Reconstruct source directory tree.

1 files changed, 2935 insertions, 0 deletions

diff --git a/src/ext4.c b/src/ext4.c
new file mode 100644
index 0000000..38ec6d4
--- /dev/null
+++ b/src/ext4.c
@@ -0,0 +1,2935 @@
+/*
+ * 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.h
+ * @brief Ext4 high level operations (file, directory, mountpoints...)
+ */
+
+#include "ext4_config.h"
+#include "ext4.h"
+#include "ext4_blockdev.h"
+#include "ext4_types.h"
+#include "ext4_debug.h"
+#include "ext4_errno.h"
+#include "ext4_fs.h"
+#include "ext4_dir.h"
+#include "ext4_inode.h"
+#include "ext4_super.h"
+#include "ext4_dir_idx.h"
+#include "ext4_xattr.h"
+#include "ext4_journal.h"
+
+
+#include <stdlib.h>
+#include <string.h>
+
+/**@brief   Mount point OS dependent lock*/
+#define EXT4_MP_LOCK(_m)                                                       \
+	do {                                                                   \
+		if ((_m)->os_locks)                                            \
+			(_m)->os_locks->lock();                                \
+	} while (0)
+
+/**@brief   Mount point OS dependent unlock*/
+#define EXT4_MP_UNLOCK(_m)                                                     \
+	do {                                                                   \
+		if ((_m)->os_locks)                                            \
+			(_m)->os_locks->unlock();                              \
+	} while (0)
+
+/**@brief   Mount point descriptor.*/
+struct ext4_mountpoint {
+
+	/**@brief   Mount done flag.*/
+	bool mounted;
+
+	/**@brief   Mount point name (@ref ext4_mount)*/
+	char name[32];
+
+	/**@brief   OS dependent lock/unlock functions.*/
+	const struct ext4_lock *os_locks;
+
+	/**@brief   Ext4 filesystem internals.*/
+	struct ext4_fs fs;
+
+	/**@brief   Dynamic allocation cache flag.*/
+	bool cache_dynamic;
+
+	struct jbd_fs jbd_fs;
+	struct jbd_journal jbd_journal;
+};
+
+/**@brief   Block devices descriptor.*/
+struct _ext4_devices {
+
+	/**@brief   Block device name (@ref ext4_device_register)*/
+	char name[32];
+
+	/**@brief   Block device handle.*/
+	struct ext4_blockdev *bd;
+
+	/**@brief   Block cache handle.*/
+	struct ext4_bcache *bc;
+};
+
+/**@brief   Block devices.*/
+struct _ext4_devices _bdevices[CONFIG_EXT4_BLOCKDEVS_COUNT];
+
+/**@brief   Mountpoints.*/
+struct ext4_mountpoint _mp[CONFIG_EXT4_MOUNTPOINTS_COUNT];
+
+int ext4_device_register(struct ext4_blockdev *bd, struct ext4_bcache *bc,
+			 const char *dev_name)
+{
+	uint32_t i;
+	ext4_assert(bd && dev_name);
+
+	for (i = 0; i < CONFIG_EXT4_BLOCKDEVS_COUNT; ++i) {
+		if (!_bdevices[i].bd) {
+			strcpy(_bdevices[i].name, dev_name);
+			_bdevices[i].bd = bd;
+			_bdevices[i].bc = bc;
+			return EOK;
+		}
+
+		if (!strcmp(_bdevices[i].name, dev_name))
+			return EOK;
+	}
+	return ENOSPC;
+}
+
+/****************************************************************************/
+
+static bool ext4_is_dots(const uint8_t *name, size_t name_size)
+{
+	if ((name_size == 1) && (name[0] == '.'))
+		return true;
+
+	if ((name_size == 2) && (name[0] == '.') && (name[1] == '.'))
+		return true;
+
+	return false;
+}
+
+static int ext4_has_children(bool *has_children, struct ext4_inode_ref *enode)
+{
+	struct ext4_sblock *sb = &enode->fs->sb;
+
+	/* Check if node is directory */
+	if (!ext4_inode_is_type(sb, enode->inode, EXT4_INODE_MODE_DIRECTORY)) {
+		*has_children = false;
+		return EOK;
+	}
+
+	struct ext4_dir_iter it;
+	int rc = ext4_dir_iterator_init(&it, enode, 0);
+	if (rc != EOK)
+		return rc;
+
+	/* Find a non-empty directory entry */
+	bool found = false;
+	while (it.curr != NULL) {
+		if (ext4_dir_en_get_inode(it.curr) != 0) {
+			uint16_t nsize;
+			nsize = ext4_dir_en_get_name_len(sb, it.curr);
+			if (!ext4_is_dots(it.curr->name, nsize)) {
+				found = true;
+				break;
+			}
+		}
+
+		rc = ext4_dir_iterator_next(&it);
+		if (rc != EOK) {
+			ext4_dir_iterator_fini(&it);
+			return rc;
+		}
+	}
+
+	rc = ext4_dir_iterator_fini(&it);
+	if (rc != EOK)
+		return rc;
+
+	*has_children = found;
+
+	return EOK;
+}
+
+static int ext4_link(struct ext4_mountpoint *mp, struct ext4_inode_ref *parent,
+		     struct ext4_inode_ref *ch, const char *n,
+		     uint32_t len, bool rename)
+{
+	/* Check maximum name length */
+	if (len > EXT4_DIRECTORY_FILENAME_LEN)
+		return EINVAL;
+
+	/* Add entry to parent directory */
+	int r = ext4_dir_add_entry(parent, n, len, ch);
+	if (r != EOK)
+		return r;
+
+	/* Fill new dir -> add '.' and '..' entries.
+	 * Also newly allocated inode should have 0 link count.
+	 */
+
+	bool is_dir = ext4_inode_is_type(&mp->fs.sb, ch->inode,
+			       EXT4_INODE_MODE_DIRECTORY);
+	if (is_dir && !rename) {
+
+#if CONFIG_DIR_INDEX_ENABLE
+		/* Initialize directory index if supported */
+		if (ext4_sb_feature_com(&mp->fs.sb, EXT4_FCOM_DIR_INDEX)) {
+			r = ext4_dir_dx_init(ch, parent);
+			if (r != EOK)
+				return r;
+
+			ext4_inode_set_flag(ch->inode, EXT4_INODE_FLAG_INDEX);
+			ch->dirty = true;
+		} else
+#endif
+		{
+			r = ext4_dir_add_entry(ch, ".", strlen("."), ch);
+			if (r != EOK) {
+				ext4_dir_remove_entry(parent, n, strlen(n));
+				return r;
+			}
+
+			r = ext4_dir_add_entry(ch, "..", strlen(".."), parent);
+			if (r != EOK) {
+				ext4_dir_remove_entry(parent, n, strlen(n));
+				ext4_dir_remove_entry(ch, ".", strlen("."));
+				return r;
+			}
+		}
+
+		/*New empty directory. Two links (. and ..) */
+		ext4_inode_set_links_cnt(ch->inode, 2);
+		ext4_fs_inode_links_count_inc(parent);
+		ch->dirty = true;
+		parent->dirty = true;
+		return r;
+	}
+	/*
+	 * In case we want to rename a directory,
+	 * we reset the original '..' pointer.
+	 */
+	if (is_dir) {
+		bool idx;
+		idx = ext4_inode_has_flag(ch->inode, EXT4_INODE_FLAG_INDEX);
+		struct ext4_dir_search_result res;
+		if (!idx) {
+			r = ext4_dir_find_entry(&res, ch, "..", strlen(".."));
+			if (r != EOK)
+				return EIO;
+
+			ext4_dir_en_set_inode(res.dentry, parent->index);
+			ext4_trans_set_block_dirty(res.block.buf);
+			r = ext4_dir_destroy_result(ch, &res);
+			if (r != EOK)
+				return r;
+
+		} else {
+#if CONFIG_DIR_INDEX_ENABLE
+			r = ext4_dir_dx_reset_parent_inode(ch, parent->index);
+			if (r != EOK)
+				return r;
+
+#endif
+		}
+
+		ext4_fs_inode_links_count_inc(parent);
+		parent->dirty = true;
+	}
+	if (!rename) {
+		ext4_fs_inode_links_count_inc(ch);
+		ch->dirty = true;
+	}
+
+	return r;
+}
+
+static int ext4_unlink(struct ext4_mountpoint *mp,
+		       struct ext4_inode_ref *parent,
+		       struct ext4_inode_ref *child, const char *name,
+		       uint32_t name_len)
+{
+	bool has_children;
+	int rc = ext4_has_children(&has_children, child);
+	if (rc != EOK)
+		return rc;
+
+	/* Cannot unlink non-empty node */
+	if (has_children)
+		return ENOTEMPTY;
+
+	/* Remove entry from parent directory */
+	rc = ext4_dir_remove_entry(parent, name, name_len);
+	if (rc != EOK)
+		return rc;
+
+	bool is_dir = ext4_inode_is_type(&mp->fs.sb, child->inode,
+					 EXT4_INODE_MODE_DIRECTORY);
+
+	/* If directory - handle links from parent */
+	if (is_dir) {
+		ext4_fs_inode_links_count_dec(parent);
+		parent->dirty = true;
+	}
+
+	/*
+	 * TODO: Update timestamps of the parent
+	 * (when we have wall-clock time).
+	 *
+	 * ext4_inode_set_change_inode_time(parent->inode, (uint32_t) now);
+	 * ext4_inode_set_modification_time(parent->inode, (uint32_t) now);
+	 * parent->dirty = true;
+	 */
+
+	/*
+	 * TODO: Update timestamp for inode.
