Index: uspace/lib/ext4/include/ext4/superblock.h
===================================================================
--- uspace/lib/ext4/include/ext4/superblock.h	(revision 91fc2dae15616d58352348782bb0b784ca33f418)
+++ uspace/lib/ext4/include/ext4/superblock.h	(revision 9c4df2136d978f44d78151ee519a3de3c8e56567)
@@ -147,4 +147,5 @@
 extern void ext4_superblock_set_reserved_gdt_blocks(ext4_superblock_t *sb,
     uint32_t n);
+extern uint32_t ext4_superblock_get_flex_group_size(ext4_superblock_t *sb);
 
 /* More complex superblock functions */