, 26 Nov 2020 13:06:39 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , dm-devel@redhat.com, Jan Kara , linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, Hannes Reinecke Subject: [PATCH 03/44] fs: remove get_super_thawed and get_super_exclusive_thawed Date: Thu, 26 Nov 2020 14:03:41 +0100 Message-Id: <20201126130422.92945-4-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201126130422.92945-1-hch@lst.de> References: <20201126130422.92945-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Just open code the wait in the only caller of both functions. Signed-off-by: Christoph Hellwig Reviewed-by: Jan Kara Reviewed-by: Hannes Reinecke --- fs/internal.h | 2 ++ fs/quota/quota.c | 31 +++++++++++++++++++++------- fs/super.c | 51 ++-------------------------------------------- include/linux/fs.h | 4 +--- 4 files changed, 29 insertions(+), 59 deletions(-) diff --git a/fs/internal.h b/fs/internal.h index a7cd0f64faa4ab..47be21dfeebef5 100644 --- a/fs/internal.h +++ b/fs/internal.h @@ -114,7 +114,9 @@ extern struct file *alloc_empty_file_noaccount(int, const struct cred *); */ extern int reconfigure_super(struct fs_context *); extern bool trylock_super(struct super_block *sb); +struct super_block *__get_super(struct block_device *bdev, bool excl); extern struct super_block *user_get_super(dev_t); +void put_super(struct super_block *sb); extern bool mount_capable(struct fs_context *); /* diff --git a/fs/quota/quota.c b/fs/quota/quota.c index 9af95c7a0bbe3c..f3d32b0d9008f2 100644 --- a/fs/quota/quota.c +++ b/fs/quota/quota.c @@ -20,6 +20,7 @@ #include #include #include "compat.h" +#include "../internal.h" static int check_quotactl_permission(struct super_block *sb, int type, int cmd, qid_t id) @@ -868,6 +869,7 @@ static struct super_block *quotactl_block(const char __user *special, int cmd) struct block_device *bdev; struct super_block *sb; struct filename *tmp = getname(special); + bool excl = false, thawed = false; if (IS_ERR(tmp)) return ERR_CAST(tmp); @@ -875,17 +877,32 @@ static struct super_block *quotactl_block(const char __user *special, int cmd) putname(tmp); if (IS_ERR(bdev)) return ERR_CAST(bdev); - if (quotactl_cmd_onoff(cmd)) - sb = get_super_exclusive_thawed(bdev); - else if (quotactl_cmd_write(cmd)) - sb = get_super_thawed(bdev); - else - sb = get_super(bdev); + + if (quotactl_cmd_onoff(cmd)) { + excl = true; + thawed = true; + } else if (quotactl_cmd_write(cmd)) { + thawed = true; + } + +retry: + sb = __get_super(bdev, excl); + if (thawed && sb && sb->s_writers.frozen != SB_UNFROZEN) { + if (excl) + up_write(&sb->s_umount); + else + up_read(&sb->s_umount); + wait_event(sb->s_writers.wait_unfrozen, + sb->s_writers.frozen == SB_UNFROZEN); + put_super(sb); + goto retry; + } + bdput(bdev); if (!sb) return ERR_PTR(-ENODEV); - return sb; + #else return ERR_PTR(-ENODEV); #endif diff --git a/fs/super.c b/fs/super.c index 98bb0629ee108e..343e5c1e538d2a 100644 --- a/fs/super.c +++ b/fs/super.c @@ -307,7 +307,7 @@ static void __put_super(struct super_block *s) * Drops a temporary reference, frees superblock if there's no * references left. */ -static void put_super(struct super_block *sb) +void put_super(struct super_block *sb) { spin_lock(&sb_lock); __put_super(sb); @@ -740,7 +740,7 @@ void iterate_supers_type(struct file_system_type *type, EXPORT_SYMBOL(iterate_supers_type); -static struct super_block *__get_super(struct block_device *bdev, bool excl) +struct super_block *__get_super(struct block_device *bdev, bool excl) { struct super_block *sb; @@ -789,53 +789,6 @@ struct super_block *get_super(struct block_device *bdev) } EXPORT_SYMBOL(get_super); -static struct super_block *__get_super_thawed(struct block_device *bdev, - bool excl) -{ - while (1) { - struct super_block *s = __get_super(bdev, excl); - if (!s || s->s_writers.frozen == SB_UNFROZEN) - return s; - if (!excl) - up_read(&s->s_umount); - else - up_write(&s->s_umount); - wait_event(s->s_writers.wait_unfrozen, - s->s_writers.frozen == SB_UNFROZEN); - put_super(s); - } -} - -/** - * get_super_thawed - get thawed superblock of a device - * @bdev: device to get the superblock for - * - * Scans the superblock list and finds the superblock of the file system - * mounted on the device. The superblock is returned once it is thawed - * (or immediately if it was not frozen). %NULL is returned if no match - * is found. - */ -struct super_block *get_super_thawed(struct block_device *bdev) -{ - return __get_super_thawed(bdev, false); -} -EXPORT_SYMBOL(get_super_thawed); - -/** - * get_super_exclusive_thawed - get thawed superblock of a device - * @bdev: device to get the superblock for - * - * Scans the superblock list and finds the superblock of the file system - * mounted on the device. The superblock is returned once it is thawed - * (or immediately if it was not frozen) and s_umount semaphore is held - * in exclusive mode. %NULL is returned if no match is found. - */ -struct super_block *get_super_exclusive_thawed(struct block_device *bdev) -{ - return __get_super_thawed(bdev, true); -} -EXPORT_SYMBOL(get_super_exclusive_thawed); - /** * get_active_super - get an active reference to the superblock of a device * @bdev: device to get the superblock for diff --git a/include/linux/fs.h b/include/linux/fs.h index 8667d0cdc71e76..a61df0dd4f1989 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -1409,7 +1409,7 @@ enum { struct sb_writers { int frozen; /* Is sb frozen? */ - wait_queue_head_t wait_unfrozen; /* for get_super_thawed() */ + wait_queue_head_t wait_unfrozen; /* wait for thaw */ struct percpu_rw_semaphore rw_sem[SB_FREEZE_LEVELS]; }; @@ -3132,8 +3132,6 @@ extern struct file_system_type *get_filesystem(struct file_system_type *fs); extern void put_filesystem(struct file_system_type *fs); extern struct file_system_type *get_fs_type(const char *name); extern struct super_block *get_super(struct block_device *); -extern struct super_block *get_super_thawed(struct block_device *); -extern struct super_block *get_super_exclusive_thawed(struct block_device *bdev); extern struct super_block *get_active_super(struct block_device *bdev); extern void drop_super(struct super_block *sb); extern void drop_super_exclusive(struct super_block *sb); From patchwork Thu Nov 26 13:03:42 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11933499 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 908F0C8300F for ; Thu, 26 Nov 2020 13:07:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 346FC21D7E for ; Thu, 26 Nov 2020 13:07:00 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="Z0715/7u" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389878AbgKZNGy (ORCPT ); Thu, 26 Nov 2020 08:06:54 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53022 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389873AbgKZNGx (ORCPT ); Thu, 26 Nov 2020 08:06:53 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 29E8EC0613D4; Thu, 26 Nov 2020 05:06:53 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=gQdOPzKEPoMlG0wM+OfjM4cY+lCRE6XJdck/PykRaKw=; b=Z0715/7u6zma/RuuCyRuHEDPOL 36iyGS8jlTooDlCHctGm34Tb2dYPcaZuWZqHo+fHTVpRb6CpcL9Gru5m7nU6osOgULWw3cPAriWJ7 8HYuyfTNbkA9MGfo0eZHuOgq2sbA8PaWDUCTrKmpcK5LxWJUSqGWR+tCxHzqt04LeafqY9lP66zy3 jEYEQIRuRQCAb8832dQAZEb403mc8GTPLr3gPgMLkEmPJ8T55eb0C0g7DzK4dXlVvw63yVw9ODWSc ZnVczEGBlTUg5DPjsbS7hC6fdYgljMmfr8aUHIrhOXGEHjxsx/V6Qk/7qx1mT5s1/xv43IgiF20RZ 8kUdQfeg==; Received: from [2001:4bb8:18c:1dd6:27b8:b8a1:c13e:ceb1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGyt-0003wZ-Sr; Thu, 26 Nov 2020 13:06:40 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , dm-devel@redhat.com, Jan Kara , linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, Chao Yu Subject: [PATCH 04/44] fs: simplify freeze_bdev/thaw_bdev Date: Thu, 26 Nov 2020 14:03:42 +0100 Message-Id: <20201126130422.92945-5-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201126130422.92945-1-hch@lst.de> References: <20201126130422.92945-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Store the frozen superblock in struct block_device to avoid the awkward interface that can return a sb only used a cookie, an ERR_PTR or NULL. Signed-off-by: Christoph Hellwig Acked-by: Chao Yu [f2fs] Reviewed-by: Jan Kara --- drivers/md/dm-core.h | 5 ----- drivers/md/dm.c | 20 ++++++-------------- fs/block_dev.c | 37 +++++++++++++++---------------------- fs/buffer.c | 2 +- fs/ext4/ioctl.c | 2 +- fs/f2fs/file.c | 14 +++++--------- fs/xfs/xfs_fsops.c | 7 ++----- include/linux/blk_types.h | 1 + include/linux/blkdev.h | 4 ++-- 9 files changed, 33 insertions(+), 59 deletions(-) diff --git a/drivers/md/dm-core.h b/drivers/md/dm-core.h index d522093cb39dda..aace147effcacb 100644 --- a/drivers/md/dm-core.h +++ b/drivers/md/dm-core.h @@ -96,11 +96,6 @@ struct mapped_device { */ struct workqueue_struct *wq; - /* - * freeze/thaw support require holding onto a super block - */ - struct super_block *frozen_sb; - /* forced geometry settings */ struct hd_geometry geometry; diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 54739f1b579bc8..50541d336c719b 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -2392,27 +2392,19 @@ static int lock_fs(struct mapped_device *md) { int r; - WARN_ON(md->frozen_sb); + WARN_ON(test_bit(DMF_FROZEN, &md->flags)); - md->frozen_sb = freeze_bdev(md->bdev); - if (IS_ERR(md->frozen_sb)) { - r = PTR_ERR(md->frozen_sb); - md->frozen_sb = NULL; - return r; - } - - set_bit(DMF_FROZEN, &md->flags); - - return 0; + r = freeze_bdev(md->bdev); + if (!r) + set_bit(DMF_FROZEN, &md->flags); + return r; } static void unlock_fs(struct mapped_device *md) { if (!test_bit(DMF_FROZEN, &md->flags)) return; - - thaw_bdev(md->bdev, md->frozen_sb); - md->frozen_sb = NULL; + thaw_bdev(md->bdev); clear_bit(DMF_FROZEN, &md->flags); } diff --git a/fs/block_dev.c b/fs/block_dev.c index d8664f5c1ff669..33c29106c98907 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -548,55 +548,47 @@ EXPORT_SYMBOL(fsync_bdev); * count down in thaw_bdev(). When it becomes 0, thaw_bdev() will unfreeze * actually. */ -struct super_block *freeze_bdev(struct block_device *bdev) +int freeze_bdev(struct block_device *bdev) { struct super_block *sb; int error = 0; mutex_lock(&bdev->bd_fsfreeze_mutex); - if (++bdev->bd_fsfreeze_count > 1) { - /* - * We don't even need to grab a reference - the first call - * to freeze_bdev grab an active reference and only the last - * thaw_bdev drops it. - */ - sb = get_super(bdev); - if (sb) - drop_super(sb); - mutex_unlock(&bdev->bd_fsfreeze_mutex); - return sb; - } + if (++bdev->bd_fsfreeze_count > 1) + goto done; sb = get_active_super(bdev); if (!sb) - goto out; + goto sync; if (sb->s_op->freeze_super) error = sb->s_op->freeze_super(sb); else error = freeze_super(sb); + deactivate_super(sb); + if (error) { - deactivate_super(sb); bdev->bd_fsfreeze_count--; - mutex_unlock(&bdev->bd_fsfreeze_mutex); - return ERR_PTR(error); + goto done; } - deactivate_super(sb); - out: + bdev->bd_fsfreeze_sb = sb; + +sync: sync_blockdev(bdev); +done: mutex_unlock(&bdev->bd_fsfreeze_mutex); - return sb; /* thaw_bdev releases s->s_umount */ + return error; } EXPORT_SYMBOL(freeze_bdev); /** * thaw_bdev -- unlock filesystem * @bdev: blockdevice to unlock - * @sb: associated superblock * * Unlocks the filesystem and marks it writeable again after freeze_bdev(). */ -int thaw_bdev(struct block_device *bdev, struct super_block *sb) +int thaw_bdev(struct block_device *bdev) { + struct super_block *sb; int error = -EINVAL; mutex_lock(&bdev->bd_fsfreeze_mutex); @@ -607,6 +599,7 @@ int thaw_bdev(struct block_device *bdev, struct super_block *sb) if (--bdev->bd_fsfreeze_count > 0) goto out; + sb = bdev->bd_fsfreeze_sb; if (!sb) goto out; diff --git a/fs/buffer.c b/fs/buffer.c index 23f645657488ba..a7595ada9400ff 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -523,7 +523,7 @@ static int osync_buffers_list(spinlock_t *lock, struct list_head *list) void emergency_thaw_bdev(struct super_block *sb) { - while (sb->s_bdev && !thaw_bdev(sb->s_bdev, sb)) + while (sb->s_bdev && !thaw_bdev(sb->s_bdev)) printk(KERN_WARNING "Emergency Thaw on %pg\n", sb->s_bdev); } diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c index f0381876a7e5b0..524e134324475e 100644 --- a/fs/ext4/ioctl.c +++ b/fs/ext4/ioctl.c @@ -624,7 +624,7 @@ static int ext4_shutdown(struct super_block *sb, unsigned long arg) case EXT4_GOING_FLAGS_DEFAULT: freeze_bdev(sb->s_bdev); set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags); - thaw_bdev(sb->s_bdev, sb); + thaw_bdev(sb->s_bdev); break; case EXT4_GOING_FLAGS_LOGFLUSH: set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags); diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index ee861c6d9ff026..a9fc482a0e60a5 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -2230,16 +2230,12 @@ static int f2fs_ioc_shutdown(struct file *filp, unsigned long arg) switch (in) { case F2FS_GOING_DOWN_FULLSYNC: - sb = freeze_bdev(sb->s_bdev); - if (IS_ERR(sb)) { - ret = PTR_ERR(sb); + ret = freeze_bdev(sb->s_bdev); + if (ret) goto out; - } - if (sb) { - f2fs_stop_checkpoint(sbi, false); - set_sbi_flag(sbi, SBI_IS_SHUTDOWN); - thaw_bdev(sb->s_bdev, sb); - } + f2fs_stop_checkpoint(sbi, false); + set_sbi_flag(sbi, SBI_IS_SHUTDOWN); + thaw_bdev(sb->s_bdev); break; case F2FS_GOING_DOWN_METASYNC: /* do checkpoint only */ diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c index ef1d5bb88b93ab..b7c5783a031c69 100644 --- a/fs/xfs/xfs_fsops.c +++ b/fs/xfs/xfs_fsops.c @@ -433,13 +433,10 @@ xfs_fs_goingdown( { switch (inflags) { case XFS_FSOP_GOING_FLAGS_DEFAULT: { - struct super_block *sb = freeze_bdev(mp->m_super->s_bdev); - - if (sb && !IS_ERR(sb)) { + if (!freeze_bdev(mp->m_super->s_bdev)) { xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT); - thaw_bdev(sb->s_bdev, sb); + thaw_bdev(mp->m_super->s_bdev); } - break; } case XFS_FSOP_GOING_FLAGS_LOGFLUSH: diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h index d9b69bbde5cc54..ebfb4e7c1fd125 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -46,6 +46,7 @@ struct block_device { int bd_fsfreeze_count; /* Mutex for freeze */ struct mutex bd_fsfreeze_mutex; + struct super_block *bd_fsfreeze_sb; } __randomize_layout; /* diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 05b346a68c2eee..12810a19edebc4 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -2020,7 +2020,7 @@ static inline int sync_blockdev(struct block_device *bdev) #endif int fsync_bdev(struct block_device *bdev); -struct super_block *freeze_bdev(struct block_device *bdev); -int thaw_bdev(struct block_device *bdev, struct super_block *sb); +int freeze_bdev(struct block_device *bdev); +int thaw_bdev(struct block_device *bdev); #endif /* _LINUX_BLKDEV_H */ From patchwork Thu Nov 26 13:03:43 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11933547 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3129FC83025 for ; Thu, 26 Nov 2020 13:07:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C9B3321D7E for ; Thu, 26 Nov 2020 13:07:06 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="uN61mQej" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389881AbgKZNG4 (ORCPT ); Thu, 26 Nov 2020 08:06:56 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53024 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389877AbgKZNGx (ORCPT ); Thu, 26 Nov 2020 08:06:53 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5E517C0617A7; Thu, 26 Nov 2020 05:06:53 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=+3Kb0CPHjQKc56gAmIDHWkQuyu6q4iSqt8pD+2xghiw=; b=uN61mQejGeXhV5FPb/d19U9Y+u 9E3n3bnvILuXyqNkw0ApTVh1F6eBkqYWzyj9E8SBSFzqzBseWKO18KNgZaLVGeJfPJVXXVadSdiFs DaE8MWHXtxnV4eqtuEGudkSzVR0AaSDdvx3drCaFQrMVvRnTrmBKNDD305FuxMlujTGdjwVmg+qmx VJ4zoA80XvSM8tD9XTcWP2rCsGS9ijD/1+QuAEcKpGK80Kp1/k4RtDMCfBTfCmnBda4BNczBb06qo q2uJXC+OeS9L1MVBcd8mnPQwr3qRcdeQE1Hf0g0CQZQrnU5dEENmkbH+yYp8ls2p6ggd0vflpriKY 45hPEOJw==; Received: from [2001:4bb8:18c:1dd6:27b8:b8a1:c13e:ceb1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGyv-0003wd-3V; Thu, 26 Nov 2020 13:06:41 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , dm-devel@redhat.com, Jan Kara , linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 05/44] mtip32xx: remove the call to fsync_bdev on removal Date: Thu, 26 Nov 2020 14:03:43 +0100 Message-Id: <20201126130422.92945-6-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201126130422.92945-1-hch@lst.de> References: <20201126130422.92945-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org del_gendisk already calls fsync_bdev for every partition, no need to do this twice. Signed-off-by: Christoph Hellwig Reviewed-by: Jan Kara --- drivers/block/mtip32xx/mtip32xx.c | 15 --------------- drivers/block/mtip32xx/mtip32xx.h | 2 -- 2 files changed, 17 deletions(-) diff --git a/drivers/block/mtip32xx/mtip32xx.c b/drivers/block/mtip32xx/mtip32xx.c index 153e2cdecb4d40..53ac59d19ae530 100644 --- a/drivers/block/mtip32xx/mtip32xx.c +++ b/drivers/block/mtip32xx/mtip32xx.c @@ -3687,7 +3687,6 @@ static int mtip_block_initialize(struct driver_data *dd) /* Enable the block device and add it to /dev */ device_add_disk(&dd->pdev->dev, dd->disk, NULL); - dd->bdev = bdget_disk(dd->disk, 0); /* * Now that the disk is active, initialize any sysfs attributes * managed by the protocol layer. @@ -3721,9 +3720,6 @@ static int mtip_block_initialize(struct driver_data *dd) return rv; kthread_run_error: - bdput(dd->bdev); - dd->bdev = NULL; - /* Delete our gendisk. This also removes the device from /dev */ del_gendisk(dd->disk); @@ -3804,14 +3800,6 @@ static int mtip_block_remove(struct driver_data *dd) blk_mq_tagset_busy_iter(&dd->tags, mtip_no_dev_cleanup, dd); blk_mq_unquiesce_queue(dd->queue); - /* - * Delete our gendisk structure. This also removes the device - * from /dev - */ - if (dd->bdev) { - bdput(dd->bdev); - dd->bdev = NULL; - } if (dd->disk) { if (test_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag)) del_gendisk(dd->disk); @@ -4206,9 +4194,6 @@ static void mtip_pci_remove(struct pci_dev *pdev) } while (atomic_read(&dd->irq_workers_active) != 0 && time_before(jiffies, to)); - if (!dd->sr) - fsync_bdev(dd->bdev); - if (atomic_read(&dd->irq_workers_active) != 0) { dev_warn(&dd->pdev->dev, "Completion workers still active!\n"); diff --git a/drivers/block/mtip32xx/mtip32xx.h b/drivers/block/mtip32xx/mtip32xx.h index e22a7f0523bf30..88f4206310e4c8 100644 --- a/drivers/block/mtip32xx/mtip32xx.h +++ b/drivers/block/mtip32xx/mtip32xx.h @@ -463,8 +463,6 @@ struct driver_data { int isr_binding; - struct block_device *bdev; - struct list_head online_list; /* linkage for online list */ struct list_head remove_list; /* linkage for removing list */ From patchwork Thu Nov 26 13:03:44 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11933519 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 311AAC71156 for ; Thu, 26 Nov 2020 13:06:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DA9FA21D46 for ; Thu, 26 Nov 2020 13:06:58 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="f/NqtmWw" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389871AbgKZNGx (ORCPT ); Thu, 26 Nov 2020 08:06:53 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53016 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389842AbgKZNGw (ORCPT ); Thu, 26 Nov 2020 08:06:52 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 11E90C0613D4; Thu, 26 Nov 2020 05:06:52 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=aX/8uJuUHGL/5OzvkMliljHbjWPWg1zNhllSpoE70RI=; b=f/NqtmWwXz+in+xDMmB5RLjv8a cVt4qBnc4YL+TtpGupRWfcpXZ/6CMSupd9Lm6rDcG1f45gWluVGZPaAXmikFmFovKMbyRSkP3ZBT+ hc6sbcvaUgr/SQB4V48gh+284LgxPRXzht7xX5qdbG0JHflMTnkExFap8GLHZ+7al6WBvVO+ZIGXU yuV9QZKfTfoVvNAS/JM0osWswLlacLPKcjLjBgIVxwI8KvhfrAKHYZ9mvupyLktTioMa2ASs/VYxH bMQUA75QBjhD4AyShZxBO5EeAFqyZ7Z5prC6cKkcC7lpED8A7ZOTzw8QU7NMhM4j/01Ns3IuFxx42 Fx9txkcg==; Received: from [2001:4bb8:18c:1dd6:27b8:b8a1:c13e:ceb1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGyw-0003xL-Ej; Thu, 26 Nov 2020 13:06:42 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , dm-devel@redhat.com, Jan Kara , linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, Minchan Kim Subject: [PATCH 06/44] zram: do not call set_blocksize Date: Thu, 26 Nov 2020 14:03:44 +0100 Message-Id: <20201126130422.92945-7-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201126130422.92945-1-hch@lst.de> References: <20201126130422.92945-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org set_blocksize is used by file systems to use their preferred buffer cache block size. Block drivers should not set it. Signed-off-by: Christoph Hellwig Acked-by: Minchan Kim --- drivers/block/zram/zram_drv.c | 11 +---------- drivers/block/zram/zram_drv.h | 1 - 2 files changed, 1 insertion(+), 11 deletions(-) diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c index 6d15d51cee2b7e..b5f68951c9d280 100644 --- a/drivers/block/zram/zram_drv.c +++ b/drivers/block/zram/zram_drv.c @@ -403,13 +403,10 @@ static void reset_bdev(struct zram *zram) return; bdev = zram->bdev; - if (zram->old_block_size) - set_blocksize(bdev, zram->old_block_size); blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); /* hope filp_close flush all of IO */ filp_close(zram->backing_dev, NULL); zram->backing_dev = NULL; - zram->old_block_size = 0; zram->bdev = NULL; zram->disk->fops = &zram_devops; kvfree(zram->bitmap); @@ -454,7 +451,7 @@ static ssize_t backing_dev_store(struct device *dev, struct file *backing_dev = NULL; struct inode *inode; struct address_space *mapping; - unsigned int bitmap_sz, old_block_size = 0; + unsigned int bitmap_sz; unsigned long nr_pages, *bitmap = NULL; struct block_device *bdev = NULL; int err; @@ -509,14 +506,8 @@ static ssize_t backing_dev_store(struct device *dev, goto out; } - old_block_size = block_size(bdev); - err = set_blocksize(bdev, PAGE_SIZE); - if (err) - goto out; - reset_bdev(zram); - zram->old_block_size = old_block_size; zram->bdev = bdev; zram->backing_dev = backing_dev; zram->bitmap = bitmap; diff --git a/drivers/block/zram/zram_drv.h b/drivers/block/zram/zram_drv.h index f2fd46daa76045..712354a4207c77 100644 --- a/drivers/block/zram/zram_drv.h +++ b/drivers/block/zram/zram_drv.h @@ -118,7 +118,6 @@ struct zram { bool wb_limit_enable; u64 bd_wb_limit; struct block_device *bdev; - unsigned int old_block_size; unsigned long *bitmap; unsigned long nr_pages; #endif From patchwork Thu Nov 26 13:03:45 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11933555 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2562BC83013 for ; Thu, 26 Nov 2020 13:07:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C20A3221F7 for ; Thu, 26 Nov 2020 13:07:01 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="SSIkA7Jw" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389888AbgKZNG5 (ORCPT ); Thu, 26 Nov 2020 08:06:57 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53030 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389873AbgKZNGz (ORCPT ); Thu, 26 Nov 2020 08:06:55 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C560BC0613D4; Thu, 26 Nov 2020 05:06:54 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=2uWDeQgsBeIc9r8ohTt9OrV40AdHP0SZhV+7+E52opA=; b=SSIkA7Jwmun7vSHnczcicqQ4lG UjMHkibDFctJGfKeI+vQ0holL/u1HaWSuDuUihk5P2PDzonczmJk9wc3uFgr08cwFB57TNrT5oSP2 vcMucs3y60oVdjbj5A/QqIpqAFHb0lsbNyDfWwlEyWA0uxExQ5pG2BYzjikkA14ePil5HCAQBUngw PVVOxQoUwVmzWGWbLURnW2+g9R0Ih8SgiafAlJG5rFu9FGUQ35fmjsQD9qua5gsQHSc0/Gx1M5N24 nVtvyEhO0E85s8yafzS/yk4a2pKqEf++6ErXd3aZ07xWvHw5cEy0shRdaxolyN7YW1u7oD5/9XBQI IU8K1rqw==; Received: from [2001:4bb8:18c:1dd6:27b8:b8a1:c13e:ceb1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGyx-0003xi-ML; Thu, 26 Nov 2020 13:06:44 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , dm-devel@redhat.com, Jan Kara , linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 07/44] loop: do not call set_blocksize Date: Thu, 26 Nov 2020 14:03:45 +0100 Message-Id: <20201126130422.92945-8-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201126130422.92945-1-hch@lst.de> References: <20201126130422.92945-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org set_blocksize is used by file systems to use their preferred buffer cache block size. Block drivers should not set it. Signed-off-by: Christoph Hellwig Reviewed-by: Jan Kara --- drivers/block/loop.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/drivers/block/loop.c b/drivers/block/loop.c index 9a27d4f1c08aac..b42c728620c9e4 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -1164,9 +1164,6 @@ static int loop_configure(struct loop_device *lo, fmode_t mode, size = get_loop_size(lo, file); loop_set_size(lo, size); - set_blocksize(bdev, S_ISBLK(inode->i_mode) ? - block_size(inode->i_bdev) : PAGE_SIZE); - lo->lo_state = Lo_bound; if (part_shift) lo->lo_flags |= LO_FLAGS_PARTSCAN; From patchwork Thu Nov 26 13:03:46 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11933507 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 63A66C83018 for ; Thu, 26 Nov 2020 13:07:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2E70421D46 for ; Thu, 26 Nov 2020 13:07:03 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="frQf5+o7" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389896AbgKZNG6 (ORCPT ); Thu, 26 Nov 2020 08:06:58 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53034 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389877AbgKZNG4 (ORCPT ); Thu, 26 Nov 2020 08:06:56 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6B117C0613D4; Thu, 26 Nov 2020 05:06:56 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=qOmzpRMb4vEzGwba4P3m5gENBKcm1ZKj8N5Pylgvbms=; b=frQf5+o7/NEEwvyZN+t2Km5Ptl NbZc0zYkcrH+IirsiacpBTVbLlfEA1hzVC3a1JMUpYfnRBaxbcnseEGspGlij5gGLt/b1dXtWHRnW j7Nwk+zMr1rHM001tS7jauuj3xz4Ff7g5hqe72Jm8GhyTteC9Epan9fy6PzkAQHF3YoAGeCsN0JEb Vrp/UQrhUUKz3ZV4E1mpp5iyaIB3UfSxRhD9jTjfaSnJ+dPweTGrMJUxgZ7eV3Ksy18x0da98PCml 3Wc0i0cpZBIwV780R1d+Ru6O+O+5N8Q0luFoj6zjTKcB+1kxHPewVhpv7sGiBRxlZBhTNS/mwFo0W vCkZ+Qkw==; Received: from [2001:4bb8:18c:1dd6:27b8:b8a1:c13e:ceb1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGyy-0003xt-Re; Thu, 26 Nov 2020 13:06:45 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , dm-devel@redhat.com, Jan Kara , linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 08/44] dm: simplify flush_bio initialization in __send_empty_flush Date: Thu, 26 Nov 2020 14:03:46 +0100 Message-Id: <20201126130422.92945-9-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201126130422.92945-1-hch@lst.de> References: <20201126130422.92945-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org We don't really need the struct block_device to initialize a bio. So switch from using bio_set_dev to manually setting up bi_disk (bi_partno will always be zero and has been cleared by bio_init already). Signed-off-by: Christoph Hellwig Acked-by: Mike Snitzer --- drivers/md/dm.c | 12 +++--------- 1 file changed, 3 insertions(+), 9 deletions(-) diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 50541d336c719b..ab0a8335f098d9 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -1422,18 +1422,12 @@ static int __send_empty_flush(struct clone_info *ci) */ bio_init(&flush_bio, NULL, 0); flush_bio.bi_opf = REQ_OP_WRITE | REQ_PREFLUSH | REQ_SYNC; + flush_bio.bi_disk = ci->io->md->disk; + bio_associate_blkg(&flush_bio); + ci->bio = &flush_bio; ci->sector_count = 0; - /* - * Empty flush uses a statically initialized bio, as the base for - * cloning. However, blkg association requires that a bdev is - * associated with a gendisk, which doesn't happen until the bdev is - * opened. So, blkg association is done at issue time of the flush - * rather than when the device is created in alloc_dev(). - */ - bio_set_dev(ci->bio, ci->io->md->bdev); - BUG_ON(bio_has_data(ci->bio)); while ((ti = dm_table_get_target(ci->map, target_nr++))) __send_duplicate_bios(ci, ti, ti->num_flush_bios, NULL); From patchwork Thu Nov 26 13:03:47 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11933501 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id AFD0EC8301A for ; Thu, 26 Nov 2020 13:07:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 61BB521D7E for ; Thu, 26 Nov 2020 13:07:03 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="WipNHSiT" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389877AbgKZNG7 (ORCPT ); Thu, 26 Nov 2020 08:06:59 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53042 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388748AbgKZNG5 (ORCPT ); Thu, 26 Nov 2020 08:06:57 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9CE7FC0613D4; Thu, 26 Nov 2020 05:06:57 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=qLuO7hD0TG0p9aylN+kHqBJxf5z3v4FVxxZ2M17hRmY=; b=WipNHSiTxaCf/i02olOf7S3b9k 7tumqyBklwAOPoXqVFvK7+2BEqr7y+sx5mtON0mAzzW3MNkz4zrs+oOdvLTnVFxaaiMonNJfLIy8Q mg8VT4WS4Ip5pd4gfxLpdNLWZoV6OX52On+8eE2jJEIcq7Cp7fEZVK3+QcKPIzI836DMs1oSmZ5mn CI/Pdisi9YSbIPpv0OjyO44mtEppEv4VK/NnydCG5MxTm7rW/g9HPg4FdYgn79eOrdDjUnC2veigu rt+xk0G2+KPdni2kRxB8tq3rtjl7wPFlb2kyTIaT/RrtRyhEAMkAYShxe7iJog3pPC+knYv7531E4 QzH7l/gQ==; Received: from [2001:4bb8:18c:1dd6:27b8:b8a1:c13e:ceb1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGyz-0003y8-VM; Thu, 26 Nov 2020 13:06:46 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , dm-devel@redhat.com, Jan Kara , linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 09/44] dm: remove the block_device reference in struct mapped_device Date: Thu, 26 Nov 2020 14:03:47 +0100 Message-Id: <20201126130422.92945-10-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201126130422.92945-1-hch@lst.de> References: <20201126130422.92945-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Get rid of the long-lasting struct block_device reference in struct mapped_device. The only remaining user is the freeze code, where we can trivially look up the block device at freeze time and release the reference at thaw time. Signed-off-by: Christoph Hellwig Acked-by: Mike Snitzer Reviewed-by: Hannes Reinecke --- drivers/md/dm-core.h | 2 -- drivers/md/dm.c | 25 ++++++++++++++----------- 2 files changed, 14 insertions(+), 13 deletions(-) diff --git a/drivers/md/dm-core.h b/drivers/md/dm-core.h index aace147effcacb..086d293c2b036c 100644 --- a/drivers/md/dm-core.h +++ b/drivers/md/dm-core.h @@ -102,8 +102,6 @@ struct mapped_device { /* kobject and completion */ struct dm_kobject_holder kobj_holder; - struct block_device *bdev; - struct dm_stats stats; /* for blk-mq request-based DM support */ diff --git a/drivers/md/dm.c b/drivers/md/dm.c index ab0a8335f098d9..48051db006f30c 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -1744,11 +1744,6 @@ static void cleanup_mapped_device(struct mapped_device *md) cleanup_srcu_struct(&md->io_barrier); - if (md->bdev) { - bdput(md->bdev); - md->bdev = NULL; - } - mutex_destroy(&md->suspend_lock); mutex_destroy(&md->type_lock); mutex_destroy(&md->table_devices_lock); @@ -1840,10 +1835,6 @@ static struct mapped_device *alloc_dev(int minor) if (!md->wq) goto bad; - md->bdev = bdget_disk(md->disk, 0); - if (!md->bdev) - goto bad; - dm_stats_init(&md->stats); /* Populate the mapping, nobody knows we exist yet */ @@ -2384,11 +2375,16 @@ struct dm_table *dm_swap_table(struct mapped_device *md, struct dm_table *table) */ static int lock_fs(struct mapped_device *md) { + struct block_device *bdev; int r; WARN_ON(test_bit(DMF_FROZEN, &md->flags)); - r = freeze_bdev(md->bdev); + bdev = bdget_disk(md->disk, 0); + if (!bdev) + return -ENOMEM; + r = freeze_bdev(bdev); + bdput(bdev); if (!r) set_bit(DMF_FROZEN, &md->flags); return r; @@ -2396,9 +2392,16 @@ static int lock_fs(struct mapped_device *md) static void unlock_fs(struct mapped_device *md) { + struct block_device *bdev; + if (!test_bit(DMF_FROZEN, &md->flags)) return; - thaw_bdev(md->bdev); + + bdev = bdget_disk(md->disk, 0); + if (!bdev) + return; + thaw_bdev(bdev); + bdput(bdev); clear_bit(DMF_FROZEN, &md->flags); } From patchwork Thu Nov 26 13:03:48 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11933505 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A9C76C8300B for ; 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bh=1+4fu59prkKRojykQDqvT3W9Bijlh50O/kXwJOb/aME=; b=ZWV6LH7GEdGqHLvLjkur8QuLUx 6DTPcwjuwJwmTtqZBu17E9jYrMVvxknLW/h+G1f1+n7ZI3yB9ZIeIDK3oJkM2YeI7jAGd6/2dQ+EN o2hfHA9TQoFx8zvOjztvNVjPx8GWsFxbIJ2lME0gDljvC6aMUkmfZkzZ2SzYY0POT+9s5Jca+rlHS TEqycrmW8t5TROrwUU1cPNQzGaOHm+WRr+1fhUPIPUd9mr1Su4PKLUCx3jKFiq1zOUOsViqGD1OEm Ldun6cMM/WOhBDyiLooximthVpA4fFxT3jvk9QO7EJKAzSi5eeqgmzN1UBtCj90T8twk1411PaHhx naQFEDJg==; Received: from [2001:4bb8:18c:1dd6:27b8:b8a1:c13e:ceb1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGz1-0003yN-95; Thu, 26 Nov 2020 13:06:47 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , dm-devel@redhat.com, Jan Kara , linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 10/44] block: remove a duplicate __disk_get_part prototype Date: Thu, 26 Nov 2020 14:03:48 +0100 Message-Id: <20201126130422.92945-11-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201126130422.92945-1-hch@lst.de> References: <20201126130422.92945-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Signed-off-by: Christoph Hellwig Acked-by: Tejun Heo Reviewed-by: Jan Kara Reviewed-by: Greg Kroah-Hartman Reviewed-by: Johannes Thumshirn Reviewed-by: Hannes Reinecke --- include/linux/genhd.h | 1 - 1 file changed, 1 deletion(-) diff --git a/include/linux/genhd.h b/include/linux/genhd.h index 46553d6d602563..22f5b9fd96f8bf 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -250,7 +250,6 @@ static inline dev_t part_devt(struct hd_struct *part) return part_to_dev(part)->devt; } -extern struct hd_struct *__disk_get_part(struct gendisk *disk, int partno); extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno); static inline void disk_put_part(struct hd_struct *part) From patchwork Thu Nov 26 13:03:49 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11933511 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 25B8DC8301B for ; Thu, 26 Nov 2020 13:07:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DA51421D7E for ; Thu, 26 Nov 2020 13:07:03 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="fCfJvwHP" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389903AbgKZNHA (ORCPT ); Thu, 26 Nov 2020 08:07:00 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53048 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389898AbgKZNG7 (ORCPT ); Thu, 26 Nov 2020 08:06:59 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 13AE0C0613D4; Thu, 26 Nov 2020 05:06:59 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=hkZ3kL3dtIfOBE0h3NJSBhFvBELjgr4IDAohskoKJQM=; b=fCfJvwHPUDDStYbe0VsGaec1in U0zKXdrWOqg/L2l/BL9qX6NQaal1L3Uusa/6q1hmk1oWjZ7IMFo7XofMZStGwr7WznBF9TBW+s0OS 6CulGjI2XcLUdygOsMow8BLNKQCEqU6hm8dk4yrnVZAn4AAjTF/Snw6eK0jhrsfgXJecL9mltL6ki HdYSZLmZaP7ZQ/fA+wo0Uxx0lBvV4iB5Vh9MgcX5/zRausT/1kLE18oDuA4RAkqJRcT1bDJHXNCm5 kY7YN0If2gfe4bIItZVrOhw7oqhpXep1bWKV6SsURJ6x4g+QA/OnAEiRvbBTj4jOWagKSP+h389TD DgmdR6Ag==; Received: from [2001:4bb8:18c:1dd6:27b8:b8a1:c13e:ceb1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGz2-0003z9-Fv; Thu, 26 Nov 2020 13:06:48 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , dm-devel@redhat.com, Jan Kara , linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 11/44] block: remove a superflous check in blkpg_do_ioctl Date: Thu, 26 Nov 2020 14:03:49 +0100 Message-Id: <20201126130422.92945-12-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201126130422.92945-1-hch@lst.de> References: <20201126130422.92945-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org sector_t is now always a u64, so this check is not needed. Signed-off-by: Christoph Hellwig Acked-by: Tejun Heo Reviewed-by: Jan Kara Reviewed-by: Hannes Reinecke --- block/ioctl.c | 9 --------- 1 file changed, 9 deletions(-) diff --git a/block/ioctl.c b/block/ioctl.c index 6b785181344fe1..0c09bb7a6ff35f 100644 --- a/block/ioctl.c +++ b/block/ioctl.c @@ -35,15 +35,6 @@ static int blkpg_do_ioctl(struct block_device *bdev, start = p.start >> SECTOR_SHIFT; length = p.length >> SECTOR_SHIFT; - /* check for fit in a hd_struct */ - if (sizeof(sector_t) < sizeof(long long)) { - long pstart = start, plength = length; - - if (pstart != start || plength != length || pstart < 0 || - plength < 0 || p.pno > 65535) - return -EINVAL; - } - switch (op) { case BLKPG_ADD_PARTITION: /* check if partition is aligned to blocksize */ From patchwork Thu Nov 26 13:03:50 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11933509 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C3994C63777 for ; Thu, 26 Nov 2020 13:07:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6B4DA21D7E for ; Thu, 26 Nov 2020 13:07:04 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="kTeBBPXT" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389905AbgKZNHA (ORCPT ); Thu, 26 Nov 2020 08:07:00 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53052 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389900AbgKZNHA (ORCPT ); Thu, 26 Nov 2020 08:07:00 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 05286C0613D4; Thu, 26 Nov 2020 05:07:00 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=TyzqnxJJ0lPyhYWk7Q6Y2rXryMj44xbGM+SIZQYkZvc=; b=kTeBBPXTZGDQlqvWXi1ub7lmvK cpnK08gWLXcWbBPPdmkRvLMxHdqyIGOqpWCQb5BjlbvAcY6waRjucuwF4EbPBG7PVYT8grRUIiy1I fRAKYhasJriE+kayDsRRwhhmS9JHgMY4jzN3q2QtYJh7eowAxjzyt6GZ+uqeAJoSrPo/M4Y/2G0Rq 2AeJ6qfmzuWSmewSR31lCCoXK3I4tQvHKtPnxfZPwYX2hoOoyg85yVBAu4gJlqBjdkuYiZkCjfykT 5S+Pyh1/6J6gTrQdbfu2ByGBPLfUPRdCc3a/D5X6Ubl7OXvbluV+9MZBFCnaPBnqGtNXp5j+aW9pi +okagJjg==; Received: from [2001:4bb8:18c:1dd6:27b8:b8a1:c13e:ceb1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGz3-0003zN-SH; Thu, 26 Nov 2020 13:06:50 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , dm-devel@redhat.com, Jan Kara , linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 12/44] block: add a bdev_kobj helper Date: Thu, 26 Nov 2020 14:03:50 +0100 Message-Id: <20201126130422.92945-13-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201126130422.92945-1-hch@lst.de> References: <20201126130422.92945-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Add a little helper to find the kobject for a struct block_device. Signed-off-by: Christoph Hellwig Reviewed-by: Greg Kroah-Hartman Reviewed-by: Jan Kara Reviewed-by: Johannes Thumshirn Acked-by: Tejun Heo Acked-by: Coly Li [bcache] Acked-by: David Sterba Reviewed-by: Hannes Reinecke --- drivers/md/bcache/super.c | 7 ++----- drivers/md/md.c | 4 +--- fs/block_dev.c | 6 +++--- fs/btrfs/sysfs.c | 15 +++------------ include/linux/blk_types.h | 3 +++ 5 files changed, 12 insertions(+), 23 deletions(-) diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c index 46a00134a36ae1..a6a5e21e4fd136 100644 --- a/drivers/md/bcache/super.c +++ b/drivers/md/bcache/super.c @@ -1447,8 +1447,7 @@ static int register_bdev(struct cache_sb *sb, struct cache_sb_disk *sb_disk, goto err; err = "error creating kobject"; - if (kobject_add(&dc->disk.kobj, &part_to_dev(bdev->bd_part)->kobj, - "bcache")) + if (kobject_add(&dc->disk.kobj, bdev_kobj(bdev), "bcache")) goto err; if (bch_cache_accounting_add_kobjs(&dc->accounting, &dc->disk.kobj)) goto err; @@ -2342,9 +2341,7 @@ static int register_cache(struct cache_sb *sb, struct cache_sb_disk *sb_disk, goto err; } - if (kobject_add(&ca->kobj, - &part_to_dev(bdev->bd_part)->kobj, - "bcache")) { + if (kobject_add(&ca->kobj, bdev_kobj(bdev), "bcache")) { err = "error calling kobject_add"; ret = -ENOMEM; goto out; diff --git a/drivers/md/md.c b/drivers/md/md.c index b2edf5e0f965b5..7ce6047c856ea2 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -2414,7 +2414,6 @@ EXPORT_SYMBOL(md_integrity_add_rdev); static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev) { char b[BDEVNAME_SIZE]; - struct kobject *ko; int err; /* prevent duplicates */ @@ -2477,9 +2476,8 @@ static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev) if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) goto fail; - ko = &part_to_dev(rdev->bdev->bd_part)->kobj; /* failure here is OK */ - err = sysfs_create_link(&rdev->kobj, ko, "block"); + err = sysfs_create_link(&rdev->kobj, bdev_kobj(rdev->bdev), "block"); rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state"); rdev->sysfs_unack_badblocks = sysfs_get_dirent_safe(rdev->kobj.sd, "unacknowledged_bad_blocks"); diff --git a/fs/block_dev.c b/fs/block_dev.c index 33c29106c98907..c5755150c6be62 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -1242,7 +1242,7 @@ int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk) holder->disk = disk; holder->refcnt = 1; - ret = add_symlink(disk->slave_dir, &part_to_dev(bdev->bd_part)->kobj); + ret = add_symlink(disk->slave_dir, bdev_kobj(bdev)); if (ret) goto out_free; @@ -1259,7 +1259,7 @@ int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk) goto out_unlock; out_del: - del_symlink(disk->slave_dir, &part_to_dev(bdev->bd_part)->kobj); + del_symlink(disk->slave_dir, bdev_kobj(bdev)); out_free: kfree(holder); out_unlock: @@ -1287,7 +1287,7 @@ void bd_unlink_disk_holder(struct block_device *bdev, struct gendisk *disk) holder = bd_find_holder_disk(bdev, disk); if (!WARN_ON_ONCE(holder == NULL) && !