+	 *
+	 * ext4_inode_set_change_inode_time(child->inode,
+	 *     (uint32_t) now);
+	 */
+	if (ext4_inode_get_links_cnt(child->inode)) {
+		ext4_fs_inode_links_count_dec(child);
+		child->dirty = true;
+	}
+
+	return EOK;
+}
+
+/****************************************************************************/
+
+int ext4_mount(const char *dev_name, const char *mount_point)
+{
+	ext4_assert(mount_point && dev_name);
+	int r;
+	int i;
+
+	uint32_t bsize;
+	struct ext4_blockdev *bd = 0;
+	struct ext4_bcache *bc = 0;
+	struct ext4_mountpoint *mp = 0;
+
+	if (mount_point[strlen(mount_point) - 1] != '/')
+		return ENOTSUP;
+
+	for (i = 0; i < CONFIG_EXT4_BLOCKDEVS_COUNT; ++i) {
+		if (_bdevices[i].name) {
+			if (!strcmp(dev_name, _bdevices[i].name)) {
+				bd = _bdevices[i].bd;
+				bc = _bdevices[i].bc;
+				break;
+			}
+		}
+	}
+
+	if (!bd)
+		return ENODEV;
+
+	for (i = 0; i < CONFIG_EXT4_MOUNTPOINTS_COUNT; ++i) {
+		if (!_mp[i].mounted) {
+			strcpy(_mp[i].name, mount_point);
+			_mp[i].mounted = 1;
+			mp = &_mp[i];
+			break;
+		}
+
+		if (!strcmp(_mp[i].name, mount_point))
+			return EOK;
+	}
+
+	if (!mp)
+		return ENOMEM;
+
+	r = ext4_block_init(bd);
+	if (r != EOK)
+		return r;
+
+	r = ext4_fs_init(&mp->fs, bd);
+	if (r != EOK) {
+		ext4_block_fini(bd);
+		return r;
+	}
+
+	bsize = ext4_sb_get_block_size(&mp->fs.sb);
+	ext4_block_set_lb_size(bd, bsize);
+
+	mp->cache_dynamic = 0;
+
+	if (!bc) {
+		/*Automatic block cache alloc.*/
+		mp->cache_dynamic = 1;
+		bc = malloc(sizeof(struct ext4_bcache));
+
+		r = ext4_bcache_init_dynamic(bc, CONFIG_BLOCK_DEV_CACHE_SIZE,
+					     bsize);
+		if (r != EOK) {
+			free(bc);
+			ext4_block_fini(bd);
+			return r;
+		}
+	}
+
+	if (bsize != bc->itemsize)
+		return ENOTSUP;
+
+	/*Bind block cache to block device*/
+	r = ext4_block_bind_bcache(bd, bc);
+	if (r != EOK) {
+		ext4_bcache_cleanup(bc);
+		ext4_block_fini(bd);
+		if (mp->cache_dynamic) {
+			ext4_bcache_fini_dynamic(bc);
+			free(bc);
+		}
+		return r;
+	}
+	bd->fs = &mp->fs;
+
+	return r;
+}
+
+
+int ext4_umount(const char *mount_point)
+{
+	int i;
+	int r;
+	struct ext4_mountpoint *mp = 0;
+
+	for (i = 0; i < CONFIG_EXT4_MOUNTPOINTS_COUNT; ++i) {
+		if (!strcmp(_mp[i].name, mount_point)) {
+			mp = &_mp[i];
+			break;
+		}
+	}
+
+	if (!mp)
+		return ENODEV;
+
+	r = ext4_fs_fini(&mp->fs);
+	if (r != EOK)
+		goto Finish;
+
+	mp->mounted = 0;
+
+	ext4_bcache_cleanup(mp->fs.bdev->bc);
+	if (mp->cache_dynamic) {
+		ext4_bcache_fini_dynamic(mp->fs.bdev->bc);
+		free(mp->fs.bdev->bc);
+	}
+	r = ext4_block_fini(mp->fs.bdev);
+Finish:
+	mp->fs.bdev->fs = NULL;
+	return r;
+}
+
+static struct ext4_mountpoint *ext4_get_mount(const char *path)
+{
+	int i;
+	for (i = 0; i < CONFIG_EXT4_MOUNTPOINTS_COUNT; ++i) {
+
+		if (!_mp[i].mounted)
+			continue;
+
+		if (!strncmp(_mp[i].name, path, strlen(_mp[i].name)))
+			return &_mp[i];
+	}
+	return NULL;
+}
+
+__unused
+static int __ext4_journal_start(const char *mount_point)
+{
+	int r = EOK;
+	struct ext4_mountpoint *mp = ext4_get_mount(mount_point);
+	if (!mp)
+		return ENOENT;
+
+	if (ext4_sb_feature_com(&mp->fs.sb,
+				EXT4_FCOM_HAS_JOURNAL)) {
+		r = jbd_get_fs(&mp->fs, &mp->jbd_fs);
+		if (r != EOK)
+			goto Finish;
+
+		r = jbd_journal_start(&mp->jbd_fs, &mp->jbd_journal);
+		if (r != EOK) {
+			mp->jbd_fs.dirty = false;
+			jbd_put_fs(&mp->jbd_fs);
+			goto Finish;
+		}
+		mp->fs.jbd_fs = &mp->jbd_fs;
+		mp->fs.jbd_journal = &mp->jbd_journal;
+	}
+Finish:
+	return r;
+}
+
+__unused
+static int __ext4_journal_stop(const char *mount_point)
+{
+	int r = EOK;
+	struct ext4_mountpoint *mp = ext4_get_mount(mount_point);
+	if (!mp)
+		return ENOENT;
+
+	if (ext4_sb_feature_com(&mp->fs.sb,
+				EXT4_FCOM_HAS_JOURNAL)) {
+		r = jbd_journal_stop(&mp->jbd_journal);
+		if (r != EOK) {
+			mp->jbd_fs.dirty = false;
+			jbd_put_fs(&mp->jbd_fs);
+			mp->fs.jbd_journal = NULL;
+			mp->fs.jbd_fs = NULL;
+			goto Finish;
+		}
+
+		r = jbd_put_fs(&mp->jbd_fs);
+		if (r != EOK) {
+			mp->fs.jbd_journal = NULL;
+			mp->fs.jbd_fs = NULL;
+			goto Finish;
+		}
+
+		mp->fs.jbd_journal = NULL;
+		mp->fs.jbd_fs = NULL;
+	}
+Finish:
+	return r;
+}
+
+__unused
+static int __ext4_recover(const char *mount_point)
+{
+	struct ext4_mountpoint *mp = ext4_get_mount(mount_point);
+	if (!mp)
+		return ENOENT;
+
+	int r = ENOTSUP;
+	EXT4_MP_LOCK(mp);
+	if (ext4_sb_feature_com(&mp->fs.sb, EXT4_FCOM_HAS_JOURNAL)) {
+		struct jbd_fs *jbd_fs = calloc(1, sizeof(struct jbd_fs));
+		if (!jbd_fs) {
+			 r = ENOMEM;
+			 goto Finish;
+		}
+
+
+		r = jbd_get_fs(&mp->fs, jbd_fs);
+		if (r != EOK) {
+			free(jbd_fs);
+			goto Finish;
+		}
+
+		r = jbd_recover(jbd_fs);
+		jbd_put_fs(jbd_fs);
+		free(jbd_fs);
+	}
+
+
+Finish:
+	EXT4_MP_UNLOCK(mp);
+	return r;
+}
+
+__unused
+static int __ext4_trans_start(struct ext4_mountpoint *mp)
+{
+	int r = EOK;
+	if (mp->fs.jbd_journal && !mp->fs.curr_trans) {
+		struct jbd_journal *journal = mp->fs.jbd_journal;
+		struct jbd_trans *trans;
+		trans = jbd_journal_new_trans(journal);
+		if (!trans) {
+			r = ENOMEM;
+			goto Finish;
+		}
+		mp->fs.curr_trans = trans;
+	}
+Finish:
+	return r;
+}
+
+__unused
+static int __ext4_trans_stop(struct ext4_mountpoint *mp)
+{
+	int r = EOK;
+	if (mp->fs.jbd_journal && mp->fs.curr_trans) {
+		struct jbd_journal *journal = mp->fs.jbd_journal;
+		struct jbd_trans *trans = mp->fs.curr_trans;
+		r = jbd_journal_commit_trans(journal, trans);
+		mp->fs.curr_trans = NULL;
+	}
+	return r;
+}
+
+__unused
+static void __ext4_trans_abort(struct ext4_mountpoint *mp)
+{
+	if (mp->fs.jbd_journal && mp->fs.curr_trans) {
+		struct jbd_journal *journal = mp->fs.jbd_journal;
+		struct jbd_trans *trans = mp->fs.curr_trans;
+		jbd_journal_free_trans(journal, trans, true);
+		mp->fs.curr_trans = NULL;
+	}
+}
+
+int ext4_journal_start(const char *mount_point __unused)
+{
+	int r = EOK;
+#if CONFIG_JOURNALING_ENABLE
+	r = __ext4_journal_start(mount_point);
+#endif
+	return r;
+}
+
+int ext4_journal_stop(const char *mount_point __unused)
+{
+	int r = EOK;
+#if CONFIG_JOURNALING_ENABLE
+	r = __ext4_journal_stop(mount_point);
+#endif
+	return r;
+}
+
+int ext4_recover(const char *mount_point __unused)
+{
+	int r = EOK;
+#if CONFIG_JOURNALING_ENABLE
+	r = __ext4_recover(mount_point);
+#endif
+	return r;
+}
+
+static int ext4_trans_start(struct ext4_mountpoint *mp __unused)
+{
+	int r = EOK;
+#if CONFIG_JOURNALING_ENABLE
+	r = __ext4_trans_start(mp);
+#endif
+	return r;
+}
+
+static int ext4_trans_stop(struct ext4_mountpoint *mp __unused)
+{
+	int r = EOK;
+#if CONFIG_JOURNALING_ENABLE
+	r = __ext4_trans_stop(mp);
+#endif
+	return r;
+}
+
+static void ext4_trans_abort(struct ext4_mountpoint *mp __unused)
+{
+#if CONFIG_JOURNALING_ENABLE
+	__ext4_trans_abort(mp);
+#endif
