Return-Path: Received: from mail.kernel.org ([198.145.29.99]:58222 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750711AbeEKPmr (ORCPT ); Fri, 11 May 2018 11:42:47 -0400 Received: from debian3.lan (bl12-226-64.dsl.telepac.pt [85.245.226.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 4B07A21783 for ; Fri, 11 May 2018 15:42:46 +0000 (UTC) From: fdmanana@kernel.org To: linux-btrfs@vger.kernel.org Subject: [PATCH] Btrfs: fix xattr loss after power failure Date: Fri, 11 May 2018 16:42:42 +0100 Message-Id: <20180511154242.12904-1-fdmanana@kernel.org> Sender: linux-btrfs-owner@vger.kernel.org List-ID: From: Filipe Manana If a file has xattrs, we fsync it, to ensure we clear the flags BTRFS_INODE_NEEDS_FULL_SYNC and BTRFS_INODE_COPY_EVERYTHING from its inode, the current transaction commits and then we fsync it (without either of those bits being set in its inode), we end up not logging all its xattrs. This results in deleting all xattrs when replying the log after a power failure. Trivial reproducer $ mkfs.btrfs -f /dev/sdb $ mount /dev/sdb /mnt $ touch /mnt/foobar $ setfattr -n user.xa -v qwerty /mnt/foobar $ xfs_io -c "fsync" /mnt/foobar $ sync $ xfs_io -c "pwrite -S 0xab 0 64K" /mnt/foobar $ xfs_io -c "fsync" /mnt/foobar $ mount /dev/sdb /mnt $ getfattr --absolute-names --dump /mnt/foobar $ So fix this by making sure all xattrs are logged if we log a file's inode item and neither the flags BTRFS_INODE_NEEDS_FULL_SYNC nor BTRFS_INODE_COPY_EVERYTHING were set in the inode. Fixes: 36283bf777d9 ("Btrfs: fix fsync xattr loss in the fast fsync path") Cc: Signed-off-by: Filipe Manana --- fs/btrfs/tree-log.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c index 25b888df00c9..d656de8bec52 100644 --- a/fs/btrfs/tree-log.c +++ b/fs/btrfs/tree-log.c @@ -4916,6 +4916,7 @@ static int btrfs_log_inode(struct btrfs_trans_handle *trans, struct extent_map_tree *em_tree = &inode->extent_tree; u64 logged_isize = 0; bool need_log_inode_item = true; + bool xattrs_logged = false; path = btrfs_alloc_path(); if (!path) @@ -5217,6 +5218,7 @@ static int btrfs_log_inode(struct btrfs_trans_handle *trans, err = btrfs_log_all_xattrs(trans, root, inode, path, dst_path); if (err) goto out_unlock; + xattrs_logged = true; if (max_key.type >= BTRFS_EXTENT_DATA_KEY && !fast_search) { btrfs_release_path(path); btrfs_release_path(dst_path); @@ -5229,6 +5231,11 @@ static int btrfs_log_inode(struct btrfs_trans_handle *trans, btrfs_release_path(dst_path); if (need_log_inode_item) { err = log_inode_item(trans, log, dst_path, inode); + if (!err && !xattrs_logged) { + err = btrfs_log_all_xattrs(trans, root, inode, path, + dst_path); + btrfs_release_path(path); + } if (err) goto out_unlock; } -- 2.11.0