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diff --git a/include/ext4_extent.h b/include/ext4_extent.h
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+/*
+ * Copyright (c) 2013 Grzegorz Kostka (kostka.grzegorz@gmail.com)
+ *
+ *
+ * HelenOS:
+ * Copyright (c) 2012 Martin Sucha
+ * Copyright (c) 2012 Frantisek Princ
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup lwext4
+ * @{
+ */
+/**
+ * @file  ext4_extent.h
+ * @brief More complex filesystem functions.
+ */
+#ifndef EXT4_EXTENT_H_
+#define EXT4_EXTENT_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "ext4_config.h"
+#include "ext4_types.h"
+#include "ext4_inode.h"
+
+
+/**@brief Get logical number of the block covered by extent.
+ * @param extent Extent to load number from
+ * @return Logical number of the first block covered by extent */
+static inline uint32_t ext4_extent_get_first_block(struct ext4_extent *extent)
+{
+	return to_le32(extent->first_block);
+}
+
+/**@brief Set logical number of the first block covered by extent.
+ * @param extent Extent to set number to
+ * @param iblock Logical number of the first block covered by extent */
+static inline void ext4_extent_set_first_block(struct ext4_extent *extent,
+		uint32_t iblock)
+{
+	extent->first_block = to_le32(iblock);
+}
+
+/**@brief Get number of blocks covered by extent.
+ * @param extent Extent to load count from
+ * @return Number of blocks covered by extent */
+static inline uint16_t ext4_extent_get_block_count(struct ext4_extent *extent)
+{
+	if (EXT4_EXT_IS_UNWRITTEN(extent))
+		return EXT4_EXT_GET_LEN_UNWRITTEN(extent);
+	else
+		return EXT4_EXT_GET_LEN(extent);
+}
+/**@brief Set number of blocks covered by extent.
+ * @param extent Extent to load count from
+ * @param count  Number of blocks covered by extent
+ * @param unwritten Whether the extent is unwritten or not */
+static inline void ext4_extent_set_block_count(struct ext4_extent *extent,
+					       uint16_t count, bool unwritten)
+{
+	EXT4_EXT_SET_LEN(extent, count);
+	if (unwritten)
+		EXT4_EXT_SET_UNWRITTEN(extent);
+}
+
+/**@brief Get physical number of the first block covered by extent.
+ * @param extent Extent to load number
+ * @return Physical number of the first block covered by extent */
+static inline uint64_t ext4_extent_get_start(struct ext4_extent *extent)
+{
+	return ((uint64_t)to_le16(extent->start_hi)) << 32 |
+	       ((uint64_t)to_le32(extent->start_lo));
+}
+
+
+/**@brief Set physical number of the first block covered by extent.
+ * @param extent Extent to load number
+ * @param fblock Physical number of the first block covered by extent */
+static inline void ext4_extent_set_start(struct ext4_extent *extent, uint64_t fblock)
+{
+	extent->start_lo = to_le32((fblock << 32) >> 32);
+	extent->start_hi = to_le16((uint16_t)(fblock >> 32));
+}
+
+
+/**@brief Get logical number of the block covered by extent index.
+ * @param index Extent index to load number from
+ * @return Logical number of the first block covered by extent index */
+static inline uint32_t
+ext4_extent_index_get_first_block(struct ext4_extent_index *index)
+{
+	return to_le32(index->first_block);
+}
+
+/**@brief Set logical number of the block covered by extent index.
+ * @param index  Extent index to set number to
+ * @param iblock Logical number of the first block covered by extent index */
+static inline void
+ext4_extent_index_set_first_block(struct ext4_extent_index *index,
+				  uint32_t iblock)
+{
+	index->first_block = to_le32(iblock);
+}
+
+/**@brief Get physical number of block where the child node is located.
+ * @param index Extent index to load number from
+ * @return Physical number of the block with child node */
+static inline uint64_t
+ext4_extent_index_get_leaf(struct ext4_extent_index *index)
+{
+	return ((uint64_t)to_le16(index->leaf_hi)) << 32 |
+	       ((uint64_t)to_le32(index->leaf_lo));
+}
+
+/**@brief Set physical number of block where the child node is located.
+ * @param index  Extent index to set number to
+ * @param fblock Ohysical number of the block with child node */
+static inline void ext4_extent_index_set_leaf(struct ext4_extent_index *index,
+					      uint64_t fblock)
+{
+	index->leaf_lo = to_le32((fblock << 32) >> 32);
+	index->leaf_hi = to_le16((uint16_t)(fblock >> 32));
+}
+
+/**@brief Get magic value from extent header.