--holder->refcnt) { - del_symlink(disk->slave_dir, &part_to_dev(bdev->bd_part)->kobj); + del_symlink(disk->slave_dir, bdev_kobj(bdev)); del_symlink(bdev->bd_part->holder_dir, &disk_to_dev(disk)->kobj); kobject_put(bdev->bd_part->holder_dir); diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c index 279d9262b676d4..24b6c6dc69000a 100644 --- a/fs/btrfs/sysfs.c +++ b/fs/btrfs/sysfs.c @@ -1232,8 +1232,6 @@ int btrfs_sysfs_add_space_info_type(struct btrfs_fs_info *fs_info, void btrfs_sysfs_remove_device(struct btrfs_device *device) { - struct hd_struct *disk; - struct kobject *disk_kobj; struct kobject *devices_kobj; /* @@ -1243,11 +1241,8 @@ void btrfs_sysfs_remove_device(struct btrfs_device *device) devices_kobj = device->fs_info->fs_devices->devices_kobj; ASSERT(devices_kobj); - if (device->bdev) { - disk = device->bdev->bd_part; - disk_kobj = &part_to_dev(disk)->kobj; - sysfs_remove_link(devices_kobj, disk_kobj->name); - } + if (device->bdev) + sysfs_remove_link(devices_kobj, bdev_kobj(device->bdev)->name); if (device->devid_kobj.state_initialized) { kobject_del(&device->devid_kobj); @@ -1353,11 +1348,7 @@ int btrfs_sysfs_add_device(struct btrfs_device *device) nofs_flag = memalloc_nofs_save(); if (device->bdev) { - struct hd_struct *disk; - struct kobject *disk_kobj; - - disk = device->bdev->bd_part; - disk_kobj = &part_to_dev(disk)->kobj; + struct kobject *disk_kobj = bdev_kobj(device->bdev); ret = sysfs_create_link(devices_kobj, disk_kobj, disk_kobj->name); if (ret) { diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h index ebfb4e7c1fd125..9698f459cc65c9 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -49,6 +49,9 @@ struct block_device { struct super_block *bd_fsfreeze_sb; } __randomize_layout; +#define bdev_kobj(_bdev) \ + (&part_to_dev((_bdev)->bd_part)->kobj) + /* * Block error status values. See block/blk-core:blk_errors for the details. * Alpha cannot write a byte atomically, so we need to use 32-bit value. From patchwork Thu Nov 26 13:03:51 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11933503 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7D571C8301C for ; Thu, 26 Nov 2020 13:07:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2089A21D46 for ; Thu, 26 Nov 2020 13:07:05 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="jDIIQC7J" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389909AbgKZNHC (ORCPT ); Thu, 26 Nov 2020 08:07:02 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53058 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389900AbgKZNHB (ORCPT ); Thu, 26 Nov 2020 08:07:01 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9BE0FC0613D4; Thu, 26 Nov 2020 05:07:01 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=QGxJ1HD+iQwtllhLyJ4Xwx8w1+7WhF9jztK6ZcNRFkk=; b=jDIIQC7Jb1yVnQy4L2lbIMWIJZ bkckbo8WQyWwVDPc+oXpbNS3IMqCar6g729W2G3rceyXGMuytugZEPLpY3E0W+1/C/ydprBZY1Pi4 Avw+fjNfUIXsJrY1Xep71WWWPqeVQso9FdoA6NHhS2z65+CydnqxYdvL2XTMsv8RQx87o9dIt9YOq gRhOyKNn79SNkzIspyPDK9q7PYIVQDXOROMz1lbl+d8g18TGgfKIK4jbzo4ArDcTsez2FmtGtax8t B1bdw31Zt0/8OgVAgLcXcd9stt7E2b7mN719CecQnYMHOHtVE+XiOquYOk/3OHr0STY9A71GKer+M Z/mCFTNA==; Received: from [2001:4bb8:18c:1dd6:27b8:b8a1:c13e:ceb1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGz5-0003zr-C3; Thu, 26 Nov 2020 13:06:52 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , dm-devel@redhat.com, Jan Kara , linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 13/44] block: use disk_part_iter_exit in disk_part_iter_next Date: Thu, 26 Nov 2020 14:03:51 +0100 Message-Id: <20201126130422.92945-14-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201126130422.92945-1-hch@lst.de> References: <20201126130422.92945-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Call disk_part_iter_exit in disk_part_iter_next instead of duplicating the functionality. Signed-off-by: Christoph Hellwig Reviewed-by: Greg Kroah-Hartman Reviewed-by: Jan Kara Reviewed-by: Johannes Thumshirn Acked-by: Tejun Heo Reviewed-by: Hannes Reinecke --- block/genhd.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/block/genhd.c b/block/genhd.c index 4e039524f92b8f..0bd9c41dd4cb69 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -227,8 +227,7 @@ struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter) int inc, end; /* put the last partition */ - disk_put_part(piter->part); - piter->part = NULL; + disk_part_iter_exit(piter); /* get part_tbl */ rcu_read_lock(); From patchwork Thu Nov 26 13:03:52 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11933533 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D23C5C83026 for ; Thu, 26 Nov 2020 13:07:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7D131221F1 for ; Thu, 26 Nov 2020 13:07:07 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="VzUQYe4P" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389910AbgKZNHF (ORCPT ); Thu, 26 Nov 2020 08:07:05 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53070 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389756AbgKZNHF (ORCPT ); Thu, 26 Nov 2020 08:07:05 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2DCC3C0613D4; Thu, 26 Nov 2020 05:07:05 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=cCnViX+7xYhlWEzFMVB617+yZ+N1oSjUspGr9itxVFQ=; b=VzUQYe4PCSUVBLjyrp4E9LCtQJ XWkIY4HP4CkDFngCBsYLu53aQQmNRsKryD/8/xId8wZEza5fOchC/fad7N9a4c+Ha/D9sFEms7488 vkQLzYPfbMTG05cyhFSEunx8YiD3qGcvShoR4Bx52A+/X0uCfLp9LnYvQFHOYY8MIxPs9eFjRpDxD mIW+cwivF+3AuHdm2iQ8pArJ1hwFCl40zEDaCcYrKEAULepbkyCd0rxu6DxVGTXiNb/v7L9hkggQy hkAdpKbQPAaKr0ezNuxpGLVioHZJ2rdtKUOz24YVjFqt2ucmLwf2R95JzwyXHHvyBaNJznmIfXECV ivBrU1cg==; Received: from [2001:4bb8:18c:1dd6:27b8:b8a1:c13e:ceb1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGz7-00040B-5z; Thu, 26 Nov 2020 13:06:53 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , dm-devel@redhat.com, Jan Kara , linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 14/44] block: use put_device in put_disk Date: Thu, 26 Nov 2020 14:03:52 +0100 Message-Id: <20201126130422.92945-15-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201126130422.92945-1-hch@lst.de> References: <20201126130422.92945-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Use put_device to put the device instead of poking into the internals and using kobject_put. Signed-off-by: Christoph Hellwig Reviewed-by: Greg Kroah-Hartman Reviewed-by: Jan Kara Reviewed-by: Johannes Thumshirn Acked-by: Tejun Heo --- block/genhd.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/block/genhd.c b/block/genhd.c index 0bd9c41dd4cb69..f46e89226fdf91 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -1803,7 +1803,7 @@ EXPORT_SYMBOL(__alloc_disk_node); void put_disk(struct gendisk *disk) { if (disk) - kobject_put(&disk_to_dev(disk)->kobj); + put_device(disk_to_dev(disk)); } EXPORT_SYMBOL(put_disk); From patchwork Thu Nov 26 13:03:53 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11933525 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 65277C8300E for ; Thu, 26 Nov 2020 13:07:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0FE18221E9 for ; Thu, 26 Nov 2020 13:07:09 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="NVToo5zU" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389916AbgKZNHH (ORCPT ); Thu, 26 Nov 2020 08:07:07 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53076 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389756AbgKZNHH (ORCPT ); Thu, 26 Nov 2020 08:07:07 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3E75AC0613D4; Thu, 26 Nov 2020 05:07:07 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=SW7QB0PrcKUZMioCTHfjVYRSAQJETlEvEJA7mQw1f90=; b=NVToo5zU1EFnAElnvGaVj64+Rx nW3JxcaS+L7MPu3shf5g1nJc5Ijppk71Op9TuJplM5DJKDp5UB2L9eyDVqcgKMJLAQhE7VwVil29k Jd6YI1q8NsyxKxrsXImlhwM7jb4VZ5CDEcsbuhetZoJ3P1pTD9ux5QphDxyMZri4O2urqFS7vWvcS B2GJrmPRYwydkICtqROCG+yFhr64PFv6ZO6TusbpDN43JuAyxbLS/LLwLTBP8WZuHUo2/v9qtuZ3w wlOQxaBlPsRBUrgYABJ9UCJ7xMIGsZmIqC9FqvTcu+emmm51PWeePdnojUtNLM8o9j+nahMKajOW+ rcfNluMw==; Received: from [2001:4bb8:18c:1dd6:27b8:b8a1:c13e:ceb1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGz8-00040S-Ao; Thu, 26 Nov 2020 13:06:54 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , dm-devel@redhat.com, Jan Kara , linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 15/44] block: change the hash used for looking up block devices Date: Thu, 26 Nov 2020 14:03:53 +0100 Message-Id: <20201126130422.92945-16-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201126130422.92945-1-hch@lst.de> References: <20201126130422.92945-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Adding the minor to the major creates tons of pointless conflicts. Just use the dev_t itself, which is 32-bits and thus is guaranteed to fit into ino_t. Signed-off-by: Christoph Hellwig Reviewed-by: Greg Kroah-Hartman Reviewed-by: Jan Kara Acked-by: Tejun Heo --- fs/block_dev.c | 26 ++------------------------ 1 file changed, 2 insertions(+), 24 deletions(-) diff --git a/fs/block_dev.c b/fs/block_dev.c index c5755150c6be62..d707ab376da86e 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -863,35 +863,12 @@ void __init bdev_cache_init(void) blockdev_superblock = bd_mnt->mnt_sb; /* For writeback */ } -/* - * Most likely _very_ bad one - but then it's hardly critical for small - * /dev and can be fixed when somebody will need really large one. - * Keep in mind that it will be fed through icache hash function too. - */ -static inline unsigned long hash(dev_t dev) -{ - return MAJOR(dev)+MINOR(dev); -} - -static int bdev_test(struct inode *inode, void *data) -{ - return BDEV_I(inode)->bdev.bd_dev == *(dev_t *)data; -} - -static int bdev_set(struct inode *inode, void *data) -{ - BDEV_I(inode)->bdev.bd_dev = *(dev_t *)data; - return 0; -} - static struct block_device *bdget(dev_t dev) { struct block_device *bdev; struct inode *inode; - inode = iget5_locked(blockdev_superblock, hash(dev), - bdev_test, bdev_set, &dev); - + inode = iget_locked(blockdev_superblock, dev); if (!inode) return NULL; @@ -903,6 +880,7 @@ static struct block_device *bdget(dev_t dev) bdev->bd_super = NULL; bdev->bd_inode = inode; bdev->bd_part_count = 0; + bdev->bd_dev = dev; inode->i_mode = S_IFBLK; inode->i_rdev = dev; inode->i_bdev = bdev; From patchwork Thu Nov 26 13:03:54 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11933541 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 96494C83010 for ; Thu, 26 Nov 2020 13:07:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3FC90221E9 for ; Thu, 26 Nov 2020 13:07:10 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="CdbC5hlw" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389923AbgKZNHJ (ORCPT ); Thu, 26 Nov 2020 08:07:09 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53080 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389756AbgKZNHI (ORCPT ); Thu, 26 Nov 2020 08:07:08 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EB1CAC0613D4; Thu, 26 Nov 2020 05:07:07 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=aXV3aDcarMWm87S3K48qh326Jqh2T5iEz0okUiuykIU=; b=CdbC5hlwj31l+0IcsFPnJP1nL1 +kxO6fnofY15Q8oWyZkGLPmr7gioA2In6NDJY5N83HYYS68cvToFcHGWLrMo7DDpM//js2sxCscAV 70J3mUQiLizIOkrp+AWra1+ubkP00mS52zOg4rtxpHO5F2qyOwxNAAq+8RfKOFTNzFchlm1NnwdFy B9vQoYXRi4VrsNweREv2Bi5/AEghh77WnXpyFZqpajHkQOfvk9ozHa05FKD6BAXWpjbiQduV+184Z BnJS0sT1e1hyRM1MlkFl6avl9qflwdCVAnriAgpt09AQLVsFImFuQvsKjpG3KoJpbzehpvTz5cfpc afAK1+Sg==; Received: from [2001:4bb8:18c:1dd6:27b8:b8a1:c13e:ceb1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGz9-00040j-PL; Thu, 26 Nov 2020 13:06:56 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , dm-devel@redhat.com, Jan Kara , linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 16/44] init: refactor name_to_dev_t Date: Thu, 26 Nov 2020 14:03:54 +0100 Message-Id: <20201126130422.92945-17-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201126130422.92945-1-hch@lst.de> References: <20201126130422.92945-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Split each case into a self-contained helper, and move the block dependent code entirely under the pre-existing #ifdef CONFIG_BLOCK. This allows to remove the blk_lookup_devt stub in genhd.h. Signed-off-by: Christoph Hellwig Reviewed-by: Greg Kroah-Hartman Reviewed-by: Jan Kara Reviewed-by: Johannes Thumshirn Acked-by: Tejun Heo --- include/linux/genhd.h | 7 +- init/do_mounts.c | 183 +++++++++++++++++++++--------------------- 2 files changed, 91 insertions(+), 99 deletions(-) diff --git a/include/linux/genhd.h b/include/linux/genhd.h index 22f5b9fd96f8bf..ca5e356084c353 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -388,18 +388,13 @@ static inline void bd_unlink_disk_holder(struct block_device *bdev, } #endif /* CONFIG_SYSFS */ +dev_t blk_lookup_devt(const char *name, int partno); #ifdef CONFIG_BLOCK void printk_all_partitions(void); -dev_t blk_lookup_devt(const char *name, int partno); #else /* CONFIG_BLOCK */ static inline void printk_all_partitions(void) { } -static inline dev_t blk_lookup_devt(const char *name, int partno) -{ - dev_t devt = MKDEV(0, 0); - return devt; -} #endif /* CONFIG_BLOCK */ #endif /* _LINUX_GENHD_H */ diff --git a/init/do_mounts.c b/init/do_mounts.c index b5f9604d0c98a2..aef2f24461c7f1 100644 --- a/init/do_mounts.c +++ b/init/do_mounts.c @@ -90,7 +90,6 @@ static int match_dev_by_uuid(struct device *dev, const void *data) return 0; } - /** * devt_from_partuuid - looks up the dev_t of a partition by its UUID * @uuid_str: char array containing ascii UUID @@ -186,7 +185,83 @@ static int match_dev_by_label(struct device *dev, const void *data) return 0; } -#endif + +static dev_t devt_from_partlabel(const char *label) +{ + struct device *dev; + dev_t devt = 0; + + dev = class_find_device(&block_class, NULL, label, &match_dev_by_label); + if (dev) { + devt = dev->devt; + put_device(dev); + } + + return devt; +} + +static dev_t devt_from_devname(const char *name) +{ + dev_t devt = 0; + int part; + char s[32]; + char *p; + + if (strlen(name) > 31) + return 0; + strcpy(s, name); + for (p = s; *p; p++) { + if (*p == '/') + *p = '!'; + } + + devt = blk_lookup_devt(s, 0); + if (devt) + return devt; + + /* + * Try non-existent, but valid partition, which may only exist after + * opening the device, like partitioned md devices. + */ + while (p > s && isdigit(p[-1])) + p--; + if (p == s || !*p || *p == '0') + return 0; + + /* try disk name without */ + part = simple_strtoul(p, NULL, 10); + *p = '\0'; + devt = blk_lookup_devt(s, part); + if (devt) + return devt; + + /* try disk name without p */ + if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p') + return 0; + p[-1] = '\0'; + return blk_lookup_devt(s, part); +} +#endif /* CONFIG_BLOCK */ + +static dev_t devt_from_devnum(const char *name) +{ + unsigned maj, min, offset; + dev_t devt = 0; + char *p, dummy; + + if (sscanf(name, "%u:%u%c", &maj, &min, &dummy) == 2 || + sscanf(name, "%u:%u:%u:%c", &maj, &min, &offset, &dummy) == 3) { + devt = MKDEV(maj, min); + if (maj != MAJOR(devt) || min != MINOR(devt)) + return 0; + } else { + devt = new_decode_dev(simple_strtoul(name, &p, 16)); + if (*p) + return 0; + } + + return devt; +} /* * Convert a name into device number. We accept the following variants: @@ -218,101 +293,23 @@ static int match_dev_by_label(struct device *dev, const void *data) * name contains slashes, the device name has them replaced with * bangs. */ - dev_t name_to_dev_t(const char *name) { - char s[32]; - char *p; - dev_t res = 0; - int part; - + if (strcmp(name, "/dev/nfs") == 0) + return Root_NFS; + if (strcmp(name, "/dev/cifs") == 0) + return Root_CIFS; + if (strcmp(name, "/dev/ram") == 0) + return Root_RAM0; #ifdef CONFIG_BLOCK - if (strncmp(name, "PARTUUID=", 9) == 0) { - name += 9; - res = devt_from_partuuid(name); - if (!res) - goto fail; - goto done; - } else if (strncmp(name, "PARTLABEL=", 10) == 0) { - struct device *dev; - - dev = class_find_device(&block_class, NULL, name + 10, - &match_dev_by_label); - if (!dev) - goto fail; - - res = dev->devt; - put_device(dev); - goto done; - } + if (strncmp(name, "PARTUUID=", 9) == 0) + return devt_from_partuuid(name + 9); + if (strncmp(name, "PARTLABEL=", 10) == 0) + return devt_from_partlabel(name + 10); + if (strncmp(name, "/dev/", 5) == 0) + return devt_from_devname(name + 5); #endif - - if (strncmp(name, "/dev/", 5) != 0) { - unsigned maj, min, offset; - char dummy; - - if ((sscanf(name, "%u:%u%c", &maj, &min, &dummy) == 2) || - (sscanf(name, "%u:%u:%u:%c", &maj, &min, &offset, &dummy) == 3)) { - res = MKDEV(maj, min); - if (maj != MAJOR(res) || min != MINOR(res)) - goto fail; - } else { - res = new_decode_dev(simple_strtoul(name, &p, 16)); - if (*p) - goto fail; - } - goto done; - } - - name += 5; - res = Root_NFS; - if (strcmp(name, "nfs") == 0) - goto done; - res = Root_CIFS; - if (strcmp(name, "cifs") == 0) - goto done; - res = Root_RAM0; - if (strcmp(name, "ram") == 0) - goto done; - - if (strlen(name) > 31) - goto fail; - strcpy(s, name); - for (p = s; *p; p++) - if (*p == '/') - *p = '!'; - res = blk_lookup_devt(s, 0); - if (res) - goto done; - - /* - * try non-existent, but valid partition, which may only exist - * after revalidating the disk, like partitioned md devices - */ - while (p > s && isdigit(p[-1])) - p--; - if (p == s || !*p || *p == '0') - goto fail; - - /* try disk name without */ - part = simple_strtoul(p, NULL, 10); - *p = '\0'; - res = blk_lookup_devt(s, part); - if (res) - goto done; - - /* try disk name without p */ - if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p') - goto fail; - p[-1] = '\0'; - res = blk_lookup_devt(s, part); - if (res) - goto done; - -fail: - return 0; -done: - return res; + return devt_from_devnum(name); } EXPORT_SYMBOL_GPL(name_to_dev_t); From patchwork Thu Nov 26 13:03:55 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11933527 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D2C70C83029 for ; 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bh=ao+1FiqGUQ1AALOAqwHpxEZ0P2YDoki48ylbxSmNHsY=; b=KbblidYDIJgxo0wS7OjZlqpeDo 0Gy1P4UcgzMcv0vCApvsQaerxeQlLLPVUH2jH4Qi2bRsQ0pimHQv79C3yuDeOxd3I/4/mRX3iK06D AkolSwHokuJOeqsB/iNpPXS6Cpav/EI66wmN+yfYL50Gopg/i136bEsaDVCt8Pc6zTvdKnlbv4xjx mdpkjRc8JtK8Af+D+WnGKgVyu5Qf5YPmaNi6pe0w3mlERotdlUSyDZyTBCHhWsAfefUdgp/hq2HJs zhuYdvTVf28C84QVzf5RFeq02h/nKPAVFnJU8U6EmdQruKCn9XAMjci010fOnHwlwdbzlYuQaUhHD fIqCCTuQ==; Received: from [2001:4bb8:18c:1dd6:27b8:b8a1:c13e:ceb1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGzB-000411-CI; Thu, 26 Nov 2020 13:06:57 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , dm-devel@redhat.com, Jan Kara , linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 17/44] init: refactor devt_from_partuuid Date: Thu, 26 Nov 2020 14:03:55 +0100 Message-Id: <20201126130422.92945-18-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201126130422.92945-1-hch@lst.de> References: <20201126130422.92945-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org The code in devt_from_partuuid is very convoluted. Refactor a bit by sanitizing the goto and variable name usage. Signed-off-by: Christoph Hellwig Reviewed-by: Greg Kroah-Hartman Reviewed-by: Jan Kara Acked-by: Tejun Heo --- init/do_mounts.c | 68 ++++++++++++++++++++++-------------------------- 1 file changed, 31 insertions(+), 37 deletions(-) diff --git a/init/do_mounts.c b/init/do_mounts.c index aef2f24461c7f1..afa26a4028d25e 100644 --- a/init/do_mounts.c +++ b/init/do_mounts.c @@ -105,13 +105,10 @@ static int match_dev_by_uuid(struct device *dev, const void *data) */ static dev_t devt_from_partuuid(const char *uuid_str) { - dev_t res = 0; struct uuidcmp cmp; struct device *dev = NULL; - struct gendisk *disk; - struct hd_struct *part; + dev_t devt = 0; int offset = 0; - bool clear_root_wait = false; char *slash; cmp.uuid = uuid_str; @@ -120,52 +117,49 @@ static dev_t devt_from_partuuid(const char *uuid_str) /* Check for optional partition number offset attributes. */ if (slash) { char c = 0; + /* Explicitly fail on poor PARTUUID syntax. */ - if (sscanf(slash + 1, - "PARTNROFF=%d%c", &offset, &c) != 1) { - clear_root_wait = true; - goto done; - } + if (sscanf(slash + 1, "PARTNROFF=%d%c", &offset, &c) != 1) + goto clear_root_wait; cmp.len = slash - uuid_str; } else { cmp.len = strlen(uuid_str); } - if (!cmp.len) { - clear_root_wait = true; - goto done; - } + if (!cmp.len) + goto clear_root_wait; - dev = class_find_device(&block_class, NULL, &cmp, - &match_dev_by_uuid); + dev = class_find_device(&block_class, NULL, &cmp, &match_dev_by_uuid); if (!dev) - goto done; - - res = dev->devt; + return 0; - /* Attempt to find the partition by offset. */ - if (!offset) - goto no_offset; + if (offset) { + /* + * Attempt to find the requested partition by adding an offset + * to the partition number found by UUID. + */ + struct hd_struct *part; - res = 0; - disk = part_to_disk(dev_to_part(dev)); - part = disk_get_part(disk, dev_to_part(dev)->partno + offset); - if (part) { - res = part_devt(part); - put_device(part_to_dev(part)); + part = disk_get_part(dev_to_disk(dev), + dev_to_part(dev)->partno + offset); + if (part) { + devt = part_devt(part); + put_device(part_to_dev(part)); + } + } else { + devt = dev->devt; } -no_offset: put_device(dev); -done: - if (clear_root_wait) { - pr_err("VFS: PARTUUID= is invalid.\n" - "Expected PARTUUID=[/PARTNROFF=%%d]\n"); - if (root_wait) - pr_err("Disabling rootwait; root= is invalid.\n"); - root_wait = 0; - } - return res; + return devt; + +clear_root_wait: + pr_err("VFS: PARTUUID= is invalid.\n" + "Expected PARTUUID=[/PARTNROFF=%%d]\n"); + if (root_wait) + pr_err("Disabling rootwait; root= is invalid.\n"); + root_wait = 0; + return 0; } /** From patchwork Thu Nov 26 13:03:56 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11933517 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4A7EBC83016 for ; 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bh=h5jD3nKoGxX1nrfDFkuFqjmtZeLc4uJpqdz/BICw9t8=; b=k3nNG2RH75y58js8+Vo5pBOeIS j/gFhWrm8PRi2UDdC/MtMS33EBTuzXL6Ns8KGuAqd9Fy9kQS/aLWk0O+UcJquNAE+FCNCieqwpEtW grhxwW+y6kKMy/YJXpk5Oq2Oh6p9RyGUnUk+mzGx6GMaz5GkKeuirVqT8TTN/kr7q7gfMSypBh7iL 72+DisgEGO6LqCBdeMFAJIRF4A0d6vHIS+w6E5SLxZ6rN+KGzF6tYBXU/WSD2XZKPxbnW2GcH8Fk6 z2WdYER0oJynrKhhL6oEmXPUOTEgQVOz63wWfaAVPF0AUCwf/+aIcYWz60nXpAkgdW5p+n66ZlZTv 97LC62kA==; Received: from [2001:4bb8:18c:1dd6:27b8:b8a1:c13e:ceb1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGzC-00041F-RE; Thu, 26 Nov 2020 13:06:59 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , dm-devel@redhat.com, Jan Kara , linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 18/44] init: cleanup match_dev_by_uuid and match_dev_by_label Date: Thu, 26 Nov 2020 14:03:56 +0100 Message-Id: <20201126130422.92945-19-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201126130422.92945-1-hch@lst.de> References: <20201126130422.92945-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Avoid a totally pointless goto label, and use the same style of comparism for both helpers. Signed-off-by: Christoph Hellwig Reviewed-by: Greg Kroah-Hartman Reviewed-by: Jan Kara Reviewed-by: Johannes Thumshirn Acked-by: Tejun Heo --- init/do_mounts.c | 18 ++++++------------ 1 file changed, 6 insertions(+), 12 deletions(-) diff --git a/init/do_mounts.c b/init/do_mounts.c index afa26a4028d25e..5879edf083b318 100644 --- a/init/do_mounts.c +++ b/init/do_mounts.c @@ -79,15 +79,10 @@ static int match_dev_by_uuid(struct device *dev, const void *data) const struct uuidcmp *cmp = data; struct hd_struct *part = dev_to_part(dev); - if (!part->info) - goto no_match; - - if (strncasecmp(cmp->uuid, part->info->uuid, cmp->len)) - goto no_match; - + if (!part->info || + strncasecmp(cmp->uuid, part->info->uuid, cmp->len)) + return 0; return 1; -no_match: - return 0; } /** @@ -174,10 +169,9 @@ static int match_dev_by_label(struct device *dev, const void *data) const char *label = data; struct hd_struct *part = dev_to_part(dev); - if (part->info && !strcmp(label, part->info->volname)) - return 1; - - return 0; + if (!part->info || strcmp(label, part->info->volname)) + return 0; + return 1; } static dev_t devt_from_partlabel(const char *label) From patchwork Thu Nov 26 13:03:57 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11933513 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C1274C83014 for ; Thu, 26 Nov 2020 13:07:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 72972221EB for ; Thu, 26 Nov 2020 13:07:15 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="pD29czXU" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389933AbgKZNHN (ORCPT ); Thu, 26 Nov 2020 08:07:13 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53094 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389917AbgKZNHL (ORCPT ); Thu, 26 Nov 2020 08:07:11 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 50EADC0613D4; Thu, 26 Nov 2020 05:07:11 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=Bme5TLsLFPob464lUA3WbC3cRcGjsnB3bNEoo7Ro4xo=; b=pD29czXUGx7/JOI4aMyEeWQSMv N1pSrnLkpYZ1vq8lC0yj+QgDREYrZk8VsWtw25yH+LOOzsfPs12mfVambko3CQU5GmLhQd+ADpITR NimIO8kPlWXa1Ia40xiB690MR+b5inhHr9jscb7BELxpkGdihO6KSv4PW4H+bkyq/lvvorRsTObAn Z9+1XFVjPvzDzKPe4mnNvFUtdTeoIJI+do7cSsBSktZYaHDBuk98oBX5ks+o27ANd3JuHjqbQ/zPV JT3vxOZ0JJZMxIPsjC2wmWnt/UCdnXQTIIFNjhYzNw52BemG06yiDmkrywPn4RYaymOzpQ9HDY4rz q2zpyhig==; Received: from [2001:4bb8:18c:1dd6:27b8:b8a1:c13e:ceb1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGzE-00041Y-0x; Thu, 26 Nov 2020 13:07:00 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , dm-devel@redhat.com, Jan Kara , linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 19/44] block: refactor __blkdev_put Date: Thu, 26 Nov 2020 14:03:57 +0100 Message-Id: <20201126130422.92945-20-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201126130422.92945-1-hch@lst.de> References: <20201126130422.92945-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Reorder the code to have one big section for the last close, and to use bdev_is_partition. Signed-off-by: Christoph Hellwig Reviewed-by: Greg Kroah-Hartman Reviewed-by: Jan Kara Acked-by: Tejun Heo --- fs/block_dev.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/fs/block_dev.c b/fs/block_dev.c index d707ab376da86e..41c50cfba864e2 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -1738,22 +1738,22 @@ static void __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part) WARN_ON_ONCE(bdev->bd_holders); sync_blockdev(bdev); kill_bdev(bdev); - bdev_write_inode(bdev); - } - if (bdev->bd_contains == bdev) { - if (disk->fops->release) + + if (!bdev_is_partition(bdev) && disk->fops->release) disk->fops->release(disk, mode); - } - if (!bdev->bd_openers) { + disk_put_part(bdev->bd_part); bdev->bd_part = NULL; bdev->bd_disk = NULL; - if (bdev != bdev->bd_contains) + if (bdev_is_partition(bdev)) victim = bdev->bd_contains; bdev->bd_contains = NULL; put_disk_and_module(disk); + } else { + if (!bdev_is_partition(bdev) && disk->fops->release) + disk->fops->release(disk, mode); } mutex_unlock(&bdev->bd_mutex); bdput(bdev); From patchwork Thu Nov 26 13:03:58 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11933515 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 76C13C8301A for ; Thu, 26 Nov 2020 13:07:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2D436221F9 for ; Thu, 26 Nov 2020 13:07:16 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="X7JdJYUg" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389942AbgKZNHP (ORCPT ); Thu, 26 Nov 2020 08:07:15 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53106 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389937AbgKZNHO (ORCPT ); Thu, 26 Nov 2020 08:07:14 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BAF8BC0613D4; Thu, 26 Nov 2020 05:07:13 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=emCbLrdr3Lg4sKeFv77XWCdTzb4EwQAGX4/BNxIQs5E=; b=X7JdJYUg3d702lBANhH9pQ4Scf IXdaditU5SAIl/lQtZaCNhSNnV7GLBK6AVXpi9Fox49bEpHZSze3tqkxriRLzcd9BSig21A5+MpFD baC7YCMoqIlDTXuFVuHKJOjiLfUa21ZeGUpVfjaYwjSPccY/cHvsi0qBBUcWP33TYKoNz03Es7WN3 +66Wadbz0yXtAgTAtYUTJt/P3J8vCNB2FSNOYBFpZhxECFQKoGHQMU0xx3wlA/rygbixkHnOrQq0z 3bbTs7hw9u1ZCwMo1hJ5IagUWXcrNYm9Wr7deG9RmkikyMwRPiWaiCrnImxkqfAVci+732on6rPn2 48WZDrTw==; Received: from [2001:4bb8:18c:1dd6:27b8:b8a1:c13e:ceb1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGzF-00041m-7c; Thu, 26 Nov 2020 13:07:01 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , dm-devel@redhat.com, Jan Kara , linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 20/44] block: refactor blkdev_get Date: Thu, 26 Nov 2020 14:03:58 +0100 Message-Id: <20201126130422.92945-21-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201126130422.92945-1-hch@lst.de> References: <20201126130422.92945-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Move more code that is only run on the outer open but not the open of the underlying whole device when opening a partition into blkdev_get, which leads to a much easier to follow structure. This allows to simplify the disk and module refcounting so that one reference is held for each open, similar to what we do with normal file operations. Signed-off-by: Christoph Hellwig Acked-by: Tejun Heo Reviewed-by: Jan Kara --- fs/block_dev.c | 185 +++++++++++++++++++++++-------------------------- 1 file changed, 86 insertions(+), 99 deletions(-) diff --git a/fs/block_dev.c b/fs/block_dev.c index 41c50cfba864e2..86a61a2141f642 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -1403,46 +1403,12 @@ EXPORT_SYMBOL_GPL(bdev_disk_changed); * mutex_lock(part->bd_mutex) * mutex_lock_nested(whole->bd_mutex, 1) */ - -static int __blkdev_get(struct block_device *bdev, fmode_t mode, void *holder, - int for_part) +static int __blkdev_get(struct block_device *bdev, struct gendisk *disk, + int partno, fmode_t mode) { - struct block_device *whole = NULL, *claiming = NULL; - struct gendisk *disk; int ret; - int partno; - bool first_open = false, unblock_events = true, need_restart; - - restart: - need_restart = false; - ret = -ENXIO; - disk = bdev_get_gendisk(bdev, &partno); - if (!disk) - goto out; - - if (partno) { - whole = bdget_disk(disk, 0); - if (!whole) { - ret = -ENOMEM; - goto out_put_disk; - } - } - if (!for_part && (mode & FMODE_EXCL)) { - WARN_ON_ONCE(!holder); - if (whole) - claiming = whole; - else - claiming = bdev; - ret = bd_prepare_to_claim(bdev, claiming, holder); - if (ret) - goto out_put_whole; - } - - disk_block_events(disk); - mutex_lock_nested(&bdev->bd_mutex, for_part); if (!bdev->bd_openers) { - first_open = true; bdev->bd_disk = disk; bdev->bd_contains = bdev; bdev->bd_partno = partno; @@ -1454,15 +1420,8 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, void *holder, goto out_clear; ret = 0; - if (disk->fops->open) { + if (disk->fops->open) ret = disk->fops->open(bdev, mode); - /* - * If we lost a race with 'disk' being deleted, - * try again. See md.c - */ - if (ret == -ERESTARTSYS) - need_restart = true; - } if (!ret) { bd_set_nr_sectors(bdev, get_capacity(disk)); @@ -1482,14 +1441,23 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, void *holder, if (ret) goto out_clear; } else { - BUG_ON(for_part); - ret = __blkdev_get(whole, mode, NULL, 1); - if (ret) + struct block_device *whole = bdget_disk(disk, 0); + + mutex_lock_nested(&whole->bd_mutex, 1); + ret = __blkdev_get(whole, disk, 0, mode); + if (ret) { + mutex_unlock(&whole->bd_mutex); + bdput(whole); goto out_clear; - bdev->bd_contains = bdgrab(whole); + } + whole->bd_part_count++; + mutex_unlock(&whole->bd_mutex); + + bdev->bd_contains = whole; bdev->bd_part = disk_get_part(disk, partno); if (!(disk->flags & GENHD_FL_UP) || !bdev->bd_part || !bdev->bd_part->nr_sects) { + __blkdev_put(whole, mode, 1); ret = -ENXIO; goto out_clear; } @@ -1509,58 +1477,17 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, void *holder, (!ret || ret == -ENOMEDIUM)) bdev_disk_changed(bdev, ret == -ENOMEDIUM); if (ret) - goto out_unlock_bdev; + return ret; } } bdev->bd_openers++; - if (for_part) - bdev->bd_part_count++; - if (claiming) - bd_finish_claiming(bdev, claiming, holder); - - /* - * Block event polling for write claims if requested. Any write holder - * makes the write_holder state stick until all are released. This is - * good enough and tracking individual writeable reference is too - * fragile given the way @mode is used in blkdev_get/put(). - */ - if (claiming && (mode & FMODE_WRITE) && !bdev->bd_write_holder && - (disk->flags & GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE)) { - bdev->bd_write_holder = true; - unblock_events = false; - } - mutex_unlock(&bdev->bd_mutex); - - if (unblock_events) - disk_unblock_events(disk); - - /* only one opener holds refs to the module and disk */ - if (!first_open) - put_disk_and_module(disk); - if (whole) - bdput(whole); return 0; out_clear: disk_put_part(bdev->bd_part); bdev->bd_disk = NULL; bdev->bd_part = NULL; - if (bdev != bdev->bd_contains) - __blkdev_put(bdev->bd_contains, mode, 1); bdev->bd_contains = NULL; - out_unlock_bdev: - if (claiming) - bd_abort_claiming(bdev, claiming, holder); - mutex_unlock(&bdev->bd_mutex); - disk_unblock_events(disk); - out_put_whole: - if (whole) - bdput(whole); - out_put_disk: - put_disk_and_module(disk); - if (need_restart) - goto restart; - out: return ret; } @@ -1585,7 +1512,12 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, void *holder, */ static int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder) { - int ret, perm = 0; + struct block_device *claiming; + bool unblock_events = true; + struct gendisk *disk; + int perm = 0; + int partno; + int ret; if (mode & FMODE_READ) perm |= MAY_READ; @@ -1595,13 +1527,67 @@ static int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder) if (ret) goto bdput; - ret =__blkdev_get(bdev, mode, holder, 0); - if (ret) + /* + * If we lost a race with 'disk' being deleted, try again. See md.c. + */ +retry: + ret = -ENXIO; + disk = bdev_get_gendisk(bdev, &partno); + if (!disk) goto bdput; - return 0; + if (mode & FMODE_EXCL) { + WARN_ON_ONCE(!holder); + + ret = -ENOMEM; + claiming = bdget_disk(disk, 0); + if (!claiming) + goto put_disk; + ret = bd_prepare_to_claim(bdev, claiming, holder); + if (ret) + goto put_claiming; + } + + disk_block_events(disk); + + mutex_lock(&bdev->bd_mutex); + ret =__blkdev_get(bdev, disk, partno, mode); + if (!(mode & FMODE_EXCL)) { + ; /* nothing to do here */ + } else if (ret) { + bd_abort_claiming(bdev, claiming, holder); + } else { + bd_finish_claiming(bdev, claiming, holder); + + /* + * Block event polling for write claims if requested. Any write + * holder makes the write_holder state stick until all are + * released. This is good enough and tracking individual + * writeable reference is too fragile given the way @mode is + * used in blkdev_get/put(). + */ + if ((mode & FMODE_WRITE) && !bdev->bd_write_holder && + (disk->flags & GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE)) { + bdev->bd_write_holder = true; + unblock_events = false; + } + } + mutex_unlock(&bdev->bd_mutex); + + if (unblock_events) + disk_unblock_events(disk); + +put_claiming: + if (mode & FMODE_EXCL) + bdput(claiming); +put_disk: + if (ret) + put_disk_and_module(disk); + if (ret == -ERESTARTSYS) + goto retry; bdput: - bdput(bdev); + if (ret) + bdput(bdev); return ret; } @@ -1749,8 +1735,6 @@ static void __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part) if (bdev_is_partition(bdev)) victim = bdev->bd_contains; bdev->bd_contains = NULL; - - put_disk_and_module(disk); } else { if (!bdev_is_partition(bdev) && disk->fops->release) disk->fops->release(disk, mode); @@ -1763,6 +1747,8 @@ static void __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part) void blkdev_put(struct block_device *bdev, fmode_t mode) { + struct gendisk *disk = bdev->bd_disk; + mutex_lock(&bdev->bd_mutex); if (mode & FMODE_EXCL) { @@ -1791,7 +1777,7 @@ void blkdev_put(struct block_device *bdev, fmode_t mode) * unblock evpoll if it was a write holder. */ if (bdev_free && bdev->bd_write_holder) { - disk_unblock_events(bdev->bd_disk); + disk_unblock_events(disk); bdev->bd_write_holder = false; } } @@ -1801,11 +1787,12 @@ void blkdev_put(struct block_device *bdev, fmode_t mode) * event. This is to ensure detection of media removal commanded * from userland - e.g. eject(1). */ - disk_flush_events(bdev->bd_disk, DISK_EVENT_MEDIA_CHANGE); + disk_flush_events(disk, DISK_EVENT_MEDIA_CHANGE); mutex_unlock(&bdev->bd_mutex); __blkdev_put(bdev, mode, 0); + put_disk_and_module(disk); } EXPORT_SYMBOL(blkdev_put); From patchwork Thu Nov 26 13:03:59 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11933523 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 19013C83018 for ; Thu, 26 Nov 2020 13:07:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B971721D46 for ; Thu, 26 Nov 2020 13:07:23 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="JWcPR2Cz" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389951AbgKZNHS (ORCPT ); Thu, 26 Nov 2020 08:07:18 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53118 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389944AbgKZNHQ (ORCPT ); Thu, 26 Nov 2020 08:07:16 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E0A5FC061A04; Thu, 26 Nov 2020 05:07:15 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=5gqSfUEPjcqcvSOENSbeIw4Q7nJzcUAFuskTYoCv0hA=; b=JWcPR2Czk6lpE+7kEj6vIMT2+/ 4nicpsqgBYNWPrgpWKio4K0jeCe98Uc0g0V9XvFN5/UOpUTdPX8bCSz599ECAiNsDa9IJUPuHehU9 MwG78A+rwJdIl84DsbRHcZAsiL6DIfCCmgvr8NKINemzjL99+qQIjGMo2ugbnW7FuELEJ/QAJ7922 aVEnYZjGfu+QFdUK0bXGpy16LW0SS4/NZuDX+KSRtGaN32GdP7RGL6vQfCLc/lGeMv41tUfghfTD2 YLBhFsDW/u+tArfinK1HJR9C1dufWvDt7yaV8HXH5KfxNloQgg9nLcNaHylzqSwgSzK3/n/NPrBf6 EnNEM4Ow==; Received: from [2001:4bb8:18c:1dd6:27b8:b8a1:c13e:ceb1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGzG-000424-OK; Thu, 26 Nov 2020 13:07:03 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , dm-devel@redhat.com, Jan Kara , linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 21/44] block: move bdput() to the callers of __blkdev_get Date: Thu, 26 Nov 2020 14:03:59 +0100 Message-Id: <20201126130422.92945-22-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201126130422.92945-1-hch@lst.de> References: <20201126130422.92945-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org This will allow for a more symmetric calling convention going forward. Signed-off-by: Christoph Hellwig Reviewed-by: Jan Kara --- fs/block_dev.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/fs/block_dev.c b/fs/block_dev.c index 86a61a2141f642..d0783c55a0ce65 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -1458,6 +1458,7 @@ static int __blkdev_get(struct block_device *bdev, struct gendisk *disk, if (!