diff options
Diffstat (limited to 'fs/btrfs/qgroup.c')
| -rw-r--r-- | fs/btrfs/qgroup.c | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c index b3bf08fc2a39..af241aaa654a 100644 --- a/fs/btrfs/qgroup.c +++ b/fs/btrfs/qgroup.c @@ -3046,6 +3046,57 @@ int btrfs_run_qgroups(struct btrfs_trans_handle *trans) return ret; } +int btrfs_qgroup_check_inherit(struct btrfs_fs_info *fs_info, + struct btrfs_qgroup_inherit *inherit, + size_t size) +{ + if (inherit->flags & ~BTRFS_QGROUP_INHERIT_FLAGS_SUPP) + return -EOPNOTSUPP; + if (size < sizeof(*inherit) || size > PAGE_SIZE) + return -EINVAL; + + /* + * In the past we allowed btrfs_qgroup_inherit to specify to copy + * rfer/excl numbers directly from other qgroups. This behavior has + * been disabled in userspace for a very long time, but here we should + * also disable it in kernel, as this behavior is known to mark qgroup + * inconsistent, and a rescan would wipe out the changes anyway. + * + * Reject any btrfs_qgroup_inherit with num_ref_copies or num_excl_copies. + */ + if (inherit->num_ref_copies > 0 || inherit->num_excl_copies > 0) + return -EINVAL; + + if (inherit->num_qgroups > PAGE_SIZE) + return -EINVAL; + + if (size != struct_size(inherit, qgroups, inherit->num_qgroups)) + return -EINVAL; + + /* + * Now check all the remaining qgroups, they should all: + * + * - Exist + * - Be higher level qgroups. + */ + for (int i = 0; i < inherit->num_qgroups; i++) { + struct btrfs_qgroup *qgroup; + u64 qgroupid = inherit->qgroups[i]; + + if (btrfs_qgroup_level(qgroupid) == 0) + return -EINVAL; + + spin_lock(&fs_info->qgroup_lock); + qgroup = find_qgroup_rb(fs_info, qgroupid); + if (!qgroup) { + spin_unlock(&fs_info->qgroup_lock); + return -ENOENT; + } + spin_unlock(&fs_info->qgroup_lock); + } + return 0; +} + static int qgroup_auto_inherit(struct btrfs_fs_info *fs_info, u64 inode_rootid, struct btrfs_qgroup_inherit **inherit) |