summaryrefslogtreecommitdiffstats
path: root/fs/btrfs/qgroup.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/btrfs/qgroup.c')
-rw-r--r--fs/btrfs/qgroup.c55
1 files changed, 54 insertions, 1 deletions
diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c
index 1dcf5bb8df..132802bd80 100644
--- a/fs/btrfs/qgroup.c
+++ b/fs/btrfs/qgroup.c
@@ -194,7 +194,7 @@ static struct btrfs_qgroup *find_qgroup_rb(struct btrfs_fs_info *fs_info,
*
* Must be called with qgroup_lock held and @prealloc preallocated.
*
- * The control on the lifespan of @prealloc would be transfered to this
+ * The control on the lifespan of @prealloc would be transferred to this
* function, thus caller should no longer touch @prealloc.
*/
static struct btrfs_qgroup *add_qgroup_rb(struct btrfs_fs_info *fs_info,
@@ -3048,6 +3048,57 @@ 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)
@@ -4381,6 +4432,8 @@ void btrfs_qgroup_convert_reserved_meta(struct btrfs_root *root, int num_bytes)
BTRFS_QGROUP_RSV_META_PREALLOC);
trace_qgroup_meta_convert(root, num_bytes);
qgroup_convert_meta(fs_info, root->root_key.objectid, num_bytes);
+ if (!sb_rdonly(fs_info->sb))
+ add_root_meta_rsv(root, num_bytes, BTRFS_QGROUP_RSV_META_PERTRANS);
}
/*