diff --git a/kernel/fs/ext2.c b/kernel/fs/ext2.c
index 9df2943..3fc8ae1 100644
--- a/kernel/fs/ext2.c
+++ b/kernel/fs/ext2.c
@@ -299,9 +299,37 @@ u32_t	ext2_alloc_inode(vfs_mount_t *mount)
 	ext2_super_block_t *super = mount->super;
 	if (!super->s_free_inodes_count)
 		return 0;		// no free inodes
-	
+	int bg;
+	for (bg = 0; bg < super->s_blocks_count; b++)
+	{
+		ext2_group_desc_t group_desc = ext2_get_group_desc(mount, b);
+		if (group_desc.bg_free_inodes_count)
+		{
+			u32_t node = ext2_reserve_node(super, group_desc.bg_inode_bitmap, super->s_inodes_per_group);
+			return b * 
+		}
+	}
+	return 0;
 }
 
+u32_t	ext2_reserve_node(ext2_super_block_t *super, u32_t bitmap_block_num, u32_t max_node)
+{
+	u32_t *bitmap = kmalloc(1024 << super->s_log_block_size);
+	int block, max_block = max_node / (8192 << super->s_log_block_size);
+	for (block = 0; block < max_block; block++)
+	{
+		block_read(super->major, super->minor, ext2_FSToDiskBlock(bitmap_block_num + block, super),
+			2 << super->s_log_block_size, bitmap);
+	}
+	kfree(bitmap);
+}
+
+
+int	ext2_num_block_groups(ext2_super_block_t *super)
+{
+}
+
+
 /***************** VFS INTERFACE FUNCTIONS *******************/
 
 
diff --git a/kernel/fs/ext2.h b/kernel/fs/ext2.h
index c91d9cc..1b72e4c 100644
--- a/kernel/fs/ext2.h
+++ b/kernel/fs/ext2.h
@@ -192,6 +192,8 @@ int	ext2_inode_seek(vfs_mount_t *mount, ext2_open_inode_t *open_inode, u32_t blo
 int	ext2_inode_status(vfs_mount_t *mount, u32_t inode_number);
 int	ext2_block_status(vfs_mount_t *mount, u32_t block_number);
 u32_t	ext2_alloc_inode(vfs_mount_t *mount);
+u32_t	ext2_reserve_node(ext2_super_block_t *super, u32_t bitmap_block_num, u32_t max_node);
+int	ext2_num_block_groups(ext2_super_block_t *super);
 
 
 ext2_open_dir_t *ext2_open_dir(vfs_mount_t *mount, u32_t inode_number);