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diff --git a/include/ext4_balloc.h b/include/ext4_balloc.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_balloc.h
+ * @brief Physical block allocator.
+ */
+
+#ifndef EXT4_BALLOC_H_
+#define EXT4_BALLOC_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "ext4_config.h"
+#include "ext4_types.h"
+
+#include <stdint.h>
+#include <stdbool.h>
+
+/**@brief Compute number of block group from block address.
+ * @param sb superblock pointer.
+ * @param baddr Absolute address of block.
+ * @return Block group index
+ */
+uint32_t ext4_balloc_get_bgid_of_block(struct ext4_sblock *s,
+				       ext4_fsblk_t baddr);
+
+/**@brief Compute the starting block address of a block group
+ * @param sb   superblock pointer.
+ * @param bgid block group index
+ * @return Block address
+ */
+ext4_fsblk_t ext4_balloc_get_block_of_bgid(struct ext4_sblock *s,
+					   uint32_t bgid);
+
+/**@brief Calculate and set checksum of block bitmap.
+ * @param sb superblock pointer.
+ * @param bg block group
+ * @param bitmap bitmap buffer
+ */
+void ext4_balloc_set_bitmap_csum(struct ext4_sblock *sb,
+				 struct ext4_bgroup *bg,
+				 void *bitmap);
+
+/**@brief   Free block from inode.
+ * @param   inode_ref inode reference
+ * @param   baddr block address
+ * @return  standard error code*/
+int ext4_balloc_free_block(struct ext4_inode_ref *inode_ref,
+			   ext4_fsblk_t baddr);
+
+/**@brief   Free blocks from inode.
+ * @param   inode_ref inode reference
+ * @param   first block address
+ * @param   count block count
+ * @return  standard error code*/
+int ext4_balloc_free_blocks(struct ext4_inode_ref *inode_ref,
+			    ext4_fsblk_t first, uint32_t count);
+
+/**@brief   Allocate block procedure.
+ * @param   inode_ref inode reference
+ * @param   goal
+ * @param   baddr allocated block address
+ * @return  standard error code*/
+int ext4_balloc_alloc_block(struct ext4_inode_ref *inode_ref,
+			    ext4_fsblk_t goal,
+			    ext4_fsblk_t *baddr);
+
+/**@brief   Try allocate selected block.
+ * @param   inode_ref inode reference
+ * @param   baddr block address to allocate
+ * @param   free if baddr is not allocated
+ * @return  standard error code*/
+int ext4_balloc_try_alloc_block(struct ext4_inode_ref *inode_ref,
+				ext4_fsblk_t baddr, bool *free);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* EXT4_BALLOC_H_ */
+
+/**
+ * @}
+ */