From patchwork Tue Jan 26 08:33:47 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Qu Wenruo X-Patchwork-Id: 12047713 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=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,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 0A03FC4332B for ; Tue, 26 Jan 2021 18:36:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CEB5E2223D for ; Tue, 26 Jan 2021 18:36:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730856AbhAZRX3 (ORCPT ); Tue, 26 Jan 2021 12:23:29 -0500 Received: from mx2.suse.de ([195.135.220.15]:54362 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390262AbhAZIfI (ORCPT ); Tue, 26 Jan 2021 03:35:08 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1611650061; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=53sXpeOi0krDhFcsRtSKZuJon3LKbdzOpHmgNvB7MFQ=; b=G965OtYBidwsgssnp0NU1N7tx0ZDL66YTiyi8Jqyd+Gb6meMtKz0ZTiTZ6YCycb2S1cUUk GdbItFKkzXgMZUoKRCBU6TRvyo/fCwSaoQEOI1qZcuRfBLkKPRyMTmPuyhvgxhhyqXkeAW 2bC5zeUBFEzdB4XvbYub8kWBR25JSds= Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id D202CAF38; Tue, 26 Jan 2021 08:34:21 +0000 (UTC) From: Qu Wenruo To: linux-btrfs@vger.kernel.org Cc: Josef Bacik , David Sterba Subject: [PATCH v5 03/18] btrfs: introduce the skeleton of btrfs_subpage structure Date: Tue, 26 Jan 2021 16:33:47 +0800 Message-Id: <20210126083402.142577-4-wqu@suse.com> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20210126083402.142577-1-wqu@suse.com> References: <20210126083402.142577-1-wqu@suse.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org For sectorsize < page size support, we need a structure to record extra status info for each sector of a page. Introduce the skeleton structure, all subpage related code would go to subpage.[ch]. Reviewed-by: Josef Bacik Signed-off-by: Qu Wenruo Reviewed-by: David Sterba Signed-off-by: David Sterba --- fs/btrfs/Makefile | 3 ++- fs/btrfs/subpage.c | 43 +++++++++++++++++++++++++++++++++++++++++++ fs/btrfs/subpage.h | 33 +++++++++++++++++++++++++++++++++ fs/btrfs/super.c | 1 - 4 files changed, 78 insertions(+), 2 deletions(-) create mode 100644 fs/btrfs/subpage.c create mode 100644 fs/btrfs/subpage.h diff --git a/fs/btrfs/Makefile b/fs/btrfs/Makefile index 9f1b1a88e317..942562e11456 100644 --- a/fs/btrfs/Makefile +++ b/fs/btrfs/Makefile @@ -11,7 +11,8 @@ btrfs-y += super.o ctree.o extent-tree.o print-tree.o root-tree.o dir-item.o \ compression.o delayed-ref.o relocation.o delayed-inode.o scrub.o \ reada.o backref.o ulist.o qgroup.o send.o dev-replace.o raid56.o \ uuid-tree.o props.o free-space-tree.o tree-checker.o space-info.o \ - block-rsv.o delalloc-space.o block-group.o discard.o reflink.o + block-rsv.o delalloc-space.o block-group.o discard.o reflink.o \ + subpage.o btrfs-$(CONFIG_BTRFS_FS_POSIX_ACL) += acl.o btrfs-$(CONFIG_BTRFS_FS_CHECK_INTEGRITY) += check-integrity.o diff --git a/fs/btrfs/subpage.c b/fs/btrfs/subpage.c new file mode 100644 index 000000000000..a3e5b6a13d54 --- /dev/null +++ b/fs/btrfs/subpage.c @@ -0,0 +1,43 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include +#include "ctree.h" +#include "subpage.h" + +int btrfs_attach_subpage(const struct btrfs_fs_info *fs_info, + struct page *page, enum btrfs_subpage_type type) +{ + struct btrfs_subpage *subpage; + + /* + * We have cases like a dummy extent buffer page, which is not mappped + * and doesn't need to be locked. + */ + if (page->mapping) + ASSERT(PageLocked(page)); + /* Either not subpage, or the page already has private attached */ + if (fs_info->sectorsize == PAGE_SIZE || PagePrivate(page)) + return 0; + + subpage = kzalloc(sizeof(struct btrfs_subpage), GFP_NOFS); + if (!subpage) + return -ENOMEM; + + spin_lock_init(&subpage->lock); + attach_page_private(page, subpage); + return 0; +} + +void btrfs_detach_subpage(const struct btrfs_fs_info *fs_info, + struct page *page) +{ + struct btrfs_subpage *subpage; + + /* Either not subpage, or already detached */ + if (fs_info->sectorsize == PAGE_SIZE || !PagePrivate(page)) + return; + + subpage = (struct btrfs_subpage *)detach_page_private(page); + ASSERT(subpage); + kfree(subpage); +} diff --git a/fs/btrfs/subpage.h b/fs/btrfs/subpage.h new file mode 100644 index 000000000000..676280bc7562 --- /dev/null +++ b/fs/btrfs/subpage.h @@ -0,0 +1,33 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#ifndef BTRFS_SUBPAGE_H +#define BTRFS_SUBPAGE_H + +#include + +/* + * Maximum page size we support is 64K, minimum sector size is 4K, u16 bitmap + * is sufficient. Regular bitmap_* is not used due to size reasons. + */ +#define BTRFS_SUBPAGE_BITMAP_SIZE 16 + +/* + * Structure to trace status of each sector inside a page, attached to + * page::private for both data and metadata inodes. + */ +struct btrfs_subpage { + /* Common members for both data and metadata pages */ + spinlock_t lock; +}; + +enum btrfs_subpage_type { + BTRFS_SUBPAGE_METADATA, + BTRFS_SUBPAGE_DATA, +}; + +int btrfs_attach_subpage(const struct btrfs_fs_info *fs_info, + struct page *page, enum btrfs_subpage_type type); +void btrfs_detach_subpage(const struct btrfs_fs_info *fs_info, + struct page *page); + +#endif diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index 12d7d3be7cd4..919ed5c357e9 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -48,7 +48,6 @@ #include "tests/btrfs-tests.h" #include "block-group.h" #include "discard.h" - #include "qgroup.h" #define CREATE_TRACE_POINTS #include