(disk->flags & GENHD_FL_UP) || !bdev->bd_part || !bdev->bd_part->nr_sects) { __blkdev_put(whole, mode, 1); + bdput(whole); ret = -ENXIO; goto out_clear; } @@ -1740,9 +1741,10 @@ static void __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part) disk->fops->release(disk, mode); } mutex_unlock(&bdev->bd_mutex); - bdput(bdev); - if (victim) + if (victim) { __blkdev_put(victim, mode, 1); + bdput(victim); + } } void blkdev_put(struct block_device *bdev, fmode_t mode) @@ -1792,6 +1794,7 @@ void blkdev_put(struct block_device *bdev, fmode_t mode) mutex_unlock(&bdev->bd_mutex); __blkdev_put(bdev, mode, 0); + bdput(bdev); put_disk_and_module(disk); } EXPORT_SYMBOL(blkdev_put); From patchwork Thu Nov 26 13:04:00 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11933563 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A1A7FC83020 for ; Thu, 26 Nov 2020 13:07:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 49A15221E9 for ; Thu, 26 Nov 2020 13:07:20 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="FvaOkU4k" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389955AbgKZNHT (ORCPT ); Thu, 26 Nov 2020 08:07:19 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53116 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389943AbgKZNHQ (ORCPT ); Thu, 26 Nov 2020 08:07:16 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DB737C0617A7; Thu, 26 Nov 2020 05:07:15 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=nM9OOc09jMaYn13UV1xnGqzKik4TLLc3/ktZdtaCR0w=; b=FvaOkU4kHXBfdVMOB12oBu42Hv 2Q6c93H7622fyezJLxcX1lNn6/+eBm1N4BO6MUqga76cjNXsxq+yP9INBhup2opIJdInRULSN9aDv GXbI+5/8/S8q0EEQqeJMGpAxYRc9Bouh85ULoV7h2+YJtrqWK591lWcqICJoIMhn+6U32lVibdG6c zdzfdXIPDC9Gr8O03nTWJEA0xUmb3isXObNWRHLOLN9RLVwU4MUy3AIKq3kZuzMn+AmgsOgUThrS/ AH8fDByu5LV7WH3TMt6wI71LLeECxnAiCKy4fsXHiDZZN9KarAZRFuaXs+F2IoEGCuauV4qgnSctF 1Pk0KJbA==; Received: from [2001:4bb8:18c:1dd6:27b8:b8a1:c13e:ceb1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGzI-00042P-5Y; Thu, 26 Nov 2020 13:07:04 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , dm-devel@redhat.com, Jan Kara , linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 22/44] block: opencode devcgroup_inode_permission Date: Thu, 26 Nov 2020 14:04:00 +0100 Message-Id: <20201126130422.92945-23-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201126130422.92945-1-hch@lst.de> References: <20201126130422.92945-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Just call devcgroup_check_permission to avoid various superflous checks and a double conversion of the access flags. Signed-off-by: Christoph Hellwig Acked-by: Tejun Heo Reviewed-by: Jan Kara --- fs/block_dev.c | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-) diff --git a/fs/block_dev.c b/fs/block_dev.c index d0783c55a0ce65..b12ab68297baf3 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -1516,15 +1516,13 @@ static int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder) struct block_device *claiming; bool unblock_events = true; struct gendisk *disk; - int perm = 0; int partno; int ret; - if (mode & FMODE_READ) - perm |= MAY_READ; - if (mode & FMODE_WRITE) - perm |= MAY_WRITE; - ret = devcgroup_inode_permission(bdev->bd_inode, perm); + ret = devcgroup_check_permission(DEVCG_DEV_BLOCK, + imajor(bdev->bd_inode), iminor(bdev->bd_inode), + ((mode & FMODE_READ) ? DEVCG_ACC_READ : 0) | + ((mode & FMODE_WRITE) ? DEVCG_ACC_WRITE : 0)); if (ret) goto bdput; From patchwork Thu Nov 26 13:04:01 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11933521 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 20BD9C83023 for ; Thu, 26 Nov 2020 13:07:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B8A67221FA for ; Thu, 26 Nov 2020 13:07:20 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="JIuiR46Q" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389957AbgKZNHT (ORCPT ); Thu, 26 Nov 2020 08:07:19 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53112 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389937AbgKZNHP (ORCPT ); Thu, 26 Nov 2020 08:07:15 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 20C20C0613D4; Thu, 26 Nov 2020 05:07:15 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=Fdk2SbxFJnUzF1xr66AiIRjJsPPsVh7OjkOGZYMxKrY=; b=JIuiR46QhAlyfGkO2XlYufT60H PxwxDjkvrIvrMNrlXVt+onF/DqqPNRBwXUJxu3Crt+BF85Sv/nSLmbjCQLVTsAeJNe4h4ak71SIDx K+a368pcVPgVAGGqoTWHJ/9bBe5mBH2XwlfwXxR0Hp2TkFxDqft4si0AbBz4/ptGB8VxJQh+EBCPn iPS1yfkh1cNujH1GGmzyljRIMMbqUSwyEBkPUFKcp4/cq8LIfxnijPVGZ4k2foJWSRm09su8EwQED QykV+C5W0jeeUug2OFGMl/s3x/aywh3+RqFovBH81BrM6+V4KVTRBN1fnHxBJ7ldjxAa6WoFoFffw mPHh4c6g==; Received: from [2001:4bb8:18c:1dd6:27b8:b8a1:c13e:ceb1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGzJ-00042b-99; Thu, 26 Nov 2020 13:07:05 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , dm-devel@redhat.com, Jan Kara , linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 23/44] block: remove i_bdev Date: Thu, 26 Nov 2020 14:04:01 +0100 Message-Id: <20201126130422.92945-24-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201126130422.92945-1-hch@lst.de> References: <20201126130422.92945-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Switch the block device lookup interfaces to directly work with a dev_t so that struct block_device references are only acquired by the blkdev_get variants (and the blk-cgroup special case). This means that we now don't need an extra reference in the inode and can generally simplify handling of struct block_device to keep the lookups contained in the core block layer code. Signed-off-by: Christoph Hellwig Acked-by: Tejun Heo Acked-by: Coly Li [bcache] Reviewed-by: Jan Kara --- block/ioctl.c | 3 +- drivers/block/loop.c | 8 +- drivers/md/bcache/super.c | 20 +- drivers/md/dm-table.c | 9 +- drivers/mtd/mtdsuper.c | 17 +- drivers/target/target_core_file.c | 6 +- drivers/usb/gadget/function/storage_common.c | 8 +- fs/block_dev.c | 195 +++++-------------- fs/btrfs/volumes.c | 13 +- fs/inode.c | 3 - fs/internal.h | 7 +- fs/io_uring.c | 10 +- fs/pipe.c | 5 +- fs/quota/quota.c | 19 +- fs/statfs.c | 2 +- fs/super.c | 37 ++-- include/linux/blkdev.h | 2 +- include/linux/fs.h | 1 - 18 files changed, 114 insertions(+), 251 deletions(-) diff --git a/block/ioctl.c b/block/ioctl.c index 0c09bb7a6ff35f..a6d8171221c7dc 100644 --- a/block/ioctl.c +++ b/block/ioctl.c @@ -590,8 +590,7 @@ long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg) { int ret; void __user *argp = compat_ptr(arg); - struct inode *inode = file->f_mapping->host; - struct block_device *bdev = inode->i_bdev; + struct block_device *bdev = I_BDEV(file->f_mapping->host); struct gendisk *disk = bdev->bd_disk; fmode_t mode = file->f_mode; loff_t size; diff --git a/drivers/block/loop.c b/drivers/block/loop.c index b42c728620c9e4..26c7aafba7c5f8 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -675,10 +675,10 @@ static int loop_validate_file(struct file *file, struct block_device *bdev) while (is_loop_device(f)) { struct loop_device *l; - if (f->f_mapping->host->i_bdev == bdev) + if (f->f_mapping->host->i_rdev == bdev->bd_dev) return -EBADF; - l = f->f_mapping->host->i_bdev->bd_disk->private_data; + l = I_BDEV(f->f_mapping->host)->bd_disk->private_data; if (l->lo_state != Lo_bound) { return -EINVAL; } @@ -885,9 +885,7 @@ static void loop_config_discard(struct loop_device *lo) * file-backed loop devices: discarded regions read back as zero. */ if (S_ISBLK(inode->i_mode) && !lo->lo_encrypt_key_size) { - struct request_queue *backingq; - - backingq = bdev_get_queue(inode->i_bdev); + struct request_queue *backingq = bdev_get_queue(I_BDEV(inode)); max_discard_sectors = backingq->limits.max_write_zeroes_sectors; granularity = backingq->limits.discard_granularity ?: diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c index a6a5e21e4fd136..c55d3c58a7ef55 100644 --- a/drivers/md/bcache/super.c +++ b/drivers/md/bcache/super.c @@ -2380,38 +2380,38 @@ kobj_attribute_write(register, register_bcache); kobj_attribute_write(register_quiet, register_bcache); kobj_attribute_write(pendings_cleanup, bch_pending_bdevs_cleanup); -static bool bch_is_open_backing(struct block_device *bdev) +static bool bch_is_open_backing(dev_t dev) { struct cache_set *c, *tc; struct cached_dev *dc, *t; list_for_each_entry_safe(c, tc, &bch_cache_sets, list) list_for_each_entry_safe(dc, t, &c->cached_devs, list) - if (dc->bdev == bdev) + if (dc->bdev->bd_dev == dev) return true; list_for_each_entry_safe(dc, t, &uncached_devices, list) - if (dc->bdev == bdev) + if (dc->bdev->bd_dev == dev) return true; return false; } -static bool bch_is_open_cache(struct block_device *bdev) +static bool bch_is_open_cache(dev_t dev) { struct cache_set *c, *tc; list_for_each_entry_safe(c, tc, &bch_cache_sets, list) { struct cache *ca = c->cache; - if (ca->bdev == bdev) + if (ca->bdev->bd_dev == dev) return true; } return false; } -static bool bch_is_open(struct block_device *bdev) +static bool bch_is_open(dev_t dev) { - return bch_is_open_cache(bdev) || bch_is_open_backing(bdev); + return bch_is_open_cache(dev) || bch_is_open_backing(dev); } struct async_reg_args { @@ -2535,9 +2535,11 @@ static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr, sb); if (IS_ERR(bdev)) { if (bdev == ERR_PTR(-EBUSY)) { - bdev = lookup_bdev(strim(path)); + dev_t dev; + mutex_lock(&bch_register_lock); - if (!IS_ERR(bdev) && bch_is_open(bdev)) + if (lookup_bdev(strim(path), &dev) == 0 && + bch_is_open(dev)) err = "device already registered"; else err = "device busy"; diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c index ce543b761be7b2..dea67772171053 100644 --- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -348,16 +348,9 @@ static int upgrade_mode(struct dm_dev_internal *dd, fmode_t new_mode, dev_t dm_get_dev_t(const char *path) { dev_t dev; - struct block_device *bdev; - bdev = lookup_bdev(path); - if (IS_ERR(bdev)) + if (lookup_bdev(path, &dev)) dev = name_to_dev_t(path); - else { - dev = bdev->bd_dev; - bdput(bdev); - } - return dev; } EXPORT_SYMBOL_GPL(dm_get_dev_t); diff --git a/drivers/mtd/mtdsuper.c b/drivers/mtd/mtdsuper.c index c3e2098372f2e5..38b6aa849c6383 100644 --- a/drivers/mtd/mtdsuper.c +++ b/drivers/mtd/mtdsuper.c @@ -120,8 +120,8 @@ int get_tree_mtd(struct fs_context *fc, struct fs_context *fc)) { #ifdef CONFIG_BLOCK - struct block_device *bdev; - int ret, major; + dev_t dev; + int ret; #endif int mtdnr; @@ -169,20 +169,15 @@ int get_tree_mtd(struct fs_context *fc, /* try the old way - the hack where we allowed users to mount * /dev/mtdblock$(n) but didn't actually _use_ the blockdev */ - bdev = lookup_bdev(fc->source); - if (IS_ERR(bdev)) { - ret = PTR_ERR(bdev); + ret = lookup_bdev(fc->source, &dev); + if (ret) { errorf(fc, "MTD: Couldn't look up '%s': %d", fc->source, ret); return ret; } pr_debug("MTDSB: lookup_bdev() returned 0\n"); - major = MAJOR(bdev->bd_dev); - mtdnr = MINOR(bdev->bd_dev); - bdput(bdev); - - if (major == MTD_BLOCK_MAJOR) - return mtd_get_sb_by_nr(fc, mtdnr, fill_super); + if (MAJOR(dev) == MTD_BLOCK_MAJOR) + return mtd_get_sb_by_nr(fc, MINOR(dev), fill_super); #endif /* CONFIG_BLOCK */ diff --git a/drivers/target/target_core_file.c b/drivers/target/target_core_file.c index 7143d03f0e027e..b0cb5b95e892d3 100644 --- a/drivers/target/target_core_file.c +++ b/drivers/target/target_core_file.c @@ -133,10 +133,10 @@ static int fd_configure_device(struct se_device *dev) */ inode = file->f_mapping->host; if (S_ISBLK(inode->i_mode)) { - struct request_queue *q = bdev_get_queue(inode->i_bdev); + struct request_queue *q = bdev_get_queue(I_BDEV(inode)); unsigned long long dev_size; - fd_dev->fd_block_size = bdev_logical_block_size(inode->i_bdev); + fd_dev->fd_block_size = bdev_logical_block_size(I_BDEV(inode)); /* * Determine the number of bytes from i_size_read() minus * one (1) logical sector from underlying struct block_device @@ -559,7 +559,7 @@ fd_execute_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb) if (S_ISBLK(inode->i_mode)) { /* The backend is block device, use discard */ - struct block_device *bdev = inode->i_bdev; + struct block_device *bdev = I_BDEV(inode); struct se_device *dev = cmd->se_dev; ret = blkdev_issue_discard(bdev, diff --git a/drivers/usb/gadget/function/storage_common.c b/drivers/usb/gadget/function/storage_common.c index f7e6c42558eb76..b859a158a4140e 100644 --- a/drivers/usb/gadget/function/storage_common.c +++ b/drivers/usb/gadget/function/storage_common.c @@ -204,7 +204,7 @@ int fsg_lun_open(struct fsg_lun *curlun, const char *filename) if (!(filp->f_mode & FMODE_WRITE)) ro = 1; - inode = file_inode(filp); + inode = filp->f_mapping->host; if ((!S_ISREG(inode->i_mode) && !S_ISBLK(inode->i_mode))) { LINFO(curlun, "invalid file type: %s\n", filename); goto out; @@ -221,7 +221,7 @@ int fsg_lun_open(struct fsg_lun *curlun, const char *filename) if (!(filp->f_mode & FMODE_CAN_WRITE)) ro = 1; - size = i_size_read(inode->i_mapping->host); + size = i_size_read(inode); if (size < 0) { LINFO(curlun, "unable to find file size: %s\n", filename); rc = (int) size; @@ -231,8 +231,8 @@ int fsg_lun_open(struct fsg_lun *curlun, const char *filename) if (curlun->cdrom) { blksize = 2048; blkbits = 11; - } else if (inode->i_bdev) { - blksize = bdev_logical_block_size(inode->i_bdev); + } else if (S_ISBLK(inode->i_mode)) { + blksize = bdev_logical_block_size(I_BDEV(inode)); blkbits = blksize_bits(blksize); } else { blksize = 512; diff --git a/fs/block_dev.c b/fs/block_dev.c index b12ab68297baf3..03f06c1614152b 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -883,7 +883,6 @@ static struct block_device *bdget(dev_t dev) bdev->bd_dev = dev; inode->i_mode = S_IFBLK; inode->i_rdev = dev; - inode->i_bdev = bdev; inode->i_data.a_ops = &def_blk_aops; mapping_set_gfp_mask(&inode->i_data, GFP_USER); unlock_new_inode(inode); @@ -924,67 +923,8 @@ void bdput(struct block_device *bdev) { iput(bdev->bd_inode); } - EXPORT_SYMBOL(bdput); -static struct block_device *bd_acquire(struct inode *inode) -{ - struct block_device *bdev; - - spin_lock(&bdev_lock); - bdev = inode->i_bdev; - if (bdev && !inode_unhashed(bdev->bd_inode)) { - bdgrab(bdev); - spin_unlock(&bdev_lock); - return bdev; - } - spin_unlock(&bdev_lock); - - /* - * i_bdev references block device inode that was already shut down - * (corresponding device got removed). Remove the reference and look - * up block device inode again just in case new device got - * reestablished under the same device number. - */ - if (bdev) - bd_forget(inode); - - bdev = bdget(inode->i_rdev); - if (bdev) { - spin_lock(&bdev_lock); - if (!inode->i_bdev) { - /* - * We take an additional reference to bd_inode, - * and it's released in clear_inode() of inode. - * So, we can access it via ->i_mapping always - * without igrab(). - */ - bdgrab(bdev); - inode->i_bdev = bdev; - inode->i_mapping = bdev->bd_inode->i_mapping; - } - spin_unlock(&bdev_lock); - } - return bdev; -} - -/* Call when you free inode */ - -void bd_forget(struct inode *inode) -{ - struct block_device *bdev = NULL; - - spin_lock(&bdev_lock); - if (!sb_is_blkdev_sb(inode->i_sb)) - bdev = inode->i_bdev; - inode->i_bdev = NULL; - inode->i_mapping = &inode->i_data; - spin_unlock(&bdev_lock); - - if (bdev) - bdput(bdev); -} - /** * bd_may_claim - test whether a block device can be claimed * @bdev: block device of interest @@ -1493,38 +1433,45 @@ static int __blkdev_get(struct block_device *bdev, struct gendisk *disk, } /** - * blkdev_get - open a block device - * @bdev: block_device to open + * blkdev_get_by_dev - open a block device by device number + * @dev: device number of block device to open * @mode: FMODE_* mask * @holder: exclusive holder identifier * - * Open @bdev with @mode. If @mode includes %FMODE_EXCL, @bdev is - * open with exclusive access. Specifying %FMODE_EXCL with %NULL - * @holder is invalid. Exclusive opens may nest for the same @holder. + * Open the block device described by device number @dev. If @mode includes + * If @mode includes %FMODE_EXCL, the block device is opened with exclusive + * access. Specifying %FMODE_EXCL with a %NULL @holder is invalid. Exclusive + * opens may nest for the same @holder. * - * On success, the reference count of @bdev is unchanged. On failure, - * @bdev is put. + * Use this interface ONLY if you really do not have anything better - i.e. when + * you are behind a truly sucky interface and all you are given is a device + * number. Everything else should use blkdev_get_by_path(). * * CONTEXT: * Might sleep. * * RETURNS: - * 0 on success, -errno on failure. + * Reference to the block_device on success, ERR_PTR(-errno) on failure. */ -static int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder) +struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder) { struct block_device *claiming; bool unblock_events = true; + struct block_device *bdev; struct gendisk *disk; int partno; int ret; ret = devcgroup_check_permission(DEVCG_DEV_BLOCK, - imajor(bdev->bd_inode), iminor(bdev->bd_inode), + MAJOR(dev), MINOR(dev), ((mode & FMODE_READ) ? DEVCG_ACC_READ : 0) | ((mode & FMODE_WRITE) ? DEVCG_ACC_WRITE : 0)); if (ret) - goto bdput; + return ERR_PTR(ret); + + bdev = bdget(dev); + if (!bdev) + return ERR_PTR(-ENOMEM); /* * If we lost a race with 'disk' being deleted, try again. See md.c. @@ -1585,10 +1532,13 @@ static int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder) if (ret == -ERESTARTSYS) goto retry; bdput: - if (ret) + if (ret) { bdput(bdev); - return ret; + return ERR_PTR(ret); + } + return bdev; } +EXPORT_SYMBOL(blkdev_get_by_dev); /** * blkdev_get_by_path - open a block device by name @@ -1596,32 +1546,31 @@ static int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder) * @mode: FMODE_* mask * @holder: exclusive holder identifier * - * Open the blockdevice described by the device file at @path. @mode - * and @holder are identical to blkdev_get(). + * Open the block device described by the device file at &path. * - * On success, the returned block_device has reference count of one. + * If @mode includes %FMODE_EXCL, the block device is opened with exclusive + * access. Specifying %FMODE_EXCL with a %NULL @holder is invalid. Exclusive + * opens may nest for the same @holder. * * CONTEXT: * Might sleep. * * RETURNS: - * Pointer to block_device on success, ERR_PTR(-errno) on failure. + * Reference to the block_device on success, ERR_PTR(-errno) on failure. */ struct block_device *blkdev_get_by_path(const char *path, fmode_t mode, void *holder) { struct block_device *bdev; - int err; - - bdev = lookup_bdev(path); - if (IS_ERR(bdev)) - return bdev; + dev_t dev; + int error; - err = blkdev_get(bdev, mode, holder); - if (err) - return ERR_PTR(err); + error = lookup_bdev(path, &dev); + if (error) + return ERR_PTR(error); - if ((mode & FMODE_WRITE) && bdev_read_only(bdev)) { + bdev = blkdev_get_by_dev(dev, mode, holder); + if (!IS_ERR(bdev) && (mode & FMODE_WRITE) && bdev_read_only(bdev)) { blkdev_put(bdev, mode); return ERR_PTR(-EACCES); } @@ -1630,45 +1579,6 @@ struct block_device *blkdev_get_by_path(const char *path, fmode_t mode, } EXPORT_SYMBOL(blkdev_get_by_path); -/** - * blkdev_get_by_dev - open a block device by device number - * @dev: device number of block device to open - * @mode: FMODE_* mask - * @holder: exclusive holder identifier - * - * Open the blockdevice described by device number @dev. @mode and - * @holder are identical to blkdev_get(). - * - * Use it ONLY if you really do not have anything better - i.e. when - * you are behind a truly sucky interface and all you are given is a - * device number. _Never_ to be used for internal purposes. If you - * ever need it - reconsider your API. - * - * On success, the returned block_device has reference count of one. - * - * CONTEXT: - * Might sleep. - * - * RETURNS: - * Pointer to block_device on success, ERR_PTR(-errno) on failure. - */ -struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder) -{ - struct block_device *bdev; - int err; - - bdev = bdget(dev); - if (!bdev) - return ERR_PTR(-ENOMEM); - - err = blkdev_get(bdev, mode, holder); - if (err) - return ERR_PTR(err); - - return bdev; -} -EXPORT_SYMBOL(blkdev_get_by_dev); - static int blkdev_open(struct inode * inode, struct file * filp) { struct block_device *bdev; @@ -1690,14 +1600,12 @@ static int blkdev_open(struct inode * inode, struct file * filp) if ((filp->f_flags & O_ACCMODE) == 3) filp->f_mode |= FMODE_WRITE_IOCTL; - bdev = bd_acquire(inode); - if (bdev == NULL) - return -ENOMEM; - + bdev = blkdev_get_by_dev(inode->i_rdev, filp->f_mode, filp); + if (IS_ERR(bdev)) + return PTR_ERR(bdev); filp->f_mapping = bdev->bd_inode->i_mapping; filp->f_wb_err = filemap_sample_wb_err(filp->f_mapping); - - return blkdev_get(bdev, filp->f_mode, filp); + return 0; } static void __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part) @@ -2006,37 +1914,32 @@ const struct file_operations def_blk_fops = { * namespace if possible and return it. Return ERR_PTR(error) * otherwise. */ -struct block_device *lookup_bdev(const char *pathname) +int lookup_bdev(const char *pathname, dev_t *dev) { - struct block_device *bdev; struct inode *inode; struct path path; int error; if (!pathname || !*pathname) - return ERR_PTR(-EINVAL); + return -EINVAL; error = kern_path(pathname, LOOKUP_FOLLOW, &path); if (error) - return ERR_PTR(error); + return error; inode = d_backing_inode(path.dentry); error = -ENOTBLK; if (!S_ISBLK(inode->i_mode)) - goto fail; + goto out_path_put; error = -EACCES; if (!may_open_dev(&path)) - goto fail; - error = -ENOMEM; - bdev = bd_acquire(inode); - if (!bdev) - goto fail; -out: + goto out_path_put; + + *dev = inode->i_rdev; + error = 0; +out_path_put: path_put(&path); - return bdev; -fail: - bdev = ERR_PTR(error); - goto out; + return error; } EXPORT_SYMBOL(lookup_bdev); diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index a6406b3b8c2b4f..fbc4b58228f784 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -929,16 +929,16 @@ static noinline struct btrfs_device *device_list_add(const char *path, * make sure it's the same device if the device is mounted */ if (device->bdev) { - struct block_device *path_bdev; + int error; + dev_t path_dev; - path_bdev = lookup_bdev(path); - if (IS_ERR(path_bdev)) { + error = lookup_bdev(path, &path_dev); + if (error) { mutex_unlock(&fs_devices->device_list_mutex); - return ERR_CAST(path_bdev); + return ERR_PTR(error); } - if (device->bdev != path_bdev) { - bdput(path_bdev); + if (device->bdev->bd_dev != path_dev) { mutex_unlock(&fs_devices->device_list_mutex); btrfs_warn_in_rcu(device->fs_info, "duplicate device %s devid %llu generation %llu scanned by %s (%d)", @@ -947,7 +947,6 @@ static noinline struct btrfs_device *device_list_add(const char *path, task_pid_nr(current)); return ERR_PTR(-EEXIST); } - bdput(path_bdev); btrfs_info_in_rcu(device->fs_info, "devid %llu device path %s changed to %s scanned by %s (%d)", devid, rcu_str_deref(device->name), diff --git a/fs/inode.c b/fs/inode.c index 9d78c37b00b817..cb008acf0efdb8 100644 --- a/fs/inode.c +++ b/fs/inode.c @@ -155,7 +155,6 @@ int inode_init_always(struct super_block *sb, struct inode *inode) inode->i_bytes = 0; inode->i_generation = 0; inode->i_pipe = NULL; - inode->i_bdev = NULL; inode->i_cdev = NULL; inode->i_link = NULL; inode->i_dir_seq = 0; @@ -580,8 +579,6 @@ static void evict(struct inode *inode) truncate_inode_pages_final(&inode->i_data); clear_inode(inode); } - if (S_ISBLK(inode->i_mode) && inode->i_bdev) - bd_forget(inode); if (S_ISCHR(inode->i_mode) && inode->i_cdev) cd_forget(inode); diff --git a/fs/internal.h b/fs/internal.h index 47be21dfeebef5..53f890446e7508 100644 --- a/fs/internal.h +++ b/fs/internal.h @@ -25,7 +25,6 @@ extern void __init bdev_cache_init(void); extern int __sync_blockdev(struct block_device *bdev, int wait); void iterate_bdevs(void (*)(struct block_device *, void *), void *); void emergency_thaw_bdev(struct super_block *sb); -void bd_forget(struct inode *inode); #else static inline void bdev_cache_init(void) { @@ -43,9 +42,6 @@ static inline int emergency_thaw_bdev(struct super_block *sb) { return 0; } -static inline void bd_forget(struct inode *inode) -{ -} #endif /* CONFIG_BLOCK */ /* @@ -114,8 +110,7 @@ extern struct file *alloc_empty_file_noaccount(int, const struct cred *); */ extern int reconfigure_super(struct fs_context *); extern bool trylock_super(struct super_block *sb); -struct super_block *__get_super(struct block_device *bdev, bool excl); -extern struct super_block *user_get_super(dev_t); +struct super_block *user_get_super(dev_t, bool excl); void put_super(struct super_block *sb); extern bool mount_capable(struct fs_context *); diff --git a/fs/io_uring.c b/fs/io_uring.c index 4ead291b2976f3..8f13c0417f940c 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -2716,11 +2716,7 @@ static struct file *__io_file_get(struct io_submit_state *state, int fd) static bool io_bdev_nowait(struct block_device *bdev) { -#ifdef CONFIG_BLOCK return !bdev || blk_queue_nowait(bdev_get_queue(bdev)); -#else - return true; -#endif } /* @@ -2733,14 +2729,16 @@ static bool io_file_supports_async(struct file *file, int rw) umode_t mode = file_inode(file)->i_mode; if (S_ISBLK(mode)) { - if (io_bdev_nowait(file->f_inode->i_bdev)) + if (IS_ENABLED(CONFIG_BLOCK) && + io_bdev_nowait(I_BDEV(file->f_mapping->host))) return true; return false; } if (S_ISCHR(mode) || S_ISSOCK(mode)) return true; if (S_ISREG(mode)) { - if (io_bdev_nowait(file->f_inode->i_sb->s_bdev) && + if (IS_ENABLED(CONFIG_BLOCK) && + io_bdev_nowait(file->f_inode->i_sb->s_bdev) && file->f_op != &io_uring_fops) return true; return false; diff --git a/fs/pipe.c b/fs/pipe.c index 0ac197658a2d6e..c5989cfd564d45 100644 --- a/fs/pipe.c +++ b/fs/pipe.c @@ -1342,9 +1342,8 @@ static long pipe_set_size(struct pipe_inode_info *pipe, unsigned long arg) } /* - * After the inode slimming patch, i_pipe/i_bdev/i_cdev share the same - * location, so checking ->i_pipe is not enough to verify that this is a - * pipe. + * Note that i_pipe and i_cdev share the same location, so checking ->i_pipe is + * not enough to verify that this is a pipe. */ struct pipe_inode_info *get_pipe_info(struct file *file, bool for_splice) { diff --git a/fs/quota/quota.c b/fs/quota/quota.c index f3d32b0d9008f2..6d16b2be5ac4a3 100644 --- a/fs/quota/quota.c +++ b/fs/quota/quota.c @@ -866,17 +866,18 @@ static bool quotactl_cmd_onoff(int cmd) static struct super_block *quotactl_block(const char __user *special, int cmd) { #ifdef CONFIG_BLOCK - struct block_device *bdev; struct super_block *sb; struct filename *tmp = getname(special); bool excl = false, thawed = false; + int error; + dev_t dev; if (IS_ERR(tmp)) return ERR_CAST(tmp); - bdev = lookup_bdev(tmp->name); + error = lookup_bdev(tmp->name, &dev); putname(tmp); - if (IS_ERR(bdev)) - return ERR_CAST(bdev); + if (error) + return ERR_PTR(error); if (quotactl_cmd_onoff(cmd)) { excl = true; @@ -886,8 +887,10 @@ static struct super_block *quotactl_block(const char __user *special, int cmd) } retry: - sb = __get_super(bdev, excl); - if (thawed && sb && sb->s_writers.frozen != SB_UNFROZEN) { + sb = user_get_super(dev, excl); + if (!sb) + return ERR_PTR(-ENODEV); + if (thawed && sb->s_writers.frozen != SB_UNFROZEN) { if (excl) up_write(&sb->s_umount); else @@ -897,10 +900,6 @@ static struct super_block *quotactl_block(const char __user *special, int cmd) put_super(sb); goto retry; } - - bdput(bdev); - if (!sb) - return ERR_PTR(-ENODEV); return sb; #else diff --git a/fs/statfs.c b/fs/statfs.c index 59f33752c1311f..68cb077887504f 100644 --- a/fs/statfs.c +++ b/fs/statfs.c @@ -235,7 +235,7 @@ SYSCALL_DEFINE3(fstatfs64, unsigned int, fd, size_t, sz, struct statfs64 __user static int vfs_ustat(dev_t dev, struct kstatfs *sbuf) { - struct super_block *s = user_get_super(dev); + struct super_block *s = user_get_super(dev, false); int err; if (!s) return -EINVAL; diff --git a/fs/super.c b/fs/super.c index 343e5c1e538d2a..7a1611e5d0f45d 100644 --- a/fs/super.c +++ b/fs/super.c @@ -740,7 +740,7 @@ void iterate_supers_type(struct file_system_type *type, EXPORT_SYMBOL(iterate_supers_type); -struct super_block *__get_super(struct block_device *bdev, bool excl) +struct super_block *get_super(struct block_device *bdev) { struct super_block *sb; @@ -755,17 +755,11 @@ struct super_block *__get_super(struct block_device *bdev, bool excl) if (sb->s_bdev == bdev) { sb->s_count++; spin_unlock(&sb_lock); - if (!excl) - down_read(&sb->s_umount); - else - down_write(&sb->s_umount); + down_read(&sb->s_umount); /* still alive? */ if (sb->s_root && (sb->s_flags & SB_BORN)) return sb; - if (!excl) - up_read(&sb->s_umount); - else - up_write(&sb->s_umount); + up_read(&sb->s_umount); /* nope, got unmounted */ spin_lock(&sb_lock); __put_super(sb); @@ -776,19 +770,6 @@ struct super_block *__get_super(struct block_device *bdev, bool excl) return NULL; } -/** - * get_super - get the superblock of a device - * @bdev: device to get the superblock for - * - * Scans the superblock list and finds the superblock of the file system - * mounted on the device given. %NULL is returned if no match is found. - */ -struct super_block *get_super(struct block_device *bdev) -{ - return __get_super(bdev, false); -} -EXPORT_SYMBOL(get_super); - /** * get_active_super - get an active reference to the superblock of a device * @bdev: device to get the superblock for @@ -820,7 +801,7 @@ struct super_block *get_active_super(struct block_device *bdev) return NULL; } -struct super_block *user_get_super(dev_t dev) +struct super_block *user_get_super(dev_t dev, bool excl) { struct super_block *sb; @@ -832,11 +813,17 @@ struct super_block *user_get_super(dev_t dev) if (sb->s_dev == dev) { sb->s_count++; spin_unlock(&sb_lock); - down_read(&sb->s_umount); + if (excl) + down_write(&sb->s_umount); + else + down_read(&sb->s_umount); /* still alive? */ if (sb->s_root && (sb->s_flags & SB_BORN)) return sb; - up_read(&sb->s_umount); + if (excl) + up_write(&sb->s_umount); + else + up_read(&sb->s_umount); /* nope, got unmounted */ spin_lock(&sb_lock); __put_super(sb); diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 12810a19edebc4..bdd7339bcda462 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1973,7 +1973,7 @@ int bdev_read_only(struct block_device *bdev); int set_blocksize(struct block_device *bdev, int size); const char *bdevname(struct block_device *bdev, char *buffer); -struct block_device *lookup_bdev(const char *); +int lookup_bdev(const char *pathname, dev_t *dev); void blkdev_show(struct seq_file *seqf, off_t offset); diff --git a/include/linux/fs.h b/include/linux/fs.h index a61df0dd4f1989..b0b358309657ba 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -696,7 +696,6 @@ struct inode { struct list_head i_devices; union { struct pipe_inode_info *i_pipe; - struct block_device *i_bdev; struct cdev *i_cdev; char *i_link; unsigned i_dir_seq; 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Received: from [2001:4bb8:18c:1dd6:27b8:b8a1:c13e:ceb1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGzK-00042u-RG; Thu, 26 Nov 2020 13:07:07 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , dm-devel@redhat.com, Jan Kara , linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 24/44] block: simplify bdev/disk lookup in blkdev_get Date: Thu, 26 Nov 2020 14:04:02 +0100 Message-Id: <20201126130422.92945-25-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201126130422.92945-1-hch@lst.de> References: <20201126130422.92945-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org To simplify block device lookup and a few other upcoming areas, make sure that we always have a struct block_device available for each disk and each partition, and only find existing block devices in bdget. The only downside of this is that each device and partition uses a little more memory. The upside will be that a lot of code can be simplified. With that all we need to look up the block device is to lookup the inode and do a few sanity checks on the gendisk, instead of the separate lookup for the gendisk. For blk-cgroup which wants to access a gendisk without opening it, a new blkdev_{get,put}_no_open low-level interface is added to replace the previous get_gendisk use. Note that the change to look up block device directly instead of the two step lookup using struct gendisk causes a subtile change in behavior: accessing a non-existing partition on an existing block device can now cause a call to request_module. That call is harmless, and in practice no recent system will access these nodes as they aren't created by udev and static /dev/ setups are unusual. Signed-off-by: Christoph Hellwig --- block/blk-cgroup.c | 42 ++++---- block/blk-iocost.c | 36 +++---- block/blk.h | 2 +- block/genhd.c | 210 +++++-------------------------------- block/partitions/core.c | 29 ++--- fs/block_dev.c | 178 +++++++++++++++++-------------- include/linux/blk-cgroup.h | 4 +- include/linux/blkdev.h | 6 ++ include/linux/genhd.h | 7 +- 9 files changed, 193 insertions(+), 321 deletions(-) diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c index 54fbe1e80cc41a..19650eb42b9f00 100644 --- a/block/blk-cgroup.c +++ b/block/blk-cgroup.c @@ -556,22 +556,22 @@ static struct blkcg_gq *blkg_lookup_check(struct blkcg *blkcg, } /** - * blkg_conf_prep - parse and prepare for per-blkg config update + * blkcg_conf_open_bdev - parse and open bdev for per-blkg config update * @inputp: input string pointer * * Parse the device node prefix part, MAJ:MIN, of per-blkg config update - * from @input and get and return the matching gendisk. *@inputp is + * from @input and get and return the matching bdev. *@inputp is * updated to point past the device node prefix. Returns an ERR_PTR() * value on error. * * Use this function iff blkg_conf_prep() can't be used for some reason. */ -struct gendisk *blkcg_conf_get_disk(char **inputp) +struct block_device *blkcg_conf_open_bdev(char **inputp) { char *input = *inputp; unsigned int major, minor; - struct gendisk *disk; - int key_len, part; + struct block_device *bdev; + int key_len; if (sscanf(input, "%u:%u%n", &major, &minor, &key_len) != 2) return ERR_PTR(-EINVAL); @@ -581,16 +581,16 @@ struct gendisk *blkcg_conf_get_disk(char **inputp) return ERR_PTR(-EINVAL); input = skip_spaces(input); - disk = get_gendisk(MKDEV(major, minor), &part); - if (!disk) + bdev = blkdev_get_no_open(MKDEV(major, minor)); + if (!bdev) return ERR_PTR(-ENODEV); - if (part) { - put_disk_and_module(disk); + if (bdev_is_partition(bdev)) { + blkdev_put_no_open(bdev); return ERR_PTR(-ENODEV); } *inputp = input; - return disk; + return bdev; } /** @@ -607,18 +607,18 @@ struct gendisk *blkcg_conf_get_disk(char **inputp) */ int blkg_conf_prep(struct blkcg *blkcg, const struct blkcg_policy *pol, char *input, struct blkg_conf_ctx *ctx) - __acquires(rcu) __acquires(&disk->queue->queue_lock) + __acquires(rcu) __acquires(&bdev->bd_disk->queue->queue_lock) { - struct gendisk *disk; + struct block_device *bdev; struct request_queue *q; struct blkcg_gq *blkg; int ret; - disk = blkcg_conf_get_disk(&input); - if (IS_ERR(disk)) - return PTR_ERR(disk); + bdev = blkcg_conf_open_bdev(&input); + if (IS_ERR(bdev)) + return PTR_ERR(bdev); - q = disk->queue; + q = bdev->bd_disk->queue; rcu_read_lock(); spin_lock_irq(&q->queue_lock); @@ -689,7 +689,7 @@ int blkg_conf_prep(struct blkcg *blkcg, const struct blkcg_policy *pol, goto success; } success: - ctx->disk = disk; + ctx->bdev = bdev; ctx->blkg = blkg; ctx->body = input; return 0; @@ -700,7 +700,7 @@ int blkg_conf_prep(struct blkcg *blkcg, const struct blkcg_policy *pol, spin_unlock_irq(&q->queue_lock); rcu_read_unlock(); fail: - put_disk_and_module(disk); + blkdev_put_no_open(bdev); /* * If queue was bypassing, we should retry. Do so after a * short msleep(). It isn't strictly necessary but queue @@ -723,11 +723,11 @@ EXPORT_SYMBOL_GPL(blkg_conf_prep); * with blkg_conf_prep(). */ void blkg_conf_finish(struct blkg_conf_ctx *ctx) - __releases(&ctx->disk->queue->queue_lock) __releases(rcu) + __releases(&ctx->bdev->bd_disk->queue->queue_lock) __releases(rcu) { - spin_unlock_irq(&ctx->disk->queue->queue_lock); + spin_unlock_irq(&ctx->bdev->bd_disk->queue->queue_lock); rcu_read_unlock(); - put_disk_and_module(ctx->disk); + blkdev_put_no_open(ctx->bdev); } EXPORT_SYMBOL_GPL(blkg_conf_finish); diff --git a/block/blk-iocost.c b/block/blk-iocost.c index bbe86d1199dc5b..8e20fe4bddecf7 100644 --- a/block/blk-iocost.c +++ b/block/blk-iocost.c @@ -3120,23 +3120,23 @@ static const match_table_t qos_tokens = { static ssize_t ioc_qos_write(struct kernfs_open_file *of, char *input, size_t nbytes, loff_t off) { - struct gendisk *disk; + struct block_device *bdev; struct ioc *ioc; u32 qos[NR_QOS_PARAMS]; bool enable, user; char *p; int ret; - disk = blkcg_conf_get_disk(&input); - if (IS_ERR(disk)) - return PTR_ERR(disk); + bdev = blkcg_conf_open_bdev(&input); + if (IS_ERR(bdev)) + return PTR_ERR(bdev); - ioc = q_to_ioc(disk->queue); + ioc = q_to_ioc(bdev->bd_disk->queue); if (!ioc) { - ret = blk_iocost_init(disk->queue); + ret = blk_iocost_init(bdev->bd_disk->queue); if (ret) goto err; - ioc = q_to_ioc(disk->queue); + ioc = q_to_ioc(bdev->bd_disk->queue); } spin_lock_irq(&ioc->lock); @@ -3231,12 +3231,12 @@ static ssize_t ioc_qos_write(struct kernfs_open_file *of, char *input, ioc_refresh_params(ioc, true); spin_unlock_irq(&ioc->lock); - put_disk_and_module(disk); + blkdev_put_no_open(bdev); return nbytes; einval: ret = -EINVAL; err: - put_disk_and_module(disk); + blkdev_put_no_open(bdev); return ret; } @@ -3287,23 +3287,23 @@ static const match_table_t i_lcoef_tokens = { static ssize_t ioc_cost_model_write(struct kernfs_open_file *of, char *input, size_t nbytes, loff_t off) { - struct gendisk *disk; + struct block_device *bdev; struct ioc *ioc; u64 u[NR_I_LCOEFS]; bool user; char *p; int ret; - disk = blkcg_conf_get_disk(&input); - if (IS_ERR(disk)) - return PTR_ERR(disk); + bdev = blkcg_conf_open_bdev(&input); + if (IS_ERR(bdev)) + return PTR_ERR(bdev); - ioc = q_to_ioc(disk->queue); + ioc = q_to_ioc(bdev->bd_disk->queue); if (!ioc) { - ret = blk_iocost_init(disk->queue); + ret = blk_iocost_init(bdev->bd_disk->queue); if (ret) goto err; - ioc = q_to_ioc(disk->queue); + ioc = q_to_ioc(bdev->bd_disk->queue); } spin_lock_irq(&ioc->lock); @@ -3356,13 +3356,13 @@ static ssize_t ioc_cost_model_write(struct kernfs_open_file *of, char *input, ioc_refresh_params(ioc, true); spin_unlock_irq(&ioc->lock); - put_disk_and_module(disk); + blkdev_put_no_open(bdev); return nbytes; einval: ret = -EINVAL; err: - put_disk_and_module(disk); + blkdev_put_no_open(bdev); return ret; } diff --git a/block/blk.h b/block/blk.h index dfab98465db9a5..c4839abcfa27eb 100644 --- a/block/blk.h +++ b/block/blk.h @@ -352,7 +352,6 @@ struct hd_struct *disk_map_sector_rcu(struct gendisk *disk, sector_t sector); int blk_alloc_devt(struct hd_struct *part, dev_t *devt); void blk_free_devt(dev_t devt); -void blk_invalidate_devt(dev_t devt); char *disk_name(struct gendisk *hd, int partno, char *buf); #define ADDPART_FLAG_NONE 0 #define ADDPART_FLAG_RAID 1 @@ -384,6 +383,7 @@ static inline void hd_free_part(struct hd_struct *part) { free_percpu(part->dkstats); kfree(part->info); + bdput(part->bdev); percpu_ref_exit(&part->ref); } diff --git a/block/genhd.c b/block/genhd.c index f46e89226fdf91..bf8fa82f135f4e 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -27,17 +27,11 @@ static struct kobject *block_depr; -static DEFINE_XARRAY(bdev_map); -static DEFINE_MUTEX(bdev_map_lock); +DECLARE_RWSEM(bdev_lookup_sem); /* for extended dynamic devt allocation, currently only one major is used */ #define NR_EXT_DEVT (1 << MINORBITS) - -/* For extended devt allocation. ext_devt_lock prevents look up - * results from going away underneath its user. - */ -static DEFINE_SPINLOCK(ext_devt_lock); -static DEFINE_IDR(ext_devt_idr); +static DEFINE_IDA(ext_devt_ida); static void disk_check_events(struct disk_events *ev, unsigned int *clearing_ptr); @@ -580,14 +574,7 @@ int blk_alloc_devt(struct hd_struct *part, dev_t *devt) return 0; } - /* allocate ext devt */ - idr_preload(GFP_KERNEL); - - spin_lock_bh(&ext_devt_lock); - idx = idr_alloc(&ext_devt_idr, part, 0, NR_EXT_DEVT, GFP_NOWAIT); - spin_unlock_bh(&ext_devt_lock); - - idr_preload_end(); + idx = ida_alloc_range(&ext_devt_ida, 0, NR_EXT_DEVT, GFP_KERNEL); if (idx < 0) return idx == -ENOSPC ? -EBUSY : idx; @@ -606,26 +593,8 @@ int blk_alloc_devt(struct hd_struct *part, dev_t *devt) */ void blk_free_devt(dev_t devt) { - if (devt == MKDEV(0, 0)) - return; - - if (MAJOR(devt) == BLOCK_EXT_MAJOR) { - spin_lock_bh(&ext_devt_lock); - idr_remove(&ext_devt_idr, blk_mangle_minor(MINOR(devt))); - spin_unlock_bh(&ext_devt_lock); - } -} - -/* - * We invalidate devt by assigning NULL pointer for devt in idr. - */ -void blk_invalidate_devt(dev_t devt) -{ - if (MAJOR(devt) == BLOCK_EXT_MAJOR) { - spin_lock_bh(&ext_devt_lock); - idr_replace(&ext_devt_idr, NULL, blk_mangle_minor(MINOR(devt))); - spin_unlock_bh(&ext_devt_lock); - } + if (MAJOR(devt) == BLOCK_EXT_MAJOR) + ida_free(&ext_devt_ida, blk_mangle_minor(MINOR(devt))); } static char *bdevt_str(dev_t devt, char *buf) @@ -640,28 +609,6 @@ static char *bdevt_str(dev_t devt, char *buf) return buf; } -static void blk_register_region(struct gendisk *disk) -{ - int i; - - mutex_lock(&bdev_map_lock); - for (i = 0; i < disk->minors; i++) { - if (xa_insert(&bdev_map, disk_devt(disk) + i, disk, GFP_KERNEL)) - WARN_ON_ONCE(1); - } - mutex_unlock(&bdev_map_lock); -} - -static void blk_unregister_region(struct gendisk *disk) -{ - int i; - - mutex_lock(&bdev_map_lock); - for (i = 0; i < disk->minors; i++) - xa_erase(&bdev_map, disk_devt(disk) + i); - mutex_unlock(&bdev_map_lock); -} - static void disk_scan_partitions(struct gendisk *disk) { struct block_device *bdev; @@ -805,7 +752,7 @@ static void __device_add_disk(struct device *parent, struct gendisk *disk, ret = bdi_register(bdi, "%u:%u", MAJOR(devt), MINOR(devt)); WARN_ON(ret); bdi_set_owner(bdi, dev); - blk_register_region(disk); + bdev_add(disk->part0.bdev, devt); } register_disk(parent, disk, groups); if (register_queue) @@ -847,8 +794,8 @@ static void invalidate_partition(struct gendisk *disk, int partno) __invalidate_device(bdev, true); /* - * Unhash the bdev inode for this device so that it gets evicted as soon - * as last inode reference is dropped. + * Unhash the bdev inode for this device so that it can't be looked + * up any more even if openers still hold references to it. */ remove_inode_hash(bdev->bd_inode); bdput(bdev); @@ -890,7 +837,8 @@ void del_gendisk(struct gendisk *disk) * Block lookups of the disk until all bdevs are unhashed and the * disk is marked as dead (GENHD_FL_UP cleared). */ - down_write(&disk->lookup_sem); + down_write(&bdev_lookup_sem); + /* invalidate stuff */ disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY | DISK_PITER_REVERSE); @@ -903,7 +851,7 @@ void del_gendisk(struct gendisk *disk) invalidate_partition(disk, 0); set_capacity(disk, 0); disk->flags &= ~GENHD_FL_UP; - up_write(&disk->lookup_sem); + up_write(&bdev_lookup_sem); if (!(disk->flags & GENHD_FL_HIDDEN)) { sysfs_remove_link(&disk_to_dev(disk)->kobj, "bdi"); @@ -916,16 +864,6 @@ void del_gendisk(struct gendisk *disk) } blk_unregister_queue(disk); - - if (!(disk->flags & GENHD_FL_HIDDEN)) - blk_unregister_region(disk); - /* - * Remove gendisk pointer from idr so that it cannot be looked up - * while RCU period before freeing gendisk is running to prevent - * use-after-free issues. Note that the device number stays - * "in-use" until we really free the gendisk. - */ - blk_invalidate_devt(disk_devt(disk)); kobject_put(disk->part0.holder_dir); kobject_put(disk->slave_dir); @@ -964,7 +902,7 @@ static ssize_t disk_badblocks_store(struct device *dev, return badblocks_store(disk->bb, page, len, 0); } -static void request_gendisk_module(dev_t devt) +void blk_request_module(dev_t devt) { unsigned int major = MAJOR(devt); struct blk_major_name **n; @@ -984,84 +922,6 @@ static void request_gendisk_module(dev_t devt) request_module("block-major-%d", MAJOR(devt)); } -static bool get_disk_and_module(struct gendisk *disk) -{ - struct module *owner; - - if (!disk->fops) - return false; - owner = disk->fops->owner; - if (owner && !try_module_get(owner)) - return false; - if (!kobject_get_unless_zero(&disk_to_dev(disk)->kobj)) { - module_put(owner); - return false; - } - return true; - -} - -/** - * get_gendisk - get partitioning information for a given device - * @devt: device to get partitioning information for - * @partno: returned partition index - * - * This function gets the structure containing partitioning - * information for the given device @devt. - * - * Context: can sleep - */ -struct gendisk *get_gendisk(dev_t devt, int *partno) -{ - struct gendisk *disk = NULL; - - might_sleep(); - - if (MAJOR(devt) != BLOCK_EXT_MAJOR) { - mutex_lock(&bdev_map_lock); - disk = xa_load(&bdev_map, devt); - if (!disk) { - mutex_unlock(&bdev_map_lock); - request_gendisk_module(devt); - mutex_lock(&bdev_map_lock); - disk = xa_load(&bdev_map, devt); - } - if (disk && !get_disk_and_module(disk)) - disk = NULL; - if (disk) - *partno = devt - disk_devt(disk); - mutex_unlock(&bdev_map_lock); - } else { - struct hd_struct *part; - - spin_lock_bh(&ext_devt_lock); - part = idr_find(&ext_devt_idr, blk_mangle_minor(MINOR(devt))); - if (part && get_disk_and_module(part_to_disk(part))) { - *partno = part->partno; - disk = part_to_disk(part); - } - spin_unlock_bh(&ext_devt_lock); - } - - if (!disk) - return NULL; - - /* - * Synchronize with del_gendisk() to not return disk that is being - * destroyed. - */ - down_read(&disk->lookup_sem); - if (unlikely((disk->flags & GENHD_FL_HIDDEN) || - !