+}
+
+
+int ext4_mount_point_stats(const char *mount_point,
+			   struct ext4_mount_stats *stats)
+{
+	struct ext4_mountpoint *mp = ext4_get_mount(mount_point);
+
+	if (!mp)
+		return ENOENT;
+
+	EXT4_MP_LOCK(mp);
+	stats->inodes_count = ext4_get32(&mp->fs.sb, inodes_count);
+	stats->free_inodes_count = ext4_get32(&mp->fs.sb, free_inodes_count);
+	stats->blocks_count = ext4_sb_get_blocks_cnt(&mp->fs.sb);
+	stats->free_blocks_count = ext4_sb_get_free_blocks_cnt(&mp->fs.sb);
+	stats->block_size = ext4_sb_get_block_size(&mp->fs.sb);
+
+	stats->block_group_count = ext4_block_group_cnt(&mp->fs.sb);
+	stats->blocks_per_group = ext4_get32(&mp->fs.sb, blocks_per_group);
+	stats->inodes_per_group = ext4_get32(&mp->fs.sb, inodes_per_group);
+
+	memcpy(stats->volume_name, mp->fs.sb.volume_name, 16);
+	EXT4_MP_UNLOCK(mp);
+
+	return EOK;
+}
+
+int ext4_mount_setup_locks(const char *mount_point,
+			   const struct ext4_lock *locks)
+{
+	uint32_t i;
+	struct ext4_mountpoint *mp = 0;
+
+	for (i = 0; i < CONFIG_EXT4_MOUNTPOINTS_COUNT; ++i) {
+		if (!strcmp(_mp[i].name, mount_point)) {
+			mp = &_mp[i];
+			break;
+		}
+	}
+	if (!mp)
+		return ENOENT;
+
+	mp->os_locks = locks;
+	return EOK;
+}
+
+/********************************FILE OPERATIONS*****************************/
+
+static int ext4_path_check(const char *path, bool *is_goal)
+{
+	int i;
+
+	for (i = 0; i < EXT4_DIRECTORY_FILENAME_LEN; ++i) {
+
+		if (path[i] == '/') {
+			*is_goal = false;
+			return i;
+		}
+
+		if (path[i] == 0) {
+			*is_goal = true;
+			return i;
+		}
+	}
+
+	return 0;
+}
+
+static bool ext4_parse_flags(const char *flags, uint32_t *file_flags)
+{
+	if (!flags)
+		return false;
+
+	if (!strcmp(flags, "r") || !strcmp(flags, "rb")) {
+		*file_flags = O_RDONLY;
+		return true;
+	}
+
+	if (!strcmp(flags, "w") || !strcmp(flags, "wb")) {
+		*file_flags = O_WRONLY | O_CREAT | O_TRUNC;
+		return true;
+	}
+
+	if (!strcmp(flags, "a") || !strcmp(flags, "ab")) {
+		*file_flags = O_WRONLY | O_CREAT | O_APPEND;
+		return true;
+	}
+
+	if (!strcmp(flags, "r+") || !strcmp(flags, "rb+") ||
+	    !strcmp(flags, "r+b")) {
+		*file_flags = O_RDWR;
+		return true;
+	}
+
+	if (!strcmp(flags, "w+") || !strcmp(flags, "wb+") ||
+	    !strcmp(flags, "w+b")) {
+		*file_flags = O_RDWR | O_CREAT | O_TRUNC;
+		return true;
+	}
+
+	if (!strcmp(flags, "a+") || !strcmp(flags, "ab+") ||
+	    !strcmp(flags, "a+b")) {
+		*file_flags = O_RDWR | O_CREAT | O_APPEND;
+		return true;
+	}
+
+	return false;
+}
+
+static int ext4_trunc_inode(struct ext4_mountpoint *mp,
+			    uint32_t index, uint64_t new_size)
+{
+	int r = EOK;
+	struct ext4_fs *const fs = &mp->fs;
+	struct ext4_inode_ref inode_ref;
+	uint64_t inode_size;
+	bool has_trans = mp->fs.jbd_journal && mp->fs.curr_trans;
+	r = ext4_fs_get_inode_ref(fs, index, &inode_ref);
+	if (r != EOK)
+		return r;
+
+	inode_size = ext4_inode_get_size(&fs->sb, inode_ref.inode);
+	ext4_fs_put_inode_ref(&inode_ref);
+	if (has_trans)
+		ext4_trans_stop(mp);
+
+	while (inode_size > new_size + CONFIG_MAX_TRUNCATE_SIZE) {
+
+		inode_size -= CONFIG_MAX_TRUNCATE_SIZE;
+
+		ext4_trans_start(mp);
+		r = ext4_fs_get_inode_ref(fs, index, &inode_ref);
+		if (r != EOK) {
+			ext4_trans_abort(mp);
+			break;
+		}
+		r = ext4_fs_truncate_inode(&inode_ref, inode_size);
+		if (r != EOK)
+			ext4_fs_put_inode_ref(&inode_ref);
+		else
+			r = ext4_fs_put_inode_ref(&inode_ref);
+
+		if (r != EOK) {
+			ext4_trans_abort(mp);
+			goto Finish;
+		} else
+			ext4_trans_stop(mp);
+	}
+
+	if (inode_size > new_size) {
+
+		inode_size = new_size;
+
+		ext4_trans_start(mp);
+		r = ext4_fs_get_inode_ref(fs, index, &inode_ref);
+		if (r != EOK) {
+			ext4_trans_abort(mp);
+			goto Finish;
+		}
+		r = ext4_fs_truncate_inode(&inode_ref, inode_size);
+		if (r != EOK)
+			ext4_fs_put_inode_ref(&inode_ref);
+		else
+			r = ext4_fs_put_inode_ref(&inode_ref);
+
+		if (r != EOK)
+			ext4_trans_abort(mp);
+		else
+			ext4_trans_stop(mp);
+
+	}
+
+Finish:
+
+	if (has_trans)
+		ext4_trans_start(mp);
+
+	return r;
+}
+
+static int ext4_trunc_dir(struct ext4_mountpoint *mp,
+			  struct ext4_inode_ref *parent,
+			  struct ext4_inode_ref *dir)
+{
+	int r = EOK;
+	bool is_dir = ext4_inode_is_type(&mp->fs.sb, dir->inode,
+			EXT4_INODE_MODE_DIRECTORY);
+	uint32_t block_size = ext4_sb_get_block_size(&mp->fs.sb);
+	if (!is_dir)
+		return EINVAL;
+
+#if CONFIG_DIR_INDEX_ENABLE
+	/* Initialize directory index if supported */
+	if (ext4_sb_feature_com(&mp->fs.sb, EXT4_FCOM_DIR_INDEX)) {
+		r = ext4_dir_dx_init(dir, parent);
+		if (r != EOK)
+			return r;
+
+		r = ext4_trunc_inode(mp, dir->index,
+				     EXT4_DIR_DX_INIT_BCNT * block_size);
+		if (r != EOK)
+			return r;
+	} else
+#endif
+	{
+		r = ext4_trunc_inode(mp, dir->index, block_size);
+		if (r != EOK)
+			return r;
+	}
+
+	return ext4_fs_truncate_inode(dir, 0);
+}
+
+/*
+ * NOTICE: if filetype is equal to EXT4_DIRENTRY_UNKNOWN,
+ * any filetype of the target dir entry will be accepted.
+ */
+static int ext4_generic_open2(ext4_file *f, const char *path, int flags,
+			      int ftype, uint32_t *parent_inode,
+			      uint32_t *name_off)
+{
+	bool is_goal = false;
+	uint32_t imode = EXT4_INODE_MODE_DIRECTORY;
+	uint32_t next_inode;
+
+	int r;
+	int len;
+	struct ext4_mountpoint *mp = ext4_get_mount(path);
+	struct ext4_dir_search_result result;
+	struct ext4_inode_ref ref;
+
+	f->mp = 0;
+
+	if (!mp)
+		return ENOENT;
+
+	struct ext4_fs *const fs = &mp->fs;
+	struct ext4_sblock *const sb = &mp->fs.sb;
+
+	f->flags = flags;
+
+	/*Skip mount point*/
+	path += strlen(mp->name);
+
+	if (name_off)
+		*name_off = strlen(mp->name);
+
+	/*Load root*/
+	r = ext4_fs_get_inode_ref(fs, EXT4_INODE_ROOT_INDEX, &ref);
+	if (r != EOK)
+		return r;
+
+	if (parent_inode)
+		*parent_inode = ref.index;
+
+	if (flags & O_CREAT)
+		ext4_trans_start(mp);
+
+	len = ext4_path_check(path, &is_goal);
+	while (1) {
+
+		len = ext4_path_check(path, &is_goal);
+		if (!len) {
+			/*If root open was request.*/
+			if (ftype == EXT4_DE_DIR || ftype == EXT4_DE_UNKNOWN)
+				if (is_goal)
+					break;
+
+			r = ENOENT;
+			break;
+		}
+
+		r = ext4_dir_find_entry(&result, &ref, path, len);
+		if (r != EOK) {
+
+			/*Destroy last result*/
+			ext4_dir_destroy_result(&ref, &result);
+			if (r != ENOENT)
+				break;
+
+			if (!(f->flags & O_CREAT))
+				break;
+
+			/*O_CREAT allows create new entry*/
+			struct ext4_inode_ref child_ref;
+			r = ext4_fs_alloc_inode(fs, &child_ref,
+					is_goal ? ftype : EXT4_DE_DIR);
+			if (r != EOK)
+				break;
+
+
+			/*Link with root dir.*/
+			r = ext4_link(mp, &ref, &child_ref, path, len, false);
+			if (r != EOK) {
+				/*Fail. Free new inode.*/
+				ext4_fs_free_inode(&child_ref);
+				/*We do not want to write new inode.
