Index: uspace/lib/ext4/include/ext4/cfg.h
===================================================================
--- uspace/lib/ext4/include/ext4/cfg.h	(revision b209135fccd9282dabef632255a0a7e0b536ab6c)
+++ uspace/lib/ext4/include/ext4/cfg.h	(revision 4aba58199ef9ede50ac743fd32a73eeb465dc4e2)
@@ -34,4 +34,6 @@
 #define LIBEXT4_CFG_H_
 
+#include "types.h"
+
 /** Versions available to choose from when creating a new file system. */
 typedef enum {
@@ -45,4 +47,12 @@
 #define ext4_def_fs_version extver_ext2
 
+/** Configuration of a new ext4 file system */
+typedef struct {
+	/** File system version */
+	ext4_cfg_ver_t version;
+	/** Volume name encoded as UTF-8 string */
+	const char *volume_name;
+} ext4_cfg_t;
+
 #endif
 
Index: uspace/lib/ext4/include/ext4/filesystem.h
===================================================================
--- uspace/lib/ext4/include/ext4/filesystem.h	(revision b209135fccd9282dabef632255a0a7e0b536ab6c)
+++ uspace/lib/ext4/include/ext4/filesystem.h	(revision 4aba58199ef9ede50ac743fd32a73eeb465dc4e2)
@@ -42,5 +42,5 @@
 
 extern errno_t ext4_filesystem_probe(service_id_t, ext4_fs_probe_info_t *);
-extern errno_t ext4_filesystem_create(ext4_cfg_ver_t, service_id_t);
+extern errno_t ext4_filesystem_create(ext4_cfg_t *, service_id_t);
 extern errno_t ext4_filesystem_open(ext4_instance_t *, service_id_t,
     enum cache_mode, aoff64_t *, ext4_filesystem_t **);
Index: uspace/lib/ext4/include/ext4/superblock.h
===================================================================
--- uspace/lib/ext4/include/ext4/superblock.h	(revision b209135fccd9282dabef632255a0a7e0b536ab6c)
+++ uspace/lib/ext4/include/ext4/superblock.h	(revision 4aba58199ef9ede50ac743fd32a73eeb465dc4e2)
@@ -120,5 +120,5 @@
 extern errno_t ext4_superblock_get_volume_name(ext4_superblock_t *, char *,
     size_t);
-extern void ext4_superblock_set_volume_name(ext4_superblock_t *, const char *);
+extern errno_t ext4_superblock_set_volume_name(ext4_superblock_t *, const char *);
 extern const char *ext4_superblock_get_last_mounted(ext4_superblock_t *);
 extern void ext4_superblock_set_last_mounted(ext4_superblock_t *, const char *);
@@ -166,5 +166,5 @@
 extern uint32_t ext4_superblock_get_inodes_in_group(ext4_superblock_t *,
     uint32_t);
-extern errno_t ext4_superblock_create(size_t, uint64_t, ext4_cfg_ver_t,
+extern errno_t ext4_superblock_create(size_t, uint64_t, ext4_cfg_t *,
     ext4_superblock_t **);
 extern uint32_t ext4_superblock_get_group_backup_blocks(ext4_superblock_t *,
Index: uspace/lib/ext4/include/ext4/types.h
===================================================================
--- uspace/lib/ext4/include/ext4/types.h	(revision b209135fccd9282dabef632255a0a7e0b536ab6c)
+++ uspace/lib/ext4/include/ext4/types.h	(revision 4aba58199ef9ede50ac743fd32a73eeb465dc4e2)
@@ -235,9 +235,11 @@
 } ext4_filesystem_t;
 
+/** Size of buffer for volume name. To hold 16 latin-1 chars encoded as UTF-8
+ * and a null terminator we need 2 * 16 + 1 bytes
+ */
+#define EXT4_VOL_NAME_BYTES 33
+
 typedef struct {
-	/** Volume name, to hold 16 latin-1 chars in UTF-8 and null terminator
-	 * we need 2 * 16 + 1 bytes
-	 */
-	char vol_name[33];
+	char vol_name[EXT4_VOL_NAME_BYTES];
 } ext4_fs_probe_info_t;