(disk->flags & GENHD_FL_UP))) { - up_read(&disk->lookup_sem); - put_disk_and_module(disk); - disk = NULL; - } else { - up_read(&disk->lookup_sem); - } - return disk; -} - /** * bdget_disk - do bdget() by gendisk and partition number * @disk: gendisk of interest @@ -1559,11 +1419,6 @@ int disk_expand_part_tbl(struct gendisk *disk, int partno) * * This function releases all allocated resources of the gendisk. * - * The struct gendisk refcount is incremented with get_gendisk() or - * get_disk_and_module(), and its refcount is decremented with - * put_disk_and_module() or put_disk(). Once the refcount reaches 0 this - * function is called. - * * Drivers which used __device_add_disk() have a gendisk with a request_queue * assigned. Since the request_queue sits on top of the gendisk for these * drivers we also call blk_put_queue() for them, and we expect the @@ -1748,16 +1603,17 @@ struct gendisk *__alloc_disk_node(int minors, int node_id) if (!disk) return NULL; + disk->part0.bdev = bdev_alloc(disk, 0); + if (!disk->part0.bdev) + goto out_free_disk; + disk->part0.dkstats = alloc_percpu(struct disk_stats); if (!disk->part0.dkstats) - goto out_free_disk; + goto out_bdput; - init_rwsem(&disk->lookup_sem); disk->node_id = node_id; - if (disk_expand_part_tbl(disk, 0)) { - free_percpu(disk->part0.dkstats); - goto out_free_disk; - } + if (disk_expand_part_tbl(disk, 0)) + goto out_free_bdstats; ptbl = rcu_dereference_protected(disk->part_tbl, 1); rcu_assign_pointer(ptbl->part[0], &disk->part0); @@ -1773,7 +1629,7 @@ struct gendisk *__alloc_disk_node(int minors, int node_id) */ hd_sects_seq_init(&disk->part0); if (hd_ref_init(&disk->part0)) - goto out_free_part0; + goto out_free_bdstats; disk->minors = minors; rand_initialize_disk(disk); @@ -1782,8 +1638,10 @@ struct gendisk *__alloc_disk_node(int minors, int node_id) device_initialize(disk_to_dev(disk)); return disk; -out_free_part0: - hd_free_part(&disk->part0); +out_free_bdstats: + free_percpu(disk->part0.dkstats); +out_bdput: + bdput(disk->part0.bdev); out_free_disk: kfree(disk); return NULL; @@ -1807,26 +1665,6 @@ void put_disk(struct gendisk *disk) } EXPORT_SYMBOL(put_disk); -/** - * put_disk_and_module - decrements the module and gendisk refcount - * @disk: the struct gendisk to decrement the refcount for - * - * This is a counterpart of get_disk_and_module() and thus also of - * get_gendisk(). - * - * Context: Any context, but the last reference must not be dropped from - * atomic context. - */ -void put_disk_and_module(struct gendisk *disk) -{ - if (disk) { - struct module *owner = disk->fops->owner; - - put_disk(disk); - module_put(owner); - } -} - static void set_disk_ro_uevent(struct gendisk *gd, int ro) { char event[] = "DISK_RO=1"; diff --git a/block/partitions/core.c b/block/partitions/core.c index a02e224115943d..696bd9ff63c64a 100644 --- a/block/partitions/core.c +++ b/block/partitions/core.c @@ -340,12 +340,11 @@ void delete_partition(struct hd_struct *part) device_del(part_to_dev(part)); /* - * Remove gendisk pointer from idr so that it cannot be looked up - * while RCU period before freeing gendisk is running to prevent - * use-after-free issues. Note that the device number stays - * "in-use" until we really free the gendisk. + * Remove the block device from the inode hash, so that it cannot be + * looked up any more even when openers still hold references. */ - blk_invalidate_devt(part_devt(part)); + remove_inode_hash(part->bdev->bd_inode); + percpu_ref_kill(&part->ref); } @@ -368,6 +367,7 @@ static struct hd_struct *add_partition(struct gendisk *disk, int partno, dev_t devt = MKDEV(0, 0); struct device *ddev = disk_to_dev(disk); struct device *pdev; + struct block_device *bdev; struct disk_part_tbl *ptbl; const char *dname; int err; @@ -402,11 +402,15 @@ static struct hd_struct *add_partition(struct gendisk *disk, int partno, if (!p) return ERR_PTR(-EBUSY); + err = -ENOMEM; p->dkstats = alloc_percpu(struct disk_stats); - if (!p->dkstats) { - err = -ENOMEM; + if (!p->dkstats) goto out_free; - } + + bdev = bdev_alloc(disk, partno); + if (!bdev) + goto out_free_stats; + p->bdev = bdev; hd_sects_seq_init(p); pdev = part_to_dev(p); @@ -420,10 +424,8 @@ static struct hd_struct *add_partition(struct gendisk *disk, int partno, struct partition_meta_info *pinfo; pinfo = kzalloc_node(sizeof(*pinfo), GFP_KERNEL, disk->node_id); - if (!pinfo) { - err = -ENOMEM; - goto out_free_stats; - } + if (!pinfo) + goto out_bdput; memcpy(pinfo, info, sizeof(*info)); p->info = pinfo; } @@ -470,6 +472,7 @@ static struct hd_struct *add_partition(struct gendisk *disk, int partno, } /* everything is up and running, commence */ + bdev_add(bdev, devt); rcu_assign_pointer(ptbl->part[partno], p); /* suppress uevent if the disk suppresses it */ @@ -479,6 +482,8 @@ static struct hd_struct *add_partition(struct gendisk *disk, int partno, out_free_info: kfree(p->info); +out_bdput: + bdput(bdev); out_free_stats: free_percpu(p->dkstats); out_free: diff --git a/fs/block_dev.c b/fs/block_dev.c index 03f06c1614152b..07b869c2ade501 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -863,31 +863,46 @@ void __init bdev_cache_init(void) blockdev_superblock = bd_mnt->mnt_sb; /* For writeback */ } -static struct block_device *bdget(dev_t dev) +struct block_device *bdev_alloc(struct gendisk *disk, u8 partno) { struct block_device *bdev; struct inode *inode; - inode = iget_locked(blockdev_superblock, dev); + inode = new_inode(blockdev_superblock); if (!inode) return NULL; + inode->i_mode = S_IFBLK; + inode->i_rdev = 0; + inode->i_data.a_ops = &def_blk_aops; + mapping_set_gfp_mask(&inode->i_data, GFP_USER); + + bdev = I_BDEV(inode); + spin_lock_init(&bdev->bd_size_lock); + bdev->bd_disk = disk; + bdev->bd_partno = partno; + bdev->bd_contains = NULL; + bdev->bd_super = NULL; + bdev->bd_inode = inode; + bdev->bd_part_count = 0; + return bdev; +} - bdev = &BDEV_I(inode)->bdev; +void bdev_add(struct block_device *bdev, dev_t dev) +{ + bdev->bd_dev = dev; + bdev->bd_inode->i_rdev = dev; + bdev->bd_inode->i_ino = dev; + insert_inode_hash(bdev->bd_inode); +} - if (inode->i_state & I_NEW) { - spin_lock_init(&bdev->bd_size_lock); - bdev->bd_contains = NULL; - bdev->bd_super = NULL; - bdev->bd_inode = inode; - bdev->bd_part_count = 0; - bdev->bd_dev = dev; - inode->i_mode = S_IFBLK; - inode->i_rdev = dev; - inode->i_data.a_ops = &def_blk_aops; - mapping_set_gfp_mask(&inode->i_data, GFP_USER); - unlock_new_inode(inode); - } - return bdev; +static struct block_device *bdget(dev_t dev) +{ + struct inode *inode; + + inode = ilookup(blockdev_superblock, dev); + if (!inode) + return NULL; + return &BDEV_I(inode)->bdev; } /** @@ -1000,27 +1015,6 @@ int bd_prepare_to_claim(struct block_device *bdev, struct block_device *whole, } EXPORT_SYMBOL_GPL(bd_prepare_to_claim); /* only for the loop driver */ -static struct gendisk *bdev_get_gendisk(struct block_device *bdev, int *partno) -{ - struct gendisk *disk = get_gendisk(bdev->bd_dev, partno); - - if (!disk) - return NULL; - /* - * Now that we hold gendisk reference we make sure bdev we looked up is - * not stale. If it is, it means device got removed and created before - * we looked up gendisk and we fail open in such case. Associating - * unhashed bdev with newly created gendisk could lead to two bdevs - * (and thus two independent caches) being associated with one device - * which is bad. - */ - if (inode_unhashed(bdev->bd_inode)) { - put_disk_and_module(disk); - return NULL; - } - return disk; -} - static void bd_clear_claiming(struct block_device *whole, void *holder) { lockdep_assert_held(&bdev_lock); @@ -1343,19 +1337,17 @@ EXPORT_SYMBOL_GPL(bdev_disk_changed); * mutex_lock(part->bd_mutex) * mutex_lock_nested(whole->bd_mutex, 1) */ -static int __blkdev_get(struct block_device *bdev, struct gendisk *disk, - int partno, fmode_t mode) +static int __blkdev_get(struct block_device *bdev, fmode_t mode) { + struct gendisk *disk = bdev->bd_disk; int ret; if (!bdev->bd_openers) { - bdev->bd_disk = disk; bdev->bd_contains = bdev; - bdev->bd_partno = partno; - if (!partno) { + if (!bdev->bd_partno) { ret = -ENXIO; - bdev->bd_part = disk_get_part(disk, partno); + bdev->bd_part = disk_get_part(disk, 0); if (!bdev->bd_part) goto out_clear; @@ -1384,7 +1376,7 @@ static int __blkdev_get(struct block_device *bdev, struct gendisk *disk, struct block_device *whole = bdget_disk(disk, 0); mutex_lock_nested(&whole->bd_mutex, 1); - ret = __blkdev_get(whole, disk, 0, mode); + ret = __blkdev_get(whole, mode); if (ret) { mutex_unlock(&whole->bd_mutex); bdput(whole); @@ -1394,9 +1386,8 @@ static int __blkdev_get(struct block_device *bdev, struct gendisk *disk, mutex_unlock(&whole->bd_mutex); bdev->bd_contains = whole; - bdev->bd_part = disk_get_part(disk, partno); - if (!(disk->flags & GENHD_FL_UP) || - !bdev->bd_part || !bdev->bd_part->nr_sects) { + bdev->bd_part = disk_get_part(disk, bdev->bd_partno); + if (!bdev->bd_part || !bdev->bd_part->nr_sects) { __blkdev_put(whole, mode, 1); bdput(whole); ret = -ENXIO; @@ -1426,12 +1417,51 @@ static int __blkdev_get(struct block_device *bdev, struct gendisk *disk, out_clear: disk_put_part(bdev->bd_part); - bdev->bd_disk = NULL; bdev->bd_part = NULL; bdev->bd_contains = NULL; return ret; } +struct block_device *blkdev_get_no_open(dev_t dev) +{ + struct block_device *bdev = bdget(dev); + struct gendisk *disk; + + down_read(&bdev_lookup_sem); + if (!bdev) { + up_read(&bdev_lookup_sem); + blk_request_module(dev); + down_read(&bdev_lookup_sem); + + bdev = bdget(dev); + if (!bdev) + return NULL; + } + + disk = bdev->bd_disk; + if (!kobject_get_unless_zero(&disk_to_dev(disk)->kobj)) + goto bdput; + if ((disk->flags & (GENHD_FL_UP | GENHD_FL_HIDDEN)) != GENHD_FL_UP) + goto bdput; + if (!try_module_get(bdev->bd_disk->fops->owner)) + goto put_disk; + up_read(&bdev_lookup_sem); + return bdev; +put_disk: + put_disk(disk); +bdput: + bdput(bdev); + up_read(&bdev_lookup_sem); + return NULL; +} + +void blkdev_put_no_open(struct block_device *bdev) +{ + module_put(bdev->bd_disk->fops->owner); + put_disk(bdev->bd_disk); + bdput(bdev); +} + /** * blkdev_get_by_dev - open a block device by device number * @dev: device number of block device to open @@ -1459,7 +1489,6 @@ struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder) bool unblock_events = true; struct block_device *bdev; struct gendisk *disk; - int partno; int ret; ret = devcgroup_check_permission(DEVCG_DEV_BLOCK, @@ -1469,18 +1498,14 @@ struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder) if (ret) return ERR_PTR(ret); - bdev = bdget(dev); - if (!bdev) - return ERR_PTR(-ENOMEM); - /* * If we lost a race with 'disk' being deleted, try again. See md.c. */ retry: - ret = -ENXIO; - disk = bdev_get_gendisk(bdev, &partno); - if (!disk) - goto bdput; + bdev = blkdev_get_no_open(dev); + if (!bdev) + return ERR_PTR(-ENXIO); + disk = bdev->bd_disk; if (mode & FMODE_EXCL) { WARN_ON_ONCE(!holder); @@ -1488,7 +1513,7 @@ struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder) ret = -ENOMEM; claiming = bdget_disk(disk, 0); if (!claiming) - goto put_disk; + goto put_blkdev; ret = bd_prepare_to_claim(bdev, claiming, holder); if (ret) goto put_claiming; @@ -1497,12 +1522,10 @@ struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder) disk_block_events(disk); mutex_lock(&bdev->bd_mutex); - ret =__blkdev_get(bdev, disk, partno, mode); - if (!(mode & FMODE_EXCL)) { - ; /* nothing to do here */ - } else if (ret) { - bd_abort_claiming(bdev, claiming, holder); - } else { + ret =__blkdev_get(bdev, mode); + if (ret) + goto abort_claiming; + if (mode & FMODE_EXCL) { bd_finish_claiming(bdev, claiming, holder); /* @@ -1522,21 +1545,23 @@ struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder) if (unblock_events) disk_unblock_events(disk); + if (mode & FMODE_EXCL) + bdput(claiming); + return bdev; +abort_claiming: + if (mode & FMODE_EXCL) + bd_abort_claiming(bdev, claiming, holder); + mutex_unlock(&bdev->bd_mutex); + disk_unblock_events(disk); put_claiming: if (mode & FMODE_EXCL) bdput(claiming); -put_disk: - if (ret) - put_disk_and_module(disk); +put_blkdev: + blkdev_put_no_open(bdev); if (ret == -ERESTARTSYS) goto retry; -bdput: - if (ret) { - bdput(bdev); - return ERR_PTR(ret); - } - return bdev; + return ERR_PTR(ret); } EXPORT_SYMBOL(blkdev_get_by_dev); @@ -1638,7 +1663,6 @@ static void __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part) disk_put_part(bdev->bd_part); bdev->bd_part = NULL; - bdev->bd_disk = NULL; if (bdev_is_partition(bdev)) victim = bdev->bd_contains; bdev->bd_contains = NULL; @@ -1696,12 +1720,10 @@ void blkdev_put(struct block_device *bdev, fmode_t mode) * from userland - e.g. eject(1). */ disk_flush_events(disk, DISK_EVENT_MEDIA_CHANGE); - mutex_unlock(&bdev->bd_mutex); __blkdev_put(bdev, mode, 0); - bdput(bdev); - put_disk_and_module(disk); + blkdev_put_no_open(bdev); } EXPORT_SYMBOL(blkdev_put); diff --git a/include/linux/blk-cgroup.h b/include/linux/blk-cgroup.h index c8fc9792ac776d..b9f3c246c3c908 100644 --- a/include/linux/blk-cgroup.h +++ b/include/linux/blk-cgroup.h @@ -197,12 +197,12 @@ void blkcg_print_blkgs(struct seq_file *sf, struct blkcg *blkcg, u64 __blkg_prfill_u64(struct seq_file *sf, struct blkg_policy_data *pd, u64 v); struct blkg_conf_ctx { - struct gendisk *disk; + struct block_device *bdev; struct blkcg_gq *blkg; char *body; }; -struct gendisk *blkcg_conf_get_disk(char **inputp); +struct block_device *blkcg_conf_open_bdev(char **inputp); int blkg_conf_prep(struct blkcg *blkcg, const struct blkcg_policy *pol, char *input, struct blkg_conf_ctx *ctx); void blkg_conf_finish(struct blkg_conf_ctx *ctx); diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index bdd7339bcda462..5d48b92f5e4348 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1994,6 +1994,12 @@ void bd_abort_claiming(struct block_device *bdev, struct block_device *whole, void *holder); void blkdev_put(struct block_device *bdev, fmode_t mode); +/* just for blk-cgroup, don't use elsewhere */ +struct block_device *blkdev_get_no_open(dev_t dev); +void blkdev_put_no_open(struct block_device *bdev); + +struct block_device *bdev_alloc(struct gendisk *disk, u8 partno); +void bdev_add(struct block_device *bdev, dev_t dev); struct block_device *I_BDEV(struct inode *inode); struct block_device *bdget_part(struct hd_struct *part); struct block_device *bdgrab(struct block_device *bdev); diff --git a/include/linux/genhd.h b/include/linux/genhd.h index ca5e356084c353..42a51653c7303e 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -65,6 +65,7 @@ struct hd_struct { struct disk_stats __percpu *dkstats; struct percpu_ref ref; + struct block_device *bdev; struct device __dev; struct kobject *holder_dir; int policy, partno; @@ -193,7 +194,6 @@ struct gendisk { int flags; unsigned long state; #define GD_NEED_PART_SCAN 0 - struct rw_semaphore lookup_sem; struct kobject *slave_dir; struct timer_rand_state *random; @@ -300,7 +300,6 @@ static inline void add_disk_no_queue_reg(struct gendisk *disk) } extern void del_gendisk(struct gendisk *gp); -extern struct gendisk *get_gendisk(dev_t dev, int *partno); extern struct block_device *bdget_disk(struct gendisk *disk, int partno); extern void set_disk_ro(struct gendisk *disk, int flag); @@ -338,7 +337,6 @@ int blk_drop_partitions(struct block_device *bdev); extern struct gendisk *__alloc_disk_node(int minors, int node_id); extern void put_disk(struct gendisk *disk); -extern void put_disk_and_module(struct gendisk *disk); #define alloc_disk_node(minors, node_id) \ ({ \ @@ -388,7 +386,10 @@ static inline void bd_unlink_disk_holder(struct block_device *bdev, } #endif /* CONFIG_SYSFS */ +extern struct rw_semaphore bdev_lookup_sem; + dev_t blk_lookup_devt(const char *name, int partno); +void blk_request_module(dev_t devt); #ifdef CONFIG_BLOCK void printk_all_partitions(void); #else /* CONFIG_BLOCK */ From patchwork Thu Nov 26 13:04:03 2020 Content-Type: text/plain; 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Received: from [2001:4bb8:18c:1dd6:27b8:b8a1:c13e:ceb1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGzM-00043O-Af; Thu, 26 Nov 2020 13:07:08 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , dm-devel@redhat.com, Jan Kara , linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 25/44] block: remove ->bd_contains Date: Thu, 26 Nov 2020 14:04:03 +0100 Message-Id: <20201126130422.92945-26-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201126130422.92945-1-hch@lst.de> References: <20201126130422.92945-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Now that each hd_struct has a reference to the corresponding block_device, there is no need for the bd_contains pointer. Add a bdev_whole() helper to look up the whole device block_device struture instead. Signed-off-by: Christoph Hellwig Reviewed-by: Greg Kroah-Hartman Reviewed-by: Jan Kara Acked-by: Tejun Heo --- drivers/block/loop.c | 2 +- drivers/scsi/scsicam.c | 2 +- fs/block_dev.c | 22 ++++++++-------------- include/linux/blk_types.h | 4 +++- 4 files changed, 13 insertions(+), 17 deletions(-) diff --git a/drivers/block/loop.c b/drivers/block/loop.c index 26c7aafba7c5f8..c0df88b3300c41 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -1088,7 +1088,7 @@ static int loop_configure(struct loop_device *lo, fmode_t mode, * here to avoid changing device under exclusive owner. */ if (!(mode & FMODE_EXCL)) { - claimed_bdev = bdev->bd_contains; + claimed_bdev = bdev_whole(bdev); error = bd_prepare_to_claim(bdev, claimed_bdev, loop_configure); if (error) goto out_putf; diff --git a/drivers/scsi/scsicam.c b/drivers/scsi/scsicam.c index 682cf08ab04153..f1553a453616fd 100644 --- a/drivers/scsi/scsicam.c +++ b/drivers/scsi/scsicam.c @@ -32,7 +32,7 @@ */ unsigned char *scsi_bios_ptable(struct block_device *dev) { - struct address_space *mapping = dev->bd_contains->bd_inode->i_mapping; + struct address_space *mapping = bdev_whole(dev)->bd_inode->i_mapping; unsigned char *res = NULL; struct page *page; diff --git a/fs/block_dev.c b/fs/block_dev.c index 07b869c2ade501..73f45ae1d3d50c 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -119,7 +119,7 @@ int truncate_bdev_range(struct block_device *bdev, fmode_t mode, * under live filesystem. */ if (!(mode & FMODE_EXCL)) { - claimed_bdev = bdev->bd_contains; + claimed_bdev = bdev_whole(bdev); err = bd_prepare_to_claim(bdev, claimed_bdev, truncate_bdev_range); if (err) @@ -880,7 +880,6 @@ struct block_device *bdev_alloc(struct gendisk *disk, u8 partno) spin_lock_init(&bdev->bd_size_lock); bdev->bd_disk = disk; bdev->bd_partno = partno; - bdev->bd_contains = NULL; bdev->bd_super = NULL; bdev->bd_inode = inode; bdev->bd_part_count = 0; @@ -1343,9 +1342,7 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode) int ret; if (!bdev->bd_openers) { - bdev->bd_contains = bdev; - - if (!bdev->bd_partno) { + if (!bdev_is_partition(bdev)) { ret = -ENXIO; bdev->bd_part = disk_get_part(disk, 0); if (!bdev->bd_part) @@ -1385,7 +1382,6 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode) whole->bd_part_count++; mutex_unlock(&whole->bd_mutex); - bdev->bd_contains = whole; bdev->bd_part = disk_get_part(disk, bdev->bd_partno); if (!bdev->bd_part || !bdev->bd_part->nr_sects) { __blkdev_put(whole, mode, 1); @@ -1400,7 +1396,7 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode) if (bdev->bd_bdi == &noop_backing_dev_info) bdev->bd_bdi = bdi_get(disk->queue->backing_dev_info); } else { - if (bdev->bd_contains == bdev) { + if (!bdev_is_partition(bdev)) { ret = 0; if (bdev->bd_disk->fops->open) ret = bdev->bd_disk->fops->open(bdev, mode); @@ -1418,7 +1414,6 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode) out_clear: disk_put_part(bdev->bd_part); bdev->bd_part = NULL; - bdev->bd_contains = NULL; return ret; } @@ -1664,8 +1659,7 @@ static void __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part) disk_put_part(bdev->bd_part); bdev->bd_part = NULL; if (bdev_is_partition(bdev)) - victim = bdev->bd_contains; - bdev->bd_contains = NULL; + victim = bdev_whole(bdev); } else { if (!bdev_is_partition(bdev) && disk->fops->release) disk->fops->release(disk, mode); @@ -1684,6 +1678,7 @@ void blkdev_put(struct block_device *bdev, fmode_t mode) mutex_lock(&bdev->bd_mutex); if (mode & FMODE_EXCL) { + struct block_device *whole = bdev_whole(bdev); bool bdev_free; /* @@ -1694,13 +1689,12 @@ void blkdev_put(struct block_device *bdev, fmode_t mode) spin_lock(&bdev_lock); WARN_ON_ONCE(--bdev->bd_holders < 0); - WARN_ON_ONCE(--bdev->bd_contains->bd_holders < 0); + WARN_ON_ONCE(--whole->bd_holders < 0); - /* bd_contains might point to self, check in a separate step */ if ((bdev_free = !bdev->bd_holders)) bdev->bd_holder = NULL; - if (!bdev->bd_contains->bd_holders) - bdev->bd_contains->bd_holder = NULL; + if (!whole->bd_holders) + whole->bd_holder = NULL; spin_unlock(&bdev_lock); diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h index 9698f459cc65c9..2e0a9bd9688d28 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -32,7 +32,6 @@ struct block_device { #ifdef CONFIG_SYSFS struct list_head bd_holder_disks; #endif - struct block_device * bd_contains; u8 bd_partno; struct hd_struct * bd_part; /* number of times partitions within this device have been opened. */ @@ -49,6 +48,9 @@ struct block_device { struct super_block *bd_fsfreeze_sb; } __randomize_layout; +#define bdev_whole(_bdev) \ + ((_bdev)->bd_disk->part0.bdev) + #define bdev_kobj(_bdev) \ (&part_to_dev((_bdev)->bd_part)->kobj) From patchwork Thu Nov 26 13:04:04 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11933531 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 84D95C63697 for ; 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bh=yfOmHITfcmrnqqH2mTFIs2gex5rvDz6ddqSrV3AiET0=; b=NMV1mshqul/Oud+p60vEs+VE0p o7Qst0ZFTy6wPe6H5OvWgcxVgVScZ1iZUi8ckr3mSDgDpONWHd7vNCqRrGh2ZmvUjtu9YrFRWnEfb DIACGJCnZB5f1zWW0B9/+snJ2nNXMdIcPeAJf0p8I8ibdF1HSWAlDT1na8+hKIrd2Uvz1zVzHCTN9 Fqs4h9iuwKNPX+dDYVDVDw/3MxdbwiObHwTqY0DM1Q2ZEb/eQnGQP3+qD4Cj3AjWYXZuRKAA4sttg fUwulEoxgHx5kI4IgGfc7V18741CIxeX137t1b3lnD+FP8dT5dQ1JsNc4lHyQ4lPtAXXcLCQ8Q2hK yTj8uIkw==; Received: from [2001:4bb8:18c:1dd6:27b8:b8a1:c13e:ceb1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGzN-00043l-V4; Thu, 26 Nov 2020 13:07:10 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , dm-devel@redhat.com, Jan Kara , linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 26/44] block: simplify the block device claiming interface Date: Thu, 26 Nov 2020 14:04:04 +0100 Message-Id: <20201126130422.92945-27-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201126130422.92945-1-hch@lst.de> References: <20201126130422.92945-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Stop passing the whole device as a separate argument given that it can be trivially deducted and cleanup the !holder debug check. Signed-off-by: Christoph Hellwig Reviewed-by: Greg Kroah-Hartman Reviewed-by: Jan Kara Acked-by: Tejun Heo --- drivers/block/loop.c | 12 +++++----- fs/block_dev.c | 51 +++++++++++++++--------------------------- include/linux/blkdev.h | 6 ++--- 3 files changed, 25 insertions(+), 44 deletions(-) diff --git a/drivers/block/loop.c b/drivers/block/loop.c index c0df88b3300c41..d643c67be6acea 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -1069,7 +1069,6 @@ static int loop_configure(struct loop_device *lo, fmode_t mode, struct file *file; struct inode *inode; struct address_space *mapping; - struct block_device *claimed_bdev = NULL; int error; loff_t size; bool partscan; @@ -1088,8 +1087,7 @@ static int loop_configure(struct loop_device *lo, fmode_t mode, * here to avoid changing device under exclusive owner. */ if (!(mode & FMODE_EXCL)) { - claimed_bdev = bdev_whole(bdev); - error = bd_prepare_to_claim(bdev, claimed_bdev, loop_configure); + error = bd_prepare_to_claim(bdev, loop_configure); if (error) goto out_putf; } @@ -1176,15 +1174,15 @@ static int loop_configure(struct loop_device *lo, fmode_t mode, mutex_unlock(&loop_ctl_mutex); if (partscan) loop_reread_partitions(lo, bdev); - if (claimed_bdev) - bd_abort_claiming(bdev, claimed_bdev, loop_configure); + if (!(mode & FMODE_EXCL)) + bd_abort_claiming(bdev, loop_configure); return 0; out_unlock: mutex_unlock(&loop_ctl_mutex); out_bdev: - if (claimed_bdev) - bd_abort_claiming(bdev, claimed_bdev, loop_configure); + if (!(mode & FMODE_EXCL)) + bd_abort_claiming(bdev, loop_configure); out_putf: fput(file); out: diff --git a/fs/block_dev.c b/fs/block_dev.c index 73f45ae1d3d50c..f180ac0e87844f 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -110,24 +110,20 @@ EXPORT_SYMBOL(invalidate_bdev); int truncate_bdev_range(struct block_device *bdev, fmode_t mode, loff_t lstart, loff_t lend) { - struct block_device *claimed_bdev = NULL; - int err; - /* * If we don't hold exclusive handle for the device, upgrade to it * while we discard the buffer cache to avoid discarding buffers * under live filesystem. */ if (!(mode & FMODE_EXCL)) { - claimed_bdev = bdev_whole(bdev); - err = bd_prepare_to_claim(bdev, claimed_bdev, - truncate_bdev_range); + int err = bd_prepare_to_claim(bdev, truncate_bdev_range); if (err) return err; } + truncate_inode_pages_range(bdev->bd_inode->i_mapping, lstart, lend); - if (claimed_bdev) - bd_abort_claiming(bdev, claimed_bdev, truncate_bdev_range); + if (!(mode & FMODE_EXCL)) + bd_abort_claiming(bdev, truncate_bdev_range); return 0; } EXPORT_SYMBOL(truncate_bdev_range); @@ -974,7 +970,6 @@ static bool bd_may_claim(struct block_device *bdev, struct block_device *whole, /** * bd_prepare_to_claim - claim a block device * @bdev: block device of interest - * @whole: the whole device containing @bdev, may equal @bdev * @holder: holder trying to claim @bdev * * Claim @bdev. This function fails if @bdev is already claimed by another @@ -984,9 +979,12 @@ static bool bd_may_claim(struct block_device *bdev, struct block_device *whole, * RETURNS: * 0 if @bdev can be claimed, -EBUSY otherwise. */ -int bd_prepare_to_claim(struct block_device *bdev, struct block_device *whole, - void *holder) +int bd_prepare_to_claim(struct block_device *bdev, void *holder) { + struct block_device *whole = bdev_whole(bdev); + + if (WARN_ON_ONCE(!holder)) + return -EINVAL; retry: spin_lock(&bdev_lock); /* if someone else claimed, fail */ @@ -1026,15 +1024,15 @@ static void bd_clear_claiming(struct block_device *whole, void *holder) /** * bd_finish_claiming - finish claiming of a block device * @bdev: block device of interest - * @whole: whole block device * @holder: holder that has claimed @bdev * * Finish exclusive open of a block device. Mark the device as exlusively * open by the holder and wake up all waiters for exclusive open to finish. */ -static void bd_finish_claiming(struct block_device *bdev, - struct block_device *whole, void *holder) +static void bd_finish_claiming(struct block_device *bdev, void *holder) { + struct block_device *whole = bdev_whole(bdev); + spin_lock(&bdev_lock); BUG_ON(!bd_may_claim(bdev, whole, holder)); /* @@ -1059,11 +1057,10 @@ static void bd_finish_claiming(struct block_device *bdev, * also used when exclusive open is not actually desired and we just needed * to block other exclusive openers for a while. */ -void bd_abort_claiming(struct block_device *bdev, struct block_device *whole, - void *holder) +void bd_abort_claiming(struct block_device *bdev, void *holder) { spin_lock(&bdev_lock); - bd_clear_claiming(whole, holder); + bd_clear_claiming(bdev_whole(bdev), holder); spin_unlock(&bdev_lock); } EXPORT_SYMBOL(bd_abort_claiming); @@ -1480,7 +1477,6 @@ void blkdev_put_no_open(struct block_device *bdev) */ struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder) { - struct block_device *claiming; bool unblock_events = true; struct block_device *bdev; struct gendisk *disk; @@ -1503,15 +1499,9 @@ struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder) disk = bdev->bd_disk; if (mode & FMODE_EXCL) { - WARN_ON_ONCE(!holder); - - ret = -ENOMEM; - claiming = bdget_disk(disk, 0); - if (!claiming) - goto put_blkdev; - ret = bd_prepare_to_claim(bdev, claiming, holder); + ret = bd_prepare_to_claim(bdev, holder); if (ret) - goto put_claiming; + goto put_blkdev; } disk_block_events(disk); @@ -1521,7 +1511,7 @@ struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder) if (ret) goto abort_claiming; if (mode & FMODE_EXCL) { - bd_finish_claiming(bdev, claiming, holder); + bd_finish_claiming(bdev, holder); /* * Block event polling for write claims if requested. Any write @@ -1540,18 +1530,13 @@ struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder) if (unblock_events) disk_unblock_events(disk); - if (mode & FMODE_EXCL) - bdput(claiming); return bdev; abort_claiming: if (mode & FMODE_EXCL) - bd_abort_claiming(bdev, claiming, holder); + bd_abort_claiming(bdev, holder); mutex_unlock(&bdev->bd_mutex); disk_unblock_events(disk); -put_claiming: - if (mode & FMODE_EXCL) - bdput(claiming); put_blkdev: blkdev_put_no_open(bdev); if (ret == -ERESTARTSYS) diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 5d48b92f5e4348..43a25d855e049a 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1988,10 +1988,8 @@ void blkdev_show(struct seq_file *seqf, off_t offset); struct block_device *blkdev_get_by_path(const char *path, fmode_t mode, void *holder); struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder); -int bd_prepare_to_claim(struct block_device *bdev, struct block_device *whole, - void *holder); -void bd_abort_claiming(struct block_device *bdev, struct block_device *whole, - void *holder); +int bd_prepare_to_claim(struct block_device *bdev, void *holder); +void bd_abort_claiming(struct block_device *bdev, void *holder); void blkdev_put(struct block_device *bdev, fmode_t mode); /* just for blk-cgroup, don't use elsewhere */ From patchwork Thu Nov 26 13:04:05 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11933529 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D7C89C64E7D for ; Thu, 26 Nov 2020 13:07:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8AFB4221E9 for ; Thu, 26 Nov 2020 13:07:28 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="tFjT6IkZ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389971AbgKZNHZ (ORCPT ); Thu, 26 Nov 2020 08:07:25 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53144 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389978AbgKZNHX (ORCPT ); Thu, 26 Nov 2020 08:07:23 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 85EF3C0613D4; Thu, 26 Nov 2020 05:07:23 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=7zJyA1+2dNtOVgFSOqRhBotQ/SGMaZPnGEludQAyDbM=; b=tFjT6IkZrllK1gCvx3sgLP9AIc OTjjaMfxu6Sr78eemKDudzxtJJ4WjsR32/1co/MX6KOHwzotcSZYQYFPChzT/4mkYwOqXV25Bcy+Y F+TiUT40riLcGeEXWkICD1YeOY0nPbUjgMfvQu6e7MfqeIZt3D/MHYQNWnos3sFcB/QTxugA73GvE bOBLPOUzeJ0hUQbECYWpjJijnkOXoRKZ4Sk3RrxllMGrBs7EmljV3+Y/0SAggChY5UdJjfy+oEncL t+l+Fo13Rr6SDL7fUpjTgkjRc/PT6UI1K0Ul/QrCTxzFl5uu22GSDh78VVi27hK/Bagqt9iF6YsoN 2JG9EfAQ==; Received: from [2001:4bb8:18c:1dd6:27b8:b8a1:c13e:ceb1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGzP-000443-4a; Thu, 26 Nov 2020 13:07:11 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , dm-devel@redhat.com, Jan Kara , linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 27/44] block: simplify part_to_disk Date: Thu, 26 Nov 2020 14:04:05 +0100 Message-Id: <20201126130422.92945-28-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201126130422.92945-1-hch@lst.de> References: <20201126130422.92945-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Now that struct hd_struct has a block_device pointer use that to find the disk. Signed-off-by: Christoph Hellwig Acked-by: Tejun Heo Reviewed-by: Jan Kara --- include/linux/genhd.h | 10 +++------- 1 file changed, 3 insertions(+), 7 deletions(-) diff --git a/include/linux/genhd.h b/include/linux/genhd.h index 42a51653c7303e..6ba91ee54cb2f6 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -218,13 +218,9 @@ struct gendisk { static inline struct gendisk *part_to_disk(struct hd_struct *part) { - if (likely(part)) { - if (part->partno) - return dev_to_disk(part_to_dev(part)->parent); - else - return dev_to_disk(part_to_dev(part)); - } - return NULL; + if (unlikely(!part)) + return NULL; + return part->bdev->bd_disk; } static inline int disk_max_parts(struct gendisk *disk) From patchwork Thu Nov 26 13:04:06 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11933537 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E935FC8302D for ; Thu, 26 Nov 2020 13:07:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A2716221F1 for ; Thu, 26 Nov 2020 13:07:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="MQmIXKif" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389992AbgKZNHZ (ORCPT ); Thu, 26 Nov 2020 08:07:25 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53148 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389982AbgKZNHY (ORCPT ); Thu, 26 Nov 2020 08:07:24 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 48AE7C0613D4; Thu, 26 Nov 2020 05:07:24 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=tTzT8jq2JcyLxT+MVTv6IpSRH5wR3ADhzhpNBZQZp9A=; b=MQmIXKifz0KnTEIu7IEqIGZAjZ 0XBYWs2SAQyChCu395vtRAVsj/re3eaOi/QBvDSAf9psqAsgo74Pf2LS6Q7WPQNJx15BMKG58tLW8 QzhlOD99YeD8TVIb1aMUEXLQJuS5b2J7sNRDL+ufV2WeuvYwq7FGQqpBnmqXafhkhi5tiTEQlI9tR 0uEQd6SVwBwBjGR7GunTUdnxjvZG/WOId3d3MmtCgRNuvTIhhSYlEsSrfumK/53T5+8lWuvjfou4O wjP6L9mQU2DFzSU0nfeVthDDJk1YF8HTgY1jQekup7mN3j1YDZ23KrrA7bXQlu9v0+4vZDe1ecvPJ S35gY1cA==; Received: from [2001:4bb8:18c:1dd6:27b8:b8a1:c13e:ceb1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGzQ-00044E-Kl; Thu, 26 Nov 2020 13:07:13 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , dm-devel@redhat.com, Jan Kara , linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 28/44] block: initialize struct block_device in bdev_alloc Date: Thu, 26 Nov 2020 14:04:06 +0100 Message-Id: <20201126130422.92945-29-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201126130422.92945-1-hch@lst.de> References: <20201126130422.92945-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Don't play tricks with slab constructors as bdev structures tends to not get reused very much, and this makes the code a lot less error prone. Signed-off-by: Christoph Hellwig Acked-by: Tejun Heo Reviewed-by: Jan Kara --- fs/block_dev.c | 22 +++++++++------------- 1 file changed, 9 insertions(+), 13 deletions(-) diff --git a/fs/block_dev.c b/fs/block_dev.c index f180ac0e87844f..58e8532d8580a1 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -784,20 +784,11 @@ static void bdev_free_inode(struct inode *inode) kmem_cache_free(bdev_cachep, BDEV_I(inode)); } -static void init_once(void *foo) +static void init_once(void *data) { - struct bdev_inode *ei = (struct bdev_inode *) foo; - struct block_device *bdev = &ei->bdev; + struct bdev_inode *ei = data; - memset(bdev, 0, sizeof(*bdev)); - mutex_init(&bdev->bd_mutex); -#ifdef CONFIG_SYSFS - INIT_LIST_HEAD(&bdev->bd_holder_disks); -#endif - bdev->bd_bdi = &noop_backing_dev_info; inode_init_once(&ei->vfs_inode); - /* Initialize mutex for freeze. */ - mutex_init(&bdev->bd_fsfreeze_mutex); } static void bdev_evict_inode(struct inode *inode) @@ -873,12 +864,17 @@ struct block_device *bdev_alloc(struct gendisk *disk, u8 partno) mapping_set_gfp_mask(&inode->i_data, GFP_USER); bdev = I_BDEV(inode); + memset(bdev, 0, sizeof(*bdev)); + mutex_init(&bdev->bd_mutex); + mutex_init(&bdev->bd_fsfreeze_mutex); spin_lock_init(&bdev->bd_size_lock); bdev->bd_disk = disk; bdev->bd_partno = partno; - bdev->bd_super = NULL; bdev->bd_inode = inode; - bdev->bd_part_count = 0; + bdev->bd_bdi = &noop_backing_dev_info; +#ifdef CONFIG_SYSFS + INIT_LIST_HEAD(&bdev->bd_holder_disks); +#endif return bdev; } From patchwork Thu Nov 26 13:04:07 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11933573 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6A02AC83030 for ; Thu, 26 Nov 2020 13:07:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2760C221F8 for ; Thu, 26 Nov 2020 13:07:33 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="t0E/ZjWH" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389996AbgKZNHc (ORCPT ); Thu, 26 Nov 2020 08:07:32 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53150 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389989AbgKZNHY (ORCPT ); Thu, 26 Nov 2020 08:07:24 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 78BFFC0617A7; Thu, 26 Nov 2020 05:07:24 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=FD2AUpgZKduS2hXetPTu7TbxpOwDIaKHbRNx+Oy1KRo=; b=t0E/ZjWH+lS7/pbdJ/d1dlTcUU NC6c4nSsefCOWJ3A8X//RtqXxjZwD4ccm5apqbDD+eRIYu08NY+CcJXHtFzy0vXZO+ob9ulGdsCzr IwPDJMq6R0YDG8bqym7k6yQPBbsIhgFE3qRryBKUqMxqv9lW3UE2k3K4z2v7j09QzKPgYCyzHpqRo uvt4iQ5IoMXjlfKgcNunz22VuD3hWGzxXwjXUO49H+dkYEICLt/FM4fEslqXTiRqtmAekB22PbU21 0kLCx2TzAMSFOcObNhEVVFJUpWF4gZO3zJqTKQgdvBbgN1jUfUubpHqmASiWVd0jS2NFSP4zN3THb lXwRF3uw==; Received: from [2001:4bb8:18c:1dd6:27b8:b8a1:c13e:ceb1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGzS-00044x-4z; Thu, 26 Nov 2020 13:07:14 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , dm-devel@redhat.com, Jan Kara , linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, Chao Yu Subject: [PATCH 29/44] block: remove the nr_sects field in struct hd_struct Date: Thu, 26 Nov 2020 14:04:07 +0100 Message-Id: <20201126130422.92945-30-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201126130422.92945-1-hch@lst.de> References: <20201126130422.92945-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Now that the hd_struct always has a block device attached to it, there is no need for having two size field that just get out of sync. Additional the field in hd_struct did not use proper serializiation, possibly allowing for torn writes. By only using the block_device field this problem also gets fixed. Signed-off-by: Christoph Hellwig Reviewed-by: Greg Kroah-Hartman Acked-by: Coly Li [bcache] Acked-by: Chao Yu [f2fs] --- block/bio.c | 4 +- block/blk-core.c | 2 +- block/blk.h | 53 ---------------------- block/genhd.c | 55 +++++++++++----------- block/partitions/core.c | 17 ++++--- drivers/block/loop.c | 1 - drivers/block/nbd.c | 2 +- drivers/block/xen-blkback/common.h | 4 +- drivers/md/bcache/super.c | 2 +- drivers/s390/block/dasd_ioctl.c | 4 +- drivers/target/target_core_pscsi.c | 7 +-- fs/block_dev.c | 73 +----------------------------- fs/f2fs/super.c | 2 +- fs/pstore/blk.c | 2 +- include/linux/genhd.h | 29 +++--------- kernel/trace/blktrace.c | 2 +- 16 files changed, 60 insertions(+), 199 deletions(-) diff --git a/block/bio.c b/block/bio.c index fa01bef35bb1fe..669bb47a31988e 100644 --- a/block/bio.c +++ b/block/bio.c @@ -613,8 +613,8 @@ void guard_bio_eod(struct bio *bio) rcu_read_lock(); part = __disk_get_part(bio->bi_disk, bio->bi_partno); if (part) - maxsector = part_nr_sects_read(part); - else + maxsector = bdev_nr_sectors(part->bdev); + else maxsector = get_capacity(bio->bi_disk); rcu_read_unlock(); diff --git a/block/blk-core.c b/block/blk-core.c index 2db8bda43b6e6d..988f45094a387b 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -755,7 +755,7 @@ static inline int blk_partition_remap(struct bio *bio) goto out; if (bio_sectors(bio)) { - if (bio_check_eod(bio, part_nr_sects_read(p))) + if (bio_check_eod(bio, bdev_nr_sectors(p->bdev))) goto out; bio->bi_iter.bi_sector += p->start_sect; trace_block_bio_remap(bio->bi_disk->queue, bio, part_devt(p), diff --git a/block/blk.h b/block/blk.h index c4839abcfa27eb..09cee7024fb43e 100644 --- a/block/blk.h +++ b/block/blk.h @@ -387,59 +387,6 @@ static inline void hd_free_part(struct hd_struct *part) percpu_ref_exit(&part->ref); } -/* - * Any access of part->nr_sects which is not protected by partition - * bd_mutex or gendisk bdev bd_mutex, should be done using this - * accessor function. - * - * Code written along the lines of i_size_read() and i_size_write(). - * CONFIG_PREEMPTION case optimizes the case of UP kernel with preemption - * on. - */ -static inline sector_t part_nr_sects_read(struct hd_struct *part) -{ -#if BITS_PER_LONG==32 && defined(CONFIG_SMP) - sector_t nr_sects; - unsigned seq; - do { - seq = read_seqcount_begin(&part->nr_sects_seq); - nr_sects = part->nr_sects; - } while (read_seqcount_retry(&part->nr_sects_seq, seq)); - return nr_sects; -#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPTION) - sector_t nr_sects; - - preempt_disable(); - nr_sects = part->nr_sects; - preempt_enable(); - return nr_sects; -#else - return part->nr_sects; -#endif -} - -/* - * Should be called with mutex lock held (typically bd_mutex) of partition - * to provide mutual exlusion among writers otherwise seqcount might be - * left in wrong state leaving the readers spinning infinitely. - */ -static inline void part_nr_sects_write(struct hd_struct *part, sector_t size) -{ -#if BITS_PER_LONG==32 && defined(CONFIG_SMP) - preempt_disable(); - write_seqcount_begin(&part->nr_sects_seq); - part->nr_sects = size; - write_seqcount_end(&part->nr_sects_seq); - preempt_enable(); -#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPTION) - preempt_disable(); - part->nr_sects = size; - preempt_enable(); -#else - part->nr_sects = size; -#endif -} - int bio_add_hw_page(struct request_queue *q, struct bio *bio, struct page *page, unsigned int len, unsigned int offset, unsigned int max_sectors, bool *same_page); diff --git a/block/genhd.c b/block/genhd.c index bf8fa82f135f4e..c6016fde4725b0 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -40,6 +40,16 @@ static void disk_add_events(struct gendisk *disk); static void disk_del_events(struct gendisk *disk); static void disk_release_events(struct gendisk *disk); +void set_capacity(struct gendisk *disk, sector_t sectors) +{ + struct block_device *bdev = disk->part0.bdev; + + spin_lock(&bdev->bd_size_lock); + i_size_write(bdev->bd_inode, (loff_t)sectors << SECTOR_SHIFT); + spin_unlock(&bdev->bd_size_lock); +} +EXPORT_SYMBOL(set_capacity); + /* * Set disk capacity and notify if the size is not currently zero and will not * be set to zero. Returns true if a uevent was sent, otherwise false. @@ -47,18 +57,22 @@ static void disk_release_events(struct gendisk *disk); bool set_capacity_and_notify(struct gendisk *disk, sector_t size) { sector_t capacity = get_capacity(disk); + char *envp[] = { "RESIZE=1", NULL }; set_capacity(disk, size); - revalidate_disk_size(disk, true); - - if (capacity != size && capacity != 0 && size != 0) { - char *envp[] = { "RESIZE=1", NULL }; - - kobject_uevent_env(&disk_to_dev(disk)->kobj, KOBJ_CHANGE, envp); - return true; - } - return false; + /* + * Only print a message and send a uevent if the gendisk is user visible + * and alive. This avoids spamming the log and udev when setting the + * initial capacity during probing. + */ + if (size == capacity || + (disk->flags & (GENHD_FL_UP | GENHD_FL_HIDDEN)) != GENHD_FL_UP) + return false; + pr_info("%s: detected capacity change from %lld to %lld\n", + disk->disk_name, size, capacity); + kobject_uevent_env(&disk_to_dev(disk)->kobj, KOBJ_CHANGE, envp); + return true; } EXPORT_SYMBOL_GPL(set_capacity_and_notify); @@ -247,7 +261,7 @@ struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter) part = rcu_dereference(ptbl->part[piter->idx]); if (!part) continue; - if (!part_nr_sects_read(part) && + if (!bdev_nr_sectors(part->bdev) && !