+				  But block has to be released.*/
+				child_ref.dirty = false;
+				ext4_fs_put_inode_ref(&child_ref);
+				break;
+			}
+
+			ext4_fs_put_inode_ref(&child_ref);
+			continue;
+		}
+
+		if (parent_inode)
+			*parent_inode = ref.index;
+
+		next_inode = ext4_dir_en_get_inode(result.dentry);
+		if (ext4_sb_feature_incom(sb, EXT4_FINCOM_FILETYPE)) {
+			uint8_t t;
+			t = ext4_dir_en_get_inode_type(sb, result.dentry);
+			imode = ext4_fs_correspond_inode_mode(t);
+		} else {
+			struct ext4_inode_ref child_ref;
+			r = ext4_fs_get_inode_ref(fs, next_inode, &child_ref);
+			if (r != EOK)
+				break;
+
+			imode = ext4_inode_type(sb, child_ref.inode);
+			ext4_fs_put_inode_ref(&child_ref);
+		}
+
+		r = ext4_dir_destroy_result(&ref, &result);
+		if (r != EOK)
+			break;
+
+		/*If expected file error*/
+		if (imode != EXT4_INODE_MODE_DIRECTORY && !is_goal) {
+			r = ENOENT;
+			break;
+		}
+		if (ftype != EXT4_DE_UNKNOWN) {
+			bool df = imode != ext4_fs_correspond_inode_mode(ftype);
+			if (df && is_goal) {
+				r = ENOENT;
+				break;
+			}
+		}
+
+		r = ext4_fs_put_inode_ref(&ref);
+		if (r != EOK)
+			break;
+
+		r = ext4_fs_get_inode_ref(fs, next_inode, &ref);
+		if (r != EOK)
+			break;
+
+		if (is_goal)
+			break;
+
+		path += len + 1;
+
+		if (name_off)
+			*name_off += len + 1;
+	};
+
+	if (r != EOK) {
+		ext4_fs_put_inode_ref(&ref);
+		return r;
+	}
+
+	if (is_goal) {
+
+		if ((f->flags & O_TRUNC) && (imode == EXT4_INODE_MODE_FILE)) {
+			r = ext4_trunc_inode(mp, ref.index, 0);
+			if (r != EOK) {
+				ext4_fs_put_inode_ref(&ref);
+				return r;
+			}
+		}
+
+		f->mp = mp;
+		f->fsize = ext4_inode_get_size(sb, ref.inode);
+		f->inode = ref.index;
+		f->fpos = 0;
+
+		if (f->flags & O_APPEND)
+			f->fpos = f->fsize;
+
+	}
+
+	r = ext4_fs_put_inode_ref(&ref);
+	if (flags & O_CREAT) {
+		if (r == EOK)
+			ext4_trans_stop(mp);
+		else
+			ext4_trans_abort(mp);
+
+	}
+
+	return r;
+}
+
+/****************************************************************************/
+
+static int ext4_generic_open(ext4_file *f, const char *path, const char *flags,
+			     bool file_expect, uint32_t *parent_inode,
+			     uint32_t *name_off)
+{
+	uint32_t iflags;
+	int filetype;
+	if (ext4_parse_flags(flags, &iflags) == false)
+		return EINVAL;
+
+	if (file_expect == true)
+		filetype = EXT4_DE_REG_FILE;
+	else
+		filetype = EXT4_DE_DIR;
+
+	return ext4_generic_open2(f, path, iflags, filetype, parent_inode,
+				  name_off);
+}
+
+static int ext4_create_hardlink(const char *path,
+		struct ext4_inode_ref *child_ref, bool rename)
+{
+	bool is_goal = false;
+	uint32_t inode_mode = EXT4_INODE_MODE_DIRECTORY;
+	uint32_t next_inode;
+
+	int r;
+	int len;
+	struct ext4_mountpoint *mp = ext4_get_mount(path);
+	struct ext4_dir_search_result result;
+	struct ext4_inode_ref ref;
+
+	if (!mp)
+		return ENOENT;
+
+	struct ext4_fs *const fs = &mp->fs;
+	struct ext4_sblock *const sb = &mp->fs.sb;
+
+	/*Skip mount point*/
+	path += strlen(mp->name);
+
+	/*Load root*/
+	r = ext4_fs_get_inode_ref(fs, EXT4_INODE_ROOT_INDEX, &ref);
+	if (r != EOK)
+		return r;
+
+	len = ext4_path_check(path, &is_goal);
+	while (1) {
+
+		len = ext4_path_check(path, &is_goal);
+		if (!len) {
+			/*If root open was request.*/
+			r = is_goal ? EINVAL : ENOENT;
+			break;
+		}
+
+		r = ext4_dir_find_entry(&result, &ref, path, len);
+		if (r != EOK) {
+
+			/*Destroy last result*/
+			ext4_dir_destroy_result(&ref, &result);
+
+			if (r != ENOENT || !is_goal)
+				break;
+
+			/*Link with root dir.*/
+			r = ext4_link(mp, &ref, child_ref, path, len, rename);
+			break;
+		} else if (r == EOK && is_goal) {
+			/*Destroy last result*/
+			ext4_dir_destroy_result(&ref, &result);
+			r = EEXIST;
+			break;
+		}
+
+		next_inode = result.dentry->inode;
+		if (ext4_sb_feature_incom(sb, EXT4_FINCOM_FILETYPE)) {
+			uint8_t t;
+			t = ext4_dir_en_get_inode_type(sb, result.dentry);
+			inode_mode = ext4_fs_correspond_inode_mode(t);
+		} else {
+			struct ext4_inode_ref child_ref;
+			r = ext4_fs_get_inode_ref(fs, next_inode, &child_ref);
+			if (r != EOK)
+				break;
+
+			inode_mode = ext4_inode_type(sb, child_ref.inode);
+			ext4_fs_put_inode_ref(&child_ref);
+		}
+
+		r = ext4_dir_destroy_result(&ref, &result);
+		if (r != EOK)
+			break;
+
+		if (inode_mode != EXT4_INODE_MODE_DIRECTORY) {
+			r = is_goal ? EEXIST : ENOENT;
+			break;
+		}
+
+		r = ext4_fs_put_inode_ref(&ref);
+		if (r != EOK)
+			break;
+
+		r = ext4_fs_get_inode_ref(fs, next_inode, &ref);
+		if (r != EOK)
+			break;
+
+		if (is_goal)
+			break;
+
+		path += len + 1;
+	};
+
+	if (r != EOK) {
+		ext4_fs_put_inode_ref(&ref);
+		return r;
+	}
+
+	r = ext4_fs_put_inode_ref(&ref);
+	return r;
+}
+
+static int ext4_remove_orig_reference(const char *path, uint32_t name_off,
+				      struct ext4_inode_ref *parent_ref,
+				      struct ext4_inode_ref *child_ref)
+{
+	bool is_goal;
+	int r;
+	int len;
+	struct ext4_mountpoint *mp = ext4_get_mount(path);
+
+	if (!mp)
+		return ENOENT;
+
+	/*Set path*/
+	path += name_off;
+
+	len = ext4_path_check(path, &is_goal);
+
+	/* Remove entry from parent directory */
+	r = ext4_dir_remove_entry(parent_ref, path, len);
+	if (r != EOK)
+		goto Finish;
+
+	if (ext4_inode_is_type(&mp->fs.sb, child_ref->inode,
+			       EXT4_INODE_MODE_DIRECTORY)) {
+		ext4_fs_inode_links_count_dec(parent_ref);
+		parent_ref->dirty = true;
+	}
+Finish:
+	return r;
+}
+
+int ext4_flink(const char *path, const char *hardlink_path)
+{
+	int r;
+	ext4_file f;
+	uint32_t name_off;
+	bool child_loaded = false;
+	uint32_t parent_inode, child_inode;
+	struct ext4_mountpoint *mp = ext4_get_mount(path);
+	struct ext4_mountpoint *target_mp = ext4_get_mount(hardlink_path);
+	struct ext4_inode_ref child_ref;
+
+	if (!mp)
+		return ENOENT;
+
+	/* Will that happen? Anyway return EINVAL for such case. */
+	if (mp != target_mp)
+		return EINVAL;
+
+	EXT4_MP_LOCK(mp);
+	ext4_trans_start(mp);
+
+	r = ext4_generic_open2(&f, path, O_RDONLY, EXT4_DE_UNKNOWN,
+			       &parent_inode, &name_off);
+	if (r != EOK)
+		goto Finish;
+
+	child_inode = f.inode;
+	ext4_fclose(&f);
+
+	/*We have file to unlink. Load it.*/
+	r = ext4_fs_get_inode_ref(&mp->fs, child_inode, &child_ref);
+	if (r != EOK)
