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diff --git a/include/ext4_blockdev.h b/include/ext4_blockdev.h
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+/*
+ * Copyright (c) 2013 Grzegorz Kostka (kostka.grzegorz@gmail.com)
+ * 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_blockdev.h
+ * @brief Block device module.
+ */
+
+#ifndef EXT4_BLOCKDEV_H_
+#define EXT4_BLOCKDEV_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "ext4_config.h"
+#include "ext4_bcache.h"
+#include "ext4_trans.h"
+#include "ext4_debug.h"
+
+#include <stdbool.h>
+#include <stdint.h>
+
+struct ext4_blockdev_iface {
+	/**@brief   Open device function
+	 * @param   bdev block device.*/
+	int (*open)(struct ext4_blockdev *bdev);
+
+	/**@brief   Block read function.
+	 * @param   bdev block device
+	 * @param   buf output buffer
+	 * @param   blk_id block id
+	 * @param   blk_cnt block count*/
+	int (*bread)(struct ext4_blockdev *bdev, void *buf, uint64_t blk_id,
+		     uint32_t blk_cnt);
+
+	/**@brief   Block write function.
+	 * @param   buf input buffer
+	 * @param   blk_id block id
+	 * @param   blk_cnt block count*/
+	int (*bwrite)(struct ext4_blockdev *bdev, const void *buf,
+		      uint64_t blk_id, uint32_t blk_cnt);
+
+	/**@brief   Close device function.
+	 * @param   bdev block device.*/
+	int (*close)(struct ext4_blockdev *bdev);
+
+	/**@brief   Lock block device. Required in multi partition mode
+	 *          operations. Not mandatory field.
+	 * @param   bdev block device.*/
+	int (*lock)(struct ext4_blockdev *bdev);
+
+	/**@brief   Unlock block device. Required in multi partition mode
+	 *          operations. Not mandatory field.
+	 * @param   bdev block device.*/
+	int (*unlock)(struct ext4_blockdev *bdev);
+
+	/**@brief   Block size (bytes): physical*/
+	uint32_t ph_bsize;
+
+	/**@brief   Block count: physical*/
+	uint64_t ph_bcnt;
+
+	/**@brief   Block size buffer: physical*/
+	uint8_t *ph_bbuf;
+
+	/**@brief   Reference counter to block device interface*/
+	uint32_t ph_refctr;
+
+	/**@brief   Physical read counter*/
+	uint32_t bread_ctr;
+
+	/**@brief   Physical write counter*/
+	uint32_t bwrite_ctr;
+};
+
+/**@brief   Definition of the simple block device.*/
+struct ext4_blockdev {
+	/**@brief Block device interface*/
+	struct ext4_blockdev_iface *bdif;
+
+	/**@brief Offset in bdif. For multi partition mode.*/
+	uint64_t part_offset;
+
+	/**@brief Part size in bdif. For multi partition mode.*/
+	uint64_t part_size;
+
+	/**@brief   Block cache.*/
+	struct ext4_bcache *bc;
+
+	/**@brief   Block size (bytes) logical*/
+	uint32_t lg_bsize;
+
+	/**@brief   Block count: logical*/
+	uint64_t lg_bcnt;
+
+	/**@brief   Cache write back mode reference counter*/
+	uint32_t cache_write_back;
+
+	/**@brief   The filesystem this block device belongs to. */
+	struct ext4_fs *fs;
+};
+
+/**@brief   Static initialization of the block device.*/
+#define EXT4_BLOCKDEV_STATIC_INSTANCE(__name, __bsize, __bcnt, __open, __bread,\
+				      __bwrite, __close, __lock, __unlock)     \
+	static uint8_t __name##_ph_bbuf[(__bsize)];                            \
+	static struct ext4_blockdev_iface __name##_iface = {                   \
+		.open = __open,                                                \
+		.bread = __bread,                                              \
+		.bwrite = __bwrite,                                            \
+		.close = __close,                                              \
+		.lock = __lock,                                                \
+		.unlock = __unlock,                                            \
+		.ph_bsize = __bsize,                                           \
+		.ph_bcnt = __bcnt,                                             \
+		.ph_bbuf = __name##_ph_bbuf,                                   \
+	};								       \
+	static struct ext4_blockdev __name = {                                 \
+		.bdif = &__name##_iface,                                       \
+		.part_offset = 0,                                              \
+		.part_size =  (__bcnt) * (__bsize),                            \
+	}
+
+/**@brief   Block device initialization.