(piter->flags & DISK_PITER_INCL_EMPTY) && !(piter->flags & DISK_PITER_INCL_EMPTY_PART0 && piter->idx == 0)) @@ -284,7 +298,7 @@ EXPORT_SYMBOL_GPL(disk_part_iter_exit); static inline int sector_in_part(struct hd_struct *part, sector_t sector) { return part->start_sect <= sector && - sector < part->start_sect + part_nr_sects_read(part); + sector < part->start_sect + bdev_nr_sectors(part->bdev); } /** @@ -986,8 +1000,8 @@ void __init printk_all_partitions(void) printk("%s%s %10llu %s %s", is_part0 ? "" : " ", bdevt_str(part_devt(part), devt_buf), - (unsigned long long)part_nr_sects_read(part) >> 1 - , disk_name(disk, part->partno, name_buf), + bdev_nr_sectors(part->bdev) >> 1, + disk_name(disk, part->partno, name_buf), part->info ? part->info->uuid : ""); if (is_part0) { if (dev->parent && dev->parent->driver) @@ -1079,7 +1093,7 @@ static int show_partition(struct seq_file *seqf, void *v) while ((part = disk_part_iter_next(&piter))) seq_printf(seqf, "%4d %7d %10llu %s\n", MAJOR(part_devt(part)), MINOR(part_devt(part)), - (unsigned long long)part_nr_sects_read(part) >> 1, + bdev_nr_sectors(part->bdev) >> 1, disk_name(sgp, part->partno, buf)); disk_part_iter_exit(&piter); @@ -1161,8 +1175,7 @@ ssize_t part_size_show(struct device *dev, { struct hd_struct *p = dev_to_part(dev); - return sprintf(buf, "%llu\n", - (unsigned long long)part_nr_sects_read(p)); + return sprintf(buf, "%llu\n", bdev_nr_sectors(p->bdev)); } ssize_t part_stat_show(struct device *dev, @@ -1618,16 +1631,6 @@ struct gendisk *__alloc_disk_node(int minors, int node_id) ptbl = rcu_dereference_protected(disk->part_tbl, 1); rcu_assign_pointer(ptbl->part[0], &disk->part0); - /* - * set_capacity() and get_capacity() currently don't use - * seqcounter to read/update the part0->nr_sects. Still init - * the counter as we can read the sectors in IO submission - * patch using seqence counters. - * - * TODO: Ideally set_capacity() and get_capacity() should be - * converted to make use of bd_mutex and sequence counters. - */ - hd_sects_seq_init(&disk->part0); if (hd_ref_init(&disk->part0)) goto out_free_bdstats; diff --git a/block/partitions/core.c b/block/partitions/core.c index 696bd9ff63c64a..bcfa8215bd5ef3 100644 --- a/block/partitions/core.c +++ b/block/partitions/core.c @@ -85,6 +85,13 @@ static int (*check_part[])(struct parsed_partitions *) = { NULL }; +static void bdev_set_nr_sectors(struct block_device *bdev, sector_t sectors) +{ + spin_lock(&bdev->bd_size_lock); + i_size_write(bdev->bd_inode, (loff_t)sectors << SECTOR_SHIFT); + spin_unlock(&bdev->bd_size_lock); +} + static struct parsed_partitions *allocate_partitions(struct gendisk *hd) { struct parsed_partitions *state; @@ -295,7 +302,7 @@ static void hd_struct_free_work(struct work_struct *work) put_device(disk_to_dev(disk)); part->start_sect = 0; - part->nr_sects = 0; + bdev_set_nr_sectors(part->bdev, 0); part_stat_set_all(part, 0); put_device(part_to_dev(part)); } @@ -412,11 +419,10 @@ static struct hd_struct *add_partition(struct gendisk *disk, int partno, goto out_free_stats; p->bdev = bdev; - hd_sects_seq_init(p); pdev = part_to_dev(p); p->start_sect = start; - p->nr_sects = len; + bdev_set_nr_sectors(bdev, len); p->partno = partno; p->policy = get_disk_ro(disk); @@ -509,7 +515,7 @@ static bool partition_overlaps(struct gendisk *disk, sector_t start, disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY); while ((part = disk_part_iter_next(&piter))) { if (part->partno == skip_partno || - start >= part->start_sect + part->nr_sects || + start >= part->start_sect + bdev_nr_sectors(part->bdev) || start + length <= part->start_sect) continue; overlap = true; @@ -600,8 +606,7 @@ int bdev_resize_partition(struct block_device *bdev, int partno, if (partition_overlaps(bdev->bd_disk, start, length, partno)) goto out_unlock; - part_nr_sects_write(part, length); - bd_set_nr_sectors(bdevp, length); + bdev_set_nr_sectors(bdevp, length); ret = 0; out_unlock: diff --git a/drivers/block/loop.c b/drivers/block/loop.c index d643c67be6acea..d2ce1ddc192d78 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -1241,7 +1241,6 @@ static int __loop_clr_fd(struct loop_device *lo, bool release) set_capacity(lo->lo_disk, 0); loop_sysfs_exit(lo); if (bdev) { - bd_set_nr_sectors(bdev, 0); /* let user-space know about this change */ kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, KOBJ_CHANGE); } diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c index 45b0423ef2c53d..014683968ce174 100644 --- a/drivers/block/nbd.c +++ b/drivers/block/nbd.c @@ -1132,7 +1132,7 @@ static void nbd_bdev_reset(struct block_device *bdev) { if (bdev->bd_openers > 1) return; - bd_set_nr_sectors(bdev, 0); + set_capacity(bdev->bd_disk, 0); } static void nbd_parse_flags(struct nbd_device *nbd) diff --git a/drivers/block/xen-blkback/common.h b/drivers/block/xen-blkback/common.h index c6ea5d38c509a6..0762db247b41b3 100644 --- a/drivers/block/xen-blkback/common.h +++ b/drivers/block/xen-blkback/common.h @@ -358,9 +358,7 @@ struct pending_req { }; -#define vbd_sz(_v) ((_v)->bdev->bd_part ? \ - (_v)->bdev->bd_part->nr_sects : \ - get_capacity((_v)->bdev->bd_disk)) +#define vbd_sz(_v) bdev_nr_sectors((_v)->bdev) #define xen_blkif_get(_b) (atomic_inc(&(_b)->refcnt)) #define xen_blkif_put(_b) \ diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c index c55d3c58a7ef55..04fa40868fbe10 100644 --- a/drivers/md/bcache/super.c +++ b/drivers/md/bcache/super.c @@ -1408,7 +1408,7 @@ static int cached_dev_init(struct cached_dev *dc, unsigned int block_size) q->limits.raid_partial_stripes_expensive; ret = bcache_device_init(&dc->disk, block_size, - dc->bdev->bd_part->nr_sects - dc->sb.data_offset, + bdev_nr_sectors(dc->bdev) - dc->sb.data_offset, dc->bdev, &bcache_cached_ops); if (ret) return ret; diff --git a/drivers/s390/block/dasd_ioctl.c b/drivers/s390/block/dasd_ioctl.c index 3359559517bfcf..304eba1acf163c 100644 --- a/drivers/s390/block/dasd_ioctl.c +++ b/drivers/s390/block/dasd_ioctl.c @@ -54,8 +54,6 @@ dasd_ioctl_enable(struct block_device *bdev) return -ENODEV; dasd_enable_device(base); - /* Formatting the dasd device can change the capacity. */ - bd_set_nr_sectors(bdev, get_capacity(base->block->gdp)); dasd_put_device(base); return 0; } @@ -88,7 +86,7 @@ dasd_ioctl_disable(struct block_device *bdev) * Set i_size to zero, since read, write, etc. check against this * value. */ - bd_set_nr_sectors(bdev, 0); + set_capacity(bdev->bd_disk, 0); dasd_put_device(base); return 0; } diff --git a/drivers/target/target_core_pscsi.c b/drivers/target/target_core_pscsi.c index 4e37fa9b409d52..a70c33c49f0960 100644 --- a/drivers/target/target_core_pscsi.c +++ b/drivers/target/target_core_pscsi.c @@ -1027,12 +1027,7 @@ static u32 pscsi_get_device_type(struct se_device *dev) static sector_t pscsi_get_blocks(struct se_device *dev) { - struct pscsi_dev_virt *pdv = PSCSI_DEV(dev); - - if (pdv->pdv_bd && pdv->pdv_bd->bd_part) - return pdv->pdv_bd->bd_part->nr_sects; - - return 0; + return bdev_nr_sectors(PSCSI_DEV(dev)->pdv_bd); } static void pscsi_req_done(struct request *req, blk_status_t status) diff --git a/fs/block_dev.c b/fs/block_dev.c index 58e8532d8580a1..b6ebfb7754d3b7 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -1204,70 +1204,6 @@ void bd_unlink_disk_holder(struct block_device *bdev, struct gendisk *disk) EXPORT_SYMBOL_GPL(bd_unlink_disk_holder); #endif -/** - * check_disk_size_change - checks for disk size change and adjusts bdev size. - * @disk: struct gendisk to check - * @bdev: struct bdev to adjust. - * @verbose: if %true log a message about a size change if there is any - * - * This routine checks to see if the bdev size does not match the disk size - * and adjusts it if it differs. When shrinking the bdev size, its all caches - * are freed. - */ -static void check_disk_size_change(struct gendisk *disk, - struct block_device *bdev, bool verbose) -{ - loff_t disk_size, bdev_size; - - spin_lock(&bdev->bd_size_lock); - disk_size = (loff_t)get_capacity(disk) << 9; - bdev_size = i_size_read(bdev->bd_inode); - if (disk_size != bdev_size) { - if (verbose) { - printk(KERN_INFO - "%s: detected capacity change from %lld to %lld\n", - disk->disk_name, bdev_size, disk_size); - } - i_size_write(bdev->bd_inode, disk_size); - } - spin_unlock(&bdev->bd_size_lock); -} - -/** - * revalidate_disk_size - checks for disk size change and adjusts bdev size. - * @disk: struct gendisk to check - * @verbose: if %true log a message about a size change if there is any - * - * This routine checks to see if the bdev size does not match the disk size - * and adjusts it if it differs. When shrinking the bdev size, its all caches - * are freed. - */ -void revalidate_disk_size(struct gendisk *disk, bool verbose) -{ - struct block_device *bdev; - - /* - * Hidden disks don't have associated bdev so there's no point in - * revalidating them. - */ - if (disk->flags & GENHD_FL_HIDDEN) - return; - - bdev = bdget_disk(disk, 0); - if (bdev) { - check_disk_size_change(disk, bdev, verbose); - bdput(bdev); - } -} - -void bd_set_nr_sectors(struct block_device *bdev, sector_t sectors) -{ - spin_lock(&bdev->bd_size_lock); - i_size_write(bdev->bd_inode, (loff_t)sectors << SECTOR_SHIFT); - spin_unlock(&bdev->bd_size_lock); -} -EXPORT_SYMBOL(bd_set_nr_sectors); - static void __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part); int bdev_disk_changed(struct block_device *bdev, bool invalidate) @@ -1301,8 +1237,6 @@ int bdev_disk_changed(struct block_device *bdev, bool invalidate) disk->fops->revalidate_disk(disk); } - check_disk_size_change(disk, bdev, !invalidate); - if (get_capacity(disk)) { ret = blk_add_partitions(disk, bdev); if (ret == -EAGAIN) @@ -1345,10 +1279,8 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode) if (disk->fops->open) ret = disk->fops->open(bdev, mode); - if (!ret) { - bd_set_nr_sectors(bdev, get_capacity(disk)); + if (!ret) set_init_blocksize(bdev); - } /* * If the device is invalidated, rescan partition @@ -1376,13 +1308,12 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode) mutex_unlock(&whole->bd_mutex); bdev->bd_part = disk_get_part(disk, bdev->bd_partno); - if (!bdev->bd_part || !bdev->bd_part->nr_sects) { + if (!bdev_nr_sectors(bdev)) { __blkdev_put(whole, mode, 1); bdput(whole); ret = -ENXIO; goto out_clear; } - bd_set_nr_sectors(bdev, bdev->bd_part->nr_sects); set_init_blocksize(bdev); } diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index 00eff2f5180790..d4e7fab352bacb 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -3151,7 +3151,7 @@ static int f2fs_report_zone_cb(struct blk_zone *zone, unsigned int idx, static int init_blkz_info(struct f2fs_sb_info *sbi, int devi) { struct block_device *bdev = FDEV(devi).bdev; - sector_t nr_sectors = bdev->bd_part->nr_sects; + sector_t nr_sectors = bdev_nr_sectors(bdev); struct f2fs_report_zones_args rep_zone_arg; int ret; diff --git a/fs/pstore/blk.c b/fs/pstore/blk.c index fcd5563dde063c..777a26f7bbe2aa 100644 --- a/fs/pstore/blk.c +++ b/fs/pstore/blk.c @@ -245,7 +245,7 @@ static struct block_device *psblk_get_bdev(void *holder, return bdev; } - nr_sects = part_nr_sects_read(bdev->bd_part); + nr_sects = bdev_nr_sectors(bdev); if (!nr_sects) { pr_err("not enough space for '%s'\n", blkdev); blkdev_put(bdev, mode); diff --git a/include/linux/genhd.h b/include/linux/genhd.h index 6ba91ee54cb2f6..30d4785b7df8bb 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -52,15 +52,6 @@ struct partition_meta_info { struct hd_struct { sector_t start_sect; - /* - * nr_sects is protected by sequence counter. One might extend a - * partition while IO is happening to it and update of nr_sects - * can be non-atomic on 32bit machines with 64bit sector_t. - */ - sector_t nr_sects; -#if BITS_PER_LONG==32 && defined(CONFIG_SMP) - seqcount_t nr_sects_seq; -#endif unsigned long stamp; struct disk_stats __percpu *dkstats; struct percpu_ref ref; @@ -254,13 +245,6 @@ static inline void disk_put_part(struct hd_struct *part) put_device(part_to_dev(part)); } -static inline void hd_sects_seq_init(struct hd_struct *p) -{ -#if BITS_PER_LONG==32 && defined(CONFIG_SMP) - seqcount_init(&p->nr_sects_seq); -#endif -} - /* * Smarter partition iterator without context limits. */ @@ -318,13 +302,15 @@ static inline sector_t get_start_sect(struct block_device *bdev) { return bdev->bd_part->start_sect; } -static inline sector_t get_capacity(struct gendisk *disk) + +static inline sector_t bdev_nr_sectors(struct block_device *bdev) { - return disk->part0.nr_sects; + return i_size_read(bdev->bd_inode) >> 9; } -static inline void set_capacity(struct gendisk *disk, sector_t size) + +static inline sector_t get_capacity(struct gendisk *disk) { - disk->part0.nr_sects = size; + return bdev_nr_sectors(disk->part0.bdev); } int bdev_disk_changed(struct block_device *bdev, bool invalidate); @@ -358,10 +344,9 @@ int __register_blkdev(unsigned int major, const char *name, __register_blkdev(major, name, NULL) void unregister_blkdev(unsigned int major, const char *name); -void revalidate_disk_size(struct gendisk *disk, bool verbose); bool bdev_check_media_change(struct block_device *bdev); int __invalidate_device(struct block_device *bdev, bool kill_dirty); -void bd_set_nr_sectors(struct block_device *bdev, sector_t sectors); +void set_capacity(struct gendisk *disk, sector_t size); /* for drivers/char/raw.c: */ int blkdev_ioctl(struct block_device *, fmode_t, unsigned, unsigned long); diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c index f1022945e3460b..7076d588a50d69 100644 --- a/kernel/trace/blktrace.c +++ b/kernel/trace/blktrace.c @@ -465,7 +465,7 @@ static void blk_trace_setup_lba(struct blk_trace *bt, if (part) { bt->start_lba = part->start_sect; - bt->end_lba = part->start_sect + part->nr_sects; + bt->end_lba = part->start_sect + bdev_nr_sectors(bdev); } else { bt->start_lba = 0; bt->end_lba = -1ULL; From patchwork Thu Nov 26 13:04:08 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11933535 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 358C7C83022 for ; Thu, 26 Nov 2020 13:07:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DE16A221F7 for ; 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b=QKuzKEUj27m1RZDoMeWhcOaD/T wvuINUH6QRpbQmKHOTNoqvZq7NPcfxehq7rQnqMXzbaz5hLZCYfFo1U07SAWs9JqDrSWMDFd1zqJ7 f8Pxn4RprGZH6U/UpdCVXCy2bha45KnQbpnleKkB0LzwfiZ4f3XJELjTexvxBtfjSA68M25CR34Ud tZRZbnqhVmkAfOG8US0eFc5qw8t78/EOyyxnt8UBDCDkcbtfIRGReAl26zI4EOaIGnx7BIRFvMBFh cuc3ObzhpLBx52UKkyyi7UY1p4NbM2CRORLylaamyXzYJ8iYVHjkXoC/CliBQsEx5b15xw3hCtMNG aK2J5T0g==; Received: from [2001:4bb8:18c:1dd6:27b8:b8a1:c13e:ceb1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGzT-00045T-P1; Thu, 26 Nov 2020 13:07:16 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , dm-devel@redhat.com, Jan Kara , linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 30/44] block: move disk stat accounting to struct block_device Date: Thu, 26 Nov 2020 14:04:08 +0100 Message-Id: <20201126130422.92945-31-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201126130422.92945-1-hch@lst.de> References: <20201126130422.92945-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Move the dkstats and stamp field to struct block_device in preparation of killing struct hd_struct. Signed-off-by: Christoph Hellwig Reviewed-by: Jan Kara --- block/blk-cgroup.c | 2 +- block/blk-core.c | 4 ++-- block/blk.h | 1 - block/genhd.c | 14 ++++---------- block/partitions/core.c | 9 +-------- fs/block_dev.c | 10 ++++++++++ include/linux/blk_types.h | 2 ++ include/linux/genhd.h | 2 -- include/linux/part_stat.h | 38 +++++++++++++++++++------------------- 9 files changed, 39 insertions(+), 43 deletions(-) diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c index 19650eb42b9f00..5c0a9d588e6312 100644 --- a/block/blk-cgroup.c +++ b/block/blk-cgroup.c @@ -830,7 +830,7 @@ static void blkcg_fill_root_iostats(void) for_each_possible_cpu(cpu) { struct disk_stats *cpu_dkstats; - cpu_dkstats = per_cpu_ptr(part->dkstats, cpu); + cpu_dkstats = per_cpu_ptr(part->bdev->bd_stats, cpu); tmp.ios[BLKG_IOSTAT_READ] += cpu_dkstats->ios[STAT_READ]; tmp.ios[BLKG_IOSTAT_WRITE] += diff --git a/block/blk-core.c b/block/blk-core.c index 988f45094a387b..d2c9cb24e087f3 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -1264,9 +1264,9 @@ static void update_io_ticks(struct hd_struct *part, unsigned long now, bool end) { unsigned long stamp; again: - stamp = READ_ONCE(part->stamp); + stamp = READ_ONCE(part->bdev->bd_stamp); if (unlikely(stamp != now)) { - if (likely(cmpxchg(&part->stamp, stamp, now) == stamp)) + if (likely(cmpxchg(&part->bdev->bd_stamp, stamp, now) == stamp)) __part_stat_add(part, io_ticks, end ? now - stamp : 1); } if (part->partno) { diff --git a/block/blk.h b/block/blk.h index 09cee7024fb43e..3f801f6e86f8a1 100644 --- a/block/blk.h +++ b/block/blk.h @@ -381,7 +381,6 @@ static inline void hd_struct_put(struct hd_struct *part) static inline void hd_free_part(struct hd_struct *part) { - free_percpu(part->dkstats); kfree(part->info); bdput(part->bdev); percpu_ref_exit(&part->ref); diff --git a/block/genhd.c b/block/genhd.c index c6016fde4725b0..9eead2970cb3d4 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -104,7 +104,7 @@ static void part_stat_read_all(struct hd_struct *part, struct disk_stats *stat) memset(stat, 0, sizeof(struct disk_stats)); for_each_possible_cpu(cpu) { - struct disk_stats *ptr = per_cpu_ptr(part->dkstats, cpu); + struct disk_stats *ptr = per_cpu_ptr(part->bdev->bd_stats, cpu); int group; for (group = 0; group < NR_STAT_GROUPS; group++) { @@ -883,7 +883,7 @@ void del_gendisk(struct gendisk *disk) kobject_put(disk->slave_dir); part_stat_set_all(&disk->part0, 0); - disk->part0.stamp = 0; + disk->part0.bdev->bd_stamp = 0; if (!sysfs_deprecated) sysfs_remove_link(block_depr, dev_name(disk_to_dev(disk))); pm_runtime_set_memalloc_noio(disk_to_dev(disk), false); @@ -1620,19 +1620,15 @@ struct gendisk *__alloc_disk_node(int minors, int node_id) if (!disk->part0.bdev) goto out_free_disk; - disk->part0.dkstats = alloc_percpu(struct disk_stats); - if (!disk->part0.dkstats) - goto out_bdput; - disk->node_id = node_id; if (disk_expand_part_tbl(disk, 0)) - goto out_free_bdstats; + goto out_bdput; ptbl = rcu_dereference_protected(disk->part_tbl, 1); rcu_assign_pointer(ptbl->part[0], &disk->part0); if (hd_ref_init(&disk->part0)) - goto out_free_bdstats; + goto out_bdput; disk->minors = minors; rand_initialize_disk(disk); @@ -1641,8 +1637,6 @@ struct gendisk *__alloc_disk_node(int minors, int node_id) device_initialize(disk_to_dev(disk)); return disk; -out_free_bdstats: - free_percpu(disk->part0.dkstats); out_bdput: bdput(disk->part0.bdev); out_free_disk: diff --git a/block/partitions/core.c b/block/partitions/core.c index bcfa8215bd5ef3..8924e1ea8b2ad6 100644 --- a/block/partitions/core.c +++ b/block/partitions/core.c @@ -409,14 +409,9 @@ static struct hd_struct *add_partition(struct gendisk *disk, int partno, if (!p) return ERR_PTR(-EBUSY); - err = -ENOMEM; - p->dkstats = alloc_percpu(struct disk_stats); - if (!p->dkstats) - goto out_free; - bdev = bdev_alloc(disk, partno); if (!bdev) - goto out_free_stats; + goto out_free; p->bdev = bdev; pdev = part_to_dev(p); @@ -490,8 +485,6 @@ static struct hd_struct *add_partition(struct gendisk *disk, int partno, kfree(p->info); out_bdput: bdput(bdev); -out_free_stats: - free_percpu(p->dkstats); out_free: kfree(p); return ERR_PTR(err); diff --git a/fs/block_dev.c b/fs/block_dev.c index b6ebfb7754d3b7..11e6a9a255845d 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -32,6 +32,7 @@ #include #include #include +#include #include #include #include "internal.h" @@ -781,6 +782,10 @@ static struct inode *bdev_alloc_inode(struct super_block *sb) static void bdev_free_inode(struct inode *inode) { + struct block_device *bdev = I_BDEV(inode); + + free_percpu(bdev->bd_stats); + kmem_cache_free(bdev_cachep, BDEV_I(inode)); } @@ -875,6 +880,11 @@ struct block_device *bdev_alloc(struct gendisk *disk, u8 partno) #ifdef CONFIG_SYSFS INIT_LIST_HEAD(&bdev->bd_holder_disks); #endif + bdev->bd_stats = alloc_percpu(struct disk_stats); + if (!bdev->bd_stats) { + iput(inode); + return NULL; + } return bdev; } diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h index 2e0a9bd9688d28..520011b95276fb 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -20,6 +20,8 @@ typedef void (bio_end_io_t) (struct bio *); struct bio_crypt_ctx; struct block_device { + struct disk_stats __percpu *bd_stats; + unsigned long bd_stamp; dev_t bd_dev; int bd_openers; struct inode * bd_inode; /* will die */ diff --git a/include/linux/genhd.h b/include/linux/genhd.h index 30d4785b7df8bb..804ac45fbfbc53 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -52,8 +52,6 @@ struct partition_meta_info { struct hd_struct { sector_t start_sect; - unsigned long stamp; - struct disk_stats __percpu *dkstats; struct percpu_ref ref; struct block_device *bdev; diff --git a/include/linux/part_stat.h b/include/linux/part_stat.h index 24125778ef3ec7..87ad60106e1db0 100644 --- a/include/linux/part_stat.h +++ b/include/linux/part_stat.h @@ -25,17 +25,17 @@ struct disk_stats { #define part_stat_unlock() preempt_enable() #define part_stat_get_cpu(part, field, cpu) \ - (per_cpu_ptr((part)->dkstats, (cpu))->field) + (per_cpu_ptr((part)->bdev->bd_stats, (cpu))->field) #define part_stat_get(part, field) \ part_stat_get_cpu(part, field, smp_processor_id()) #define part_stat_read(part, field) \ ({ \ - typeof((part)->dkstats->field) res = 0; \ + typeof((part)->bdev->bd_stats->field) res = 0; \ unsigned int _cpu; \ for_each_possible_cpu(_cpu) \ - res += per_cpu_ptr((part)->dkstats, _cpu)->field; \ + res += per_cpu_ptr((part)->bdev->bd_stats, _cpu)->field; \ res; \ }) @@ -44,7 +44,7 @@ static inline void part_stat_set_all(struct hd_struct *part, int value) int i; for_each_possible_cpu(i) - memset(per_cpu_ptr(part->dkstats, i), value, + memset(per_cpu_ptr(part->bdev->bd_stats, i), value, sizeof(struct disk_stats)); } @@ -54,7 +54,7 @@ static inline void part_stat_set_all(struct hd_struct *part, int value) part_stat_read(part, field[STAT_DISCARD])) #define __part_stat_add(part, field, addnd) \ - __this_cpu_add((part)->dkstats->field, addnd) + __this_cpu_add((part)->bdev->bd_stats->field, addnd) #define part_stat_add(part, field, addnd) do { \ __part_stat_add((part), field, addnd); \ @@ -63,20 +63,20 @@ static inline void part_stat_set_all(struct hd_struct *part, int value) field, addnd); \ } while (0) -#define part_stat_dec(gendiskp, field) \ - part_stat_add(gendiskp, field, -1) -#define part_stat_inc(gendiskp, field) \ - part_stat_add(gendiskp, field, 1) -#define part_stat_sub(gendiskp, field, subnd) \ - part_stat_add(gendiskp, field, -subnd) +#define part_stat_dec(part, field) \ + part_stat_add(part, field, -1) +#define part_stat_inc(part, field) \ + part_stat_add(part, field, 1) +#define part_stat_sub(part, field, subnd) \ + part_stat_add(part, field, -subnd) -#define part_stat_local_dec(gendiskp, field) \ - local_dec(&(part_stat_get(gendiskp, field))) -#define part_stat_local_inc(gendiskp, field) \ - local_inc(&(part_stat_get(gendiskp, field))) -#define part_stat_local_read(gendiskp, field) \ - local_read(&(part_stat_get(gendiskp, field))) -#define part_stat_local_read_cpu(gendiskp, field, cpu) \ - local_read(&(part_stat_get_cpu(gendiskp, field, cpu))) +#define part_stat_local_dec(part, field) \ + local_dec(&(part_stat_get(part, field))) +#define part_stat_local_inc(part, field) \ + local_inc(&(part_stat_get(part, field))) +#define part_stat_local_read(part, field) \ + local_read(&(part_stat_get(part, field))) +#define part_stat_local_read_cpu(part, field, cpu) \ + local_read(&(part_stat_get_cpu(part, field, cpu))) #endif /* _LINUX_PART_STAT_H */ From patchwork Thu Nov 26 13:04:09 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11933539 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0B94FC83021 for ; Thu, 26 Nov 2020 13:07:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9D98B221F8 for ; Thu, 26 Nov 2020 13:07:37 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="k1CBVeSA" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389946AbgKZNHg (ORCPT ); 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Received: from [2001:4bb8:18c:1dd6:27b8:b8a1:c13e:ceb1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGzV-00045x-Gz; Thu, 26 Nov 2020 13:07:18 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , dm-devel@redhat.com, Jan Kara , linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 31/44] block: move the start_sect field to struct block_device Date: Thu, 26 Nov 2020 14:04:09 +0100 Message-Id: <20201126130422.92945-32-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201126130422.92945-1-hch@lst.de> References: <20201126130422.92945-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Move the start_sect field to struct block_device in preparation of killing struct hd_struct. Signed-off-by: Christoph Hellwig Reviewed-by: Jan Kara --- block/blk-core.c | 5 +++-- block/blk-lib.c | 2 +- block/genhd.c | 4 ++-- block/partitions/core.c | 17 +++++++++-------- include/linux/blk_types.h | 1 + include/linux/blkdev.h | 4 ++-- include/linux/genhd.h | 3 +-- kernel/trace/blktrace.c | 11 +++-------- 8 files changed, 22 insertions(+), 25 deletions(-) diff --git a/block/blk-core.c b/block/blk-core.c index d2c9cb24e087f3..9a3793d5ce38d4 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -757,9 +757,10 @@ static inline int blk_partition_remap(struct bio *bio) if (bio_sectors(bio)) { if (bio_check_eod(bio, bdev_nr_sectors(p->bdev))) goto out; - bio->bi_iter.bi_sector += p->start_sect; + bio->bi_iter.bi_sector += p->bdev->bd_start_sect; trace_block_bio_remap(bio->bi_disk->queue, bio, part_devt(p), - bio->bi_iter.bi_sector - p->start_sect); + bio->bi_iter.bi_sector - + p->bdev->bd_start_sect); } bio->bi_partno = 0; ret = 0; diff --git a/block/blk-lib.c b/block/blk-lib.c index e90614fd8d6a42..752f9c7220622a 100644 --- a/block/blk-lib.c +++ b/block/blk-lib.c @@ -65,7 +65,7 @@ int __blkdev_issue_discard(struct block_device *bdev, sector_t sector, /* In case the discard request is in a partition */ if (bdev_is_partition(bdev)) - part_offset = bdev->bd_part->start_sect; + part_offset = bdev->bd_start_sect; while (nr_sects) { sector_t granularity_aligned_lba, req_sects; diff --git a/block/genhd.c b/block/genhd.c index 9eead2970cb3d4..7bb45382658385 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -297,8 +297,8 @@ EXPORT_SYMBOL_GPL(disk_part_iter_exit); static inline int sector_in_part(struct hd_struct *part, sector_t sector) { - return part->start_sect <= sector && - sector < part->start_sect + bdev_nr_sectors(part->bdev); + return part->bdev->bd_start_sect <= sector && + sector < part->bdev->bd_start_sect + bdev_nr_sectors(part->bdev); } /** diff --git a/block/partitions/core.c b/block/partitions/core.c index 8924e1ea8b2ad6..485777cea26bfa 100644 --- a/block/partitions/core.c +++ b/block/partitions/core.c @@ -192,7 +192,7 @@ static ssize_t part_start_show(struct device *dev, { struct hd_struct *p = dev_to_part(dev); - return sprintf(buf, "%llu\n",(unsigned long long)p->start_sect); + return sprintf(buf, "%llu\n",(unsigned long long)p->bdev->bd_start_sect); } static ssize_t part_ro_show(struct device *dev, @@ -209,7 +209,7 @@ static ssize_t part_alignment_offset_show(struct device *dev, return sprintf(buf, "%u\n", queue_limit_alignment_offset(&part_to_disk(p)->queue->limits, - p->start_sect)); + p->bdev->bd_start_sect)); } static ssize_t part_discard_alignment_show(struct device *dev, @@ -219,7 +219,7 @@ static ssize_t part_discard_alignment_show(struct device *dev, return sprintf(buf, "%u\n", queue_limit_discard_alignment(&part_to_disk(p)->queue->limits, - p->start_sect)); + p->bdev->bd_start_sect)); } static DEVICE_ATTR(partition, 0444, part_partition_show, NULL); @@ -301,7 +301,7 @@ static void hd_struct_free_work(struct work_struct *work) */ put_device(disk_to_dev(disk)); - part->start_sect = 0; + part->bdev->bd_start_sect = 0; bdev_set_nr_sectors(part->bdev, 0); part_stat_set_all(part, 0); put_device(part_to_dev(part)); @@ -416,7 +416,7 @@ static struct hd_struct *add_partition(struct gendisk *disk, int partno, pdev = part_to_dev(p); - p->start_sect = start; + bdev->bd_start_sect = start; bdev_set_nr_sectors(bdev, len); p->partno = partno; p->policy = get_disk_ro(disk); @@ -508,8 +508,9 @@ static bool partition_overlaps(struct gendisk *disk, sector_t start, disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY); while ((part = disk_part_iter_next(&piter))) { if (part->partno == skip_partno || - start >= part->start_sect + bdev_nr_sectors(part->bdev) || - start + length <= part->start_sect) + start >= part->bdev->bd_start_sect + + bdev_nr_sectors(part->bdev) || + start + length <= part->bdev->bd_start_sect) continue; overlap = true; break; @@ -592,7 +593,7 @@ int bdev_resize_partition(struct block_device *bdev, int partno, mutex_lock_nested(&bdev->bd_mutex, 1); ret = -EINVAL; - if (start != part->start_sect) + if (start != part->bdev->bd_start_sect) goto out_unlock; ret = -EBUSY; diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h index 520011b95276fb..a690008f60cd92 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -20,6 +20,7 @@ typedef void (bio_end_io_t) (struct bio *); struct bio_crypt_ctx; struct block_device { + sector_t bd_start_sect; struct disk_stats __percpu *bd_stats; unsigned long bd_stamp; dev_t bd_dev; diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 43a25d855e049a..619adea5709853 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1488,7 +1488,7 @@ static inline int bdev_alignment_offset(struct block_device *bdev) return -1; if (bdev_is_partition(bdev)) return queue_limit_alignment_offset(&q->limits, - bdev->bd_part->start_sect); + bdev->bd_start_sect); return q->limits.alignment_offset; } @@ -1529,7 +1529,7 @@ static inline int bdev_discard_alignment(struct block_device *bdev) if (bdev_is_partition(bdev)) return queue_limit_discard_alignment(&q->limits, - bdev->bd_part->start_sect); + bdev->bd_start_sect); return q->limits.discard_alignment; } diff --git a/include/linux/genhd.h b/include/linux/genhd.h index 804ac45fbfbc53..50d27f5d38e2af 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -51,7 +51,6 @@ struct partition_meta_info { }; struct hd_struct { - sector_t start_sect; struct percpu_ref ref; struct block_device *bdev; @@ -298,7 +297,7 @@ extern void rand_initialize_disk(struct gendisk *disk); static inline sector_t get_start_sect(struct block_device *bdev) { - return bdev->bd_part->start_sect; + return bdev->bd_start_sect; } static inline sector_t bdev_nr_sectors(struct block_device *bdev) diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c index 7076d588a50d69..8a723a91ec5a06 100644 --- a/kernel/trace/blktrace.c +++ b/kernel/trace/blktrace.c @@ -458,14 +458,9 @@ static struct rchan_callbacks blk_relay_callbacks = { static void blk_trace_setup_lba(struct blk_trace *bt, struct block_device *bdev) { - struct hd_struct *part = NULL; - - if (bdev) - part = bdev->bd_part; - - if (part) { - bt->start_lba = part->start_sect; - bt->end_lba = part->start_sect + bdev_nr_sectors(bdev); + if (bdev) { + bt->start_lba = bdev->bd_start_sect; + bt->end_lba = bdev->bd_start_sect + bdev_nr_sectors(bdev); } else { bt->start_lba = 0; bt->end_lba = -1ULL; From patchwork Thu Nov 26 13:04:10 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11933575 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 087DDC83036 for ; Thu, 26 Nov 2020 13:07:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B576221D7E for ; Thu, 26 Nov 2020 13:07:34 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="pVGb1ocN" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389982AbgKZNHb (ORCPT ); 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Received: from [2001:4bb8:18c:1dd6:27b8:b8a1:c13e:ceb1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGzX-00046R-3X; Thu, 26 Nov 2020 13:07:19 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , dm-devel@redhat.com, Jan Kara , linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 32/44] block: move the partition_meta_info to struct block_device Date: Thu, 26 Nov 2020 14:04:10 +0100 Message-Id: <20201126130422.92945-33-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201126130422.92945-1-hch@lst.de> References: <20201126130422.92945-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Move the partition_meta_info to struct block_device in preparation for killing struct hd_struct. Signed-off-by: Christoph Hellwig Reviewed-by: Jan Kara --- block/blk.h | 1 - block/genhd.c | 3 ++- block/partitions/core.c | 18 +++++++----------- fs/block_dev.c | 1 + include/linux/blk_types.h | 2 ++ include/linux/genhd.h | 1 - init/do_mounts.c | 7 ++++--- 7 files changed, 16 insertions(+), 17 deletions(-) diff --git a/block/blk.h b/block/blk.h index 3f801f6e86f8a1..0bd4b58bcbaf77 100644 --- a/block/blk.h +++ b/block/blk.h @@ -381,7 +381,6 @@ static inline void hd_struct_put(struct hd_struct *part) static inline void hd_free_part(struct hd_struct *part) { - kfree(part->info); bdput(part->bdev); percpu_ref_exit(&part->ref); } diff --git a/block/genhd.c b/block/genhd.c index 7bb45382658385..fe202a12eec096 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -1002,7 +1002,8 @@ void __init printk_all_partitions(void) bdevt_str(part_devt(part), devt_buf), bdev_nr_sectors(part->bdev) >> 1, disk_name(disk, part->partno, name_buf), - part->info ? part->info->uuid : ""); + part->bdev->bd_meta_info ? + part->bdev->bd_meta_info->uuid : ""); if (is_part0) { if (dev->parent && dev->parent->driver) printk(" driver: %s\n", diff --git a/block/partitions/core.c b/block/partitions/core.c index 485777cea26bfa..224a22d82fb86f 100644 --- a/block/partitions/core.c +++ b/block/partitions/core.c @@ -275,8 +275,9 @@ static int part_uevent(struct device *dev, struct kobj_uevent_env *env) struct hd_struct *part = dev_to_part(dev); add_uevent_var(env, "PARTN=%u", part->partno); - if (part->info && part->info->volname[0]) - add_uevent_var(env, "PARTNAME=%s", part->info->volname); + if (part->bdev->bd_meta_info && part->bdev->bd_meta_info->volname[0]) + add_uevent_var(env, "PARTNAME=%s", + part->bdev->bd_meta_info->volname); return 0; } @@ -422,13 +423,10 @@ static struct hd_struct *add_partition(struct gendisk *disk, int partno, p->policy = get_disk_ro(disk); if (info) { - struct partition_meta_info *pinfo; - - pinfo = kzalloc_node(sizeof(*pinfo), GFP_KERNEL, disk->node_id); - if (!pinfo) + err = -ENOMEM; + bdev->bd_meta_info = kmemdup(info, sizeof(*info), GFP_KERNEL); + if (!bdev->bd_meta_info) goto out_bdput; - memcpy(pinfo, info, sizeof(*info)); - p->info = pinfo; } dname = dev_name(ddev); @@ -444,7 +442,7 @@ static struct hd_struct *add_partition(struct gendisk *disk, int partno, err = blk_alloc_devt(p, &devt); if (err) - goto out_free_info; + goto out_bdput; pdev->devt = devt; /* delay uevent until 'holders' subdir is created */ @@ -481,8 +479,6 @@ static struct hd_struct *add_partition(struct gendisk *disk, int partno, kobject_uevent(&pdev->kobj, KOBJ_ADD); return p; -out_free_info: - kfree(p->info); out_bdput: bdput(bdev); out_free: diff --git a/fs/block_dev.c b/fs/block_dev.c index 11e6a9a255845d..62fae6a0e8aa56 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -785,6 +785,7 @@ static void bdev_free_inode(struct inode *inode) struct block_device *bdev = I_BDEV(inode); free_percpu(bdev->bd_stats); + kfree(bdev->bd_meta_info); kmem_cache_free(bdev_cachep, BDEV_I(inode)); } diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h index a690008f60cd92..2f8ede04e5a94c 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -49,6 +49,8 @@ struct block_device { /* Mutex for freeze */ struct mutex bd_fsfreeze_mutex; struct super_block *bd_fsfreeze_sb; + + struct partition_meta_info *bd_meta_info; } __randomize_layout; #define bdev_whole(_bdev) \ diff --git a/include/linux/genhd.h b/include/linux/genhd.h index 50d27f5d38e2af..30d7076155b4d2 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -57,7 +57,6 @@ struct hd_struct { struct device __dev; struct kobject *holder_dir; int policy, partno; - struct partition_meta_info *info; #ifdef CONFIG_FAIL_MAKE_REQUEST int make_it_fail; #endif diff --git a/init/do_mounts.c b/init/do_mounts.c index 5879edf083b318..368ccb71850126 100644 --- a/init/do_mounts.c +++ b/init/do_mounts.c @@ -79,8 +79,8 @@ static int match_dev_by_uuid(struct device *dev, const void *data) const struct uuidcmp *cmp = data; struct hd_struct *part = dev_to_part(dev); - if (!part->info || - strncasecmp(cmp->uuid, part->info->uuid, cmp->len)) + if (!part->bdev->bd_meta_info || + strncasecmp(cmp->uuid, part->bdev->bd_meta_info->uuid, cmp->len)) return 0; return 1; } @@ -169,7 +169,8 @@ static int match_dev_by_label(struct device *dev, const void *data) const char *label = data; struct hd_struct *part = dev_to_part(dev); - if (!part->info || strcmp(label, part->info->volname)) + if (!part->bdev->bd_meta_info || + strcmp(label, part->bdev->bd_meta_info->volname)) return 0; return 1; } From patchwork Thu Nov 26 13:04:11 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11933545 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 65363C64E90 for ; Thu, 26 Nov 2020 13:07:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1B11D21D7E for ; 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b=Y4k4lRn+LNJexgb4M5plOdxokT ZLK/VVMCyi5BmEK2ymf+rsQ8sxvkmW5CJOyq/xjq9zoKYaqT8LffoLUNtz4L7JsPHRKFK3XCnpgT4 xxvzJ73Ma0wd39bFQhtKZEgKn0SdGBu+jscDv4JdAEseSezqU2POPHkXXue6xWF6Zvaa03ZvG72L6 Qa9/3UagXmOIksvzMy22sVcvDA+hDrY2C8wNtaRWwhAwcSP7iyCrGbdhi4iMooTSd+iXgerVeT6AL aWVGjICKpnugxaR0hKEBWSZqviQMLD/Yrsmy7AS4qIVTtIDXmyj7UIqVYq8xUhXtU7wsazLCL5RWa n/b0zPAw==; Received: from [2001:4bb8:18c:1dd6:27b8:b8a1:c13e:ceb1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGzY-00046z-IP; Thu, 26 Nov 2020 13:07:21 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , dm-devel@redhat.com, Jan Kara , linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 33/44] block: move holder_dir to struct block_device Date: Thu, 26 Nov 2020 14:04:11 +0100 Message-Id: <20201126130422.92945-34-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201126130422.92945-1-hch@lst.de> References: <20201126130422.92945-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Move the holder_dir field to struct block_device in preparation for kill struct hd_struct. Signed-off-by: Christoph Hellwig Reviewed-by: Jan Kara --- block/genhd.c | 5 +++-- block/partitions/core.c | 8 ++++---- fs/block_dev.c | 11 +++++------ include/linux/blk_types.h | 1 + include/linux/genhd.h | 1 - 5 files changed, 13 insertions(+), 13 deletions(-) diff --git a/block/genhd.c b/block/genhd.c index fe202a12eec096..a964e7532fedd5 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -673,7 +673,8 @@ static void register_disk(struct device *parent, struct gendisk *disk, */ pm_runtime_set_memalloc_noio(ddev, true); - disk->part0.holder_dir = kobject_create_and_add("holders", &ddev->kobj); + disk->part0.bdev->bd_holder_dir = + kobject_create_and_add("holders", &ddev->kobj); disk->slave_dir = kobject_create_and_add("slaves", &ddev->kobj); if (disk->flags & GENHD_FL_HIDDEN) { @@ -879,7 +880,7 @@ void del_gendisk(struct gendisk *disk) blk_unregister_queue(disk); - kobject_put(disk->part0.holder_dir); + kobject_put(disk->part0.bdev->bd_holder_dir); kobject_put(disk->slave_dir); part_stat_set_all(&disk->part0, 0); diff --git a/block/partitions/core.c b/block/partitions/core.c index 224a22d82fb86f..d1093adf2570e2 100644 --- a/block/partitions/core.c +++ b/block/partitions/core.c @@ -344,7 +344,7 @@ void delete_partition(struct hd_struct *part) */ get_device(disk_to_dev(disk)); rcu_assign_pointer(ptbl->part[part->partno], NULL); - kobject_put(part->holder_dir); + kobject_put(part->bdev->bd_holder_dir); device_del(part_to_dev(part)); /* @@ -452,8 +452,8 @@ static struct hd_struct *add_partition(struct gendisk *disk, int partno, goto out_put; err = -ENOMEM; - p->holder_dir = kobject_create_and_add("holders", &pdev->kobj); - if (!p->holder_dir) + bdev->bd_holder_dir = kobject_create_and_add("holders", &pdev->kobj); + if (!bdev->bd_holder_dir) goto out_del; dev_set_uevent_suppress(pdev, 0); @@ -487,7 +487,7 @@ static struct hd_struct *add_partition(struct gendisk *disk, int partno, out_remove_file: device_remove_file(pdev, &dev_attr_whole_disk); out_del: - kobject_put(p->holder_dir); + kobject_put(bdev->bd_holder_dir); device_del(pdev); out_put: put_device(pdev); diff --git a/fs/block_dev.c b/fs/block_dev.c index 62fae6a0e8aa56..2c91c35149787a 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -1138,7 +1138,7 @@ int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk) WARN_ON_ONCE(!bdev->bd_holder); /* FIXME: remove the following once add_disk() handles errors */ - if (WARN_ON(!disk->slave_dir || !bdev->bd_part->holder_dir)) + if (WARN_ON(!disk->slave_dir || !bdev->bd_holder_dir)) goto out_unlock; holder = bd_find_holder_disk(bdev, disk); @@ -1161,14 +1161,14 @@ int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk) if (ret) goto out_free; - ret = add_symlink(bdev->bd_part->holder_dir, &disk_to_dev(disk)->kobj); + ret = add_symlink(bdev->bd_holder_dir, &disk_to_dev(disk)->kobj); if (ret) goto out_del; /* * bdev could be deleted beneath us which would implicitly destroy * the holder directory. Hold on to it. */ - kobject_get(bdev->bd_part->holder_dir); + kobject_get(bdev->bd_holder_dir); list_add(&holder->list, &bdev->bd_holder_disks); goto out_unlock; @@ -1203,9 +1203,8 @@ void bd_unlink_disk_holder(struct block_device *bdev, struct gendisk *disk) if (!WARN_ON_ONCE(holder == NULL) && !