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Commit a5b7f429 authored by Lu Fengqi's avatar Lu Fengqi Committed by David Sterba
Browse files

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: c4c129db ("btrfs: drop unused parameter qgroup_reserved")
CC: stable@vger.kernel.org # 4.18+
Signed-off-by: default avatarLu Fengqi <lufq.fnst@cn.fujitsu.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent de02b9f6

fs/btrfs/extent-tree.c

+8 −9
Original line number Diff line number Diff line
@@ -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;

}