Dongsheng Yang
f5a6b1c53b
btrfs: qgroup: allow to remove qgroup which has parent but no child. ...
When a qgroup has parents but no child, it should be removable in
Theory I think. But currently, we can not remove it when it has
either parent or child.
Example:
# btrfs quota enable /mnt
# btrfs qgroup create 1/0 /mnt
# btrfs qgroup create 2/0 /mnt
# btrfs qgroup assign 1/0 2/0 /mnt
# btrfs qgroup show -pcre /mnt
qgroupid rfer excl max_rfer max_excl parent child
-------- ---- ---- -------- -------- ------ -----
0/5 16384 16384 0 0 --- ---
1/0 0 0 0 0 2/0 ---
2/0 0 0 0 0 --- 1/0
At this time, there is no subvol or qgroup depending on it.
Just a qgroup 2/0 is its parent, but 2/0 can work well without
1/0. So I think 1/0 should be removalbe. But:
# btrfs qgroup destroy 1/0 /mnt
ERROR: unable to destroy quota group: Device or resource busy
This patch remove the check of qgroup->parent in removing it,
then we can remove a qgroup when it has a parent.
Signed-off-by: Dongsheng Yang <yangds.fnst@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
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