btrfs: Incorrect exclusive reference number after file clone.

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[Problem]
Since commit fcebe4562dec83b3f8d308 ("Btrfs: rework qgroup accounting"),
quota data update is delayed after delayed_ref calculation, and lacks
correct protection to detect root reference which shouldn't be counted
in current sequence number but already written into extent backref.

This makes exclusive reference not decreased correctly and give incorrect
result.

[Test procedure]
1. Create a btrfs with 3 subvolumes, quota enabled and rescanned.
2. Create a file in 1st subvolume
3. Clone the file to 2nd and 3rd subvolume
4. Sync the fs to reflect the changes in qgroup.
5. Check the qgroup data

[Expected result]
None of the subvolume has exclusive reference to the file.

[Actual result]
The first subvolume still have exclusive reference to the file.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

This commit is contained in:

Qu Wenruo

2015-05-04 22:56:13 +10:00

committed by

Dave Chinner

parent 842c5a5941

commit f24afad0f8

3 changed files with 110 additions and 0 deletions

tests/btrfs/group

View File

@@ -92,3 +92,4 @@
 auto quick send
 auto quick metadata
 auto quick metadata
 auto quick qgroup