btrfs: fix qgroup_free wrong num_bytes in btrfs_subvolume_reserve_metadata

After btrfs_qgroup_reserve_meta_prealloc(), num_bytes will be assigned
again by btrfs_calc_trans_metadata_size(). Once block_rsv fails, we
can't properly free the num_bytes of the previous qgroup_reserve. Use a
separate variable to store the num_bytes of the qgroup_reserve.

Delete the comment for the qgroup_reserved that does not exist and add a
comment about use_global_rsv.

Fixes: c4c129db5da8 ("btrfs: drop unused parameter qgroup_reserved")
CC: stable@vger.kernel.org # 4.18+
Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

1 files changed, 8 insertions, 9 deletions

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index de6f75f5547b..2d9074295d7f 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -5800,7 +5800,7 @@ void btrfs_trans_release_chunk_metadata(struct btrfs_trans_handle *trans)
  * root: the root of the parent directory
  * rsv: block reservation
  * items: the number of items that we need do reservation
- * qgroup_reserved: used to return the reserved size in qgroup
+ * use_global_rsv: allow fallback to the global block reservation
  *
  * This function is used to reserve the space for snapshot/subvolume
  * creation and deletion. Those operations are different with the
@@ -5810,10 +5810,10 @@ void btrfs_trans_release_chunk_metadata(struct btrfs_trans_handle *trans)
  * the space reservation mechanism in start_transaction().
  */
 int btrfs_subvolume_reserve_metadata(struct btrfs_root *root,
-                                     struct btrfs_block_rsv *rsv,
-                                     int items,
+                                     struct btrfs_block_rsv *rsv, int items,
                                      bool use_global_rsv)
 {
+        u64 qgroup_num_bytes = 0;
         u64 num_bytes;
         int ret;
         struct btrfs_fs_info *fs_info = root->fs_info;
@@ -5821,12 +5821,11 @@ int btrfs_subvolume_reserve_metadata(struct btrfs_root *root,
 
         if (test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags)) {
                 /* One for parent inode, two for dir entries */
-                num_bytes = 3 * fs_info->nodesize;
-                ret = btrfs_qgroup_reserve_meta_prealloc(root, num_bytes, true);
+                qgroup_num_bytes = 3 * fs_info->nodesize;
+                ret = btrfs_qgroup_reserve_meta_prealloc(root,
+                                qgroup_num_bytes, true);
                 if (ret)
                         return ret;
-        } else {
-                num_bytes = 0;
         }
 
         num_bytes = btrfs_calc_trans_metadata_size(fs_info, items);
@@ -5838,8 +5837,8 @@ int btrfs_subvolume_reserve_metadata(struct btrfs_root *root,
         if (ret == -ENOSPC && use_global_rsv)
                 ret = btrfs_block_rsv_migrate(global_rsv, rsv, num_bytes, 1);
 
-        if (ret && num_bytes)
-                btrfs_qgroup_free_meta_prealloc(root, num_bytes);
+        if (ret && qgroup_num_bytes)
+                btrfs_qgroup_free_meta_prealloc(root, qgroup_num_bytes);
 
         return ret;
 }