+		goto Finish;
+
+	child_loaded = true;
+
+	/* Creating hardlink for directory is not allowed. */
+	if (ext4_inode_is_type(&mp->fs.sb, child_ref.inode,
+			       EXT4_INODE_MODE_DIRECTORY)) {
+		r = EINVAL;
+		goto Finish;
+	}
+
+	r = ext4_create_hardlink(hardlink_path, &child_ref, false);
+
+Finish:
+	if (child_loaded)
+		ext4_fs_put_inode_ref(&child_ref);
+
+	if (r != EOK)
+		ext4_trans_abort(mp);
+	else
+		ext4_trans_stop(mp);
+
+	EXT4_MP_UNLOCK(mp);
+	return r;
+
+}
+
+int ext4_frename(const char *path, const char *new_path)
+{
+	int r;
+	ext4_file f;
+	uint32_t name_off;
+	bool parent_loaded = false, child_loaded = false;
+	uint32_t parent_inode, child_inode;
+	struct ext4_mountpoint *mp = ext4_get_mount(path);
+	struct ext4_inode_ref child_ref, parent_ref;
+
+	if (!mp)
+		return ENOENT;
+
+	EXT4_MP_LOCK(mp);
+	ext4_trans_start(mp);
+
+	r = ext4_generic_open2(&f, path, O_RDONLY, EXT4_DE_UNKNOWN,
+				&parent_inode, &name_off);
+	if (r != EOK)
+		goto Finish;
+
+	child_inode = f.inode;
+	ext4_fclose(&f);
+
+	/*Load parent*/
+	r = ext4_fs_get_inode_ref(&mp->fs, parent_inode, &parent_ref);
+	if (r != EOK)
+		goto Finish;
+
+	parent_loaded = true;
+
+	/*We have file to unlink. Load it.*/
+	r = ext4_fs_get_inode_ref(&mp->fs, child_inode, &child_ref);
+	if (r != EOK)
+		goto Finish;
+
+	child_loaded = true;
+
+	r = ext4_create_hardlink(new_path, &child_ref, true);
+	if (r != EOK)
+		goto Finish;
+
+	r = ext4_remove_orig_reference(path, name_off, &parent_ref, &child_ref);
+	if (r != EOK)
+		goto Finish;
+
+Finish:
+	if (parent_loaded)
+		ext4_fs_put_inode_ref(&parent_ref);
+
+	if (child_loaded)
+		ext4_fs_put_inode_ref(&child_ref);
+
+	if (r != EOK)
+		ext4_trans_abort(mp);
+	else
+		ext4_trans_stop(mp);
+
+	EXT4_MP_UNLOCK(mp);
+	return r;
+
+}
+
+/****************************************************************************/
+
+int ext4_get_sblock(const char *mount_point, struct ext4_sblock **sb)
+{
+	struct ext4_mountpoint *mp = ext4_get_mount(mount_point);
+
+	if (!mp)
+		return ENOENT;
+
+	*sb = &mp->fs.sb;
+	return EOK;
+}
+
+int ext4_cache_write_back(const char *path, bool on)
+{
+	struct ext4_mountpoint *mp = ext4_get_mount(path);
+
+	if (!mp)
+		return ENOENT;
+
+	EXT4_MP_LOCK(mp);
+	ext4_block_cache_write_back(mp->fs.bdev, on);
+	EXT4_MP_UNLOCK(mp);
+	return EOK;
+}
+
+int ext4_fremove(const char *path)
+{
+	ext4_file f;
+	uint32_t parent_inode;
+	uint32_t name_off;
+	bool is_goal;
+	int r;
+	int len;
+	struct ext4_inode_ref child;
+	struct ext4_inode_ref parent;
+	struct ext4_mountpoint *mp = ext4_get_mount(path);
+
+	if (!mp)
+		return ENOENT;
+
+	EXT4_MP_LOCK(mp);
+	ext4_trans_start(mp);
+
+	r = ext4_generic_open2(&f, path, O_RDWR, EXT4_DE_UNKNOWN,
+			       &parent_inode, &name_off);
+	if (r != EOK) {
+		ext4_trans_abort(mp);
+		EXT4_MP_UNLOCK(mp);
+		return r;
+	}
+
+	/*Load parent*/
+	r = ext4_fs_get_inode_ref(&mp->fs, parent_inode, &parent);
+	if (r != EOK) {
+		ext4_trans_abort(mp);
+		EXT4_MP_UNLOCK(mp);
+		return r;
+	}
+
+	/*We have file to delete. Load it.*/
+	r = ext4_fs_get_inode_ref(&mp->fs, f.inode, &child);
+	if (r != EOK) {
+		ext4_fs_put_inode_ref(&parent);
+		ext4_trans_abort(mp);
+		EXT4_MP_UNLOCK(mp);
+		return r;
+	}
+	/* We do not allow opening files here. */
+	if (ext4_inode_type(&mp->fs.sb, child.inode) ==
+	    EXT4_INODE_MODE_DIRECTORY) {
+		ext4_fs_put_inode_ref(&parent);
+		ext4_fs_put_inode_ref(&child);
+		ext4_trans_abort(mp);
+		EXT4_MP_UNLOCK(mp);
+		return r;
+	}
+
+	/*Link count will be zero, the inode should be freed. */
+	if (ext4_inode_get_links_cnt(child.inode) == 1) {
+		ext4_block_cache_write_back(mp->fs.bdev, 1);
+		r = ext4_trunc_inode(mp, child.index, 0);
+		if (r != EOK) {
+			ext4_fs_put_inode_ref(&parent);
+			ext4_fs_put_inode_ref(&child);
+			ext4_trans_abort(mp);
+			EXT4_MP_UNLOCK(mp);
+			return r;
+		}
+		ext4_block_cache_write_back(mp->fs.bdev, 0);
+	}
+
+	/*Set path*/
+	path += name_off;
+
+	len = ext4_path_check(path, &is_goal);
+
+	/*Unlink from parent*/
+	r = ext4_unlink(mp, &parent, &child, path, len);
+	if (r != EOK)
+		goto Finish;
+
+	/*Link count is zero, the inode should be freed. */
+	if (!ext4_inode_get_links_cnt(child.inode)) {
+		ext4_inode_set_del_time(child.inode, -1L);
+
+		r = ext4_fs_free_inode(&child);
+		if (r != EOK)
+			goto Finish;
+	}
+
+Finish:
+	ext4_fs_put_inode_ref(&child);
+	ext4_fs_put_inode_ref(&parent);
+
+	if (r != EOK)
+		ext4_trans_abort(mp);
+	else
+		ext4_trans_stop(mp);
+
+	EXT4_MP_UNLOCK(mp);
+	return r;
+}
+
+int ext4_fill_raw_inode(const char *path, uint32_t *ret_ino,
+			struct ext4_inode *inode)
+{
+	int r;
+	ext4_file f;
+	struct ext4_inode_ref inode_ref;
+	struct ext4_mountpoint *mp = ext4_get_mount(path);
+	uint32_t ino;
+
+	if (!mp)
+		return ENOENT;
+
+	EXT4_MP_LOCK(mp);
+
+	r = ext4_generic_open2(&f, path, O_RDONLY, EXT4_DE_UNKNOWN, NULL, NULL);
+	if (r != EOK) {
+		EXT4_MP_UNLOCK(mp);
+		return r;
+	}
+
+	ino = f.inode;
+	ext4_fclose(&f);
+
+	/*Load parent*/
+	r = ext4_fs_get_inode_ref(&mp->fs, ino, &inode_ref);
+	if (r != EOK) {
+		EXT4_MP_UNLOCK(mp);
+		return r;
+	}
+
+	memcpy(inode, inode_ref.inode, sizeof(struct ext4_inode));
+	ext4_fs_put_inode_ref(&inode_ref);
+	EXT4_MP_UNLOCK(mp);
+
+	if (ret_ino)
+		*ret_ino = ino;
+
+	return r;
+}
+
+int ext4_fopen(ext4_file *f, const char *path, const char *flags)
+{
+	struct ext4_mountpoint *mp = ext4_get_mount(path);
+	int r;
+
+	if (!mp)
+		return ENOENT;
+
+	EXT4_MP_LOCK(mp);
+
+	ext4_block_cache_write_back(mp->fs.bdev, 1);
+	r = ext4_generic_open(f, path, flags, true, 0, 0);
+	ext4_block_cache_write_back(mp->fs.bdev, 0);
+
+	EXT4_MP_UNLOCK(mp);
+	return r;
+}
+
+int ext4_fopen2(ext4_file *f, const char *path, int flags)
+{
+	struct ext4_mountpoint *mp = ext4_get_mount(path);
+	int r;
+	int filetype;
+
+	if (!mp)
+		return ENOENT;
+
+        filetype = EXT4_DE_REG_FILE;
+
+	EXT4_MP_LOCK(mp);
+
+	ext4_block_cache_write_back(mp->fs.bdev, 1);
+	r = ext4_generic_open2(f, path, flags, filetype, NULL, NULL);
+	ext4_block_cache_write_back(mp->fs.bdev, 0);
+
+	EXT4_MP_UNLOCK(mp);
+	return r;
+}
+
+int ext4_fclose(ext4_file *f)
+{
+	ext4_assert(f && f->mp);
+
+	f->mp = 0;
+	f->flags = 0;
+	f->inode = 0;
+	f->fpos = f->fsize = 0;
+
