[BUG]
In the following case, rescan won't zero out the number of qgroup 1/0:
------
$ mkfs.btrfs -fq $DEV
$ mount $DEV /mnt
$ btrfs quota enable /mnt
$ btrfs qgroup create 1/0 /mnt
$ btrfs sub create /mnt/sub
$ btrfs qgroup assign 0/257 1/0 /mnt
$ dd if=/dev/urandom of=/mnt/sub/file bs=1k count=1000
$ btrfs sub snap /mnt/sub /mnt/snap
$ btrfs quota rescan -w /mnt
$ btrfs qgroup show -pcre /mnt
qgroupid rfer excl max_rfer max_excl parent child
-------- ---- ---- -------- -------- ------ -----
0/5 16.00KiB 16.00KiB none none --- ---
0/257 1016.00KiB 16.00KiB none none 1/0 ---
0/258 1016.00KiB 16.00KiB none none --- ---
1/0 1016.00KiB 16.00KiB none none --- 0/257
so far so good, but:
$ btrfs qgroup remove 0/257 1/0 /mnt
WARNING: quotas may be inconsistent, rescan needed
$ btrfs quota rescan -w /mnt
$ btrfs qgroup show -pcre /mnt
qgoupid rfer excl max_rfer max_excl parent child
-------- ---- ---- -------- -------- ------ -----
0/5 16.00KiB 16.00KiB none none --- ---
0/257 1016.00KiB 16.00KiB none none --- ---
0/258 1016.00KiB 16.00KiB none none --- ---
1/0 1016.00KiB 16.00KiB none none --- ---
^^^^^^^^^^ ^^^^^^^^ not cleared
------
[CAUSE]
Before rescan we call qgroup_rescan_zero_tracking() to zero out all
qgroups' accounting numbers.
However we don't mark all qgroups dirty, but rely on rescan to mark
qgroups dirty.
If we have any high level qgroup but without any child (orphan group), it
won't be marked dirty during rescan, since we can not reach that qgroup.
This will cause QGROUP_INFO items of orphan qgroups never get updated in
quota tree, thus their numbers will stay the same in "btrfs qgroup show"
output.
[FIX]
Just mark all qgroups dirty in qgroup_rescan_zero_tracking(), so even we
have orphan qgroups their QGROUP_INFO items will still get updated during
rescan.
Reported-by: Misono Tomohiro <misono.tomoh...@jp.fujitsu.com>
Signed-off-by: Qu Wenruo <w...@suse.com>
---
changelog:
v2:
Fix some grammar errors in commit message.
---
fs/btrfs/qgroup.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c
index 48c1c3e7baf3..5a5372b33d96 100644
--- a/fs/btrfs/qgroup.c
+++ b/fs/btrfs/qgroup.c
@@ -2864,6 +2864,7 @@ qgroup_rescan_zero_tracking(struct btrfs_fs_info *fs_info)
qgroup->rfer_cmpr = 0;
qgroup->excl = 0;
qgroup->excl_cmpr = 0;
+ qgroup_dirty(fs_info, qgroup);
}
spin_unlock(&fs_info->qgroup_lock);
}
--
2.18.0
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