Btrfs: creating the subvolume qgroup automatically when enabling quota
Creating the subvolume/snapshots(including root subvolume) qgroup
auotomatically when enabling quota.
Signed-off-by: Wang Shilong <wangsl-fnst@cn.fujitsu.com>
Reviewed-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 9c44d65..4fc9751 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -3697,6 +3697,7 @@
goto drop_write;
}
+ down_write(&root->fs_info->subvol_sem);
if (sa->cmd != BTRFS_QUOTA_CTL_RESCAN) {
trans = btrfs_start_transaction(root, 2);
if (IS_ERR(trans)) {
@@ -3730,6 +3731,7 @@
}
out:
kfree(sa);
+ up_write(&root->fs_info->subvol_sem);
drop_write:
mnt_drop_write_file(file);
return ret;