+	return EOK;
+}
+
+static int ext4_ftruncate_no_lock(ext4_file *f, uint64_t size)
+{
+	struct ext4_inode_ref ref;
+	int r;
+
+
+	r = ext4_fs_get_inode_ref(&f->mp->fs, f->inode, &ref);
+	if (r != EOK) {
+		EXT4_MP_UNLOCK(f->mp);
+		return r;
+	}
+
+	/*Sync file size*/
+	f->fsize = ext4_inode_get_size(&f->mp->fs.sb, ref.inode);
+	if (f->fsize <= size) {
+		r = EOK;
+		goto Finish;
+	}
+
+	/*Start write back cache mode.*/
+	r = ext4_block_cache_write_back(f->mp->fs.bdev, 1);
+	if (r != EOK)
+		goto Finish;
+
+	r = ext4_trunc_inode(f->mp, ref.index, size);
+	if (r != EOK)
+		goto Finish;
+
+	f->fsize = size;
+	if (f->fpos > size)
+		f->fpos = size;
+
+	/*Stop write back cache mode*/
+	ext4_block_cache_write_back(f->mp->fs.bdev, 0);
+
+	if (r != EOK)
+		goto Finish;
+
+Finish:
+	ext4_fs_put_inode_ref(&ref);
+	return r;
+
+}
+
+int ext4_ftruncate(ext4_file *f, uint64_t size)
+{
+	int r;
+	ext4_assert(f && f->mp);
+
+	if (f->flags & O_RDONLY)
+		return EPERM;
+
+	EXT4_MP_LOCK(f->mp);
+
+	ext4_trans_start(f->mp);
+	r = ext4_ftruncate_no_lock(f, size);
+	if (r != EOK)
+		ext4_trans_abort(f->mp);
+	else
+		ext4_trans_stop(f->mp);
+
+	EXT4_MP_UNLOCK(f->mp);
+	return r;
+}
+
+int ext4_fread(ext4_file *f, void *buf, size_t size, size_t *rcnt)
+{
+	uint32_t unalg;
+	uint32_t iblock_idx;
+	uint32_t iblock_last;
+	uint32_t block_size;
+
+	ext4_fsblk_t fblock;
+	ext4_fsblk_t fblock_start;
+	uint32_t fblock_count;
+
+	uint8_t *u8_buf = buf;
+	int r;
+	struct ext4_inode_ref ref;
+
+	ext4_assert(f && f->mp);
+
+	if (f->flags & O_WRONLY)
+		return EPERM;
+
+	if (!size)
+		return EOK;
+
+	EXT4_MP_LOCK(f->mp);
+
+	struct ext4_fs *const fs = &f->mp->fs;
+	struct ext4_sblock *const sb = &f->mp->fs.sb;
+
+	if (rcnt)
+		*rcnt = 0;
+
+	r = ext4_fs_get_inode_ref(fs, f->inode, &ref);
+	if (r != EOK) {
+		EXT4_MP_UNLOCK(f->mp);
+		return r;
+	}
+
+	/*Sync file size*/
+	f->fsize = ext4_inode_get_size(sb, ref.inode);
+
+	block_size = ext4_sb_get_block_size(sb);
+	size = ((uint64_t)size > (f->fsize - f->fpos))
+		? ((size_t)(f->fsize - f->fpos)) : size;
+
+	iblock_idx = (uint32_t)((f->fpos) / block_size);
+	iblock_last = (uint32_t)((f->fpos + size) / block_size);
+	unalg = (f->fpos) % block_size;
+
+	/*If the size of symlink is smaller than 60 bytes*/
+	bool softlink;
+	softlink = ext4_inode_is_type(sb, ref.inode, EXT4_INODE_MODE_SOFTLINK);
+	if (softlink && f->fsize < sizeof(ref.inode->blocks)
+		     && !ext4_inode_get_blocks_count(sb, ref.inode)) {
+
+		char *content = (char *)ref.inode->blocks;
+		if (f->fpos < f->fsize) {
+			size_t len = size;
+			if (unalg + size > (uint32_t)f->fsize)
+				len = (uint32_t)f->fsize - unalg;
+			memcpy(buf, content + unalg, len);
+			if (rcnt)
+				*rcnt = len;
+
+		}
+
+		r = EOK;
+		goto Finish;
+	}
+
+	if (unalg) {
+		size_t len =  size;
+		if (size > (block_size - unalg))
+			len = block_size - unalg;
+
+		r = ext4_fs_get_inode_dblk_idx(&ref, iblock_idx, &fblock, true);
+		if (r != EOK)
+			goto Finish;
+
+		/* Do we get an unwritten range? */
+		if (fblock != 0) {
+			uint64_t off = fblock * block_size + unalg;
+			r = ext4_block_readbytes(f->mp->fs.bdev, off, u8_buf, len);
+			if (r != EOK)
+				goto Finish;
+
+		} else {
+			/* Yes, we do. */
+			memset(u8_buf, 0, len);
+		}
+
+		u8_buf += len;
+		size -= len;
+		f->fpos += len;
+
+		if (rcnt)
+			*rcnt += len;
+
+		iblock_idx++;
+	}
+
+	fblock_start = 0;
+	fblock_count = 0;
+	while (size >= block_size) {
+		while (iblock_idx < iblock_last) {
+			r = ext4_fs_get_inode_dblk_idx(&ref, iblock_idx,
+						       &fblock, true);
+			if (r != EOK)
+				goto Finish;
+
+			iblock_idx++;
+
+			if (!fblock_start)
+				fblock_start = fblock;
+
+			if ((fblock_start + fblock_count) != fblock)
+				break;
+
+			fblock_count++;
+		}
+
+		r = ext4_blocks_get_direct(f->mp->fs.bdev, u8_buf, fblock_start,
+					   fblock_count);
+		if (r != EOK)
+			goto Finish;
+
+		size -= block_size * fblock_count;
+		u8_buf += block_size * fblock_count;
+		f->fpos += block_size * fblock_count;
+
+		if (rcnt)
+			*rcnt += block_size * fblock_count;
+
+		fblock_start = fblock;
+		fblock_count = 1;
+	}
+
+	if (size) {
+		uint64_t off;
+		r = ext4_fs_get_inode_dblk_idx(&ref, iblock_idx, &fblock, true);
+		if (r != EOK)
+			goto Finish;
+
+		off = fblock * block_size;
+		r = ext4_block_readbytes(f->mp->fs.bdev, off, u8_buf, size);
+		if (r != EOK)
+			goto Finish;
+
+		f->fpos += size;
+
+		if (rcnt)
+			*rcnt += size;
+	}
+
+Finish:
+	ext4_fs_put_inode_ref(&ref);
+	EXT4_MP_UNLOCK(f->mp);
+	return r;
+}
+
+int ext4_fwrite(ext4_file *f, const void *buf, size_t size, size_t *wcnt)
+{
+	uint32_t unalg;
+	uint32_t iblk_idx;
+	uint32_t iblock_last;
+	uint32_t ifile_blocks;
+	uint32_t block_size;
+
+	uint32_t fblock_count;
+	ext4_fsblk_t fblk;
+	ext4_fsblk_t fblock_start;
+
+	struct ext4_inode_ref ref;
+	const uint8_t *u8_buf = buf;
+	int r, rr = EOK;
+
+	ext4_assert(f && f->mp);
+
+	if (f->flags & O_RDONLY)
+		return EPERM;
+
+	if (!size)
+		return EOK;
+
+	EXT4_MP_LOCK(f->mp);
+	ext4_trans_start(f->mp);
+
+	struct ext4_fs *const fs = &f->mp->fs;
+	struct ext4_sblock *const sb = &f->mp->fs.sb;
+
+	if (wcnt)
+		*wcnt = 0;
+
+	r = ext4_fs_get_inode_ref(fs, f->inode, &ref);
+	if (r != EOK) {
+		ext4_trans_abort(f->mp);
+		EXT4_MP_UNLOCK(f->mp);
+		return r;
+	}
+
+	/*Sync file size*/
+	f->fsize = ext4_inode_get_size(sb, ref.inode);
+	block_size = ext4_sb_get_block_size(sb);
+
+	iblock_last = (uint32_t)((f->fpos + size) / block_size);
+	iblk_idx = (uint32_t)(f->fpos / block_size);
+	ifile_blocks = (uint32_t)((f->fsize + block_size - 1) / block_size);
+
+	unalg = (f->fpos) % block_size;
+
+	if (unalg) {
+		size_t len =  size;
+		uint64_t off;
+		if (size > (block_size - unalg))
+			len = block_size - unalg;
+
+		r = ext4_fs_init_inode_dblk_idx(&ref, iblk_idx, &fblk);
+		if (r != EOK)
+			goto Finish;
+
+		off = fblk * block_size + unalg;
+		r = ext4_block_writebytes(f->mp->fs.bdev, off, u8_buf, len);
+		if (r != EOK)
+			goto Finish;
+
+		u8_buf += len;
+		size -= len;
+		f->fpos += len;
+
+		if (wcnt)
+			*wcnt += len;
+
+		iblk_idx++;
+	}
+
+	/*Start write back cache mode.*/
+	r = ext4_block_cache_write_back(f->mp->fs.bdev, 1);
+	if (r != EOK)
+		goto Finish;
+
+	fblock_start = 0;
