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btrfs: qgroup: remove duplicated check in adding qgroup relations

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Removes duplicated check when adding qgroup relations.
btrfs_add_qgroup_relations function adds relations by calling
add_relation_rb(). add_relation_rb() checks that member/parentid exists
in current qgroup_tree. But it already checked before calling the
function. It seems that we don't need to double check.

Add new function __add_relation_rb() that adds relations with
qgroup structures and makes old function use the new one. And it makes
btrfs_add_qgroup_relation() function work without double checks by
calling the new function.

Signed-off-by: Sidong Yang <realwakka@gmail.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ add comments ]
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Sidong Yang 2022-02-06 12:52:48 +00:00 committed by David Sterba
parent dc4a4bdb3f
commit a8f6f619e4
1 changed files with 32 additions and 9 deletions
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41
fs/btrfs/qgroup.c
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@ -258,16 +258,19 @@ static int del_qgroup_rb(struct btrfs_fs_info *fs_info, u64 qgroupid)
return 0;
}
/* must be called with qgroup_lock held */
static int add_relation_rb(struct btrfs_fs_info *fs_info,
u64 memberid, u64 parentid)
/*
* Add relation specified by two qgroups.
*
* Must be called with qgroup_lock held.
*
* Return: 0 on success
* -ENOENT if one of the qgroups is NULL
* <0 other errors
*/
static int __add_relation_rb(struct btrfs_qgroup *member, struct btrfs_qgroup *parent)
{
struct btrfs_qgroup *member;
struct btrfs_qgroup *parent;
struct btrfs_qgroup_list *list;
member = find_qgroup_rb(fs_info, memberid);
parent = find_qgroup_rb(fs_info, parentid);
if (!member || !parent)
return -ENOENT;
@ -283,7 +286,27 @@ static int add_relation_rb(struct btrfs_fs_info *fs_info,
return 0;
}
/* must be called with qgroup_lock held */
/*
* Add relation specified by two qgoup ids.
*
* Must be called with qgroup_lock held.
*
* Return: 0 on success
* -ENOENT if one of the ids does not exist
* <0 other errors
*/
static int add_relation_rb(struct btrfs_fs_info *fs_info, u64 memberid, u64 parentid)
{
struct btrfs_qgroup *member;
struct btrfs_qgroup *parent;
member = find_qgroup_rb(fs_info, memberid);
parent = find_qgroup_rb(fs_info, parentid);
return __add_relation_rb(member, parent);
}
/* Must be called with qgroup_lock held */
static int del_relation_rb(struct btrfs_fs_info *fs_info,
u64 memberid, u64 parentid)
{
@ -1457,7 +1480,7 @@ int btrfs_add_qgroup_relation(struct btrfs_trans_handle *trans, u64 src,
}
spin_lock(&fs_info->qgroup_lock);
ret = add_relation_rb(fs_info, src, dst);
ret = __add_relation_rb(member, parent);
if (ret < 0) {
spin_unlock(&fs_info->qgroup_lock);
goto out;