@@ -1048,7 +1048,7 @@ out:
return ret;
}
-int btrfs_del_qgroup_relation(struct btrfs_trans_handle *trans,
+int __del_qgroup_relation(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info, u64 src, u64 dst)
{
struct btrfs_root *quota_root;
@@ -1058,7 +1058,6 @@ int btrfs_del_qgroup_relation(struct btrfs_trans_handle *trans,
int ret = 0;
int err;
- mutex_lock(&fs_info->qgroup_ioctl_lock);
quota_root = fs_info->quota_root;
if (!quota_root) {
ret = -EINVAL;
@@ -1089,7 +1088,18 @@ exist:
del_relation_rb(fs_info, src, dst);
spin_unlock(&fs_info->qgroup_lock);
out:
+ return ret;
+}
+
+int btrfs_del_qgroup_relation(struct btrfs_trans_handle *trans,
+ struct btrfs_fs_info *fs_info, u64 src, u64 dst)
+{
+ int ret = 0;
+
+ mutex_lock(&fs_info->qgroup_ioctl_lock);
+ ret = __del_qgroup_relation(trans, fs_info, src, dst);
mutex_unlock(&fs_info->qgroup_ioctl_lock);
+
return ret;
}
@@ -1132,6 +1142,7 @@ int btrfs_remove_qgroup(struct btrfs_trans_handle *trans,
{
struct btrfs_root *quota_root;
struct btrfs_qgroup *qgroup;
+ struct btrfs_qgroup_list *list;
int ret = 0;
mutex_lock(&fs_info->qgroup_ioctl_lock);
@@ -1146,15 +1157,24 @@ int btrfs_remove_qgroup(struct btrfs_trans_handle *trans,
ret = -ENOENT;
goto out;
} else {
- /* check if there are no relations to this qgroup */
- if (!list_empty(&qgroup->groups) ||
- !list_empty(&qgroup->members)) {
+ /* check if there are no children of this qgroup */
+ if (!list_empty(&qgroup->members)) {
ret = -EBUSY;
goto out;
}
}
ret = del_qgroup_item(trans, quota_root, qgroupid);
+ while (!list_empty(&qgroup->groups)) {
+ list = list_first_entry(&qgroup->groups,
+ struct btrfs_qgroup_list, next_group);
+ ret = __del_qgroup_relation(trans, fs_info,
+ qgroupid,
+ list->group->qgroupid);
+ if (ret)
+ goto out;
+ }
+
spin_lock(&fs_info->qgroup_lock);
del_qgroup_rb(quota_root->fs_info, qgroupid);
spin_unlock(&fs_info->qgroup_lock);
When a qgroup has parents but no child, it should be removable in Theory. 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 qgroup 1/0. 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. Signed-off-by: Dongsheng Yang <yangds.fnst@cn.fujitsu.com> --- fs/btrfs/qgroup.c | 30 +++++++++++++++++++++++++----- 1 file changed, 25 insertions(+), 5 deletions(-)