--holder->refcnt) { del_symlink(disk->slave_dir, bdev_kobj(bdev)); - del_symlink(bdev->bd_part->holder_dir, - &disk_to_dev(disk)->kobj); - kobject_put(bdev->bd_part->holder_dir); + del_symlink(bdev->bd_holder_dir, &disk_to_dev(disk)->kobj); + kobject_put(bdev->bd_holder_dir); list_del_init(&holder->list); kfree(holder); } diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h index 2f8ede04e5a94c..c0591e52d7d7ce 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -35,6 +35,7 @@ struct block_device { #ifdef CONFIG_SYSFS struct list_head bd_holder_disks; #endif + struct kobject *bd_holder_dir; u8 bd_partno; struct hd_struct * bd_part; /* number of times partitions within this device have been opened. */ diff --git a/include/linux/genhd.h b/include/linux/genhd.h index 30d7076155b4d2..b4a5c05593b99c 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -55,7 +55,6 @@ struct hd_struct { struct block_device *bdev; struct device __dev; - struct kobject *holder_dir; int policy, partno; #ifdef CONFIG_FAIL_MAKE_REQUEST int make_it_fail; From patchwork Thu Nov 26 13:04:12 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11933559 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 01DEEC8300F for ; Thu, 26 Nov 2020 13:07:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9FAF621D7E for ; Thu, 26 Nov 2020 13:07:43 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="kmAZCxAi" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390033AbgKZNHm (ORCPT ); Thu, 26 Nov 2020 08:07:42 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53186 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390010AbgKZNHe (ORCPT ); Thu, 26 Nov 2020 08:07:34 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AE5D2C0617A7; Thu, 26 Nov 2020 05:07:34 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=1tcmRx2mjZ+Q0k6ARd6yRdSqtADfA0cYzHXyc7NNrVk=; b=kmAZCxAi6xcgTPP0Avv8cTDFbZ 5PEFZnq11bNC0btirTZjpOAOBLClmL5HONBvtQAXOe0qcNAZDea75fJ5/1Lq/MxoYHED8oo5NOBJb 3RZqC1kKyfgBlYiXqTQ13q2P2vlcz2E2GxokcO+X6K4okweXBRcqAGR4RxU1CFbRMRoepxVf5DoLa c34AZvB3wO/hXCwJbuJbHWkaLg2hbwrBHUvaNmwufYCRfkKyK/ZJ135+AwRzhKgg925DewueMIgtx K1UDnBNEDdgUJTol8+OMiQUSyRuFnphgnXq9JZ6HT5pIgOcxTSz1TS8dwvIJhFGF/U++k5f9W/XYh 2UiV8+ug==; Received: from [2001:4bb8:18c:1dd6:27b8:b8a1:c13e:ceb1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGza-00047X-3B; Thu, 26 Nov 2020 13:07:22 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , dm-devel@redhat.com, Jan Kara , linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 34/44] block: move make_it_fail to struct block_device Date: Thu, 26 Nov 2020 14:04:12 +0100 Message-Id: <20201126130422.92945-35-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201126130422.92945-1-hch@lst.de> References: <20201126130422.92945-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Move the make_it_fail flag to struct block_device an turn it into a bool in preparation of killing struct hd_struct. Signed-off-by: Christoph Hellwig Reviewed-by: Jan Kara --- block/blk-core.c | 3 ++- block/genhd.c | 4 ++-- include/linux/blk_types.h | 3 +++ include/linux/genhd.h | 3 --- 4 files changed, 7 insertions(+), 6 deletions(-) diff --git a/block/blk-core.c b/block/blk-core.c index 9a3793d5ce38d4..9121390be97a76 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -668,7 +668,8 @@ __setup("fail_make_request=", setup_fail_make_request); static bool should_fail_request(struct hd_struct *part, unsigned int bytes) { - return part->make_it_fail && should_fail(&fail_make_request, bytes); + return part->bdev->bd_make_it_fail && + should_fail(&fail_make_request, bytes); } static int __init fail_make_request_debugfs(void) diff --git a/block/genhd.c b/block/genhd.c index a964e7532fedd5..0371558ccde14c 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -1284,7 +1284,7 @@ ssize_t part_fail_show(struct device *dev, { struct hd_struct *p = dev_to_part(dev); - return sprintf(buf, "%d\n", p->make_it_fail); + return sprintf(buf, "%d\n", p->bdev->bd_make_it_fail); } ssize_t part_fail_store(struct device *dev, @@ -1295,7 +1295,7 @@ ssize_t part_fail_store(struct device *dev, int i; if (count > 0 && sscanf(buf, "%d", &i) > 0) - p->make_it_fail = (i == 0) ? 0 : 1; + p->pdev->bd_make_it_fail = (i == 0) ? 0 : 1; return count; } diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h index c0591e52d7d7ce..b237f1e4081405 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -52,6 +52,9 @@ struct block_device { struct super_block *bd_fsfreeze_sb; struct partition_meta_info *bd_meta_info; +#ifdef CONFIG_FAIL_MAKE_REQUEST + bool bd_make_it_fail; +#endif } __randomize_layout; #define bdev_whole(_bdev) \ diff --git a/include/linux/genhd.h b/include/linux/genhd.h index b4a5c05593b99c..349cf6403ccddc 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -56,9 +56,6 @@ struct hd_struct { struct block_device *bdev; struct device __dev; int policy, partno; -#ifdef CONFIG_FAIL_MAKE_REQUEST - int make_it_fail; -#endif struct rcu_work rcu_work; }; From patchwork Thu Nov 26 13:04:13 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11933549 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3B121C83019 for ; Thu, 26 Nov 2020 13:07:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 08B20221F1 for ; Thu, 26 Nov 2020 13:07:44 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="jJXqBUAS" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390034AbgKZNHm (ORCPT ); Thu, 26 Nov 2020 08:07:42 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53184 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389989AbgKZNHe (ORCPT ); Thu, 26 Nov 2020 08:07:34 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8778AC0613D4; Thu, 26 Nov 2020 05:07:34 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=AmF+soi/tJlwBNaRONn2IjJTl0osBWVgBcgFQOU13ls=; b=jJXqBUAS3st2PZGdwZeZime/43 eTZI5ELlBaI3OiNEy21rSFdQoNQmJi1T6VVB+866taDb4O/afrByfjnlvDvxJpLZjFXOXJ1+KQqXc QBfftUZAJanQY9Jge2SNJo9P6m3fdkCcEUuT+GjW46V9tXYGLkkDD+bW3c9kYt7UfidTTbY7V0VB4 bBi3q/XQgGF/jhkhnEHSgPlNPm8SgssZdAxLOzrXNgNnwaAaSMwUZBYWH7JCgG1QM5Ulk2FTMKl/B 8PV2emIEVL0okwr3E1uUbf2Om64AR3FFqaYfrvLkrDs2boYEXrB2y1JgtukMIZUfZ97OXplXNKv6a QtIAveUQ==; Received: from [2001:4bb8:18c:1dd6:27b8:b8a1:c13e:ceb1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGzb-000484-DD; Thu, 26 Nov 2020 13:07:23 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , dm-devel@redhat.com, Jan Kara , linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 35/44] block: move the policy field to struct block_device Date: Thu, 26 Nov 2020 14:04:13 +0100 Message-Id: <20201126130422.92945-36-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201126130422.92945-1-hch@lst.de> References: <20201126130422.92945-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Move the policy field to struct block_device and rename it to the more descriptive bd_read_only. Also turn the field into a bool as it is used as such. Signed-off-by: Christoph Hellwig Reviewed-by: Jan Kara --- block/blk-core.c | 2 +- block/genhd.c | 8 ++++---- block/ioctl.c | 2 +- block/partitions/core.c | 4 ++-- include/linux/blk_types.h | 1 + include/linux/genhd.h | 4 ++-- 6 files changed, 11 insertions(+), 10 deletions(-) diff --git a/block/blk-core.c b/block/blk-core.c index 9121390be97a76..d64ffcb6f9ae5d 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -696,7 +696,7 @@ static inline bool bio_check_ro(struct bio *bio, struct hd_struct *part) { const int op = bio_op(bio); - if (part->policy && op_is_write(op)) { + if (part->bdev->bd_read_only && op_is_write(op)) { char b[BDEVNAME_SIZE]; if (op_is_flush(bio->bi_opf) && !bio_sectors(bio)) diff --git a/block/genhd.c b/block/genhd.c index 0371558ccde14c..ae312ccc6dd7c0 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -1679,14 +1679,14 @@ void set_disk_ro(struct gendisk *disk, int flag) struct disk_part_iter piter; struct hd_struct *part; - if (disk->part0.policy != flag) { + if (disk->part0.bdev->bd_read_only != flag) { set_disk_ro_uevent(disk, flag); - disk->part0.policy = flag; + disk->part0.bdev->bd_read_only = flag; } disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY); while ((part = disk_part_iter_next(&piter))) - part->policy = flag; + part->bdev->bd_read_only = flag; disk_part_iter_exit(&piter); } @@ -1696,7 +1696,7 @@ int bdev_read_only(struct block_device *bdev) { if (!bdev) return 0; - return bdev->bd_part->policy; + return bdev->bd_read_only; } EXPORT_SYMBOL(bdev_read_only); diff --git a/block/ioctl.c b/block/ioctl.c index a6d8171221c7dc..d61d652078f41c 100644 --- a/block/ioctl.c +++ b/block/ioctl.c @@ -345,7 +345,7 @@ static int blkdev_roset(struct block_device *bdev, fmode_t mode, if (ret) return ret; } - bdev->bd_part->policy = n; + bdev->bd_read_only = n; return 0; } diff --git a/block/partitions/core.c b/block/partitions/core.c index d1093adf2570e2..f397ec9922bd6e 100644 --- a/block/partitions/core.c +++ b/block/partitions/core.c @@ -199,7 +199,7 @@ static ssize_t part_ro_show(struct device *dev, struct device_attribute *attr, char *buf) { struct hd_struct *p = dev_to_part(dev); - return sprintf(buf, "%d\n", p->policy ? 1 : 0); + return sprintf(buf, "%d\n", p->bdev->bd_read_only); } static ssize_t part_alignment_offset_show(struct device *dev, @@ -420,7 +420,7 @@ static struct hd_struct *add_partition(struct gendisk *disk, int partno, bdev->bd_start_sect = start; bdev_set_nr_sectors(bdev, len); p->partno = partno; - p->policy = get_disk_ro(disk); + bdev->bd_read_only = get_disk_ro(disk); if (info) { err = -ENOMEM; diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h index b237f1e4081405..758cf71c9aa2a6 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -23,6 +23,7 @@ struct block_device { sector_t bd_start_sect; struct disk_stats __percpu *bd_stats; unsigned long bd_stamp; + bool bd_read_only; /* read-only policy */ dev_t bd_dev; int bd_openers; struct inode * bd_inode; /* will die */ diff --git a/include/linux/genhd.h b/include/linux/genhd.h index 349cf6403ccddc..dcbf9ef7610ea6 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -55,7 +55,7 @@ struct hd_struct { struct block_device *bdev; struct device __dev; - int policy, partno; + int partno; struct rcu_work rcu_work; }; @@ -278,7 +278,7 @@ extern void set_disk_ro(struct gendisk *disk, int flag); static inline int get_disk_ro(struct gendisk *disk) { - return disk->part0.policy; + return disk->part0.bdev->bd_read_only; } extern void disk_block_events(struct gendisk *disk); From patchwork Thu Nov 26 13:04:14 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11933567 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 90291C64E7A for ; Thu, 26 Nov 2020 13:07:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 32A3B221EB for ; Thu, 26 Nov 2020 13:07:39 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="CczgoP3S" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390012AbgKZNHh (ORCPT ); Thu, 26 Nov 2020 08:07:37 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53194 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389937AbgKZNHg (ORCPT ); Thu, 26 Nov 2020 08:07:36 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F364DC061A04; Thu, 26 Nov 2020 05:07:35 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=Q6NHO/r12SeiY8VwWlXwCsWt/PVYqD0OQJpqZvAi3gs=; b=CczgoP3SGEbThaDZHhqX2KpQ9j REH9buzBGkboIKv1m+PF3h6UXECWQ3WUzxqbIp0eYUHQEscpquh68OPW6F5uqEZf1B2Mc6bRR19vw z1oYa072/9Cg4UcYuDtSQY1ygXd5Mp605htnBjwPqiXaHkvKAf4mGtKtqot7S4UJT/uMd67piZqF2 n9G9Afh+FNf0/Z0+qIM6tLUqp+jfyjQoppiKKzsTopdBOGKDKyWqNVxUB1juvhmzwjiDrSO1kWzwo lvbr6BP235AS+CJHHd2CAFoMSMoDeJJwIImtt6cUEjKZ9PyU+FuC738xHdpNJJPp8KQE0CAFZSrSX M/QFznYA==; Received: from [2001:4bb8:18c:1dd6:27b8:b8a1:c13e:ceb1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGzc-00048U-Qr; Thu, 26 Nov 2020 13:07:25 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , dm-devel@redhat.com, Jan Kara , linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 36/44] block: allocate struct hd_struct as part of struct bdev_inode Date: Thu, 26 Nov 2020 14:04:14 +0100 Message-Id: <20201126130422.92945-37-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201126130422.92945-1-hch@lst.de> References: <20201126130422.92945-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Allocate hd_struct together with struct block_device to pre-load the lifetime rule changes in preparation of merging the two structures. Note that part0 was previously embedded into struct gendisk, but is a separate allocation now, and already points to the block_device instead of the hd_struct. The lifetime of struct gendisk is still controlled by the struct device embedded in the part0 hd_struct. Signed-off-by: Christoph Hellwig Reviewed-by: Jan Kara --- block/blk-core.c | 16 ++++--- block/blk-flush.c | 2 +- block/blk-merge.c | 2 - block/blk.h | 21 ---------- block/genhd.c | 50 +++++++++------------- block/partitions/core.c | 67 +++--------------------------- drivers/block/drbd/drbd_receiver.c | 2 +- drivers/block/drbd/drbd_worker.c | 3 +- drivers/block/zram/zram_drv.c | 2 +- drivers/md/dm.c | 4 +- drivers/md/md.c | 2 +- fs/block_dev.c | 37 +++++------------ include/linux/blk_types.h | 2 +- include/linux/genhd.h | 14 +++---- include/linux/part_stat.h | 4 +- 15 files changed, 60 insertions(+), 168 deletions(-) diff --git a/block/blk-core.c b/block/blk-core.c index d64ffcb6f9ae5d..9ea70275fc1cfe 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -714,7 +714,8 @@ static inline bool bio_check_ro(struct bio *bio, struct hd_struct *part) static noinline int should_fail_bio(struct bio *bio) { - if (should_fail_request(&bio->bi_disk->part0, bio->bi_iter.bi_size)) + if (should_fail_request(bio->bi_disk->part0->bd_part, + bio->bi_iter.bi_size)) return -EIO; return 0; } @@ -831,7 +832,7 @@ static noinline_for_stack bool submit_bio_checks(struct bio *bio) if (unlikely(blk_partition_remap(bio))) goto end_io; } else { - if (unlikely(bio_check_ro(bio, &bio->bi_disk->part0))) + if (unlikely(bio_check_ro(bio, bio->bi_disk->part0->bd_part))) goto end_io; if (unlikely(bio_check_eod(bio, get_capacity(bio->bi_disk)))) goto end_io; @@ -1203,7 +1204,7 @@ blk_status_t blk_insert_cloned_request(struct request_queue *q, struct request * return ret; if (rq->rq_disk && - should_fail_request(&rq->rq_disk->part0, blk_rq_bytes(rq))) + should_fail_request(rq->rq_disk->part0->bd_part, blk_rq_bytes(rq))) return BLK_STS_IOERR; if (blk_crypto_insert_cloned_request(rq)) @@ -1272,7 +1273,7 @@ static void update_io_ticks(struct hd_struct *part, unsigned long now, bool end) __part_stat_add(part, io_ticks, end ? now - stamp : 1); } if (part->partno) { - part = &part_to_disk(part)->part0; + part = part_to_disk(part)->part0->bd_part; goto again; } } @@ -1309,8 +1310,6 @@ void blk_account_io_done(struct request *req, u64 now) part_stat_inc(part, ios[sgrp]); part_stat_add(part, nsecs[sgrp], now - req->start_time_ns); part_stat_unlock(); - - hd_struct_put(part); } } @@ -1354,7 +1353,7 @@ EXPORT_SYMBOL_GPL(part_start_io_acct); unsigned long disk_start_io_acct(struct gendisk *disk, unsigned int sectors, unsigned int op) { - return __part_start_io_acct(&disk->part0, sectors, op); + return __part_start_io_acct(disk->part0->bd_part, sectors, op); } EXPORT_SYMBOL(disk_start_io_acct); @@ -1376,14 +1375,13 @@ void part_end_io_acct(struct hd_struct *part, struct bio *bio, unsigned long start_time) { __part_end_io_acct(part, bio_op(bio), start_time); - hd_struct_put(part); } EXPORT_SYMBOL_GPL(part_end_io_acct); void disk_end_io_acct(struct gendisk *disk, unsigned int op, unsigned long start_time) { - __part_end_io_acct(&disk->part0, op, start_time); + __part_end_io_acct(disk->part0->bd_part, op, start_time); } EXPORT_SYMBOL(disk_end_io_acct); diff --git a/block/blk-flush.c b/block/blk-flush.c index e32958f0b68750..fcd0a60574dff8 100644 --- a/block/blk-flush.c +++ b/block/blk-flush.c @@ -139,7 +139,7 @@ static void blk_flush_queue_rq(struct request *rq, bool add_front) static void blk_account_io_flush(struct request *rq) { - struct hd_struct *part = &rq->rq_disk->part0; + struct hd_struct *part = rq->rq_disk->part0->bd_part; part_stat_lock(); part_stat_inc(part, ios[STAT_FLUSH]); diff --git a/block/blk-merge.c b/block/blk-merge.c index bcf5e458060337..cb351ab9b77dbd 100644 --- a/block/blk-merge.c +++ b/block/blk-merge.c @@ -683,8 +683,6 @@ static void blk_account_io_merge_request(struct request *req) part_stat_lock(); part_stat_inc(req->part, merges[op_stat_group(req_op(req))]); part_stat_unlock(); - - hd_struct_put(req->part); } } diff --git a/block/blk.h b/block/blk.h index 0bd4b58bcbaf77..32ac41f7557fcc 100644 --- a/block/blk.h +++ b/block/blk.h @@ -363,27 +363,6 @@ int bdev_del_partition(struct block_device *bdev, int partno); int bdev_resize_partition(struct block_device *bdev, int partno, sector_t start, sector_t length); int disk_expand_part_tbl(struct gendisk *disk, int target); -int hd_ref_init(struct hd_struct *part); - -/* no need to get/put refcount of part0 */ -static inline int hd_struct_try_get(struct hd_struct *part) -{ - if (part->partno) - return percpu_ref_tryget_live(&part->ref); - return 1; -} - -static inline void hd_struct_put(struct hd_struct *part) -{ - if (part->partno) - percpu_ref_put(&part->ref); -} - -static inline void hd_free_part(struct hd_struct *part) -{ - bdput(part->bdev); - percpu_ref_exit(&part->ref); -} int bio_add_hw_page(struct request_queue *q, struct bio *bio, struct page *page, unsigned int len, unsigned int offset, diff --git a/block/genhd.c b/block/genhd.c index ae312ccc6dd7c0..eaa5d65ae826b8 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -42,7 +42,7 @@ static void disk_release_events(struct gendisk *disk); void set_capacity(struct gendisk *disk, sector_t sectors) { - struct block_device *bdev = disk->part0.bdev; + struct block_device *bdev = disk->part0; spin_lock(&bdev->bd_size_lock); i_size_write(bdev->bd_inode, (loff_t)sectors << SECTOR_SHIFT); @@ -310,9 +310,7 @@ static inline int sector_in_part(struct hd_struct *part, sector_t sector) * primarily used for stats accounting. * * CONTEXT: - * RCU read locked. The returned partition pointer is always valid - * because its refcount is grabbed except for part0, which lifetime - * is same with the disk. + * RCU read locked. * * RETURNS: * Found partition on success, part0 is returned if no partition matches @@ -328,26 +326,19 @@ struct hd_struct *disk_map_sector_rcu(struct gendisk *disk, sector_t sector) ptbl = rcu_dereference(disk->part_tbl); part = rcu_dereference(ptbl->last_lookup); - if (part && sector_in_part(part, sector) && hd_struct_try_get(part)) + if (part && sector_in_part(part, sector)) goto out_unlock; for (i = 1; i < ptbl->len; i++) { part = rcu_dereference(ptbl->part[i]); if (part && sector_in_part(part, sector)) { - /* - * only live partition can be cached for lookup, - * so use-after-free on cached & deleting partition - * can be avoided - */ - if (!hd_struct_try_get(part)) - break; rcu_assign_pointer(ptbl->last_lookup, part); goto out_unlock; } } - part = &disk->part0; + part = disk->part0->bd_part; out_unlock: rcu_read_unlock(); return part; @@ -673,8 +664,8 @@ static void register_disk(struct device *parent, struct gendisk *disk, */ pm_runtime_set_memalloc_noio(ddev, true); - disk->part0.bdev->bd_holder_dir = - kobject_create_and_add("holders", &ddev->kobj); + disk->part0->bd_holder_dir = + kobject_create_and_add("holders", &ddev->kobj); disk->slave_dir = kobject_create_and_add("slaves", &ddev->kobj); if (disk->flags & GENHD_FL_HIDDEN) { @@ -740,7 +731,7 @@ static void __device_add_disk(struct device *parent, struct gendisk *disk, disk->flags |= GENHD_FL_UP; - retval = blk_alloc_devt(&disk->part0, &devt); + retval = blk_alloc_devt(disk->part0->bd_part, &devt); if (retval) { WARN_ON(1); return; @@ -767,7 +758,7 @@ static void __device_add_disk(struct device *parent, struct gendisk *disk, ret = bdi_register(bdi, "%u:%u", MAJOR(devt), MINOR(devt)); WARN_ON(ret); bdi_set_owner(bdi, dev); - bdev_add(disk->part0.bdev, devt); + bdev_add(disk->part0, devt); } register_disk(parent, disk, groups); if (register_queue) @@ -880,11 +871,11 @@ void del_gendisk(struct gendisk *disk) blk_unregister_queue(disk); - kobject_put(disk->part0.bdev->bd_holder_dir); + kobject_put(disk->part0->bd_holder_dir); kobject_put(disk->slave_dir); - part_stat_set_all(&disk->part0, 0); - disk->part0.bdev->bd_stamp = 0; + part_stat_set_all(disk->part0->bd_part, 0); + disk->part0->bd_stamp = 0; if (!sysfs_deprecated) sysfs_remove_link(block_depr, dev_name(disk_to_dev(disk))); pm_runtime_set_memalloc_noio(disk_to_dev(disk), false); @@ -997,7 +988,7 @@ void __init printk_all_partitions(void) */ disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); while ((part = disk_part_iter_next(&piter))) { - bool is_part0 = part == &disk->part0; + bool is_part0 = part == disk->part0->bd_part; printk("%s%s %10llu %s %s", is_part0 ? "" : " ", bdevt_str(part_devt(part), devt_buf), @@ -1452,7 +1443,7 @@ static void disk_release(struct device *dev) disk_release_events(disk); kfree(disk->random); disk_replace_part_tbl(disk, NULL); - hd_free_part(&disk->part0); + bdput(disk->part0); if (disk->queue) blk_put_queue(disk->queue); kfree(disk); @@ -1618,8 +1609,8 @@ struct gendisk *__alloc_disk_node(int minors, int node_id) if (!disk) return NULL; - disk->part0.bdev = bdev_alloc(disk, 0); - if (!disk->part0.bdev) + disk->part0 = bdev_alloc(disk, 0); + if (!disk->part0) goto out_free_disk; disk->node_id = node_id; @@ -1627,10 +1618,7 @@ struct gendisk *__alloc_disk_node(int minors, int node_id) goto out_bdput; ptbl = rcu_dereference_protected(disk->part_tbl, 1); - rcu_assign_pointer(ptbl->part[0], &disk->part0); - - if (hd_ref_init(&disk->part0)) - goto out_bdput; + rcu_assign_pointer(ptbl->part[0], disk->part0->bd_part); disk->minors = minors; rand_initialize_disk(disk); @@ -1640,7 +1628,7 @@ struct gendisk *__alloc_disk_node(int minors, int node_id) return disk; out_bdput: - bdput(disk->part0.bdev); + bdput(disk->part0); out_free_disk: kfree(disk); return NULL; @@ -1679,9 +1667,9 @@ void set_disk_ro(struct gendisk *disk, int flag) struct disk_part_iter piter; struct hd_struct *part; - if (disk->part0.bdev->bd_read_only != flag) { + if (disk->part0->bd_read_only != flag) { set_disk_ro_uevent(disk, flag); - disk->part0.bdev->bd_read_only = flag; + disk->part0->bd_read_only = flag; } disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY); diff --git a/block/partitions/core.c b/block/partitions/core.c index f397ec9922bd6e..9c7e6730fa6098 100644 --- a/block/partitions/core.c +++ b/block/partitions/core.c @@ -265,9 +265,9 @@ static const struct attribute_group *part_attr_groups[] = { static void part_release(struct device *dev) { struct hd_struct *p = dev_to_part(dev); + blk_free_devt(dev->devt); - hd_free_part(p); - kfree(p); + bdput(p->bdev); } static int part_uevent(struct device *dev, struct kobj_uevent_env *env) @@ -288,46 +288,6 @@ struct device_type part_type = { .uevent = part_uevent, }; -static void hd_struct_free_work(struct work_struct *work) -{ - struct hd_struct *part = - container_of(to_rcu_work(work), struct hd_struct, rcu_work); - struct gendisk *disk = part_to_disk(part); - - /* - * Release the disk reference acquired in delete_partition here. - * We can't release it in hd_struct_free because the final put_device - * needs process context and thus can't be run directly from a - * percpu_ref ->release handler. - */ - put_device(disk_to_dev(disk)); - - part->bdev->bd_start_sect = 0; - bdev_set_nr_sectors(part->bdev, 0); - part_stat_set_all(part, 0); - put_device(part_to_dev(part)); -} - -static void hd_struct_free(struct percpu_ref *ref) -{ - struct hd_struct *part = container_of(ref, struct hd_struct, ref); - struct gendisk *disk = part_to_disk(part); - struct disk_part_tbl *ptbl = - rcu_dereference_protected(disk->part_tbl, 1); - - rcu_assign_pointer(ptbl->last_lookup, NULL); - - INIT_RCU_WORK(&part->rcu_work, hd_struct_free_work); - queue_rcu_work(system_wq, &part->rcu_work); -} - -int hd_ref_init(struct hd_struct *part) -{ - if (percpu_ref_init(&part->ref, hd_struct_free, 0, GFP_KERNEL)) - return -ENOMEM; - return 0; -} - /* * Must be called either with bd_mutex held, before a disk can be opened or * after all disk users are gone. @@ -342,8 +302,8 @@ void delete_partition(struct hd_struct *part) * ->part_tbl is referenced in this part's release handler, so * we have to hold the disk device */ - get_device(disk_to_dev(disk)); rcu_assign_pointer(ptbl->part[part->partno], NULL); + rcu_assign_pointer(ptbl->last_lookup, NULL); kobject_put(part->bdev->bd_holder_dir); device_del(part_to_dev(part)); @@ -353,7 +313,7 @@ void delete_partition(struct hd_struct *part) */ remove_inode_hash(part->bdev->bd_inode); - percpu_ref_kill(&part->ref); + put_device(part_to_dev(part)); } static ssize_t whole_disk_show(struct device *dev, @@ -406,15 +366,11 @@ static struct hd_struct *add_partition(struct gendisk *disk, int partno, if (ptbl->part[partno]) return ERR_PTR(-EBUSY); - p = kzalloc(sizeof(*p), GFP_KERNEL); - if (!p) - return ERR_PTR(-EBUSY); - bdev = bdev_alloc(disk, partno); if (!bdev) - goto out_free; - p->bdev = bdev; + return ERR_PTR(-ENOMEM); + p = bdev->bd_part; pdev = part_to_dev(p); bdev->bd_start_sect = start; @@ -463,13 +419,6 @@ static struct hd_struct *add_partition(struct gendisk *disk, int partno, goto out_del; } - err = hd_ref_init(p); - if (err) { - if (flags & ADDPART_FLAG_WHOLEDISK) - goto out_remove_file; - goto out_del; - } - /* everything is up and running, commence */ bdev_add(bdev, devt); rcu_assign_pointer(ptbl->part[partno], p); @@ -481,11 +430,7 @@ static struct hd_struct *add_partition(struct gendisk *disk, int partno, out_bdput: bdput(bdev); -out_free: - kfree(p); return ERR_PTR(err); -out_remove_file: - device_remove_file(pdev, &dev_attr_whole_disk); out_del: kobject_put(bdev->bd_holder_dir); device_del(pdev); diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c index dc333dbe523281..9e5c2fdfda3629 100644 --- a/drivers/block/drbd/drbd_receiver.c +++ b/drivers/block/drbd/drbd_receiver.c @@ -2802,7 +2802,7 @@ bool drbd_rs_c_min_rate_throttle(struct drbd_device *device) if (c_min_rate == 0) return false; - curr_events = (int)part_stat_read_accum(&disk->part0, sectors) - + curr_events = (int)part_stat_read_accum(disk->part0->bd_part, sectors) - atomic_read(&device->rs_sect_ev); if (atomic_read(&device->ap_actlog_cnt) diff --git a/drivers/block/drbd/drbd_worker.c b/drivers/block/drbd/drbd_worker.c index ba56f3f05312f0..343f56b86bb766 100644 --- a/drivers/block/drbd/drbd_worker.c +++ b/drivers/block/drbd/drbd_worker.c @@ -1678,7 +1678,8 @@ void drbd_rs_controller_reset(struct drbd_device *device) atomic_set(&device->rs_sect_in, 0); atomic_set(&device->rs_sect_ev, 0); device->rs_in_flight = 0; - device->rs_last_events = (int)part_stat_read_accum(&disk->part0, sectors); + device->rs_last_events = + (int)part_stat_read_accum(disk->part0->bd_part, sectors); /* Updating the RCU protected object in place is necessary since this function gets called from atomic context. diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c index b5f68951c9d280..6d84876a9cd0ae 100644 --- a/drivers/block/zram/zram_drv.c +++ b/drivers/block/zram/zram_drv.c @@ -1687,7 +1687,7 @@ static void zram_reset_device(struct zram *zram) zram->disksize = 0; set_capacity_and_notify(zram->disk, 0); - part_stat_set_all(&zram->disk->part0, 0); + part_stat_set_all(zram->disk->part0->bd_part, 0); up_write(&zram->init_lock); /* I/O operation under all of CPU are done so let's free */ diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 48051db006f30c..1b2db4d530ea71 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -1607,7 +1607,7 @@ static blk_qc_t __split_and_process_bio(struct mapped_device *md, * (by eliminating DM's splitting and just using bio_split) */ part_stat_lock(); - __dm_part_stat_sub(&dm_disk(md)->part0, + __dm_part_stat_sub(dm_disk(md)->part0->bd_part, sectors[op_stat_group(bio_op(bio))], ci.sector_count); part_stat_unlock(); @@ -2242,7 +2242,7 @@ EXPORT_SYMBOL_GPL(dm_put); static bool md_in_flight_bios(struct mapped_device *md) { int cpu; - struct hd_struct *part = &dm_disk(md)->part0; + struct hd_struct *part = dm_disk(md)->part0->bd_part; long sum = 0; for_each_possible_cpu(cpu) { diff --git a/drivers/md/md.c b/drivers/md/md.c index 7ce6047c856ea2..3696c2d77a4dd7 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -8441,7 +8441,7 @@ static int is_mddev_idle(struct mddev *mddev, int init) rcu_read_lock(); rdev_for_each_rcu(rdev, mddev) { struct gendisk *disk = rdev->bdev->bd_disk; - curr_events = (int)part_stat_read_accum(&disk->part0, sectors) - + curr_events = (int)part_stat_read_accum(disk->part0->bd_part, sectors) - atomic_read(&disk->sync_io); /* sync IO will cause sync_io to increase before the disk_stats * as sync_io is counted when a request starts, and diff --git a/fs/block_dev.c b/fs/block_dev.c index 2c91c35149787a..a15d1c114a247e 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -39,6 +39,7 @@ struct bdev_inode { struct block_device bdev; + struct hd_struct hd; struct inode vfs_inode; }; @@ -886,6 +887,9 @@ struct block_device *bdev_alloc(struct gendisk *disk, u8 partno) iput(inode); return NULL; } + bdev->bd_part = &BDEV_I(inode)->hd; + memset(bdev->bd_part, 0, sizeof(*bdev->bd_part)); + bdev->bd_part->bdev = bdev; return bdev; } @@ -1276,15 +1280,10 @@ EXPORT_SYMBOL_GPL(bdev_disk_changed); static int __blkdev_get(struct block_device *bdev, fmode_t mode) { struct gendisk *disk = bdev->bd_disk; - int ret; + int ret = 0; if (!bdev->bd_openers) { if (!bdev_is_partition(bdev)) { - ret = -ENXIO; - bdev->bd_part = disk_get_part(disk, 0); - if (!bdev->bd_part) - goto out_clear; - ret = 0; if (disk->fops->open) ret = disk->fops->open(bdev, mode); @@ -1303,7 +1302,7 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode) bdev_disk_changed(bdev, ret == -ENOMEDIUM); if (ret) - goto out_clear; + return ret; } else { struct block_device *whole = bdget_disk(disk, 0); @@ -1312,17 +1311,15 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode) if (ret) { mutex_unlock(&whole->bd_mutex); bdput(whole); - goto out_clear; + return ret; } whole->bd_part_count++; mutex_unlock(&whole->bd_mutex); - bdev->bd_part = disk_get_part(disk, bdev->bd_partno); if (!bdev_nr_sectors(bdev)) { __blkdev_put(whole, mode, 1); bdput(whole); - ret = -ENXIO; - goto out_clear; + return -ENXIO; } set_init_blocksize(bdev); } @@ -1331,7 +1328,6 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode) bdev->bd_bdi = bdi_get(disk->queue->backing_dev_info); } else { if (!bdev_is_partition(bdev)) { - ret = 0; if (bdev->bd_disk->fops->open) ret = bdev->bd_disk->fops->open(bdev, mode); /* the same as first opener case, read comment there */ @@ -1344,11 +1340,6 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode) } bdev->bd_openers++; return 0; - - out_clear: - disk_put_part(bdev->bd_part); - bdev->bd_part = NULL; - return ret; } struct block_device *blkdev_get_no_open(dev_t dev) @@ -1574,18 +1565,12 @@ static void __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part) sync_blockdev(bdev); kill_bdev(bdev); bdev_write_inode(bdev); - - if (!bdev_is_partition(bdev) && disk->fops->release) - disk->fops->release(disk, mode); - - disk_put_part(bdev->bd_part); - bdev->bd_part = NULL; if (bdev_is_partition(bdev)) victim = bdev_whole(bdev); - } else { - if (!bdev_is_partition(bdev) && disk->fops->release) - disk->fops->release(disk, mode); } + + if (!bdev_is_partition(bdev) && disk->fops->release) + disk->fops->release(disk, mode); mutex_unlock(&bdev->bd_mutex); if (victim) { __blkdev_put(victim, mode, 1); diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h index 758cf71c9aa2a6..6edea5c1625909 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -59,7 +59,7 @@ struct block_device { } __randomize_layout; #define bdev_whole(_bdev) \ - ((_bdev)->bd_disk->part0.bdev) + ((_bdev)->bd_disk->part0) #define bdev_kobj(_bdev) \ (&part_to_dev((_bdev)->bd_part)->kobj) diff --git a/include/linux/genhd.h b/include/linux/genhd.h index dcbf9ef7610ea6..df7319da013ccf 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -19,11 +19,12 @@ #include #include -#define dev_to_disk(device) container_of((device), struct gendisk, part0.__dev) #define dev_to_part(device) container_of((device), struct hd_struct, __dev) -#define disk_to_dev(disk) (&(disk)->part0.__dev) #define part_to_dev(part) (&((part)->__dev)) +#define dev_to_disk(device) (dev_to_part(device)->bdev->bd_disk) +#define disk_to_dev(disk) (part_to_dev((disk)->part0->bd_part)) + extern const struct device_type disk_type; extern struct device_type part_type; extern struct class block_class; @@ -51,12 +52,9 @@ struct partition_meta_info { }; struct hd_struct { - struct percpu_ref ref; - struct block_device *bdev; struct device __dev; int partno; - struct rcu_work rcu_work; }; /** @@ -168,7 +166,7 @@ struct gendisk { * helpers. */ struct disk_part_tbl __rcu *part_tbl; - struct hd_struct part0; + struct block_device *part0; const struct block_device_operations *fops; struct request_queue *queue; @@ -278,7 +276,7 @@ extern void set_disk_ro(struct gendisk *disk, int flag); static inline int get_disk_ro(struct gendisk *disk) { - return disk->part0.bdev->bd_read_only; + return disk->part0->bd_read_only; } extern void disk_block_events(struct gendisk *disk); @@ -302,7 +300,7 @@ static inline sector_t bdev_nr_sectors(struct block_device *bdev) static inline sector_t get_capacity(struct gendisk *disk) { - return bdev_nr_sectors(disk->part0.bdev); + return bdev_nr_sectors(disk->part0); } int bdev_disk_changed(struct block_device *bdev, bool invalidate); diff --git a/include/linux/part_stat.h b/include/linux/part_stat.h index 87ad60106e1db0..680de036691ef9 100644 --- a/include/linux/part_stat.h +++ b/include/linux/part_stat.h @@ -59,8 +59,8 @@ static inline void part_stat_set_all(struct hd_struct *part, int value) #define part_stat_add(part, field, addnd) do { \ __part_stat_add((part), field, addnd); \ if ((part)->partno) \ - __part_stat_add(&part_to_disk((part))->part0, \ - field, addnd); \ + __part_stat_add(part_to_disk((part))->part0->bd_part, \ + field, addnd); \ } while (0) #define part_stat_dec(part, field) \ From patchwork Thu Nov 26 13:04:15 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11933571 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id AE0C7C64E75 for ; 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bh=/BYrgHLRPPRgiWcpNwhVxjIWF/zh+iMxzZ+SWBrjyLI=; b=gurJRBIlX7FXQ7rnq9sOo8EDJN 6++ACOTpQV/QDhRYOaBaDJhyOvatwP+hVOR35kPQMgwFzIt23l6//uK87vfc20fBNbFlewKgYYFzx 6NlPcZBNPVgVEKPTd6CLFxY6DmPtF6q2vWliV+XiQVom2Zb7hgsyIRPJH2N7EmSzx7v6J4g5r/ZEy nTKImX9EqOXAgA6N0gLk8No17hoZMMjhozbtgxswMXlHhX02fy0iJnZ1+owrqcvWcl6izZV5Kw21l 1vzjQln1ac4G5hRMu9bof1dGXV4ivP54/tMf87H8mEhycWgtdxkHZ8blE9DkGewzqJWOi9Vf8uTeD xY+D6ObQ==; Received: from [2001:4bb8:18c:1dd6:27b8:b8a1:c13e:ceb1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGze-00048p-3R; Thu, 26 Nov 2020 13:07:26 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , dm-devel@redhat.com, Jan Kara , linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, Chao Yu Subject: [PATCH 37/44] block: switch partition lookup to use struct block_device Date: Thu, 26 Nov 2020 14:04:15 +0100 Message-Id: <20201126130422.92945-38-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201126130422.92945-1-hch@lst.de> References: <20201126130422.92945-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Use struct block_device to lookup partitions on a disk. This removes all usage of struct hd_struct from the I/O path, and this allows removing the percpu refcount in struct hd_struct. Signed-off-by: Christoph Hellwig Acked-by: Coly Li [bcache] Acked-by: Chao Yu [f2fs] Reviewed-by: Jan Kara --- block/bio.c | 4 +- block/blk-core.c | 66 ++++++++++++++---------------- block/blk-flush.c | 2 +- block/blk-mq.c | 9 ++-- block/blk-mq.h | 7 ++-- block/blk.h | 4 +- block/genhd.c | 56 +++++++++++++------------ block/partitions/core.c | 7 +--- drivers/block/drbd/drbd_receiver.c | 2 +- drivers/block/drbd/drbd_worker.c | 2 +- drivers/block/zram/zram_drv.c | 2 +- drivers/md/bcache/request.c | 4 +- drivers/md/dm.c | 4 +- drivers/md/md.c | 4 +- drivers/nvme/target/admin-cmd.c | 20 ++++----- fs/ext4/super.c | 18 +++----- fs/ext4/sysfs.c | 10 +---- fs/f2fs/f2fs.h | 2 +- fs/f2fs/super.c | 6 +-- include/linux/blkdev.h | 8 ++-- include/linux/genhd.h | 4 +- include/linux/part_stat.h | 17 ++++---- 22 files changed, 120 insertions(+), 138 deletions(-) diff --git a/block/bio.c b/block/bio.c index 669bb47a31988e..ebb18136b86f2f 100644 --- a/block/bio.c +++ b/block/bio.c @@ -608,12 +608,12 @@ void bio_truncate(struct bio *bio, unsigned new_size) void guard_bio_eod(struct bio *bio) { sector_t maxsector; - struct hd_struct *part; + struct block_device *part; rcu_read_lock(); part = __disk_get_part(bio->bi_disk, bio->bi_partno); if (part) - maxsector = bdev_nr_sectors(part->bdev); + maxsector = bdev_nr_sectors(part); else maxsector = get_capacity(bio->bi_disk); rcu_read_unlock(); diff --git a/block/blk-core.c b/block/blk-core.c index 9ea70275fc1cfe..cee568389b7e11 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -666,10 +666,9 @@ static int __init setup_fail_make_request(char *str) } __setup("fail_make_request=", setup_fail_make_request); -static bool should_fail_request(struct hd_struct *part, unsigned int bytes) +static bool should_fail_request(struct block_device *part, unsigned int bytes) { - return part->bdev->bd_make_it_fail && - should_fail(&fail_make_request, bytes); + return part->bd_make_it_fail && should_fail(&fail_make_request, bytes); } static int __init fail_make_request_debugfs(void) @@ -684,7 +683,7 @@ late_initcall(fail_make_request_debugfs); #else /* CONFIG_FAIL_MAKE_REQUEST */ -static inline bool should_fail_request(struct hd_struct *part, +static inline bool should_fail_request(struct block_device *part, unsigned int bytes) { return false; @@ -692,11 +691,11 @@ static inline bool should_fail_request(struct hd_struct *part, #endif /* CONFIG_FAIL_MAKE_REQUEST */ -static inline bool bio_check_ro(struct bio *bio, struct hd_struct *part) +static inline bool bio_check_ro(struct bio *bio, struct block_device *part) { const int op = bio_op(bio); - if (part->bdev->bd_read_only && op_is_write(op)) { + if (part->bd_read_only && op_is_write(op)) { char b[BDEVNAME_SIZE]; if (op_is_flush(bio->bi_opf) && !bio_sectors(bio)) @@ -704,7 +703,7 @@ static inline bool bio_check_ro(struct bio *bio, struct hd_struct *part) WARN_ONCE(1, "Trying to write to read-only block-device %s (partno %d)\n", - bio_devname(bio, b), part->partno); + bio_devname(bio, b), part->bd_partno); /* Older lvm-tools actually trigger this */ return false; } @@ -714,8 +713,7 @@ static inline bool bio_check_ro(struct bio *bio, struct hd_struct *part) static noinline int should_fail_bio(struct bio *bio) { - if (should_fail_request(bio->bi_disk->part0->bd_part, - bio->bi_iter.bi_size)) + if (should_fail_request(bio->bi_disk->part0, bio->bi_iter.bi_size)) return -EIO; return 0; } @@ -744,7 +742,7 @@ static inline int bio_check_eod(struct bio *bio, sector_t maxsector) */ static inline int blk_partition_remap(struct bio *bio) { - struct hd_struct *p; + struct block_device *p; int ret = -EIO; rcu_read_lock(); @@ -757,12 +755,12 @@ static inline int blk_partition_remap(struct bio *bio) goto out; if (bio_sectors(bio)) { - if (bio_check_eod(bio, bdev_nr_sectors(p->bdev))) + if (bio_check_eod(bio, bdev_nr_sectors(p))) goto out; - bio->bi_iter.bi_sector += p->bdev->bd_start_sect; - trace_block_bio_remap(bio->bi_disk->queue, bio, part_devt(p), + bio->bi_iter.bi_sector += p->bd_start_sect; + trace_block_bio_remap(bio->bi_disk->queue, bio, p->bd_dev, bio->bi_iter.bi_sector - - p->bdev->bd_start_sect); + p->bd_start_sect); } bio->bi_partno = 0; ret = 0; @@ -832,7 +830,7 @@ static noinline_for_stack bool submit_bio_checks(struct bio *bio) if (unlikely(blk_partition_remap(bio))) goto end_io; } else { - if (unlikely(bio_check_ro(bio, bio->bi_disk->part0->bd_part))) + if (unlikely(bio_check_ro(bio, bio->bi_disk->part0))) goto end_io; if (unlikely(bio_check_eod(bio, get_capacity(bio->bi_disk)))) goto end_io; @@ -1204,7 +1202,7 @@ blk_status_t blk_insert_cloned_request(struct request_queue *q, struct request * return ret; if (rq->rq_disk && - should_fail_request(rq->rq_disk->part0->bd_part, blk_rq_bytes(rq))) + should_fail_request(rq->rq_disk->part0, blk_rq_bytes(rq))) return BLK_STS_IOERR; if (blk_crypto_insert_cloned_request(rq)) @@ -1263,17 +1261,18 @@ unsigned int blk_rq_err_bytes(const struct request *rq) } EXPORT_SYMBOL_GPL(blk_rq_err_bytes); -static void update_io_ticks(struct hd_struct *part, unsigned long now, bool end) +static void update_io_ticks(struct block_device *part, unsigned long now, + bool end) { unsigned long stamp; again: - stamp = READ_ONCE(part->bdev->bd_stamp); + stamp = READ_ONCE(part->bd_stamp); if (unlikely(stamp != now)) { - if (likely(cmpxchg(&part->bdev->bd_stamp, stamp, now) == stamp)) + if (likely(cmpxchg(&part->bd_stamp, stamp, now) == stamp)) __part_stat_add(part, io_ticks, end ? now - stamp : 1); } - if (part->partno) { - part = part_to_disk(part)->part0->bd_part; + if (part->bd_partno) { + part = bdev_whole(part); goto again; } } @@ -1282,11 +1281,9 @@ static void blk_account_io_completion(struct request *req, unsigned int bytes) { if (req->part && blk_do_io_stat(req)) { const int sgrp = op_stat_group(req_op(req)); - struct hd_struct *part; part_stat_lock(); - part = req->part; - part_stat_add(part, sectors[sgrp], bytes >> 9); + part_stat_add(req->part, sectors[sgrp], bytes >> 9); part_stat_unlock(); } } @@ -1301,14 +1298,11 @@ void blk_account_io_done(struct request *req, u64 now) if (req->part && blk_do_io_stat(req) && !