+	fblock_count = 0;
+	while (size >= block_size) {
+
+		while (iblk_idx < iblock_last) {
+			if (iblk_idx < ifile_blocks) {
+				r = ext4_fs_init_inode_dblk_idx(&ref, iblk_idx,
+								&fblk);
+				if (r != EOK)
+					goto Finish;
+			} else {
+				rr = ext4_fs_append_inode_dblk(&ref, &fblk,
+							       &iblk_idx);
+				if (rr != EOK) {
+					/* Unable to append more blocks. But
+					 * some block might be allocated already
+					 * */
+					break;
+				}
+			}
+
+			iblk_idx++;
+
+			if (!fblock_start) {
+				fblock_start = fblk;
+			}
+
+			if ((fblock_start + fblock_count) != fblk)
+				break;
+
+			fblock_count++;
+		}
+
+		r = ext4_blocks_set_direct(f->mp->fs.bdev, u8_buf, fblock_start,
+					   fblock_count);
+		if (r != EOK)
+			break;
+
+		size -= block_size * fblock_count;
+		u8_buf += block_size * fblock_count;
+		f->fpos += block_size * fblock_count;
+
+		if (wcnt)
+			*wcnt += block_size * fblock_count;
+
+		fblock_start = fblk;
+		fblock_count = 1;
+
+		if (rr != EOK) {
+			/*ext4_fs_append_inode_block has failed and no
+			 * more blocks might be written. But node size
+			 * should be updated.*/
+			r = rr;
+			goto out_fsize;
+		}
+	}
+
+	/*Stop write back cache mode*/
+	ext4_block_cache_write_back(f->mp->fs.bdev, 0);
+
+	if (r != EOK)
+		goto Finish;
+
+	if (size) {
+		uint64_t off;
+		if (iblk_idx < ifile_blocks) {
+			r = ext4_fs_init_inode_dblk_idx(&ref, iblk_idx, &fblk);
+			if (r != EOK)
+				goto Finish;
+		} else {
+			r = ext4_fs_append_inode_dblk(&ref, &fblk, &iblk_idx);
+			if (r != EOK)
+				/*Node size sholud be updated.*/
+				goto out_fsize;
+		}
+
+		off = fblk * block_size;
+		r = ext4_block_writebytes(f->mp->fs.bdev, off, u8_buf, size);
+		if (r != EOK)
+			goto Finish;
+
+		f->fpos += size;
+
+		if (wcnt)
+			*wcnt += size;
+	}
+
+out_fsize:
+	if (f->fpos > f->fsize) {
+		f->fsize = f->fpos;
+		ext4_inode_set_size(ref.inode, f->fsize);
+		ref.dirty = true;
+	}
+
+Finish:
+	r = ext4_fs_put_inode_ref(&ref);
+
+	if (r != EOK)
+		ext4_trans_abort(f->mp);
+	else
+		ext4_trans_stop(f->mp);
+
+	EXT4_MP_UNLOCK(f->mp);
+	return r;
+}
+
+int ext4_fseek(ext4_file *f, uint64_t offset, uint32_t origin)
+{
+	switch (origin) {
+	case SEEK_SET:
+		if (offset > f->fsize)
+			return EINVAL;
+
+		f->fpos = offset;
+		return EOK;
+	case SEEK_CUR:
+		if ((offset + f->fpos) > f->fsize)
+			return EINVAL;
+
+		f->fpos += offset;
+		return EOK;
+	case SEEK_END:
+		if (offset > f->fsize)
+			return EINVAL;
+
+		f->fpos = f->fsize - offset;
+		return EOK;
+	}
+	return EINVAL;
+}
+
+uint64_t ext4_ftell(ext4_file *f)
+{
+	return f->fpos;
+}
+
+uint64_t ext4_fsize(ext4_file *f)
+{
+	return f->fsize;
+}
+
+int ext4_chmod(const char *path, uint32_t mode)
+{
+	int r;
+	uint32_t ino, orig_mode;
+	ext4_file f;
+	struct ext4_sblock *sb;
+	struct ext4_inode_ref inode_ref;
+	struct ext4_mountpoint *mp = ext4_get_mount(path);
+
+	if (!mp)
+		return ENOENT;
+
+	EXT4_MP_LOCK(mp);
+	ext4_trans_start(mp);
+
+	r = ext4_generic_open2(&f, path, O_RDWR, EXT4_DE_UNKNOWN, NULL, NULL);
+	if (r != EOK) {
+		ext4_trans_abort(mp);
+		EXT4_MP_UNLOCK(mp);
+		return r;
+	}
+	ino = f.inode;
+	sb = &mp->fs.sb;
+	ext4_fclose(&f);
+	r = ext4_fs_get_inode_ref(&mp->fs, ino, &inode_ref);
+	if (r != EOK) {
+		ext4_trans_abort(mp);
+		EXT4_MP_UNLOCK(mp);
+		return r;
+	}
+
+	orig_mode = ext4_inode_get_mode(sb, inode_ref.inode);
+	orig_mode &= ~0xFFF;
+	orig_mode |= mode & 0xFFF;
+	ext4_inode_set_mode(sb, inode_ref.inode, orig_mode);
+	inode_ref.dirty = true;
+
+	r = ext4_fs_put_inode_ref(&inode_ref);
+	if (r != EOK)
+		ext4_trans_abort(mp);
+	else
+		ext4_trans_stop(mp);
+
+	EXT4_MP_UNLOCK(mp);
+	return r;
+}
+
+int ext4_chown(const char *path, uint32_t uid, uint32_t gid)
+{
+	int r;
+	ext4_file f;
+	uint32_t ino;
+	struct ext4_inode_ref inode_ref;
+	struct ext4_mountpoint *mp = ext4_get_mount(path);
+
+	if (!mp)
+		return ENOENT;
+
+	EXT4_MP_LOCK(mp);
+	ext4_trans_start(mp);
+
+	r = ext4_generic_open2(&f, path, O_RDWR, EXT4_DE_UNKNOWN, NULL, NULL);
+	if (r != EOK) {
+		ext4_trans_abort(mp);
+		EXT4_MP_UNLOCK(mp);
+		return r;
+	}
+	ino = f.inode;
+	ext4_fclose(&f);
+	r = ext4_fs_get_inode_ref(&mp->fs, ino, &inode_ref);
+	if (r != EOK) {
+		ext4_trans_abort(mp);
+		EXT4_MP_UNLOCK(mp);
+		return r;
+	}
+
+	ext4_inode_set_uid(inode_ref.inode, uid);
+	ext4_inode_set_gid(inode_ref.inode, gid);
+	inode_ref.dirty = true;
+
+	r = ext4_fs_put_inode_ref(&inode_ref);
+	if (r != EOK)
+		ext4_trans_abort(mp);
+	else
+		ext4_trans_stop(mp);
+
+	EXT4_MP_UNLOCK(mp);
+	return r;
+}
+
+int ext4_file_set_atime(const char *path, uint32_t atime)
+{
+	int r;
+	ext4_file f;
+	uint32_t ino;
+	struct ext4_inode_ref inode_ref;
+	struct ext4_mountpoint *mp = ext4_get_mount(path);
+
+	if (!mp)
+		return ENOENT;
+
+	EXT4_MP_LOCK(mp);
+	ext4_trans_start(mp);
+
+	r = ext4_generic_open2(&f, path, O_RDWR, EXT4_DE_UNKNOWN, NULL, NULL);
+	if (r != EOK) {
+		ext4_trans_abort(mp);
+		EXT4_MP_UNLOCK(mp);
+		return r;
+	}
+	ino = f.inode;
+	ext4_fclose(&f);
+	r = ext4_fs_get_inode_ref(&mp->fs, ino, &inode_ref);
+	if (r != EOK) {
+		ext4_trans_abort(mp);
+		EXT4_MP_UNLOCK(mp);
+		return r;
+	}
+
+	ext4_inode_set_access_time(inode_ref.inode, atime);
+	inode_ref.dirty = true;
+
+	r = ext4_fs_put_inode_ref(&inode_ref);
+	if (r != EOK)
+		ext4_trans_abort(mp);
+	else
+		ext4_trans_stop(mp);
+
+	EXT4_MP_UNLOCK(mp);
+	return r;
+}
+
+int ext4_file_set_mtime(const char *path, uint32_t mtime)
+{
+	int r;
+	ext4_file f;
+	uint32_t ino;
+	struct ext4_inode_ref inode_ref;
+	struct ext4_mountpoint *mp = ext4_get_mount(path);
+
+	if (!mp)
+		return ENOENT;
+
+	EXT4_MP_LOCK(mp);
+	ext4_trans_start(mp);
+
+	r = ext4_generic_open2(&f, path, O_RDWR, EXT4_DE_UNKNOWN, NULL, NULL);
+	if (r != EOK) {
+		ext4_trans_abort(mp);
+		EXT4_MP_UNLOCK(mp);
+		return r;
+	}
+	ino = f.inode;
+	ext4_fclose(&f);
+	r = ext4_fs_get_inode_ref(&mp->fs, ino, &inode_ref);
+	if (r != EOK) {
+		ext4_trans_abort(mp);
+		EXT4_MP_UNLOCK(mp);
+		return r;
+	}
+
+	ext4_inode_set_modif_time(inode_ref.inode, mtime);
+	inode_ref.dirty = true;
+
+	r = ext4_fs_put_inode_ref(&inode_ref);
+	if (r != EOK)
+		ext4_trans_abort(mp);
+	else
+		ext4_trans_stop(mp);
+
+	EXT4_MP_UNLOCK(mp);
+	return r;
