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diff --git a/include/ext4_debug.h b/include/ext4_debug.h
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+++ b/include/ext4_debug.h
@@ -0,0 +1,189 @@
+/*
+ * 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_debug.c
+ * @brief Debug printf and assert macros.
+ */
+
+#ifndef EXT4_DEBUG_H_
+#define EXT4_DEBUG_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "ext4_config.h"
+#include "ext4_errno.h"
+
+#if !CONFIG_HAVE_OWN_ASSERT
+#include <assert.h>
+#endif
+
+#include <stdint.h>
+#include <stdio.h>
+#include <inttypes.h>
+
+#ifndef PRIu64
+#define PRIu64 "llu"
+#endif
+
+#ifndef PRId64
+#define PRId64 "lld"
+#endif
+
+
+#define DEBUG_BALLOC (1ul << 0)
+#define DEBUG_BCACHE (1ul << 1)
+#define DEBUG_BITMAP (1ul << 2)
+#define DEBUG_BLOCK_GROUP (1ul << 3)
+#define DEBUG_BLOCKDEV (1ul << 4)
+#define DEBUG_DIR_IDX (1ul << 5)
+#define DEBUG_DIR (1ul << 6)
+#define DEBUG_EXTENT (1ul << 7)
+#define DEBUG_FS (1ul << 8)
+#define DEBUG_HASH (1ul << 9)
+#define DEBUG_IALLOC (1ul << 10)
+#define DEBUG_INODE (1ul << 11)
+#define DEBUG_SUPER (1ul << 12)
+#define DEBUG_XATTR (1ul << 13)
+#define DEBUG_MKFS (1ul << 14)
+#define DEBUG_EXT4 (1ul << 15)
+#define DEBUG_JBD (1ul << 16)
+#define DEBUG_MBR (1ul << 17)
+
+#define DEBUG_NOPREFIX (1ul << 31)
+#define DEBUG_ALL (0xFFFFFFFF)
+
+static inline const char *ext4_dmask_id2str(uint32_t m)
+{
+	switch(m) {
+	case DEBUG_BALLOC:
+		return "ext4_balloc: ";
+	case DEBUG_BCACHE:
+		return "ext4_bcache: ";
+	case DEBUG_BITMAP:
+		return "ext4_bitmap: ";
+	case DEBUG_BLOCK_GROUP:
+		return "ext4_block_group: ";
+	case DEBUG_BLOCKDEV:
+		return "ext4_blockdev: ";
+	case DEBUG_DIR_IDX:
+		return "ext4_dir_idx: ";
+	case DEBUG_DIR:
+		return "ext4_dir: ";
+	case DEBUG_EXTENT:
+		return "ext4_extent: ";
+	case DEBUG_FS:
+		return "ext4_fs: ";
+	case DEBUG_HASH:
+		return "ext4_hash: ";
+	case DEBUG_IALLOC:
+		return "ext4_ialloc: ";
+	case DEBUG_INODE:
+		return "ext4_inode: ";
+	case DEBUG_SUPER:
+		return "ext4_super: ";
+	case DEBUG_XATTR:
+		return "ext4_xattr: ";
+	case DEBUG_MKFS:
+		return "ext4_mkfs: ";
+	case DEBUG_JBD:
+		return "ext4_jbd: ";
+	case DEBUG_MBR:
+		return "ext4_mbr: ";
+	case DEBUG_EXT4:
+		return "ext4: ";
+	}
+	return "";
+}
+#define DBG_NONE  ""
+#define DBG_INFO  "[info]  "
+#define DBG_WARN  "[warn]  "
+#define DBG_ERROR "[error] "
+
+/**@brief   Global mask debug set.
+ * @brief   m new debug mask.*/
+void ext4_dmask_set(uint32_t m);
+
+/**@brief   Global mask debug clear.
+ * @brief   m new debug mask.*/
+void ext4_dmask_clr(uint32_t m);
+
+/**@brief   Global debug mask get.
+ * @return  debug mask*/
+uint32_t ext4_dmask_get(void);
+
+#if CONFIG_DEBUG_PRINTF
+/**@brief   Debug printf.*/
+#define ext4_dbg(m, ...)                                                       \
+	do {                                                                   \
+		if ((m) & ext4_dmask_get()) {                                  \
+			if (!((m) & DEBUG_NOPREFIX)) {                         \
+				printf("%s", ext4_dmask_id2str(m));            \
+				printf("l: %d   ", __LINE__);                  \
+			}                                                      \
+			printf(__VA_ARGS__);                                   \
+			fflush(stdout);                                        \
+		}                                                              \
+	} while (0)
+#else
+#define ext4_dbg(m, ...) do { } while (0)
+#endif
+
+#if CONFIG_DEBUG_ASSERT
+/**@brief   Debug assertion.*/
+#if CONFIG_HAVE_OWN_ASSERT
+#define ext4_assert(_v)                                                        \
+	do {                                                                   \
+		if (!(_v)) {                                                   \
+			printf("assertion failed:\nfile: %s\nline: %d\n",      \
+			       __FILE__, __LINE__);                            \
+			       while (1)				       \
+				       ;				       \
+		}                                                              \
+	} while (0)
+#else
+#define ext4_assert(_v) assert(_v)
+#endif
+#else
+#define ext4_assert(_v) ((void)(_v))
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* EXT4_DEBUG_H_ */
+
+/**
+ * @}
+ */