(req->rq_flags & RQF_FLUSH_SEQ)) { const int sgrp = op_stat_group(req_op(req)); - struct hd_struct *part; part_stat_lock(); - part = req->part; - - update_io_ticks(part, jiffies, true); - part_stat_inc(part, ios[sgrp]); - part_stat_add(part, nsecs[sgrp], now - req->start_time_ns); + update_io_ticks(req->part, jiffies, true); + part_stat_inc(req->part, ios[sgrp]); + part_stat_add(req->part, nsecs[sgrp], now - req->start_time_ns); part_stat_unlock(); } } @@ -1325,7 +1319,7 @@ void blk_account_io_start(struct request *rq) part_stat_unlock(); } -static unsigned long __part_start_io_acct(struct hd_struct *part, +static unsigned long __part_start_io_acct(struct block_device *part, unsigned int sectors, unsigned int op) { const int sgrp = op_stat_group(op); @@ -1341,7 +1335,7 @@ static unsigned long __part_start_io_acct(struct hd_struct *part, return now; } -unsigned long part_start_io_acct(struct gendisk *disk, struct hd_struct **part, +unsigned long part_start_io_acct(struct gendisk *disk, struct block_device **part, struct bio *bio) { *part = disk_map_sector_rcu(disk, bio->bi_iter.bi_sector); @@ -1353,11 +1347,11 @@ EXPORT_SYMBOL_GPL(part_start_io_acct); unsigned long disk_start_io_acct(struct gendisk *disk, unsigned int sectors, unsigned int op) { - return __part_start_io_acct(disk->part0->bd_part, sectors, op); + return __part_start_io_acct(disk->part0, sectors, op); } EXPORT_SYMBOL(disk_start_io_acct); -static void __part_end_io_acct(struct hd_struct *part, unsigned int op, +static void __part_end_io_acct(struct block_device *part, unsigned int op, unsigned long start_time) { const int sgrp = op_stat_group(op); @@ -1371,7 +1365,7 @@ static void __part_end_io_acct(struct hd_struct *part, unsigned int op, part_stat_unlock(); } -void part_end_io_acct(struct hd_struct *part, struct bio *bio, +void part_end_io_acct(struct block_device *part, struct bio *bio, unsigned long start_time) { __part_end_io_acct(part, bio_op(bio), start_time); @@ -1381,7 +1375,7 @@ EXPORT_SYMBOL_GPL(part_end_io_acct); void disk_end_io_acct(struct gendisk *disk, unsigned int op, unsigned long start_time) { - __part_end_io_acct(disk->part0->bd_part, op, start_time); + __part_end_io_acct(disk->part0, op, start_time); } EXPORT_SYMBOL(disk_end_io_acct); diff --git a/block/blk-flush.c b/block/blk-flush.c index fcd0a60574dff8..9507dcdd58814c 100644 --- a/block/blk-flush.c +++ b/block/blk-flush.c @@ -139,7 +139,7 @@ static void blk_flush_queue_rq(struct request *rq, bool add_front) static void blk_account_io_flush(struct request *rq) { - struct hd_struct *part = rq->rq_disk->part0->bd_part; + struct block_device *part = rq->rq_disk->part0; part_stat_lock(); part_stat_inc(part, ios[STAT_FLUSH]); diff --git a/block/blk-mq.c b/block/blk-mq.c index 55bcee5dc0320c..a2593748fa5342 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -95,7 +95,7 @@ static void blk_mq_hctx_clear_pending(struct blk_mq_hw_ctx *hctx, } struct mq_inflight { - struct hd_struct *part; + struct block_device *part; unsigned int inflight[2]; }; @@ -111,7 +111,8 @@ static bool blk_mq_check_inflight(struct blk_mq_hw_ctx *hctx, return true; } -unsigned int blk_mq_in_flight(struct request_queue *q, struct hd_struct *part) +unsigned int blk_mq_in_flight(struct request_queue *q, + struct block_device *part) { struct mq_inflight mi = { .part = part }; @@ -120,8 +121,8 @@ unsigned int blk_mq_in_flight(struct request_queue *q, struct hd_struct *part) return mi.inflight[0] + mi.inflight[1]; } -void blk_mq_in_flight_rw(struct request_queue *q, struct hd_struct *part, - unsigned int inflight[2]) +void blk_mq_in_flight_rw(struct request_queue *q, struct block_device *part, + unsigned int inflight[2]) { struct mq_inflight mi = { .part = part }; diff --git a/block/blk-mq.h b/block/blk-mq.h index a52703c98b7736..c696515766c780 100644 --- a/block/blk-mq.h +++ b/block/blk-mq.h @@ -182,9 +182,10 @@ static inline bool blk_mq_hw_queue_mapped(struct blk_mq_hw_ctx *hctx) return hctx->nr_ctx && hctx->tags; } -unsigned int blk_mq_in_flight(struct request_queue *q, struct hd_struct *part); -void blk_mq_in_flight_rw(struct request_queue *q, struct hd_struct *part, - unsigned int inflight[2]); +unsigned int blk_mq_in_flight(struct request_queue *q, + struct block_device *part); +void blk_mq_in_flight_rw(struct request_queue *q, struct block_device *part, + unsigned int inflight[2]); static inline void blk_mq_put_dispatch_budget(struct request_queue *q) { diff --git a/block/blk.h b/block/blk.h index 32ac41f7557fcc..d5bf8f3a078186 100644 --- a/block/blk.h +++ b/block/blk.h @@ -215,7 +215,7 @@ static inline void elevator_exit(struct request_queue *q, __elevator_exit(q, e); } -struct hd_struct *__disk_get_part(struct gendisk *disk, int partno); +struct block_device *__disk_get_part(struct gendisk *disk, int partno); ssize_t part_size_show(struct device *dev, struct device_attribute *attr, char *buf); @@ -348,7 +348,7 @@ void blk_queue_free_zone_bitmaps(struct request_queue *q); static inline void blk_queue_free_zone_bitmaps(struct request_queue *q) {} #endif -struct hd_struct *disk_map_sector_rcu(struct gendisk *disk, sector_t sector); +struct block_device *disk_map_sector_rcu(struct gendisk *disk, sector_t sector); int blk_alloc_devt(struct hd_struct *part, dev_t *devt); void blk_free_devt(dev_t devt); diff --git a/block/genhd.c b/block/genhd.c index eaa5d65ae826b8..282fde159bd125 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -118,7 +118,7 @@ static void part_stat_read_all(struct hd_struct *part, struct disk_stats *stat) } } -static unsigned int part_in_flight(struct hd_struct *part) +static unsigned int part_in_flight(struct block_device *part) { unsigned int inflight = 0; int cpu; @@ -133,7 +133,8 @@ static unsigned int part_in_flight(struct hd_struct *part) return inflight; } -static void part_in_flight_rw(struct hd_struct *part, unsigned int inflight[2]) +static void part_in_flight_rw(struct block_device *part, + unsigned int inflight[2]) { int cpu; @@ -149,7 +150,7 @@ static void part_in_flight_rw(struct hd_struct *part, unsigned int inflight[2]) inflight[1] = 0; } -struct hd_struct *__disk_get_part(struct gendisk *disk, int partno) +struct block_device *__disk_get_part(struct gendisk *disk, int partno) { struct disk_part_tbl *ptbl = rcu_dereference(disk->part_tbl); @@ -174,15 +175,18 @@ struct hd_struct *__disk_get_part(struct gendisk *disk, int partno) */ struct hd_struct *disk_get_part(struct gendisk *disk, int partno) { - struct hd_struct *part; + struct block_device *part; rcu_read_lock(); part = __disk_get_part(disk, partno); - if (part) - get_device(part_to_dev(part)); - rcu_read_unlock(); + if (!part) { + rcu_read_unlock(); + return NULL; + } - return part; + get_device(part_to_dev(part->bd_part)); + rcu_read_unlock(); + return part->bd_part; } /** @@ -256,19 +260,19 @@ struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter) /* iterate to the next partition */ for (; piter->idx != end; piter->idx += inc) { - struct hd_struct *part; + struct block_device *part; part = rcu_dereference(ptbl->part[piter->idx]); if (!part) continue; - if (!bdev_nr_sectors(part->bdev) && + if (!bdev_nr_sectors(part) && !(piter->flags & DISK_PITER_INCL_EMPTY) && !(piter->flags & DISK_PITER_INCL_EMPTY_PART0 && piter->idx == 0)) continue; - get_device(part_to_dev(part)); - piter->part = part; + get_device(part_to_dev(part->bd_part)); + piter->part = part->bd_part; piter->idx += inc; break; } @@ -295,10 +299,10 @@ void disk_part_iter_exit(struct disk_part_iter *piter) } EXPORT_SYMBOL_GPL(disk_part_iter_exit); -static inline int sector_in_part(struct hd_struct *part, sector_t sector) +static inline int sector_in_part(struct block_device *part, sector_t sector) { - return part->bdev->bd_start_sect <= sector && - sector < part->bdev->bd_start_sect + bdev_nr_sectors(part->bdev); + return part->bd_start_sect <= sector && + sector < part->bd_start_sect + bdev_nr_sectors(part); } /** @@ -316,10 +320,10 @@ static inline int sector_in_part(struct hd_struct *part, sector_t sector) * Found partition on success, part0 is returned if no partition matches * or the matched partition is being deleted. */ -struct hd_struct *disk_map_sector_rcu(struct gendisk *disk, sector_t sector) +struct block_device *disk_map_sector_rcu(struct gendisk *disk, sector_t sector) { struct disk_part_tbl *ptbl; - struct hd_struct *part; + struct block_device *part; int i; rcu_read_lock(); @@ -338,7 +342,7 @@ struct hd_struct *disk_map_sector_rcu(struct gendisk *disk, sector_t sector) } } - part = disk->part0->bd_part; + part = disk->part0; out_unlock: rcu_read_unlock(); return part; @@ -874,7 +878,7 @@ void del_gendisk(struct gendisk *disk) kobject_put(disk->part0->bd_holder_dir); kobject_put(disk->slave_dir); - part_stat_set_all(disk->part0->bd_part, 0); + part_stat_set_all(disk->part0, 0); disk->part0->bd_stamp = 0; if (!sysfs_deprecated) sysfs_remove_link(block_depr, dev_name(disk_to_dev(disk))); @@ -1181,9 +1185,9 @@ ssize_t part_stat_show(struct device *dev, part_stat_read_all(p, &stat); if (queue_is_mq(q)) - inflight = blk_mq_in_flight(q, p); + inflight = blk_mq_in_flight(q, p->bdev); else - inflight = part_in_flight(p); + inflight = part_in_flight(p->bdev); return sprintf(buf, "%8lu %8lu %8llu %8u " @@ -1223,9 +1227,9 @@ ssize_t part_inflight_show(struct device *dev, struct device_attribute *attr, unsigned int inflight[2]; if (queue_is_mq(q)) - blk_mq_in_flight_rw(q, p, inflight); + blk_mq_in_flight_rw(q, p->bdev, inflight); else - part_in_flight_rw(p, inflight); + part_in_flight_rw(p->bdev, inflight); return sprintf(buf, "%8u %8u\n", inflight[0], inflight[1]); } @@ -1498,9 +1502,9 @@ static int diskstats_show(struct seq_file *seqf, void *v) while ((hd = disk_part_iter_next(&piter))) { part_stat_read_all(hd, &stat); if (queue_is_mq(gp->queue)) - inflight = blk_mq_in_flight(gp->queue, hd); + inflight = blk_mq_in_flight(gp->queue, hd->bdev); else - inflight = part_in_flight(hd); + inflight = part_in_flight(hd->bdev); seq_printf(seqf, "%4d %7d %s " "%lu %lu %lu %u " @@ -1618,7 +1622,7 @@ struct gendisk *__alloc_disk_node(int minors, int node_id) goto out_bdput; ptbl = rcu_dereference_protected(disk->part_tbl, 1); - rcu_assign_pointer(ptbl->part[0], disk->part0->bd_part); + rcu_assign_pointer(ptbl->part[0], disk->part0); disk->minors = minors; rand_initialize_disk(disk); diff --git a/block/partitions/core.c b/block/partitions/core.c index 9c7e6730fa6098..aba750825aa0d0 100644 --- a/block/partitions/core.c +++ b/block/partitions/core.c @@ -298,12 +298,9 @@ void delete_partition(struct hd_struct *part) struct disk_part_tbl *ptbl = rcu_dereference_protected(disk->part_tbl, 1); - /* - * ->part_tbl is referenced in this part's release handler, so - * we have to hold the disk device - */ rcu_assign_pointer(ptbl->part[part->partno], NULL); rcu_assign_pointer(ptbl->last_lookup, NULL); + kobject_put(part->bdev->bd_holder_dir); device_del(part_to_dev(part)); @@ -421,7 +418,7 @@ static struct hd_struct *add_partition(struct gendisk *disk, int partno, /* everything is up and running, commence */ bdev_add(bdev, devt); - rcu_assign_pointer(ptbl->part[partno], p); + rcu_assign_pointer(ptbl->part[partno], bdev); /* suppress uevent if the disk suppresses it */ if (!dev_get_uevent_suppress(ddev)) diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c index 9e5c2fdfda3629..09c86ef3f0fd93 100644 --- a/drivers/block/drbd/drbd_receiver.c +++ b/drivers/block/drbd/drbd_receiver.c @@ -2802,7 +2802,7 @@ bool drbd_rs_c_min_rate_throttle(struct drbd_device *device) if (c_min_rate == 0) return false; - curr_events = (int)part_stat_read_accum(disk->part0->bd_part, sectors) - + curr_events = (int)part_stat_read_accum(disk->part0, sectors) - atomic_read(&device->rs_sect_ev); if (atomic_read(&device->ap_actlog_cnt) diff --git a/drivers/block/drbd/drbd_worker.c b/drivers/block/drbd/drbd_worker.c index 343f56b86bb766..02044ab7f767d5 100644 --- a/drivers/block/drbd/drbd_worker.c +++ b/drivers/block/drbd/drbd_worker.c @@ -1679,7 +1679,7 @@ void drbd_rs_controller_reset(struct drbd_device *device) atomic_set(&device->rs_sect_ev, 0); device->rs_in_flight = 0; device->rs_last_events = - (int)part_stat_read_accum(disk->part0->bd_part, sectors); + (int)part_stat_read_accum(disk->part0, sectors); /* Updating the RCU protected object in place is necessary since this function gets called from atomic context. diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c index 6d84876a9cd0ae..dc8957d173d37c 100644 --- a/drivers/block/zram/zram_drv.c +++ b/drivers/block/zram/zram_drv.c @@ -1687,7 +1687,7 @@ static void zram_reset_device(struct zram *zram) zram->disksize = 0; set_capacity_and_notify(zram->disk, 0); - part_stat_set_all(zram->disk->part0->bd_part, 0); + part_stat_set_all(zram->disk->part0, 0); up_write(&zram->init_lock); /* I/O operation under all of CPU are done so let's free */ diff --git a/drivers/md/bcache/request.c b/drivers/md/bcache/request.c index afac8d07c1bd00..85b1f2a9b72d68 100644 --- a/drivers/md/bcache/request.c +++ b/drivers/md/bcache/request.c @@ -475,7 +475,7 @@ struct search { unsigned int read_dirty_data:1; unsigned int cache_missed:1; - struct hd_struct *part; + struct block_device *part; unsigned long start_time; struct btree_op op; @@ -1073,7 +1073,7 @@ struct detached_dev_io_private { unsigned long start_time; bio_end_io_t *bi_end_io; void *bi_private; - struct hd_struct *part; + struct block_device *part; }; static void detached_dev_end_io(struct bio *bio) diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 1b2db4d530ea71..176adcff56b380 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -1607,7 +1607,7 @@ static blk_qc_t __split_and_process_bio(struct mapped_device *md, * (by eliminating DM's splitting and just using bio_split) */ part_stat_lock(); - __dm_part_stat_sub(dm_disk(md)->part0->bd_part, + __dm_part_stat_sub(dm_disk(md)->part0, sectors[op_stat_group(bio_op(bio))], ci.sector_count); part_stat_unlock(); @@ -2242,7 +2242,7 @@ EXPORT_SYMBOL_GPL(dm_put); static bool md_in_flight_bios(struct mapped_device *md) { int cpu; - struct hd_struct *part = dm_disk(md)->part0->bd_part; + struct block_device *part = dm_disk(md)->part0; long sum = 0; for_each_possible_cpu(cpu) { diff --git a/drivers/md/md.c b/drivers/md/md.c index 3696c2d77a4dd7..0065736f05b428 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -464,7 +464,7 @@ struct md_io { bio_end_io_t *orig_bi_end_io; void *orig_bi_private; unsigned long start_time; - struct hd_struct *part; + struct block_device *part; }; static void md_end_io(struct bio *bio) @@ -8441,7 +8441,7 @@ static int is_mddev_idle(struct mddev *mddev, int init) rcu_read_lock(); rdev_for_each_rcu(rdev, mddev) { struct gendisk *disk = rdev->bdev->bd_disk; - curr_events = (int)part_stat_read_accum(disk->part0->bd_part, sectors) - + curr_events = (int)part_stat_read_accum(disk->part0, sectors) - atomic_read(&disk->sync_io); /* sync IO will cause sync_io to increase before the disk_stats * as sync_io is counted when a request starts, and diff --git a/drivers/nvme/target/admin-cmd.c b/drivers/nvme/target/admin-cmd.c index dca34489a1dc9e..8d90235e4fcc5a 100644 --- a/drivers/nvme/target/admin-cmd.c +++ b/drivers/nvme/target/admin-cmd.c @@ -89,12 +89,12 @@ static u16 nvmet_get_smart_log_nsid(struct nvmet_req *req, if (!ns->bdev) goto out; - host_reads = part_stat_read(ns->bdev->bd_part, ios[READ]); - data_units_read = DIV_ROUND_UP(part_stat_read(ns->bdev->bd_part, - sectors[READ]), 1000); - host_writes = part_stat_read(ns->bdev->bd_part, ios[WRITE]); - data_units_written = DIV_ROUND_UP(part_stat_read(ns->bdev->bd_part, - sectors[WRITE]), 1000); + host_reads = part_stat_read(ns->bdev, ios[READ]); + data_units_read = + DIV_ROUND_UP(part_stat_read(ns->bdev, sectors[READ]), 1000); + host_writes = part_stat_read(ns->bdev, ios[WRITE]); + data_units_written = + DIV_ROUND_UP(part_stat_read(ns->bdev, sectors[WRITE]), 1000); put_unaligned_le64(host_reads, &slog->host_reads[0]); put_unaligned_le64(data_units_read, &slog->data_units_read[0]); @@ -120,12 +120,12 @@ static u16 nvmet_get_smart_log_all(struct nvmet_req *req, /* we don't have the right data for file backed ns */ if (!ns->bdev) continue; - host_reads += part_stat_read(ns->bdev->bd_part, ios[READ]); + host_reads += part_stat_read(ns->bdev, ios[READ]); data_units_read += DIV_ROUND_UP( - part_stat_read(ns->bdev->bd_part, sectors[READ]), 1000); - host_writes += part_stat_read(ns->bdev->bd_part, ios[WRITE]); + part_stat_read(ns->bdev, sectors[READ]), 1000); + host_writes += part_stat_read(ns->bdev, ios[WRITE]); data_units_written += DIV_ROUND_UP( - part_stat_read(ns->bdev->bd_part, sectors[WRITE]), 1000); + part_stat_read(ns->bdev, sectors[WRITE]), 1000); } put_unaligned_le64(host_reads, &slog->host_reads[0]); diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 6633b20224d509..c303a0ff0b1701 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -4048,9 +4048,8 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent) sbi->s_sb = sb; sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS; sbi->s_sb_block = sb_block; - if (sb->s_bdev->bd_part) - sbi->s_sectors_written_start = - part_stat_read(sb->s_bdev->bd_part, sectors[STAT_WRITE]); + sbi->s_sectors_written_start = + part_stat_read(sb->s_bdev, sectors[STAT_WRITE]); /* Cleanup superblock name */ strreplace(sb->s_id, '/', '!'); @@ -5509,15 +5508,10 @@ static int ext4_commit_super(struct super_block *sb, int sync) */ if (!(sb->s_flags & SB_RDONLY)) ext4_update_tstamp(es, s_wtime); - if (sb->s_bdev->bd_part) - es->s_kbytes_written = - cpu_to_le64(EXT4_SB(sb)->s_kbytes_written + - ((part_stat_read(sb->s_bdev->bd_part, - sectors[STAT_WRITE]) - - EXT4_SB(sb)->s_sectors_written_start) >> 1)); - else - es->s_kbytes_written = - cpu_to_le64(EXT4_SB(sb)->s_kbytes_written); + es->s_kbytes_written = + cpu_to_le64(EXT4_SB(sb)->s_kbytes_written + + ((part_stat_read(sb->s_bdev, sectors[STAT_WRITE]) - + EXT4_SB(sb)->s_sectors_written_start) >> 1)); if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter)) ext4_free_blocks_count_set(es, EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive( diff --git a/fs/ext4/sysfs.c b/fs/ext4/sysfs.c index 4e27fe6ed3ae6a..075aa3a19ff5f1 100644 --- a/fs/ext4/sysfs.c +++ b/fs/ext4/sysfs.c @@ -62,11 +62,8 @@ static ssize_t session_write_kbytes_show(struct ext4_sb_info *sbi, char *buf) { struct super_block *sb = sbi->s_buddy_cache->i_sb; - if (!sb->s_bdev->bd_part) - return snprintf(buf, PAGE_SIZE, "0\n"); return snprintf(buf, PAGE_SIZE, "%lu\n", - (part_stat_read(sb->s_bdev->bd_part, - sectors[STAT_WRITE]) - + (part_stat_read(sb->s_bdev, sectors[STAT_WRITE]) - sbi->s_sectors_written_start) >> 1); } @@ -74,12 +71,9 @@ static ssize_t lifetime_write_kbytes_show(struct ext4_sb_info *sbi, char *buf) { struct super_block *sb = sbi->s_buddy_cache->i_sb; - if (!sb->s_bdev->bd_part) - return snprintf(buf, PAGE_SIZE, "0\n"); return snprintf(buf, PAGE_SIZE, "%llu\n", (unsigned long long)(sbi->s_kbytes_written + - ((part_stat_read(sb->s_bdev->bd_part, - sectors[STAT_WRITE]) - + ((part_stat_read(sb->s_bdev, sectors[STAT_WRITE]) - EXT4_SB(sb)->s_sectors_written_start) >> 1))); } diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index cb700d79729680..49681a8d2b14a5 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -1675,7 +1675,7 @@ static inline bool f2fs_is_multi_device(struct f2fs_sb_info *sbi) * and the return value is in kbytes. s is of struct f2fs_sb_info. */ #define BD_PART_WRITTEN(s) \ -(((u64)part_stat_read((s)->sb->s_bdev->bd_part, sectors[STAT_WRITE]) - \ + (((u64)part_stat_read((s)->sb->s_bdev, sectors[STAT_WRITE]) - \ (s)->sectors_written_start) >> 1) static inline void f2fs_update_time(struct f2fs_sb_info *sbi, int type) diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index d4e7fab352bacb..af9f449da64bac 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -3700,10 +3700,8 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent) } /* For write statistics */ - if (sb->s_bdev->bd_part) - sbi->sectors_written_start = - (u64)part_stat_read(sb->s_bdev->bd_part, - sectors[STAT_WRITE]); + sbi->sectors_written_start = + (u64)part_stat_read(sb->s_bdev, sectors[STAT_WRITE]); /* Read accumulated write IO statistics if exists */ seg_i = CURSEG_I(sbi, CURSEG_HOT_NODE); diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 619adea5709853..1d4be1fc6007c5 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -191,7 +191,7 @@ struct request { }; struct gendisk *rq_disk; - struct hd_struct *part; + struct block_device *part; #ifdef CONFIG_BLK_RQ_ALLOC_TIME /* Time that the first bio started allocating this request. */ u64 alloc_time_ns; @@ -1943,9 +1943,9 @@ unsigned long disk_start_io_acct(struct gendisk *disk, unsigned int sectors, void disk_end_io_acct(struct gendisk *disk, unsigned int op, unsigned long start_time); -unsigned long part_start_io_acct(struct gendisk *disk, struct hd_struct **part, - struct bio *bio); -void part_end_io_acct(struct hd_struct *part, struct bio *bio, +unsigned long part_start_io_acct(struct gendisk *disk, + struct block_device **part, struct bio *bio); +void part_end_io_acct(struct block_device *part, struct bio *bio, unsigned long start_time); /** diff --git a/include/linux/genhd.h b/include/linux/genhd.h index df7319da013ccf..fe6fee77e2b9df 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -131,8 +131,8 @@ enum { struct disk_part_tbl { struct rcu_head rcu_head; int len; - struct hd_struct __rcu *last_lookup; - struct hd_struct __rcu *part[]; + struct block_device __rcu *last_lookup; + struct block_device __rcu *part[]; }; struct disk_events; diff --git a/include/linux/part_stat.h b/include/linux/part_stat.h index 680de036691ef9..d2558121d48c00 100644 --- a/include/linux/part_stat.h +++ b/include/linux/part_stat.h @@ -25,26 +25,26 @@ struct disk_stats { #define part_stat_unlock() preempt_enable() #define part_stat_get_cpu(part, field, cpu) \ - (per_cpu_ptr((part)->bdev->bd_stats, (cpu))->field) + (per_cpu_ptr((part)->bd_stats, (cpu))->field) #define part_stat_get(part, field) \ part_stat_get_cpu(part, field, smp_processor_id()) #define part_stat_read(part, field) \ ({ \ - typeof((part)->bdev->bd_stats->field) res = 0; \ + typeof((part)->bd_stats->field) res = 0; \ unsigned int _cpu; \ for_each_possible_cpu(_cpu) \ - res += per_cpu_ptr((part)->bdev->bd_stats, _cpu)->field; \ + res += per_cpu_ptr((part)->bd_stats, _cpu)->field; \ res; \ }) -static inline void part_stat_set_all(struct hd_struct *part, int value) +static inline void part_stat_set_all(struct block_device *part, int value) { int i; for_each_possible_cpu(i) - memset(per_cpu_ptr(part->bdev->bd_stats, i), value, + memset(per_cpu_ptr(part->bd_stats, i), value, sizeof(struct disk_stats)); } @@ -54,13 +54,12 @@ static inline void part_stat_set_all(struct hd_struct *part, int value) part_stat_read(part, field[STAT_DISCARD])) #define __part_stat_add(part, field, addnd) \ - __this_cpu_add((part)->bdev->bd_stats->field, addnd) + __this_cpu_add((part)->bd_stats->field, addnd) #define part_stat_add(part, field, addnd) do { \ __part_stat_add((part), field, addnd); \ - if ((part)->partno) \ - __part_stat_add(part_to_disk((part))->part0->bd_part, \ - field, addnd); \ + if ((part)->bd_partno) \ + __part_stat_add(bdev_whole(part), field, addnd); \ } while (0) #define part_stat_dec(part, field) \ From patchwork Thu Nov 26 13:04:16 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11933557 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C606EC64E7D for ; Thu, 26 Nov 2020 13:07:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7A03321D46 for ; 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b=a6KobDUdBvFvOtg10YIr/QNOeo sDh6VSKNKTgNQwrwfVGvA5vslYqQ9sh0UOJ1/sVJWD/LRdVUckr9+WOvb6ej3uTXSoOdchQ8+BuYd EhSuI63J8nHrZeb1mB8cxgli3I6A52IFF/gP+JL3d6gqgtyNMYLsmQdFnNSx70JbQGws4j6SbghPg gwHWH71gyFrFdL9Rxvkb1Jinc2iEDo0aXjqMMYpSOJw9CX2DgmQipN0dErhxgVJ6lbzqz6qYA9F5T /FZpnLY4JIgJuPLFMyzbJskwzfwLKohZB6gkbXBF2fwxoZBSm/wgGkM9duFxa3tzPzAS+LORFrFAG lwmn0ATg==; Received: from [2001:4bb8:18c:1dd6:27b8:b8a1:c13e:ceb1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGzf-00049P-G5; Thu, 26 Nov 2020 13:07:28 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , dm-devel@redhat.com, Jan Kara , linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 38/44] block: remove the partno field from struct hd_struct Date: Thu, 26 Nov 2020 14:04:16 +0100 Message-Id: <20201126130422.92945-39-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201126130422.92945-1-hch@lst.de> References: <20201126130422.92945-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Just use the bd_partno field in struct block_device everywhere. Signed-off-by: Christoph Hellwig Reviewed-by: Jan Kara --- block/genhd.c | 12 ++++++------ block/partitions/core.c | 9 ++++----- include/linux/genhd.h | 1 - init/do_mounts.c | 2 +- 4 files changed, 11 insertions(+), 13 deletions(-) diff --git a/block/genhd.c b/block/genhd.c index 282fde159bd125..a85ffd7385718d 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -578,8 +578,8 @@ int blk_alloc_devt(struct hd_struct *part, dev_t *devt) int idx; /* in consecutive minor range? */ - if (part->partno < disk->minors) { - *devt = MKDEV(disk->major, disk->first_minor + part->partno); + if (part->bdev->bd_partno < disk->minors) { + *devt = MKDEV(disk->major, disk->first_minor + part->bdev->bd_partno); return 0; } @@ -853,7 +853,7 @@ void del_gendisk(struct gendisk *disk) disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY | DISK_PITER_REVERSE); while ((part = disk_part_iter_next(&piter))) { - invalidate_partition(disk, part->partno); + invalidate_partition(disk, part->bdev->bd_partno); delete_partition(part); } disk_part_iter_exit(&piter); @@ -997,7 +997,7 @@ void __init printk_all_partitions(void) printk("%s%s %10llu %s %s", is_part0 ? "" : " ", bdevt_str(part_devt(part), devt_buf), bdev_nr_sectors(part->bdev) >> 1, - disk_name(disk, part->partno, name_buf), + disk_name(disk, part->bdev->bd_partno, name_buf), part->bdev->bd_meta_info ? part->bdev->bd_meta_info->uuid : ""); if (is_part0) { @@ -1091,7 +1091,7 @@ static int show_partition(struct seq_file *seqf, void *v) seq_printf(seqf, "%4d %7d %10llu %s\n", MAJOR(part_devt(part)), MINOR(part_devt(part)), bdev_nr_sectors(part->bdev) >> 1, - disk_name(sgp, part->partno, buf)); + disk_name(sgp, part->bdev->bd_partno, buf)); disk_part_iter_exit(&piter); return 0; @@ -1514,7 +1514,7 @@ static int diskstats_show(struct seq_file *seqf, void *v) "%lu %u" "\n", MAJOR(part_devt(hd)), MINOR(part_devt(hd)), - disk_name(gp, hd->partno, buf), + disk_name(gp, hd->bdev->bd_partno, buf), stat.ios[STAT_READ], stat.merges[STAT_READ], stat.sectors[STAT_READ], diff --git a/block/partitions/core.c b/block/partitions/core.c index aba750825aa0d0..ecc3228a086956 100644 --- a/block/partitions/core.c +++ b/block/partitions/core.c @@ -184,7 +184,7 @@ static ssize_t part_partition_show(struct device *dev, { struct hd_struct *p = dev_to_part(dev); - return sprintf(buf, "%d\n", p->partno); + return sprintf(buf, "%d\n", p->bdev->bd_partno); } static ssize_t part_start_show(struct device *dev, @@ -274,7 +274,7 @@ static int part_uevent(struct device *dev, struct kobj_uevent_env *env) { struct hd_struct *part = dev_to_part(dev); - add_uevent_var(env, "PARTN=%u", part->partno); + add_uevent_var(env, "PARTN=%u", part->bdev->bd_partno); if (part->bdev->bd_meta_info && part->bdev->bd_meta_info->volname[0]) add_uevent_var(env, "PARTNAME=%s", part->bdev->bd_meta_info->volname); @@ -298,7 +298,7 @@ void delete_partition(struct hd_struct *part) struct disk_part_tbl *ptbl = rcu_dereference_protected(disk->part_tbl, 1); - rcu_assign_pointer(ptbl->part[part->partno], NULL); + rcu_assign_pointer(ptbl->part[part->bdev->bd_partno], NULL); rcu_assign_pointer(ptbl->last_lookup, NULL); kobject_put(part->bdev->bd_holder_dir); @@ -372,7 +372,6 @@ static struct hd_struct *add_partition(struct gendisk *disk, int partno, bdev->bd_start_sect = start; bdev_set_nr_sectors(bdev, len); - p->partno = partno; bdev->bd_read_only = get_disk_ro(disk); if (info) { @@ -445,7 +444,7 @@ static bool partition_overlaps(struct gendisk *disk, sector_t start, disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY); while ((part = disk_part_iter_next(&piter))) { - if (part->partno == skip_partno || + if (part->bdev->bd_partno == skip_partno || start >= part->bdev->bd_start_sect + bdev_nr_sectors(part->bdev) || start + length <= part->bdev->bd_start_sect) diff --git a/include/linux/genhd.h b/include/linux/genhd.h index fe6fee77e2b9df..3c13d4708e3f9d 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -54,7 +54,6 @@ struct partition_meta_info { struct hd_struct { struct block_device *bdev; struct device __dev; - int partno; }; /** diff --git a/init/do_mounts.c b/init/do_mounts.c index 368ccb71850126..86bef93e72ebd6 100644 --- a/init/do_mounts.c +++ b/init/do_mounts.c @@ -136,7 +136,7 @@ static dev_t devt_from_partuuid(const char *uuid_str) struct hd_struct *part; part = disk_get_part(dev_to_disk(dev), - dev_to_part(dev)->partno + offset); + dev_to_part(dev)->bdev->bd_partno + offset); if (part) { devt = part_devt(part); put_device(part_to_dev(part)); From patchwork Thu Nov 26 13:04:17 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11933561 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EF55CC83018 for ; Thu, 26 Nov 2020 13:07:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A168521D7E for ; 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b=Ps46omJJtF22CamxjjwC6dUdRb xQI6S5cYvUoOUo66OCOAghh7MfxTKAjOflxIy05K2Lo4XpZxkXe8AqXAwrZYq8syv7GPule4CTa55 hxqPQs17t63UtRYI79VnS8uysK/1mH8NfQmbNBEueb25mxmALpgmPpsCAAFymLc7Ev6Glt9v1Gt97 VuFcGw3NXCtZrdmecHp2i9RnW7Ng5+oQI7sEXPLUXYMSmk4O5vP90EXX1ULOy45g/RusLso9BYTv9 i79QGkZ33g8nfIBzUpCNv9JEtuRf9ViNdkbKqkLykiKXIz2IISS71BNU1W7GK+aPfPTqDbwdfNa1P aaiqFDpA==; Received: from [2001:4bb8:18c:1dd6:27b8:b8a1:c13e:ceb1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGzi-0004AA-8h; Thu, 26 Nov 2020 13:07:30 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , dm-devel@redhat.com, Jan Kara , linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 39/44] block: pass a block_device to blk_alloc_devt Date: Thu, 26 Nov 2020 14:04:17 +0100 Message-Id: <20201126130422.92945-40-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201126130422.92945-1-hch@lst.de> References: <20201126130422.92945-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Pass the block_device actually needed instead of the hd_struct. Signed-off-by: Christoph Hellwig Reviewed-by: Jan Kara --- block/blk.h | 2 +- block/genhd.c | 14 +++++++------- block/partitions/core.c | 2 +- 3 files changed, 9 insertions(+), 9 deletions(-) diff --git a/block/blk.h b/block/blk.h index d5bf8f3a078186..9657c6da7c770c 100644 --- a/block/blk.h +++ b/block/blk.h @@ -350,7 +350,7 @@ static inline void blk_queue_free_zone_bitmaps(struct request_queue *q) {} struct block_device *disk_map_sector_rcu(struct gendisk *disk, sector_t sector); -int blk_alloc_devt(struct hd_struct *part, dev_t *devt); +int blk_alloc_devt(struct block_device *part, dev_t *devt); void blk_free_devt(dev_t devt); char *disk_name(struct gendisk *hd, int partno, char *buf); #define ADDPART_FLAG_NONE 0 diff --git a/block/genhd.c b/block/genhd.c index a85ffd7385718d..89cd0ba8e3b84a 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -559,8 +559,8 @@ static int blk_mangle_minor(int minor) } /** - * blk_alloc_devt - allocate a dev_t for a partition - * @part: partition to allocate dev_t for + * blk_alloc_devt - allocate a dev_t for a block device + * @bdev: block device to allocate dev_t for * @devt: out parameter for resulting dev_t * * Allocate a dev_t for block device. @@ -572,14 +572,14 @@ static int blk_mangle_minor(int minor) * CONTEXT: * Might sleep. */ -int blk_alloc_devt(struct hd_struct *part, dev_t *devt) +int blk_alloc_devt(struct block_device *bdev, dev_t *devt) { - struct gendisk *disk = part_to_disk(part); + struct gendisk *disk = bdev->bd_disk; int idx; /* in consecutive minor range? */ - if (part->bdev->bd_partno < disk->minors) { - *devt = MKDEV(disk->major, disk->first_minor + part->bdev->bd_partno); + if (bdev->bd_partno < disk->minors) { + *devt = MKDEV(disk->major, disk->first_minor + bdev->bd_partno); return 0; } @@ -735,7 +735,7 @@ static void __device_add_disk(struct device *parent, struct gendisk *disk, disk->flags |= GENHD_FL_UP; - retval = blk_alloc_devt(disk->part0->bd_part, &devt); + retval = blk_alloc_devt(disk->part0, &devt); if (retval) { WARN_ON(1); return; diff --git a/block/partitions/core.c b/block/partitions/core.c index ecc3228a086956..4f823c4c733518 100644 --- a/block/partitions/core.c +++ b/block/partitions/core.c @@ -392,7 +392,7 @@ static struct hd_struct *add_partition(struct gendisk *disk, int partno, pdev->type = &part_type; pdev->parent = ddev; - err = blk_alloc_devt(p, &devt); + err = blk_alloc_devt(bdev, &devt); if (err) goto out_bdput; pdev->devt = devt; From patchwork Thu Nov 26 13:04:18 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11933579 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1A829C63777 for ; Thu, 26 Nov 2020 13:07:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CAC47221F1 for ; Thu, 26 Nov 2020 13:07:46 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="E7cmj+ad" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390036AbgKZNHp (ORCPT ); Thu, 26 Nov 2020 08:07:45 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53212 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390026AbgKZNHl (ORCPT ); Thu, 26 Nov 2020 08:07:41 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C2947C0613D4; Thu, 26 Nov 2020 05:07:40 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=Or9n44gA396OJLT8EEZLiQKS7/tv37Y03iSNpZhQnrs=; b=E7cmj+adi6Gs4NLjJjQlTWmBz8 UC24t7cF1SHXmezfannkht9zSOKEW7WmMA8h3i2u6iGn3T8b2Hl5pTOWWBS1g/t+vUyVsFq155ThO Shrl3bMtt02TcdHBDXGtxBCkjf3eZX+aQt9MvPfSWI3gt6BVbCnb2wBS+Hva/tQqHCJIdftFPRU3X XYrdOHvpjaaFtFSB20obXJMIznxmVJreYe1Nd6mVa+4XgP+SiaKB2qKB0gEWPLE40M9JtEVnaSbYX CHNGKySOT8iuktACMNyRymDkUCWzSP+6kon5pMxfUzKZOr9zE3ib3FyzSMjzp9v9929XCo9QyGGby u6mgVKQw==; Received: from [2001:4bb8:18c:1dd6:27b8:b8a1:c13e:ceb1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGzj-0004BW-RG; Thu, 26 Nov 2020 13:07:32 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , dm-devel@redhat.com, Jan Kara , linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 40/44] block: pass a block_device to invalidate_partition Date: Thu, 26 Nov 2020 14:04:18 +0100 Message-Id: <20201126130422.92945-41-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201126130422.92945-1-hch@lst.de> References: <20201126130422.92945-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Pass the block_device actually needed instead of looking it up using bdget_disk. Signed-off-by: Christoph Hellwig Reviewed-by: Jan Kara --- block/genhd.c | 13 +++---------- 1 file changed, 3 insertions(+), 10 deletions(-) diff --git a/block/genhd.c b/block/genhd.c index 89cd0ba8e3b84a..28299b24173be1 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -792,14 +792,8 @@ void device_add_disk_no_queue_reg(struct device *parent, struct gendisk *disk) } EXPORT_SYMBOL(device_add_disk_no_queue_reg); -static void invalidate_partition(struct gendisk *disk, int partno) +static void invalidate_partition(struct block_device *bdev) { - struct block_device *bdev; - - bdev = bdget_disk(disk, partno); - if (!bdev) - return; - fsync_bdev(bdev); __invalidate_device(bdev, true); @@ -808,7 +802,6 @@ static void invalidate_partition(struct gendisk *disk, int partno) * up any more even if openers still hold references to it. */ remove_inode_hash(bdev->bd_inode); - bdput(bdev); } /** @@ -853,12 +846,12 @@ void del_gendisk(struct gendisk *disk) disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY | DISK_PITER_REVERSE); while ((part = disk_part_iter_next(&piter))) { - invalidate_partition(disk, part->bdev->bd_partno); + invalidate_partition(part->bdev); delete_partition(part); } disk_part_iter_exit(&piter); - invalidate_partition(disk, 0); + invalidate_partition(disk->part0); set_capacity(disk, 0); disk->flags &= ~GENHD_FL_UP; up_write(&bdev_lookup_sem); From patchwork Thu Nov 26 13:04:19 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11933569 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CDD6EC8301F for ; Thu, 26 Nov 2020 13:07:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8B6DB21D7E for ; Thu, 26 Nov 2020 13:07:54 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="Fve2TCgF" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390046AbgKZNHs (ORCPT ); Thu, 26 Nov 2020 08:07:48 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53226 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390035AbgKZNHp (ORCPT ); Thu, 26 Nov 2020 08:07:45 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1A58CC0613D4; Thu, 26 Nov 2020 05:07:45 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=bhLroHUgJS1VjAkjl015Q2Y6Zvo2/Xsv0rdcdo2cPs0=; b=Fve2TCgFSpUMESzYzVYUwCQiN4 DWHyEIyUDZ3N6CWmCpCEUvcd6b1wDb7eKF7CD+Zilrh0uzuWiSD4zpZCFczh5eJV3WHOZ+45SaHDa GFE5HFLSYSy3ln9XwYNbcgm5ZKXlR9kwvk0HXJ8v7KZY+Y+cZHYWelip0pJLZbR/t73cfbaJp10aL 5vxYD80dV6EsvnoNx20wmpln62wRQ3eLDlFJi/S3mqxRJVvLHNWac5FzmHiiHlbqV5yrntCL+t0JN XnpnF9MDQFg7TolmEqFKZ5LVhqPfUznU6ChBPVwtfiEvE9bhVu8ljMb7B0xDQmcq0L1bqCedhFHkM iXtzpqlw==; Received: from [2001:4bb8:18c:1dd6:27b8:b8a1:c13e:ceb1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGzl-0004C8-3U; Thu, 26 Nov 2020 13:07:33 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , dm-devel@redhat.com, Jan Kara , linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 41/44] block: switch disk_part_iter_* to use a struct block_device Date: Thu, 26 Nov 2020 14:04:19 +0100 Message-Id: <20201126130422.92945-42-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201126130422.92945-1-hch@lst.de> References: <20201126130422.92945-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Switch the partition iter infrastructure to iterate over block_device references instead of hd_struct ones mostly used to get at the block_device. Signed-off-by: Christoph Hellwig --- block/genhd.c | 57 +++++++++++++++++++-------------------- block/partitions/core.c | 13 +++++---- drivers/s390/block/dasd.c | 8 +++--- include/linux/genhd.h | 4 +-- 4 files changed, 40 insertions(+), 42 deletions(-) diff --git a/block/genhd.c b/block/genhd.c index 28299b24173be1..b58595f2ca33b1 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -233,7 +233,7 @@ EXPORT_SYMBOL_GPL(disk_part_iter_init); * CONTEXT: * Don't care. */ -struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter) +struct block_device *disk_part_iter_next(struct disk_part_iter *piter) { struct disk_part_tbl *ptbl; int inc, end; @@ -271,8 +271,7 @@ struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter) piter->idx == 0)) continue; - get_device(part_to_dev(part->bd_part)); - piter->part = part->bd_part; + piter->part = bdgrab(part); piter->idx += inc; break; } @@ -294,7 +293,8 @@ EXPORT_SYMBOL_GPL(disk_part_iter_next); */ void disk_part_iter_exit(struct disk_part_iter *piter) { - disk_put_part(piter->part); + if (piter->part) + bdput(piter->part); piter->part = NULL; } EXPORT_SYMBOL_GPL(disk_part_iter_exit); @@ -335,7 +335,6 @@ struct block_device *disk_map_sector_rcu(struct gendisk *disk, sector_t sector) for (i = 1; i < ptbl->len; i++) { part = rcu_dereference(ptbl->part[i]); - if (part && sector_in_part(part, sector)) { rcu_assign_pointer(ptbl->last_lookup, part); goto out_unlock; @@ -636,7 +635,7 @@ static void register_disk(struct device *parent, struct gendisk *disk, { struct device *ddev = disk_to_dev(disk); struct disk_part_iter piter; - struct hd_struct *part; + struct block_device *part; int err; ddev->parent = parent; @@ -686,7 +685,7 @@ static void register_disk(struct device *parent, struct gendisk *disk, /* announce possible partitions */ disk_part_iter_init(&piter, disk, 0); while ((part = disk_part_iter_next(&piter))) - kobject_uevent(&part_to_dev(part)->kobj, KOBJ_ADD); + kobject_uevent(bdev_kobj(part), KOBJ_ADD); disk_part_iter_exit(&piter); if (disk->queue->backing_dev_info->dev) { @@ -826,7 +825,7 @@ static void invalidate_partition(struct block_device *bdev) void del_gendisk(struct gendisk *disk) { struct disk_part_iter piter; - struct hd_struct *part; + struct block_device *part; might_sleep(); @@ -846,8 +845,8 @@ void del_gendisk(struct gendisk *disk) disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY | DISK_PITER_REVERSE); while ((part = disk_part_iter_next(&piter))) { - invalidate_partition(part->bdev); - delete_partition(part); + invalidate_partition(part); + delete_partition(part->bd_part); } disk_part_iter_exit(&piter); @@ -966,7 +965,7 @@ void __init printk_all_partitions(void) while ((dev = class_dev_iter_next(&iter))) { struct gendisk *disk = dev_to_disk(dev); struct disk_part_iter piter; - struct hd_struct *part; + struct block_device *part; char name_buf[BDEVNAME_SIZE]; char devt_buf[BDEVT_SIZE]; @@ -985,14 +984,14 @@ void __init printk_all_partitions(void) */ disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); while ((part = disk_part_iter_next(&piter))) { - bool is_part0 = part == disk->part0->bd_part; + bool is_part0 = part == disk->part0; printk("%s%s %10llu %s %s", is_part0 ? "" : " ", - bdevt_str(part_devt(part), devt_buf), - bdev_nr_sectors(part->bdev) >> 1, - disk_name(disk, part->bdev->bd_partno, name_buf), - part->bdev->bd_meta_info ? - part->bdev->bd_meta_info->uuid : ""); + bdevt_str(part->bd_dev, devt_buf), + bdev_nr_sectors(part) >> 1, + disk_name(disk, part->bd_partno, name_buf), + part->bd_meta_info ? + part->bd_meta_info->uuid : ""); if (is_part0) { if (dev->parent && dev->parent->driver) printk(" driver: %s\n", @@ -1068,7 +1067,7 @@ static int show_partition(struct seq_file *seqf, void *v) { struct gendisk *sgp = v; struct disk_part_iter piter; - struct hd_struct *part; + struct block_device *part; char buf[BDEVNAME_SIZE]; /* Don't show non-partitionable removeable devices or empty devices */ @@ -1082,9 +1081,9 @@ static int show_partition(struct seq_file *seqf, void *v) disk_part_iter_init(&piter, sgp, DISK_PITER_INCL_PART0); while ((part = disk_part_iter_next(&piter))) seq_printf(seqf, "%4d %7d %10llu %s\n", - MAJOR(part_devt(part)), MINOR(part_devt(part)), - bdev_nr_sectors(part->bdev) >> 1, - disk_name(sgp, part->bdev->bd_partno, buf)); + MAJOR(part->bd_dev), MINOR(part->bd_dev), + bdev_nr_sectors(part) >> 1, + disk_name(sgp, part->bd_partno, buf)); disk_part_iter_exit(&piter); return 0; @@ -1478,7 +1477,7 @@ static int diskstats_show(struct seq_file *seqf, void *v) { struct gendisk *gp = v; struct disk_part_iter piter; - struct hd_struct *hd; + struct block_device *hd; char buf[BDEVNAME_SIZE]; unsigned int inflight; struct disk_stats stat; @@ -1493,11 +1492,11 @@ static int diskstats_show(struct seq_file *seqf, void *v) disk_part_iter_init(&piter, gp, DISK_PITER_INCL_EMPTY_PART0); while ((hd = disk_part_iter_next(&piter))) { - part_stat_read_all(hd, &stat); + part_stat_read_all(hd->bd_part, &stat); if (queue_is_mq(gp->queue)) - inflight = blk_mq_in_flight(gp->queue, hd->bdev); + inflight = blk_mq_in_flight(gp->queue, hd); else - inflight = part_in_flight(hd->bdev); + inflight = part_in_flight(hd); seq_printf(seqf, "%4d %7d %s " "%lu %lu %lu %u " @@ -1506,8 +1505,8 @@ static int diskstats_show(struct seq_file *seqf, void *v) "%lu %lu %lu %u " "%lu %u" "\n", - MAJOR(part_devt(hd)), MINOR(part_devt(hd)), - disk_name(gp, hd->bdev->bd_partno, buf), + MAJOR(hd->bd_dev), MINOR(hd->bd_dev), + disk_name(gp, hd->bd_partno, buf), stat.ios[STAT_READ], stat.merges[STAT_READ], stat.sectors[STAT_READ], @@ -1662,7 +1661,7 @@ static void set_disk_ro_uevent(struct gendisk *gd, int ro) void set_disk_ro(struct gendisk *disk, int flag) { struct disk_part_iter piter; - struct hd_struct *part; + struct block_device *part; if (disk->part0->bd_read_only != flag) { set_disk_ro_uevent(disk, flag); @@ -1671,7 +1670,7 @@ void set_disk_ro(struct gendisk *disk, int flag) disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY); while ((part = disk_part_iter_next(&piter))) - part->bdev->bd_read_only = flag; + part->bd_read_only = flag; disk_part_iter_exit(&piter); } diff --git a/block/partitions/core.c b/block/partitions/core.c index 4f823c4c733518..6cccb2f38adb24 100644 --- a/block/partitions/core.c +++ b/block/partitions/core.c @@ -439,15 +439,14 @@ static bool partition_overlaps(struct gendisk *disk, sector_t start, sector_t length, int skip_partno) { struct disk_part_iter piter; - struct hd_struct *part; + struct block_device *part; bool overlap = false; disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY); while ((part = disk_part_iter_next(&piter))) { - if (part->bdev->bd_partno == skip_partno || - start >= part->bdev->bd_start_sect + - bdev_nr_sectors(part->bdev) || - start + length <= part->bdev->bd_start_sect) + if (part->bd_partno == skip_partno || + start >= part->bd_start_sect + bdev_nr_sectors(part) || + start + length <= part->bd_start_sect) continue; overlap = true; break; @@ -568,7 +567,7 @@ static bool disk_unlock_native_capacity(struct gendisk *disk) int blk_drop_partitions(struct block_device *bdev) { struct disk_part_iter piter; - struct hd_struct *part; + struct block_device *part; if (bdev->bd_part_count) return -EBUSY; @@ -578,7 +577,7 @@ int blk_drop_partitions(struct block_device *bdev) disk_part_iter_init(&piter, bdev->bd_disk, DISK_PITER_INCL_EMPTY); while ((part = disk_part_iter_next(&piter))) - delete_partition(part); + delete_partition(part->bd_part); disk_part_iter_exit(&piter); return 0; diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c index db24e04ee9781e..1825fa8d05a780 100644 --- a/drivers/s390/block/dasd.c +++ b/drivers/s390/block/dasd.c @@ -432,7 +432,7 @@ dasd_state_ready_to_online(struct dasd_device * device) { struct gendisk *disk; struct disk_part_iter piter; - struct hd_struct *part; + struct block_device *part; device->state = DASD_STATE_ONLINE; if (device->block) { @@ -445,7 +445,7 @@ dasd_state_ready_to_online(struct dasd_device * device) disk = device->block->bdev->bd_disk; disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); while ((part = disk_part_iter_next(&piter))) - kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE); + kobject_uevent(bdev_kobj(part), KOBJ_CHANGE); disk_part_iter_exit(&piter); } return 0; @@ -459,7 +459,7 @@ static int dasd_state_online_to_ready(struct dasd_device *device) int rc; struct gendisk *disk; struct disk_part_iter piter; - struct hd_struct *part; + struct block_device *part; if (device->discipline->online_to_ready) { rc = device->discipline->online_to_ready(device); @@ -472,7 +472,7 @@ static int dasd_state_online_to_ready(struct dasd_device *device) disk = device->block->bdev->bd_disk; disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); while ((part = disk_part_iter_next(&piter))) - kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE); + kobject_uevent(bdev_kobj(part), KOBJ_CHANGE); disk_part_iter_exit(&piter); } return 0; diff --git a/include/linux/genhd.h b/include/linux/genhd.h index 3c13d4708e3f9d..cd23c80265b2b2 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -244,14 +244,14 @@ static inline void disk_put_part(struct hd_struct *part) struct disk_part_iter { struct gendisk *disk; - struct hd_struct *part; + struct block_device *part; int idx; unsigned int flags; }; extern void disk_part_iter_init(struct disk_part_iter *piter, struct gendisk *disk, unsigned int flags); -extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter); +struct block_device *disk_part_iter_next(struct disk_part_iter *piter); extern void disk_part_iter_exit(struct disk_part_iter *piter); extern bool disk_has_partitions(struct gendisk *disk); From patchwork Thu Nov 26 13:04:20 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11933553 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EE9B9C83029 for ; 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bh=3s9ZV7/S/AMqijy+96nJeQSoiw9kLp/J9AYboOAYnhs=; b=lbuMqndrB4unGfBY2q8G5+moxM EuvFsvmmVuvx5mPiC+nnsGzQIcFdzQZi6ZsjodsHPBp7chjmprxWF707wat01mujb4rRcWkYVzfvJ xkcBoyNStiLpMrLVijQtl3GaDDdfzaLRmIQ4oVKAYpKq0DaqJcQ5JC+WwUL/Mgcst3eINsPBfyGRO c36pao99EtbARVjFs15yxmbrCl+aO/l1YeA9iQ7erqMEAllqKRsfSw0I8L0TUSp7OZzJ7+sx9bfcl WMhzpiY6mnI4jLPyIiCgWrzFmAUSNPMcmi1/TUxKLQ0+Bb42oiUEu3V3u861W9swvmCZiLxDAucig OsvEoqAg==; Received: from [2001:4bb8:18c:1dd6:27b8:b8a1:c13e:ceb1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGzm-0004Ci-Ls; Thu, 26 Nov 2020 13:07:35 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , dm-devel@redhat.com, Jan Kara , linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, Chao Yu Subject: [PATCH 42/44] f2fs: remove a few bd_part checks Date: Thu, 26 Nov 2020 14:04:20 +0100 Message-Id: <20201126130422.92945-43-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201126130422.92945-1-hch@lst.de> References: <20201126130422.92945-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org bd_part is never NULL for a block device in use by a file system, so remove the checks. Signed-off-by: Christoph Hellwig Reviewed-by: Chao Yu --- fs/f2fs/checkpoint.c | 5 +---- fs/f2fs/sysfs.c | 9 --------- 2 files changed, 1 insertion(+), 13 deletions(-) diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c index 023462e80e58d5..54a1905af052cc 100644 --- a/fs/f2fs/checkpoint.c +++ b/fs/f2fs/checkpoint.c @@ -1395,7 +1395,6 @@ static int do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc) __u32 crc32 = 0; int i; int cp_payload_blks = __cp_payload(sbi); - struct super_block *sb = sbi->sb; struct curseg_info *seg_i = CURSEG_I(sbi, CURSEG_HOT_NODE); u64 kbytes_written; int err; @@ -1489,9 +1488,7 @@ static int do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc) start_blk += data_sum_blocks; /* Record write statistics in the hot node summary */ - kbytes_written = sbi->kbytes_written; - if (sb->s_bdev->bd_part) - kbytes_written += BD_PART_WRITTEN(sbi); + kbytes_written = sbi->kbytes_written + BD_PART_WRITTEN(sbi); seg_i->journal->info.kbytes_written = cpu_to_le64(kbytes_written); diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c index ec77ccfea923dc..24e876e849c512 100644 --- a/fs/f2fs/sysfs.c +++ b/fs/f2fs/sysfs.c @@ -90,11 +90,6 @@ static ssize_t free_segments_show(struct f2fs_attr *a, static ssize_t lifetime_write_kbytes_show(struct f2fs_attr *a, struct f2fs_sb_info *sbi, char *buf) { - struct super_block *sb = sbi->sb; - - if (!sb->s_bdev->bd_part) - return sprintf(buf, "0\n"); - return sprintf(buf, "%llu\n", (unsigned long long)(sbi->kbytes_written + BD_PART_WRITTEN(sbi))); @@ -103,12 +98,8 @@ static ssize_t lifetime_write_kbytes_show(struct f2fs_attr *a, static ssize_t features_show(struct f2fs_attr *a, struct f2fs_sb_info *sbi, char *buf) { - struct super_block *sb = sbi->sb; int len = 0; - if (!sb->s_bdev->bd_part) - return sprintf(buf, "0\n"); - if (f2fs_sb_has_encrypt(sbi)) len += scnprintf(buf, PAGE_SIZE - len, "%s", "encryption"); From patchwork Thu Nov 26 13:04:21 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11933577 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 66F75C83014 for ; 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bh=CHJyFK5DnT0y5BHAvruGFTzdOzqciOqUVZYK0Q81OEM=; b=rYGFUhb/A4nrRcKK5PuIYkqMN9 5/ennd+yS+0VTGPuX009YpOTVW73H9ABbes8TDaCP+B5OcNy6pIhL87biJ2oC7ICR2MwdXevuC6lX 7MA/z/Jb918bvRMRxpcHM6OentFjKFP0mNCITNDnDd5mhjqXz6mbLD6iTjLKcsKcfqaK2rVb0b+UZ 9YMA2TZYfVlCOXuOgNY4RRF8iwWp5nJ+p9iRhv2N5AQcgS1+2mj+2XOL7Crl6J49u6vebdzt8MJTy vt6aTGhZk1SNG5qgfilM7zz012gvbdVXDcZ8mBbE7Ymb2N34koglEJ804+myht401l9dyy4AusLHG t4DmchIg==; Received: from [2001:4bb8:18c:1dd6:27b8:b8a1:c13e:ceb1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGzo-0004DU-9d; Thu, 26 Nov 2020 13:07:37 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , dm-devel@redhat.com, Jan Kara , linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 43/44] block: merge struct block_device and struct hd_struct Date: Thu, 26 Nov 2020 14:04:21 +0100 Message-Id: <20201126130422.92945-44-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201126130422.92945-1-hch@lst.de> References: <20201126130422.92945-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Instead of having two structures that represent each block device with different life time rules, merge them into a single one. This also greatly simplifies the reference counting rules, as we can use the inode reference count as the main reference count for the new struct block_device, with the device model reference front ending it for device model interaction. The percpu refcount in struct hd_struct is entirely gone given that struct block_device must be opened and thus valid for the duration of the I/O. Signed-off-by: Christoph Hellwig --- block/blk-cgroup.c | 9 ++- block/blk.h | 2 +- block/genhd.c | 86 +++++++++------------------- block/partitions/core.c | 116 +++++++++++++++----------------------- fs/block_dev.c | 9 --- include/linux/blk_types.h | 8 ++- include/linux/blkdev.h | 1 - include/linux/genhd.h | 40 +++---------- init/do_mounts.c | 21 ++++--- kernel/trace/blktrace.c | 43 +++----------- 10 files changed, 108 insertions(+), 227 deletions(-) diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c index 5c0a9d588e6312..031114d454a604 100644 --- a/block/blk-cgroup.c +++ b/block/blk-cgroup.c @@ -820,9 +820,9 @@ static void blkcg_fill_root_iostats(void) class_dev_iter_init(&iter, &block_class, NULL, &disk_type); while ((dev = class_dev_iter_next(&iter))) { - struct gendisk *disk = dev_to_disk(dev); - struct hd_struct *part = disk_get_part(disk, 0); - struct blkcg_gq *blkg = blk_queue_root_blkg(disk->queue); + struct block_device *bdev = dev_to_bdev(dev); + struct blkcg_gq *blkg = + blk_queue_root_blkg(bdev->bd_disk->queue); struct blkg_iostat tmp; int cpu; @@ -830,7 +830,7 @@ static void blkcg_fill_root_iostats(void) for_each_possible_cpu(cpu) { struct disk_stats *cpu_dkstats; - cpu_dkstats = per_cpu_ptr(part->bdev->bd_stats, cpu); + cpu_dkstats = per_cpu_ptr(bdev->bd_stats, cpu); tmp.ios[BLKG_IOSTAT_READ] += cpu_dkstats->ios[STAT_READ]; tmp.ios[BLKG_IOSTAT_WRITE] += @@ -849,7 +849,6 @@ static void blkcg_fill_root_iostats(void) blkg_iostat_set(&blkg->iostat.cur, &tmp); u64_stats_update_end(&blkg->iostat.sync); } - disk_put_part(part); } } diff --git a/block/blk.h b/block/blk.h index 9657c6da7c770c..98f0b1ae264120 100644 --- a/block/blk.h +++ b/block/blk.h @@ -356,7 +356,7 @@ char *disk_name(struct gendisk *hd, int partno, char *buf); #define ADDPART_FLAG_NONE 0 #define ADDPART_FLAG_RAID 1 #define ADDPART_FLAG_WHOLEDISK 2 -void delete_partition(struct hd_struct *part); +void delete_partition(struct block_device *part); int bdev_add_partition(struct block_device *bdev, int partno, sector_t start, sector_t length); int bdev_del_partition(struct block_device *bdev, int partno); diff --git a/block/genhd.c b/block/genhd.c index b58595f2ca33b1..af76c2fff40d31 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -98,13 +98,14 @@ const char *bdevname(struct block_device *bdev, char *buf) } EXPORT_SYMBOL(bdevname); -static void part_stat_read_all(struct hd_struct *part, struct disk_stats *stat) +static void part_stat_read_all(struct block_device *part, + struct disk_stats *stat) { int cpu; memset(stat, 0, sizeof(struct disk_stats)); for_each_possible_cpu(cpu) { - struct disk_stats *ptr = per_cpu_ptr(part->bdev->bd_stats, cpu); + struct disk_stats *ptr = per_cpu_ptr(part->bd_stats, cpu); int group; for (group = 0; group < NR_STAT_GROUPS; group++) { @@ -159,36 +160,6 @@ struct block_device *__disk_get_part(struct gendisk *disk, int partno) return rcu_dereference(ptbl->part[partno]); } -/** - * disk_get_part - get partition - * @disk: disk to look partition from - * @partno: partition number - * - * Look for partition @partno from @disk. If found, increment - * reference count and return it. - * - * CONTEXT: - * Don't care. - * - * RETURNS: - * Pointer to the found partition on success, NULL if not found. - */ -struct hd_struct *disk_get_part(struct gendisk *disk, int partno) -{ - struct block_device *part; - - rcu_read_lock(); - part = __disk_get_part(disk, partno); - if (!part) { - rcu_read_unlock(); - return NULL; - } - - get_device(part_to_dev(part->bd_part)); - rcu_read_unlock(); - return part->bd_part; -} - /** * disk_part_iter_init - initialize partition iterator * @piter: iterator to initialize @@ -846,7 +817,7 @@ void del_gendisk(struct gendisk *disk) DISK_PITER_INCL_EMPTY | DISK_PITER_REVERSE); while ((part = disk_part_iter_next(&piter))) { invalidate_partition(part); - delete_partition(part->bd_part); + delete_partition(part); } disk_part_iter_exit(&piter); @@ -939,13 +910,13 @@ void blk_request_module(dev_t devt) */ struct block_device *bdget_disk(struct gendisk *disk, int partno) { - struct hd_struct *part; struct block_device *bdev = NULL; - part = disk_get_part(disk, partno); - if (part) - bdev = bdget_part(part); - disk_put_part(part); + rcu_read_lock(); + bdev = __disk_get_part(disk, partno); + if (bdev) + bdgrab(bdev); + rcu_read_unlock(); return bdev; } @@ -1162,24 +1133,22 @@ static ssize_t disk_ro_show(struct device *dev, ssize_t part_size_show(struct device *dev, struct device_attribute *attr, char *buf) { - struct hd_struct *p = dev_to_part(dev); - - return sprintf(buf, "%llu\n", bdev_nr_sectors(p->bdev)); + return sprintf(buf, "%llu\n", bdev_nr_sectors(dev_to_bdev(dev))); } ssize_t part_stat_show(struct device *dev, struct device_attribute *attr, char *buf) { - struct hd_struct *p = dev_to_part(dev); - struct request_queue *q = part_to_disk(p)->queue; + struct block_device *bdev = dev_to_bdev(dev); + struct request_queue *q = bdev->bd_disk->queue; struct disk_stats stat; unsigned int inflight; - part_stat_read_all(p, &stat); + part_stat_read_all(bdev, &stat); if (queue_is_mq(q)) - inflight = blk_mq_in_flight(q, p->bdev); + inflight = blk_mq_in_flight(q, bdev); else - inflight = part_in_flight(p->bdev); + inflight = part_in_flight(bdev); return sprintf(buf, "%8lu %8lu %8llu %8u " @@ -1214,14 +1183,14 @@ ssize_t part_stat_show(struct device *dev, ssize_t part_inflight_show(struct device *dev, struct device_attribute *attr, char *buf) { - struct hd_struct *p = dev_to_part(dev); - struct request_queue *q = part_to_disk(p)->queue; + struct block_device *bdev = dev_to_bdev(dev); + struct request_queue *q = bdev->bd_disk->queue; unsigned int inflight[2]; if (queue_is_mq(q)) - blk_mq_in_flight_rw(q, p->bdev, inflight); + blk_mq_in_flight_rw(q, bdev, inflight); else - part_in_flight_rw(p->bdev, inflight); + part_in_flight_rw(bdev, inflight); return sprintf(buf, "%8u %8u\n", inflight[0], inflight[1]); } @@ -1269,16 +1238,14 @@ static DEVICE_ATTR(badblocks, 0644, disk_badblocks_show, disk_badblocks_store); ssize_t part_fail_show(struct device *dev, struct device_attribute *attr, char *buf) { - struct hd_struct *p = dev_to_part(dev); - - return sprintf(buf, "%d\n", p->bdev->bd_make_it_fail); + return sprintf(buf, "%d\n", dev_to_bdev(dev)->make_it_fail); } ssize_t part_fail_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { - struct hd_struct *p = dev_to_part(dev); + struct block_device *p = dev_to_bdev(dev); int i; if (count > 0 && sscanf(buf, "%d", &i) > 0) @@ -1492,7 +1459,7 @@ static int diskstats_show(struct seq_file *seqf, void *v) disk_part_iter_init(&piter, gp, DISK_PITER_INCL_EMPTY_PART0); while ((hd = disk_part_iter_next(&piter))) { - part_stat_read_all(hd->bd_part, &stat); + part_stat_read_all(hd, &stat); if (queue_is_mq(gp->queue)) inflight = blk_mq_in_flight(gp->queue, hd); else @@ -1564,7 +1531,7 @@ dev_t blk_lookup_devt(const char *name, int partno) class_dev_iter_init(&iter, &block_class, NULL, &disk_type); while ((dev = class_dev_iter_next(&iter))) { struct gendisk *disk = dev_to_disk(dev); - struct hd_struct *part; + struct block_device *part; if (strcmp(dev_name(dev), name)) continue; @@ -1577,13 +1544,12 @@ dev_t blk_lookup_devt(const char *name, int partno) MINOR(dev->devt) + partno); break; } - part = disk_get_part(disk, partno); + part = bdget_disk(disk, partno); if (part) { - devt = part_devt(part); - disk_put_part(part); + devt = part->bd_dev; + bdput(part); break; } - disk_put_part(part); } class_dev_iter_exit(&iter); return devt; diff --git a/block/partitions/core.c b/block/partitions/core.c index 6cccb2f38adb24..deca253583bd3f 100644 --- a/block/partitions/core.c +++ b/block/partitions/core.c @@ -182,44 +182,39 @@ static struct parsed_partitions *check_partition(struct gendisk *hd, static ssize_t part_partition_show(struct device *dev, struct device_attribute *attr, char *buf) { - struct hd_struct *p = dev_to_part(dev); - - return sprintf(buf, "%d\n", p->bdev->bd_partno); + return sprintf(buf, "%d\n", dev_to_bdev(dev)->bd_partno); } static ssize_t part_start_show(struct device *dev, struct device_attribute *attr, char *buf) { - struct hd_struct *p = dev_to_part(dev); - - return sprintf(buf, "%llu\n",(unsigned long long)p->bdev->bd_start_sect); + return sprintf(buf, "%llu\n", dev_to_bdev(dev)->bd_start_sect); } static ssize_t part_ro_show(struct device *dev, struct device_attribute *attr, char *buf) { - struct hd_struct *p = dev_to_part(dev); - return sprintf(buf, "%d\n", p->bdev->bd_read_only); + return sprintf(buf, "%d\n", dev_to_bdev(dev)->bd_read_only); } static ssize_t part_alignment_offset_show(struct device *dev, struct device_attribute *attr, char *buf) { - struct hd_struct *p = dev_to_part(dev); + struct block_device *bdev = dev_to_bdev(dev); return sprintf(buf, "%u\n", - queue_limit_alignment_offset(&part_to_disk(p)->queue->limits, - p->bdev->bd_start_sect)); + queue_limit_alignment_offset(&bdev->bd_disk->queue->limits, + bdev->bd_start_sect)); } static ssize_t part_discard_alignment_show(struct device *dev, struct device_attribute *attr, char *buf) { - struct hd_struct *p = dev_to_part(dev); + struct block_device *bdev = dev_to_bdev(dev); return sprintf(buf, "%u\n", - queue_limit_discard_alignment(&part_to_disk(p)->queue->limits, - p->bdev->bd_start_sect)); + queue_limit_discard_alignment(&bdev->bd_disk->queue->limits, + bdev->bd_start_sect)); } static DEVICE_ATTR(partition, 0444, part_partition_show, NULL); @@ -264,20 +259,17 @@ static const struct attribute_group *part_attr_groups[] = { static void part_release(struct device *dev) { - struct hd_struct *p = dev_to_part(dev); - blk_free_devt(dev->devt); - bdput(p->bdev); + bdput(dev_to_bdev(dev)); } static int part_uevent(struct device *dev, struct kobj_uevent_env *env) { - struct hd_struct *part = dev_to_part(dev); + struct block_device *part = dev_to_bdev(dev); - add_uevent_var(env, "PARTN=%u", part->bdev->bd_partno); - if (part->bdev->bd_meta_info && part->bdev->bd_meta_info->volname[0]) - add_uevent_var(env, "PARTNAME=%s", - part->bdev->bd_meta_info->volname); + add_uevent_var(env, "PARTN=%u", part->bd_partno); + if (part->bd_meta_info && part->bd_meta_info->volname[0]) + add_uevent_var(env, "PARTNAME=%s", part->bd_meta_info->volname); return 0; } @@ -292,25 +284,25 @@ struct device_type part_type = { * Must be called either with bd_mutex held, before a disk can be opened or * after all disk users are gone. */ -void delete_partition(struct hd_struct *part) +void delete_partition(struct block_device *part) { - struct gendisk *disk = part_to_disk(part); + struct gendisk *disk = part->bd_disk; struct disk_part_tbl *ptbl = rcu_dereference_protected(disk->part_tbl, 1); - rcu_assign_pointer(ptbl->part[part->bdev->bd_partno], NULL); + rcu_assign_pointer(ptbl->part[part->bd_partno], NULL); rcu_assign_pointer(ptbl->last_lookup, NULL); - kobject_put(part->bdev->bd_holder_dir); - device_del(part_to_dev(part)); + kobject_put(part->bd_holder_dir); + device_del(&part->bd_device); /* * Remove the block device from the inode hash, so that it cannot be * looked up any more even when openers still hold references. */ - remove_inode_hash(part->bdev->bd_inode); + remove_inode_hash(part->bd_inode); - put_device(part_to_dev(part)); + put_device(&part->bd_device); } static ssize_t whole_disk_show(struct device *dev, @@ -324,11 +316,10 @@ static DEVICE_ATTR(whole_disk, 0444, whole_disk_show, NULL); * Must be called either with bd_mutex held, before a disk can be opened or * after all disk users are gone. */ -static struct hd_struct *add_partition(struct gendisk *disk, int partno, +static struct block_device *add_partition(struct gendisk *disk, int partno, sector_t start, sector_t len, int flags, struct partition_meta_info *info) { - struct hd_struct *p; dev_t devt = MKDEV(0, 0); struct device *ddev = disk_to_dev(disk); struct device *pdev; @@ -367,9 +358,6 @@ static struct hd_struct *add_partition(struct gendisk *disk, int partno, if (!bdev) return ERR_PTR(-ENOMEM); - p = bdev->bd_part; - pdev = part_to_dev(p); - bdev->bd_start_sect = start; bdev_set_nr_sectors(bdev, len); bdev->bd_read_only = get_disk_ro(disk); @@ -381,6 +369,7 @@ static struct hd_struct *add_partition(struct gendisk *disk, int partno, goto out_bdput; } + pdev = &bdev->bd_device; dname = dev_name(ddev); if (isdigit(dname[strlen(dname) - 1])) dev_set_name(pdev, "%sp%d", dname, partno); @@ -422,7 +411,7 @@ static struct hd_struct *add_partition(struct gendisk *disk, int partno, /* suppress uevent if the disk suppresses it */ if (!dev_get_uevent_suppress(ddev)) kobject_uevent(&pdev->kobj, KOBJ_ADD); - return p; + return bdev; out_bdput: bdput(bdev); @@ -459,7 +448,7 @@ static bool partition_overlaps(struct gendisk *disk, sector_t start, int bdev_add_partition(struct block_device *bdev, int partno, sector_t start, sector_t length) { - struct hd_struct *part; + struct block_device *part; mutex_lock(&bdev->bd_mutex); if (partition_overlaps(bdev->bd_disk, start, length, -1)) { @@ -475,76 +464,59 @@ int bdev_add_partition(struct block_device *bdev, int partno, int bdev_del_partition(struct block_device *bdev, int partno) { - struct block_device *bdevp; - struct hd_struct *part = NULL; + struct block_device *part; int ret; - bdevp = bdget_disk(bdev->bd_disk, partno); - if (!bdevp) + part = bdget_disk(bdev->bd_disk, partno); + if (!part) return -ENXIO; - mutex_lock(&bdevp->bd_mutex); + mutex_lock(&part->bd_mutex); mutex_lock_nested(&bdev->bd_mutex, 1); - ret = -ENXIO; - part = disk_get_part(bdev->bd_disk, partno); - if (!part) - goto out_unlock; - ret = -EBUSY; - if (bdevp->bd_openers) + if (part->bd_openers) goto out_unlock; - sync_blockdev(bdevp); - invalidate_bdev(bdevp); + sync_blockdev(part); + invalidate_bdev(part); delete_partition(part); ret = 0; out_unlock: mutex_unlock(&bdev->bd_mutex); - mutex_unlock(&bdevp->bd_mutex); - bdput(bdevp); - if (part) - disk_put_part(part); + mutex_unlock(&part->bd_mutex); + bdput(part); return ret; } int bdev_resize_partition(struct block_device *bdev, int partno, sector_t start, sector_t length) { - struct block_device *bdevp; - struct hd_struct *part; + struct block_device *part; int ret = 0; - part = disk_get_part(bdev->bd_disk, partno); + part = bdget_disk(bdev->bd_disk, partno); if (!part) return -ENXIO; - ret = -ENOMEM; - bdevp = bdget_part(part); - if (!bdevp) - goto out_put_part; - - mutex_lock(&bdevp->bd_mutex); + mutex_lock(&part->bd_mutex); mutex_lock_nested(&bdev->bd_mutex, 1); - ret = -EINVAL; - if (start != part->bdev->bd_start_sect) + if (start != part->bd_start_sect) goto out_unlock; ret = -EBUSY; if (partition_overlaps(bdev->bd_disk, start, length, partno)) goto out_unlock; - bdev_set_nr_sectors(bdevp, length); + bdev_set_nr_sectors(part, length); ret = 0; out_unlock: - mutex_unlock(&bdevp->bd_mutex); + mutex_unlock(&part->bd_mutex); mutex_unlock(&bdev->bd_mutex); - bdput(bdevp); -out_put_part: - disk_put_part(part); + bdput(part); return ret; } @@ -577,7 +549,7 @@ int blk_drop_partitions(struct block_device *bdev) disk_part_iter_init(&piter, bdev->bd_disk, DISK_PITER_INCL_EMPTY); while ((part = disk_part_iter_next(&piter))) - delete_partition(part->bd_part); + delete_partition(part); disk_part_iter_exit(&piter); return 0; @@ -592,7 +564,7 @@ static bool blk_add_partition(struct gendisk *disk, struct block_device *bdev, { sector_t size = state->parts[p].size; sector_t from = state->parts[p].from; - struct hd_struct *part; + struct block_device *part; if (!size) return true; @@ -632,7 +604,7 @@ static bool blk_add_partition(struct gendisk *disk, struct block_device *bdev, if (IS_BUILTIN(CONFIG_BLK_DEV_MD) && (state->parts[p].flags & ADDPART_FLAG_RAID)) - md_autodetect_dev(part_to_dev(part)->devt); + md_autodetect_dev(part->bd_dev); return true; } diff --git a/fs/block_dev.c b/fs/block_dev.c index a15d1c114a247e..58fd6625966511 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -39,7 +39,6 @@ struct bdev_inode { struct block_device bdev; - struct hd_struct hd; struct inode vfs_inode; }; @@ -887,9 +886,6 @@ struct block_device *bdev_alloc(struct gendisk *disk, u8 partno) iput(inode); return NULL; } - bdev->bd_part = &BDEV_I(inode)->hd; - memset(bdev->bd_part, 0, sizeof(*bdev->bd_part)); - bdev->bd_part->bdev = bdev; return bdev; } @@ -922,11 +918,6 @@ struct block_device *bdgrab(struct block_device *bdev) } EXPORT_SYMBOL(bdgrab); -struct block_device *bdget_part(struct hd_struct *part) -{ - return bdget(part_devt(part)); -} - long nr_blockdev_pages(void) { struct inode *inode; diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h index 6edea5c1625909..866f74261b3ba8 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -8,6 +8,7 @@ #include #include +#include #include struct bio_set; @@ -30,6 +31,7 @@ struct block_device { struct super_block * bd_super; struct mutex bd_mutex; /* open/close mutex */ void * bd_claiming; + struct device bd_device; void * bd_holder; int bd_holders; bool bd_write_holder; @@ -38,7 +40,6 @@ struct block_device { #endif struct kobject *bd_holder_dir; u8 bd_partno; - struct hd_struct * bd_part; /* number of times partitions within this device have been opened. */ unsigned bd_part_count; @@ -61,8 +62,11 @@ struct block_device { #define bdev_whole(_bdev) \ ((_bdev)->bd_disk->part0) +#define dev_to_bdev(device) \ + container_of((device), struct block_device, bd_device) + #define bdev_kobj(_bdev) \ - (&part_to_dev((_bdev)->bd_part)->kobj) + (&((_bdev)->bd_device.kobj)) /* * Block error status values. See block/blk-core:blk_errors for the details. diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 1d4be1fc6007c5..17cedf0dc83db0 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1999,7 +1999,6 @@ void blkdev_put_no_open(struct block_device *bdev); struct block_device *bdev_alloc(struct gendisk *disk, u8 partno); void bdev_add(struct block_device *bdev, dev_t dev); struct block_device *I_BDEV(struct inode *inode); -struct block_device *bdget_part(struct hd_struct *part); struct block_device *bdgrab(struct block_device *bdev); void bdput(struct block_device *); diff --git a/include/linux/genhd.h b/include/linux/genhd.h index cd23c80265b2b2..809aaa32d53cba 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -19,12 +19,6 @@ #include #include -#define dev_to_part(device) container_of((device), struct hd_struct, __dev) -#define part_to_dev(part) (&((part)->__dev)) - -#define dev_to_disk(device) (dev_to_part(device)->bdev->bd_disk) -#define disk_to_dev(disk) (part_to_dev((disk)->part0->bd_part)) - extern const struct device_type disk_type; extern struct device_type part_type; extern struct class block_class; @@ -51,11 +45,6 @@ struct partition_meta_info { u8 volname[PARTITION_META_INFO_VOLNAMELTH]; }; -struct hd_struct { - struct block_device *bdev; - struct device __dev; -}; - /** * DOC: genhd capability flags * @@ -190,19 +179,21 @@ struct gendisk { struct lockdep_map lockdep_map; }; +/* + * The gendisk is refcounted by the part0 block_device, and the bd_device + * therein is also used for device model presentation in sysfs. + */ +#define dev_to_disk(device) \ + (dev_to_bdev(device)->bd_disk) +#define disk_to_dev(disk) \ + (&((disk)->part0->bd_device)) + #if IS_REACHABLE(CONFIG_CDROM) #define disk_to_cdi(disk) ((disk)->cdi) #else #define disk_to_cdi(disk) NULL #endif -static inline struct gendisk *part_to_disk(struct hd_struct *part) -{ - if (unlikely(!part)) - return NULL; - return part->bdev->bd_disk; -} - static inline int disk_max_parts(struct gendisk *disk) { if (disk->flags & GENHD_FL_EXT_DEVT) @@ -221,19 +212,6 @@ static inline dev_t disk_devt(struct gendisk *disk) return MKDEV(disk->major, disk->first_minor); } -static inline dev_t part_devt(struct hd_struct *part) -{ - return part_to_dev(part)->devt; -} - -extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno); - -static inline void disk_put_part(struct hd_struct *part) -{ - if (likely(part)) - put_device(part_to_dev(part)); -} - /* * Smarter partition iterator without context limits. */ diff --git a/init/do_mounts.c b/init/do_mounts.c index 86bef93e72ebd6..a78e44ee6adb8d 100644 --- a/init/do_mounts.c +++ b/init/do_mounts.c @@ -76,11 +76,11 @@ struct uuidcmp { */ static int match_dev_by_uuid(struct device *dev, const void *data) { + struct block_device *bdev = dev_to_bdev(dev); const struct uuidcmp *cmp = data; - struct hd_struct *part = dev_to_part(dev); - if (!part->bdev->bd_meta_info || - strncasecmp(cmp->uuid, part->bdev->bd_meta_info->uuid, cmp->len)) + if (!bdev->bd_meta_info || + strncasecmp(cmp->uuid, bdev->bd_meta_info->uuid, cmp->len)) return 0; return 1; } @@ -133,13 +133,13 @@ static dev_t devt_from_partuuid(const char *uuid_str) * Attempt to find the requested partition by adding an offset * to the partition number found by UUID. */ - struct hd_struct *part; + struct block_device *part; - part = disk_get_part(dev_to_disk(dev), - dev_to_part(dev)->bdev->bd_partno + offset); + part = bdget_disk(dev_to_disk(dev), + dev_to_bdev(dev)->bd_partno + offset); if (part) { - devt = part_devt(part); - put_device(part_to_dev(part)); + devt = part->bd_dev; + bdput(part); } } else { devt = dev->devt; @@ -166,11 +166,10 @@ static dev_t devt_from_partuuid(const char *uuid_str) */ static int match_dev_by_label(struct device *dev, const void *data) { + struct block_device *bdev = dev_to_bdev(dev); const char *label = data; - struct hd_struct *part = dev_to_part(dev); - if (!part->bdev->bd_meta_info || - strcmp(label, part->bdev->bd_meta_info->volname)) + if (!bdev->bd_meta_info || strcmp(label, bdev->bd_meta_info->volname)) return 0; return 1; } diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c index 8a723a91ec5a06..a482a37848bff7 100644 --- a/kernel/trace/blktrace.c +++ b/kernel/trace/blktrace.c @@ -1810,30 +1810,15 @@ static ssize_t blk_trace_mask2str(char *buf, int mask) return p - buf; } -static struct request_queue *blk_trace_get_queue(struct block_device *bdev) -{ - if (bdev->bd_disk == NULL) - return NULL; - - return bdev_get_queue(bdev); -} - static ssize_t sysfs_blk_trace_attr_show(struct device *dev, struct device_attribute *attr, char *buf) { - struct block_device *bdev = bdget_part(dev_to_part(dev)); - struct request_queue *q; + struct block_device *bdev = dev_to_bdev(dev); + struct request_queue *q = bdev_get_queue(bdev); struct blk_trace *bt; ssize_t ret = -ENXIO; - if (bdev == NULL) - goto out; - - q = blk_trace_get_queue(bdev); - if (q == NULL) - goto out_bdput; - mutex_lock(&q->debugfs_mutex); bt = rcu_dereference_protected(q->blk_trace, @@ -1856,9 +1841,6 @@ static ssize_t sysfs_blk_trace_attr_show(struct device *dev, out_unlock_bdev: mutex_unlock(&q->debugfs_mutex); -out_bdput: - bdput(bdev); -out: return ret; } @@ -1866,8 +1848,8 @@ static ssize_t sysfs_blk_trace_attr_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { - struct block_device *bdev; - struct request_queue *q; + struct block_device *bdev = dev_to_bdev(dev); + struct request_queue *q = bdev_get_queue(bdev); struct blk_trace *bt; u64 value; ssize_t ret = -EINVAL; @@ -1883,17 +1865,10 @@ static ssize_t sysfs_blk_trace_attr_store(struct device *dev, goto out; value = ret; } - } else if (kstrtoull(buf, 0, &value)) - goto out; - - ret = -ENXIO; - bdev = bdget_part(dev_to_part(dev)); - if (bdev == NULL) - goto out; - - q = blk_trace_get_queue(bdev); - if (q == NULL) - goto out_bdput; + } else { + if (kstrtoull(buf, 0, &value)) + goto out; + } mutex_lock(&q->debugfs_mutex); @@ -1931,8 +1906,6 @@ static ssize_t sysfs_blk_trace_attr_store(struct device *dev, out_unlock_bdev: mutex_unlock(&q->debugfs_mutex); -out_bdput: - bdput(bdev); out: return ret ? ret : count; } From patchwork Thu Nov 26 13:04:22 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11933565 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DD878C8300B for ; 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bh=BQcek4m3yWABZ+dx/WiWy+1fJw3es+Bc+lvaZ4inu9c=; b=ObNpBS6e3dv1B+pEgGrY5Ta9DN Q3qYUXZyTruHkEGafQUJ1CalZAd5EtsTd7ybHljioFm8OxKdkAQ8f8uSHN3n1GRp9F2+AORR9L9fr QQLST7btmRc45KSAQf0X9/kQkAbiWsefqO2U7rFUzLI/g1nf3xU2IvbjuDOMaCWytE/K/XeEYBlJm z599ZkH4fXMPwG+mC9a5t0bVJy9MopskGhs7CbNpx5XACAX7Tv4sqYyE8vwz9ObAA+c0d1mcZvPGm d3bVigMlXA1CXjFRziU+MGWeB2AlpLhyy1w5AX8Bbwx6+sRkCLkAU80qkVHfIQJUQ4qy5bjpevjsz yVrruxwg==; Received: from [2001:4bb8:18c:1dd6:27b8:b8a1:c13e:ceb1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGzp-0004E3-Vf; Thu, 26 Nov 2020 13:07:38 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , dm-devel@redhat.com, Jan Kara , linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 44/44] block: stop using bdget_disk for partition 0 Date: Thu, 26 Nov 2020 14:04:22 +0100 Message-Id: <20201126130422.92945-45-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201126130422.92945-1-hch@lst.de> References: <20201126130422.92945-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org We can just dereference the point in struct gendisk instead. Also remove the now unused export. Signed-off-by: Christoph Hellwig Reviewed-by: Jan Kara --- block/genhd.c | 1 - drivers/block/nbd.c | 4 +--- drivers/block/xen-blkfront.c | 20 +++++--------------- drivers/block/zram/zram_drv.c | 14 ++------------ drivers/md/dm.c | 16 ++-------------- drivers/s390/block/dasd_ioctl.c | 5 ++--- fs/block_dev.c | 2 +- 7 files changed, 13 insertions(+), 49 deletions(-) diff --git a/block/genhd.c b/block/genhd.c index af76c2fff40d31..01876a162f5813 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -920,7 +920,6 @@ struct block_device *bdget_disk(struct gendisk *disk, int partno) return bdev; } -EXPORT_SYMBOL(bdget_disk); /* * print a full list of all partitions - intended for places where the root diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c index 014683968ce174..92f84ed0ba9eb6 100644 --- a/drivers/block/nbd.c +++ b/drivers/block/nbd.c @@ -1488,12 +1488,10 @@ static int nbd_open(struct block_device *bdev, fmode_t mode) static void nbd_release(struct gendisk *disk, fmode_t mode) { struct nbd_device *nbd = disk->private_data; - struct block_device *bdev = bdget_disk(disk, 0); if (test_bit(NBD_RT_DISCONNECT_ON_CLOSE, &nbd->config->runtime_flags) && - bdev->bd_openers == 0) + disk->part0->bd_openers == 0) nbd_disconnect_and_put(nbd); - bdput(bdev); nbd_config_put(nbd); nbd_put(nbd); diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c index 79521e33d30ed5..188e0b47534bcf 100644 --- a/drivers/block/xen-blkfront.c +++ b/drivers/block/xen-blkfront.c @@ -2153,7 +2153,7 @@ static void blkfront_closing(struct blkfront_info *info) } if (info->gd) - bdev = bdget_disk(info->gd, 0); + bdev = bdgrab(info->gd->part0); mutex_unlock(&info->mutex); @@ -2518,7 +2518,7 @@ static int blkfront_remove(struct xenbus_device *xbdev) disk = info->gd; if (disk) - bdev = bdget_disk(disk, 0); + bdev = bdgrab(disk->part0); info->xbdev = NULL; mutex_unlock(&info->mutex); @@ -2595,19 +2595,11 @@ static int blkif_open(struct block_device *bdev, fmode_t mode) static void blkif_release(struct gendisk *disk, fmode_t mode) { struct blkfront_info *info = disk->private_data; - struct block_device *bdev; struct xenbus_device *xbdev; mutex_lock(&blkfront_mutex); - - bdev = bdget_disk(disk, 0); - - if (!bdev) { - WARN(1, "Block device %s yanked out from us!\n", disk->disk_name); + if (disk->part0->bd_openers) goto out_mutex; - } - if (bdev->bd_openers) - goto out; /* * Check if we have been instructed to close. We will have @@ -2619,7 +2611,7 @@ static void blkif_release(struct gendisk *disk, fmode_t mode) if (xbdev && xbdev->state == XenbusStateClosing) { /* pending switch to state closed */ - dev_info(disk_to_dev(bdev->bd_disk), "releasing disk\n"); + dev_info(disk_to_dev(disk), "releasing disk\n"); xlvbd_release_gendisk(info); xenbus_frontend_closed(info->xbdev); } @@ -2628,14 +2620,12 @@ static void blkif_release(struct gendisk *disk, fmode_t mode) if (!xbdev) { /* sudden device removal */ - dev_info(disk_to_dev(bdev->bd_disk), "releasing disk\n"); + dev_info(disk_to_dev(disk), "releasing disk\n"); xlvbd_release_gendisk(info); disk->private_data = NULL; free_info(info); } -out: - bdput(bdev); out_mutex: mutex_unlock(&blkfront_mutex); } diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c index dc8957d173d37c..b0701bae6e9800 100644 --- a/drivers/block/zram/zram_drv.c +++ b/drivers/block/zram/zram_drv.c @@ -1760,15 +1760,12 @@ static ssize_t reset_store(struct device *dev, return -EINVAL; zram = dev_to_zram(dev); - bdev = bdget_disk(zram->disk, 0); - if (!bdev) - return -ENOMEM; + bdev = zram->disk->part0; mutex_lock(&bdev->bd_mutex); /* Do not reset an active device or claimed device */ if (bdev->bd_openers || zram->claim) { mutex_unlock(&bdev->bd_mutex); - bdput(bdev); return -EBUSY; } @@ -1779,7 +1776,6 @@ static ssize_t reset_store(struct device *dev, /* Make sure all the pending I/O are finished */ fsync_bdev(bdev); zram_reset_device(zram); - bdput(bdev); mutex_lock(&bdev->bd_mutex); zram->claim = false; @@ -1965,16 +1961,11 @@ static int zram_add(void) static int zram_remove(struct zram *zram) { - struct block_device *bdev; - - bdev = bdget_disk(zram->disk, 0); - if (!bdev) - return -ENOMEM; + struct block_device *bdev = zram->disk->part0; mutex_lock(&bdev->bd_mutex); if (bdev->bd_openers || zram->claim) { mutex_unlock(&bdev->bd_mutex); - bdput(bdev); return -EBUSY; } @@ -1986,7 +1977,6 @@ static int zram_remove(struct zram *zram) /* Make sure all the pending I/O are finished */ fsync_bdev(bdev); zram_reset_device(zram); - bdput(bdev); pr_info("Removed device: %s\n", zram->disk->disk_name); diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 176adcff56b380..ed7e836efbcdbc 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -2375,16 +2375,11 @@ struct dm_table *dm_swap_table(struct mapped_device *md, struct dm_table *table) */ static int lock_fs(struct mapped_device *md) { - struct block_device *bdev; int r; WARN_ON(test_bit(DMF_FROZEN, &md->flags)); - bdev = bdget_disk(md->disk, 0); - if (!bdev) - return -ENOMEM; - r = freeze_bdev(bdev); - bdput(bdev); + r = freeze_bdev(md->disk->part0); if (!r) set_bit(DMF_FROZEN, &md->flags); return r; @@ -2392,16 +2387,9 @@ static int lock_fs(struct mapped_device *md) static void unlock_fs(struct mapped_device *md) { - struct block_device *bdev; - if (!test_bit(DMF_FROZEN, &md->flags)) return; - - bdev = bdget_disk(md->disk, 0); - if (!bdev) - return; - thaw_bdev(bdev); - bdput(bdev); + thaw_bdev(md->disk->part0); clear_bit(DMF_FROZEN, &md->flags); } diff --git a/drivers/s390/block/dasd_ioctl.c b/drivers/s390/block/dasd_ioctl.c index 304eba1acf163c..9f642440894655 100644 --- a/drivers/s390/block/dasd_ioctl.c +++ b/drivers/s390/block/dasd_ioctl.c @@ -220,9 +220,8 @@ dasd_format(struct dasd_block *block, struct format_data_t *fdata) * enabling the device later. */ if (fdata->start_unit == 0) { - struct block_device *bdev = bdget_disk(block->gdp, 0); - bdev->bd_inode->i_blkbits = blksize_bits(fdata->blksize); - bdput(bdev); + block->gdp->part0->bd_inode->i_blkbits = + blksize_bits(fdata->blksize); } rc = base->discipline->format_device(base, fdata, 1); diff --git a/fs/block_dev.c b/fs/block_dev.c index 58fd6625966511..4edb9f23092285 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -1295,7 +1295,7 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode) if (ret) return ret; } else { - struct block_device *whole = bdget_disk(disk, 0); + struct block_device *whole = bdgrab(disk->part0); mutex_lock_nested(&whole->bd_mutex, 1); ret = __blkdev_get(whole, mode);