+ * @param   bdev block device descriptor
+ * @param   bg_bsize logical block size
+ * @param   bdev block device descriptor
+ * @return  standard error code*/
+int ext4_block_init(struct ext4_blockdev *bdev);
+
+/**@brief   Binds a bcache to block device.
+ * @param   bdev block device descriptor
+ * @param   bc block cache descriptor
+ * @return  standard error code*/
+int ext4_block_bind_bcache(struct ext4_blockdev *bdev, struct ext4_bcache *bc);
+
+/**@brief   Close block device
+ * @param   bdev block device descriptor
+ * @return  standard error code*/
+int ext4_block_fini(struct ext4_blockdev *bdev);
+
+/**@brief   Flush data in given buffer to disk.
+ * @param   bdev block device descriptor
+ * @param   buf buffer
+ * @return  standard error code*/
+int ext4_block_flush_buf(struct ext4_blockdev *bdev, struct ext4_buf *buf);
+
+/**@brief   Flush data in buffer of given lba to disk,
+ *          if that buffer exists in block cache.
+ * @param   bdev block device descriptor
+ * @param   lba logical block address
+ * @return  standard error code*/
+int ext4_block_flush_lba(struct ext4_blockdev *bdev, uint64_t lba);
+
+/**@brief   Set logical block size in block device.
+ * @param   bdev block device descriptor
+ * @param   lb_size logical block size (in bytes)
+ * @return  standard error code*/
+void ext4_block_set_lb_size(struct ext4_blockdev *bdev, uint64_t lb_bsize);
+
+/**@brief   Block get function (through cache, don't read).
+ * @param   bdev block device descriptor
+ * @param   b block descriptor
+ * @param   lba logical block address
+ * @return  standard error code*/
+int ext4_block_get_noread(struct ext4_blockdev *bdev, struct ext4_block *b,
+			  uint64_t lba);
+
+/**@brief   Block get function (through cache).
+ * @param   bdev block device descriptor
+ * @param   b block descriptor
+ * @param   lba logical block address
+ * @return  standard error code*/
+int ext4_block_get(struct ext4_blockdev *bdev, struct ext4_block *b,
+		   uint64_t lba);
+
+/**@brief   Block set procedure (through cache).
+ * @param   bdev block device descriptor
+ * @param   b block descriptor
+ * @return  standard error code*/
+int ext4_block_set(struct ext4_blockdev *bdev, struct ext4_block *b);
+
+/**@brief   Block read procedure (without cache)
+ * @param   bdev block device descriptor
+ * @param   buf output buffer
+ * @param   lba logical block address
+ * @return  standard error code*/
+int ext4_blocks_get_direct(struct ext4_blockdev *bdev, void *buf, uint64_t lba,
+			   uint32_t cnt);
+
+/**@brief   Block write procedure (without cache)
+ * @param   bdev block device descriptor
+ * @param   buf output buffer
+ * @param   lba logical block address
+ * @return  standard error code*/
+int ext4_blocks_set_direct(struct ext4_blockdev *bdev, const void *buf,
+			   uint64_t lba, uint32_t cnt);
+
+/**@brief   Write to block device (by direct address).
+ * @param   bdev block device descriptor
+ * @param   off byte offset in block device
+ * @param   buf input buffer
+ * @param   len length of the write buffer
+ * @return  standard error code*/
+int ext4_block_writebytes(struct ext4_blockdev *bdev, uint64_t off,
+			  const void *buf, uint32_t len);
+
+/**@brief   Read freom block device (by direct address).
+ * @param   bdev block device descriptor
+ * @param   off byte offset in block device
+ * @param   buf input buffer
+ * @param   len length of the write buffer
+ * @return  standard error code*/
+int ext4_block_readbytes(struct ext4_blockdev *bdev, uint64_t off, void *buf,
+			 uint32_t len);
+
+/**@brief   Flush all dirty buffers to disk
+ * @param   bdev block device descriptor
+ * @return  standard error code*/
+int ext4_block_cache_flush(struct ext4_blockdev *bdev);
+
+/**@brief   Enable/disable write back cache mode
+ * @param   bdev block device descriptor
+ * @param   on_off
+ *              !0 - ENABLE
+ *               0 - DISABLE (all delayed cache buffers will be flushed)
+ * @return  standard error code*/
+int ext4_block_cache_write_back(struct ext4_blockdev *bdev, uint8_t on_off);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* EXT4_BLOCKDEV_H_ */
+
+/**
+ * @}
+ */