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btrfs: Check qgroup level in kernel qgroup assign.

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Although we have qgroup level check in btrfs-progs, it's not enough
since other programe may still call ioctl directly not using
btrfs-progs. For example, systemd.

But it's btrfs-progs to be blame since we don't provide a
full-function(like subvolume create things) btrfs library with enough
check, and only rely on kernel ioctl.

So Add level checks in kernel too.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Reviewed-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Qu Wenruo 2015-02-27 16:24:22 +08:00 committed by Chris Mason
parent f5a6b1c53b
commit 8465ecec96
2 changed files with 10 additions and 0 deletions
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6
fs/btrfs/ctree.h
View File

@ -1061,6 +1061,12 @@ struct btrfs_block_group_item {
__le64 flags;
} __attribute__ ((__packed__));
#define BTRFS_QGROUP_LEVEL_SHIFT 48
static inline u64 btrfs_qgroup_level(u64 qgroupid)
{
return qgroupid >> BTRFS_QGROUP_LEVEL_SHIFT;
}
/*
* is subvolume quota turned on?
*/

4
fs/btrfs/qgroup.c
View File

@ -1009,6 +1009,10 @@ int btrfs_add_qgroup_relation(struct btrfs_trans_handle *trans,
struct btrfs_qgroup_list *list;
int ret = 0;
/* Check the level of src and dst first */
if (btrfs_qgroup_level(src) >= btrfs_qgroup_level(dst))
return -EINVAL;
mutex_lock(&fs_info->qgroup_ioctl_lock);
quota_root = fs_info->quota_root;
if (!quota_root) {