6.12-stable review patch. If anyone has any objections, please let me know.
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From: Qu Wenruo wqu@suse.com
[ Upstream commit c9c863793395cf0a66c2778a29d72c48c02fbb66 ]
[BUG] There is a bug report that btrfs outputs the following error message:
BTRFS info (device nvme0n1p2): qgroup scan completed (inconsistency flag cleared) BTRFS warning (device nvme0n1p2): failed to cleanup qgroup 0/1179: -2
[CAUSE] The error itself is pretty harmless, and the end user should ignore it.
When a subvolume is fully dropped, btrfs will call btrfs_qgroup_cleanup_dropped_subvolume() to delete the qgroup.
However if a qgroup rescan happened before a subvolume fully dropped, qgroup for that subvolume will not be re-created, as rescan will only create new qgroup if there is a BTRFS_ROOT_REF_KEY found.
But before we drop a subvolume, the subvolume is unlinked thus there is no BTRFS_ROOT_REF_KEY.
In that case, btrfs_remove_qgroup() will fail with -ENOENT and trigger the above error message.
[FIX] Just ignore -ENOENT error from btrfs_remove_qgroup() inside btrfs_qgroup_cleanup_dropped_subvolume().
Reported-by: John Shand jshand2013@gmail.com Link: https://bugzilla.suse.com/show_bug.cgi?id=1236056 Fixes: 839d6ea4f86d ("btrfs: automatically remove the subvolume qgroup") Reviewed-by: Filipe Manana fdmanana@suse.com Signed-off-by: Qu Wenruo wqu@suse.com Reviewed-by: David Sterba dsterba@suse.com Signed-off-by: David Sterba dsterba@suse.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/btrfs/qgroup.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c index 4fcd6cd4c1c24..fa9025c05d4e2 100644 --- a/fs/btrfs/qgroup.c +++ b/fs/btrfs/qgroup.c @@ -1916,8 +1916,11 @@ int btrfs_qgroup_cleanup_dropped_subvolume(struct btrfs_fs_info *fs_info, u64 su /* * It's squota and the subvolume still has numbers needed for future * accounting, in this case we can not delete it. Just skip it. + * + * Or the qgroup is already removed by a qgroup rescan. For both cases we're + * safe to ignore them. */ - if (ret == -EBUSY) + if (ret == -EBUSY || ret == -ENOENT) ret = 0; return ret; }