btrfs: factor out sysfs code for creating space infos

Move creation of data/metadata/system space info directories to sysfs.c.
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/space-info.c

@@ -34,23 +34,6 @@ void btrfs_clear_space_info_full(struct btrfs_fs_info *info)
 	rcu_read_unlock();
 }
 
-static const char *alloc_name(u64 flags)
-{
-	switch (flags) {
-	case BTRFS_BLOCK_GROUP_METADATA|BTRFS_BLOCK_GROUP_DATA:
-		return "mixed";
-	case BTRFS_BLOCK_GROUP_METADATA:
-		return "metadata";
-	case BTRFS_BLOCK_GROUP_DATA:
-		return "data";
-	case BTRFS_BLOCK_GROUP_SYSTEM:
-		return "system";
-	default:
-		WARN_ON(1);
-		return "invalid-combination";
-	};
-}
-
 static int create_space_info(struct btrfs_fs_info *info, u64 flags)
 {
 
@@ -80,13 +63,9 @@ static int create_space_info(struct btrfs_fs_info *info, u64 flags)
 	INIT_LIST_HEAD(&space_info->tickets);
 	INIT_LIST_HEAD(&space_info->priority_tickets);
 
-	ret = kobject_init_and_add(&space_info->kobj, &space_info_ktype,
-				    info->space_info_kobj, "%s",
-				    alloc_name(space_info->flags));
-	if (ret) {
-		kobject_put(&space_info->kobj);
+	ret = btrfs_sysfs_add_space_info_type(info, space_info);
+	if (ret)
 		return ret;
-	}
 
 	list_add_rcu(&space_info->list, &info->space_info);
 	if (flags & BTRFS_BLOCK_GROUP_DATA)

fs/btrfs/sysfs.c

@@ -795,6 +795,43 @@ void btrfs_sysfs_add_block_group_type(struct btrfs_block_group_cache *cache)
 	space_info->block_group_kobjs[index] = &rkobj->kobj;
 }
 
+static const char *alloc_name(u64 flags)
+{
+	switch (flags) {
+	case BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA:
+		return "mixed";
+	case BTRFS_BLOCK_GROUP_METADATA:
+		return "metadata";
+	case BTRFS_BLOCK_GROUP_DATA:
+		return "data";
+	case BTRFS_BLOCK_GROUP_SYSTEM:
+		return "system";
+	default:
+		WARN_ON(1);
+		return "invalid-combination";
+	};
+}
+
+/*
+ * Create a sysfs entry for a space info type at path
+ * /sys/fs/btrfs/UUID/allocation/TYPE
+ */
+int btrfs_sysfs_add_space_info_type(struct btrfs_fs_info *fs_info,
+				    struct btrfs_space_info *space_info)
+{
+	int ret;
+
+	ret = kobject_init_and_add(&space_info->kobj, &space_info_ktype,
+				   fs_info->space_info_kobj, "%s",
+				   alloc_name(space_info->flags));
+	if (ret) {
+		kobject_put(&space_info->kobj);
+		return ret;
+	}
+
+	return 0;
+}
+
 /* when one_device is NULL, it removes all device links */
 
 int btrfs_sysfs_rm_device_link(struct btrfs_fs_devices *fs_devices,

fs/btrfs/sysfs.h

@@ -96,5 +96,7 @@ void __cold btrfs_exit_sysfs(void);
 int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info);
 void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info);
 void btrfs_sysfs_add_block_group_type(struct btrfs_block_group_cache *cache);
+int btrfs_sysfs_add_space_info_type(struct btrfs_fs_info *fs_info,
+				    struct btrfs_space_info *space_info);
 
 #endif