[PATCH] btrfs: quota: Reset rescan progress if we hit last leaf

[PATCH] btrfs: quota: Reset rescan progress if we hit last leaf

[Qu Wenruo]

Commit ff3d27a048d9 ("btrfs: qgroup: Finish rescan when hit the last leaf of extent tree")
added a new exit for rescan finish.

However after finishing quota rescan, we set
fs_info->qgroup_rescan_progress to (u64)-1, as qgroup_rescan_progress is also
used to determine whether we should account dirty extents.
Since if dirty extents is after qgroup_rescan_progress, we don't need to
account it as rescan will account them later.

Without properly setting qgroup_rescan_progress to (u64)-1, all later
dirty extents after qgroup_rescan_progress will be ignored, thus
screwing up the whole quota accounting.

Reported-by: Misono Tomohiro <misono.tomohiro@jp.fujitsu.com>
Fixes: ff3d27a048d9 ("btrfs: qgroup: Finish rescan when hit the last leaf of extent tree")
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
 fs/btrfs/qgroup.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c
index 1874a6d2e6f5..99f2b9ce0f15 100644
--- a/fs/btrfs/qgroup.c
+++ b/fs/btrfs/qgroup.c
@@ -2680,8 +2680,10 @@ qgroup_rescan_leaf(struct btrfs_fs_info *fs_info, struct btrfs_path *path,
 		free_extent_buffer(scratch_leaf);
 	}
 
-	if (done && !ret)
+	if (done && !ret) {
 		ret = 1;
+		fs_info->qgroup_rescan_progress.objectid = (u64)-1;
+	}
 	return ret;
 }
 
-- 
2.18.0