From patchwork Tue May 7 07:19:22 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nikolay Borisov X-Patchwork-Id: 10932371 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 70E5B15A6 for ; Tue, 7 May 2019 07:19:33 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5675D2848D for ; Tue, 7 May 2019 07:19:33 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 4AFA2287AA; Tue, 7 May 2019 07:19:33 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E603D2881C for ; Tue, 7 May 2019 07:19:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726874AbfEGHT3 (ORCPT ); Tue, 7 May 2019 03:19:29 -0400 Received: from mx2.suse.de ([195.135.220.15]:53542 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726720AbfEGHT2 (ORCPT ); Tue, 7 May 2019 03:19:28 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 5C8BFAC3B for ; Tue, 7 May 2019 07:19:27 +0000 (UTC) From: Nikolay Borisov To: linux-btrfs@vger.kernel.org Cc: Nikolay Borisov Subject: [PATCH v2 1/3] btrfs: Implement btrfs_lock_and_flush_ordered_range Date: Tue, 7 May 2019 10:19:22 +0300 Message-Id: <20190507071924.17643-2-nborisov@suse.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190507071924.17643-1-nborisov@suse.com> References: <20190507071924.17643-1-nborisov@suse.com> Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP There is a certain idiom used in multiple places in btrfs' codebase, dealing with flushing an ordered range. Factor this in a separate function that can be reused. Future patches will replace the existing code with that function. Signed-off-by: Nikolay Borisov --- fs/btrfs/ordered-data.c | 33 +++++++++++++++++++++++++++++++++ fs/btrfs/ordered-data.h | 4 ++++ 2 files changed, 37 insertions(+) diff --git a/fs/btrfs/ordered-data.c b/fs/btrfs/ordered-data.c index 52889da69113..37401cc04a6b 100644 --- a/fs/btrfs/ordered-data.c +++ b/fs/btrfs/ordered-data.c @@ -962,6 +962,39 @@ int btrfs_find_ordered_sum(struct inode *inode, u64 offset, u64 disk_bytenr, return index; } +/* + * btrfs_flush_ordered_range - Lock the passed range and ensures all pending + * ordered extents in it are run to completion. + * + * @tree: IO tree used for locking out other users of the range + * @inode: Inode whose ordered tree is to be searched + * @start: Beginning of range to flush + * @end: Last byte of range to lock + * @cached_state: If passed, will return the extent state responsible for the + * locked range. It's the caller's responsibility to free the cached state. + * + * This function always returns with the given range locked, ensuring after it's + * called no order extent can be pending. + */ +void btrfs_lock_and_flush_ordered_range(struct extent_io_tree *tree, + struct btrfs_inode *inode, u64 start, + u64 end, + struct extent_state **cached_state) +{ + struct btrfs_ordered_extent *ordered; + + while (1) { + lock_extent_bits(tree, start, end, cached_state); + ordered = btrfs_lookup_ordered_range(inode, start, + end - start + 1); + if (!ordered) + break; + unlock_extent_cached(tree, start, end, cached_state); + btrfs_start_ordered_extent(&inode->vfs_inode, ordered, 1); + btrfs_put_ordered_extent(ordered); + } +} + int __init ordered_data_init(void) { btrfs_ordered_extent_cache = kmem_cache_create("btrfs_ordered_extent", diff --git a/fs/btrfs/ordered-data.h b/fs/btrfs/ordered-data.h index 4c5991c3de14..9b68179d580f 100644 --- a/fs/btrfs/ordered-data.h +++ b/fs/btrfs/ordered-data.h @@ -188,6 +188,10 @@ u64 btrfs_wait_ordered_extents(struct btrfs_root *root, u64 nr, const u64 range_start, const u64 range_len); u64 btrfs_wait_ordered_roots(struct btrfs_fs_info *fs_info, u64 nr, const u64 range_start, const u64 range_len); +void btrfs_lock_and_flush_ordered_range(struct extent_io_tree *tree, + struct btrfs_inode *inode, u64 start, + u64 end, + struct extent_state **cached_state); int __init ordered_data_init(void); void __cold ordered_data_exit(void);