Index: uspace/lib/ext4/libext4_directory.h
===================================================================
--- uspace/lib/ext4/libext4_directory.h	(revision 1a7756aac9f32a31fd86cec80050dcb77f240b90)
+++ uspace/lib/ext4/libext4_directory.h	(revision 12f552207db9b0ddb3dbefce8346fd46011fbe95)
@@ -37,5 +37,5 @@
 #include "libext4_inode.h"
 
-#define EXT4_FILENAME_LEN	255
+#define EXT4_DIRECTORY_FILENAME_LEN	255
 
 /**
@@ -50,5 +50,5 @@
 		uint8_t inode_type; // Type of referenced inode (in rev >= 0.5)
 	} __attribute__ ((packed));
-	uint8_t name[EXT4_FILENAME_LEN]; // Entry name
+	uint8_t name[EXT4_DIRECTORY_FILENAME_LEN]; // Entry name
 } __attribute__ ((packed)) ext4_directory_entry_ll_t;
 
@@ -60,4 +60,39 @@
 	ext4_directory_entry_ll_t *current;
 } ext4_directory_iterator_t;
+
+
+/* Structures for indexed directory */
+
+typedef struct ext4_directory_dx_dot_entry {
+	uint32_t inode;
+	uint16_t entry_length;
+    uint8_t name_length;
+    uint8_t inode_type;
+    uint8_t name[4];
+} ext4_directory_dx_dot_entry_t;
+
+typedef struct ext4_directory_dx_root_info {
+	uint32_t reserved_zero;
+	uint8_t hash_version;
+	uint8_t info_length;
+	uint8_t indirect_levels;
+	uint8_t unused_flags;
+} ext4_directory_dx_root_info_t;
+
+typedef struct ext4_directory_dx_entry {
+	uint32_t hash;
+	uint32_t block;
+} ext4_directory_dx_entry_t;
+
+typedef struct ext4_directory_dx_root {
+		ext4_directory_dx_dot_entry_t dots[2];
+		// TODO insert root info items instead of special datatype
+		ext4_directory_dx_root_info_t info;
+		ext4_directory_dx_entry_t *entries;
+} ext4_directory_dx_root_t;
+
+
+#define EXT4_DIRECTORY_HTREE_EOF  0x7fffffff
+
 
 extern uint32_t	ext4_directory_entry_ll_get_inode(ext4_directory_entry_ll_t *);