+ * @param header Extent header to load value from
+ * @return Magic value of extent header */
+static inline uint16_t
+ext4_extent_header_get_magic(struct ext4_extent_header *header)
+{
+	return to_le16(header->magic);
+}
+
+/**@brief Set magic value to extent header.
+ * @param header Extent header to set value to
+ * @param magic  Magic value of extent header */
+static inline void ext4_extent_header_set_magic(struct ext4_extent_header *header,
+						uint16_t magic)
+{
+	header->magic = to_le16(magic);
+}
+
+/**@brief Get number of entries from extent header
+ * @param header Extent header to get value from
+ * @return Number of entries covered by extent header */
+static inline uint16_t
+ext4_extent_header_get_entries_count(struct ext4_extent_header *header)
+{
+	return to_le16(header->entries_count);
+}
+
+/**@brief Set number of entries to extent header
+ * @param header Extent header to set value to
+ * @param count  Number of entries covered by extent header */
+static inline void
+ext4_extent_header_set_entries_count(struct ext4_extent_header *header,
+				     uint16_t count)
+{
+	header->entries_count = to_le16(count);
+}
+
+/**@brief Get maximum number of entries from extent header
+ * @param header Extent header to get value from
+ * @return Maximum number of entries covered by extent header */
+static inline uint16_t
+ext4_extent_header_get_max_entries_count(struct ext4_extent_header *header)
+{
+	return to_le16(header->max_entries_count);
+}
+
+/**@brief Set maximum number of entries to extent header
+ * @param header    Extent header to set value to
+ * @param max_count Maximum number of entries covered by extent header */
+static inline void
+ext4_extent_header_set_max_entries_count(struct ext4_extent_header *header,
+					      uint16_t max_count)
+{
+	header->max_entries_count = to_le16(max_count);
+}
+
+/**@brief Get depth of extent subtree.
+ * @param header Extent header to get value from
+ * @return Depth of extent subtree */
+static inline uint16_t
+ext4_extent_header_get_depth(struct ext4_extent_header *header)
+{
+	return to_le16(header->depth);
+}
+
+/**@brief Set depth of extent subtree.
+ * @param header Extent header to set value to
+ * @param depth  Depth of extent subtree */
+static inline void
+ext4_extent_header_set_depth(struct ext4_extent_header *header, uint16_t depth)
+{
+	header->depth = to_le16(depth);
+}
+
+/**@brief Get generation from extent header
+ * @param header Extent header to get value from
+ * @return Generation */
+static inline uint32_t
+ext4_extent_header_get_generation(struct ext4_extent_header *header)
+{
+	return to_le32(header->generation);
+}
+
+/**@brief Set generation to extent header
+ * @param header     Extent header to set value to
+ * @param generation Generation */
+static inline void
+ext4_extent_header_set_generation(struct ext4_extent_header *header,
+				       uint32_t generation)
+{
+	header->generation = to_le32(generation);
+}
+
+/******************************************************************************/
+
+/**TODO:  */
+static inline void ext4_extent_tree_init(struct ext4_inode_ref *inode_ref)
+{
+	/* Initialize extent root header */
+	struct ext4_extent_header *header =
+			ext4_inode_get_extent_header(inode_ref->inode);
+	ext4_extent_header_set_depth(header, 0);
+	ext4_extent_header_set_entries_count(header, 0);
+	ext4_extent_header_set_generation(header, 0);
+	ext4_extent_header_set_magic(header, EXT4_EXTENT_MAGIC);
+
+	uint16_t max_entries = (EXT4_INODE_BLOCKS * sizeof(uint32_t) -
+			sizeof(struct ext4_extent_header)) /
+					sizeof(struct ext4_extent);
+
+	ext4_extent_header_set_max_entries_count(header, max_entries);
+	inode_ref->dirty  = true;
+}
+
+
+
+/**TODO:  */
+int ext4_extent_get_blocks(struct ext4_inode_ref *inode_ref, ext4_lblk_t iblock,
+			   uint32_t max_blocks, ext4_fsblk_t *result, bool create,
+			   uint32_t *blocks_count);
+
+
+/**@brief Release all data blocks starting from specified logical block.
+ * @param inode_ref   I-node to release blocks from
+ * @param iblock_from First logical block to release
+ * @return Error code */
+int ext4_extent_remove_space(struct ext4_inode_ref *inode_ref, ext4_lblk_t from,
+			     ext4_lblk_t to);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* EXT4_EXTENT_H_ */
+/**
+* @}
+*/