+}
+
+int ext4_file_set_ctime(const char *path, uint32_t ctime)
+{
+	int r;
+	ext4_file f;
+	uint32_t ino;
+	struct ext4_inode_ref inode_ref;
+	struct ext4_mountpoint *mp = ext4_get_mount(path);
+
+	if (!mp)
+		return ENOENT;
+
+	EXT4_MP_LOCK(mp);
+	ext4_trans_start(mp);
+
+	r = ext4_generic_open2(&f, path, O_RDWR, EXT4_DE_UNKNOWN, NULL, NULL);
+	if (r != EOK) {
+		ext4_trans_abort(mp);
+		EXT4_MP_UNLOCK(mp);
+		return r;
+	}
+	ino = f.inode;
+	ext4_fclose(&f);
+	r = ext4_fs_get_inode_ref(&mp->fs, ino, &inode_ref);
+	if (r != EOK) {
+		ext4_trans_abort(mp);
+		EXT4_MP_UNLOCK(mp);
+		return r;
+	}
+
+	ext4_inode_set_change_inode_time(inode_ref.inode, ctime);
+	inode_ref.dirty = true;
+
+	r = ext4_fs_put_inode_ref(&inode_ref);
+	if (r != EOK)
+		ext4_trans_abort(mp);
+	else
+		ext4_trans_stop(mp);
+
+	EXT4_MP_UNLOCK(mp);
+	return r;
+}
+
+static int ext4_fsymlink_set(ext4_file *f, const void *buf, uint32_t size)
+{
+	struct ext4_inode_ref ref;
+	uint32_t sblock;
+	ext4_fsblk_t fblock;
+	uint32_t block_size;
+	int r;
+
+	ext4_assert(f && f->mp);
+
+	if (!size)
+		return EOK;
+
+	r = ext4_fs_get_inode_ref(&f->mp->fs, f->inode, &ref);
+	if (r != EOK)
+		return r;
+
+	/*Sync file size*/
+	block_size = ext4_sb_get_block_size(&f->mp->fs.sb);
+	if (size > block_size) {
+		r = EINVAL;
+		goto Finish;
+	}
+	r = ext4_ftruncate_no_lock(f, 0);
+	if (r != EOK)
+		goto Finish;
+
+	/*Start write back cache mode.*/
+	r = ext4_block_cache_write_back(f->mp->fs.bdev, 1);
+	if (r != EOK)
+		goto Finish;
+
+	/*If the size of symlink is smaller than 60 bytes*/
+	if (size < sizeof(ref.inode->blocks)) {
+		memset(ref.inode->blocks, 0, sizeof(ref.inode->blocks));
+		memcpy(ref.inode->blocks, buf, size);
+		ext4_inode_clear_flag(ref.inode, EXT4_INODE_FLAG_EXTENTS);
+	} else {
+		ext4_fs_inode_blocks_init(&f->mp->fs, &ref);
+		r = ext4_fs_append_inode_dblk(&ref, &fblock, &sblock);
+		if (r != EOK)
+			goto Finish;
+
+		r = ext4_block_writebytes(f->mp->fs.bdev, 0, buf, size);
+		if (r != EOK)
+			goto Finish;
+
+	}
+
+	/*Stop write back cache mode*/
+	ext4_block_cache_write_back(f->mp->fs.bdev, 0);
+
+	if (r != EOK)
+		goto Finish;
+
+	ext4_inode_set_size(ref.inode, size);
+	ref.dirty = true;
+
+	f->fsize = size;
+	if (f->fpos > size)
+		f->fpos = size;
+
+Finish:
+	ext4_fs_put_inode_ref(&ref);
+	return r;
+}
+
+int ext4_fsymlink(const char *target, const char *path)
+{
+	struct ext4_mountpoint *mp = ext4_get_mount(path);
+	int r;
+	ext4_file f;
+	int filetype;
+
+	if (!mp)
+		return ENOENT;
+
+	filetype = EXT4_DE_SYMLINK;
+
+	EXT4_MP_LOCK(mp);
+	ext4_trans_start(mp);
+
+	ext4_block_cache_write_back(mp->fs.bdev, 1);
+	r = ext4_generic_open2(&f, path, O_RDWR|O_CREAT, filetype, NULL, NULL);
+	if (r == EOK)
+		r = ext4_fsymlink_set(&f, target, strlen(target));
+	else
+		goto Finish;
+
+	ext4_fclose(&f);
+
+Finish:
+	ext4_block_cache_write_back(mp->fs.bdev, 0);
+
+	if (r != EOK)
+		ext4_trans_abort(mp);
+	else
+		ext4_trans_stop(mp);
+
+	EXT4_MP_UNLOCK(mp);
+	return r;
+}
+
+int ext4_readlink(const char *path, char *buf, size_t bufsize, size_t *rcnt)
+{
+	struct ext4_mountpoint *mp = ext4_get_mount(path);
+	int r;
+	ext4_file f;
+	int filetype;
+
+	if (!mp)
+		return ENOENT;
+
+	if (!buf)
+		return EINVAL;
+
+	filetype = EXT4_DE_SYMLINK;
+
+	EXT4_MP_LOCK(mp);
+	ext4_block_cache_write_back(mp->fs.bdev, 1);
+	r = ext4_generic_open2(&f, path, O_RDONLY, filetype, NULL, NULL);
+	if (r == EOK)
+		r = ext4_fread(&f, buf, bufsize, rcnt);
+	else
+		goto Finish;
+
+	ext4_fclose(&f);
+
+Finish:
+	ext4_block_cache_write_back(mp->fs.bdev, 0);
+	if (r != EOK)
+		ext4_trans_abort(mp);
+	else
+		ext4_trans_stop(mp);
+
+	EXT4_MP_UNLOCK(mp);
+	return r;
+}
+
+int ext4_setxattr(const char *path, const char *name, size_t name_len,
+		  const void *data, size_t data_size, bool replace)
+{
+	int r = EOK;
+	ext4_file f;
+	uint32_t inode;
+	uint8_t name_index;
+	const char *dissected_name = NULL;
+	size_t dissected_len = 0;
+	struct ext4_xattr_ref xattr_ref;
+	struct ext4_inode_ref inode_ref;
+	struct ext4_mountpoint *mp = ext4_get_mount(path);
+	if (!mp)
+		return ENOENT;
+
+	dissected_name = ext4_extract_xattr_name(name, name_len,
+				&name_index, &dissected_len);
+	if (!dissected_len)
+		return EINVAL;
+
+	EXT4_MP_LOCK(mp);
+	ext4_trans_start(mp);
+
+	r = ext4_generic_open2(&f, path, O_RDWR, EXT4_DE_UNKNOWN, NULL, NULL);
+	if (r != EOK)
+		goto Finish;
+	inode = f.inode;
+	ext4_fclose(&f);
+
+	r = ext4_fs_get_inode_ref(&mp->fs, inode, &inode_ref);
+	if (r != EOK)
+		goto Finish;
+
+	r = ext4_fs_get_xattr_ref(&mp->fs, &inode_ref, &xattr_ref);
+	if (r != EOK) {
+		ext4_fs_put_inode_ref(&inode_ref);
+		goto Finish;
+	}
+
+	r = ext4_fs_set_xattr(&xattr_ref, name_index, dissected_name,
+			dissected_len, data, data_size, replace);
+
+	ext4_fs_put_xattr_ref(&xattr_ref);
+	ext4_fs_put_inode_ref(&inode_ref);
+Finish:
+	if (r != EOK)
+		ext4_trans_abort(mp);
+	else
+		ext4_trans_stop(mp);
+
+	EXT4_MP_UNLOCK(mp);
+	return r;
+}
+
+int ext4_getxattr(const char *path, const char *name, size_t name_len,
+		  void *buf, size_t buf_size, size_t *data_size)
+{
+	int r = EOK;
+	ext4_file f;
+	uint32_t inode;
+	uint8_t name_index;
+	const char *dissected_name = NULL;
+	size_t dissected_len = 0;
+	struct ext4_xattr_ref xattr_ref;
+	struct ext4_inode_ref inode_ref;
+	struct ext4_mountpoint *mp = ext4_get_mount(path);
+	if (!mp)
+		return ENOENT;
+
+	dissected_name = ext4_extract_xattr_name(name, name_len,
+				&name_index, &dissected_len);
+	if (!dissected_len)
+		return EINVAL;
+
+	EXT4_MP_LOCK(mp);
+	r = ext4_generic_open2(&f, path, O_RDWR, EXT4_DE_UNKNOWN, NULL, NULL);
+	if (r != EOK)
+		goto Finish;
+	inode = f.inode;
+	ext4_fclose(&f);
+
+	r = ext4_fs_get_inode_ref(&mp->fs, inode, &inode_ref);
+	if (r != EOK)
+		goto Finish;
+
+	r = ext4_fs_get_xattr_ref(&mp->fs, &inode_ref, &xattr_ref);
+	if (r != EOK) {
+		ext4_fs_put_inode_ref(&inode_ref);
+		goto Finish;
+	}
+
+	r = ext4_fs_get_xattr(&xattr_ref, name_index, dissected_name,
+				dissected_len, buf, buf_size, data_size);
+
+	ext4_fs_put_xattr_ref(&xattr_ref);
+	ext4_fs_put_inode_ref(&inode_ref);
+Finish:
+	EXT4_MP_UNLOCK(mp);
+	return r;
+}
+
+struct ext4_listxattr_iterator {
+	char *list;
+	char *list_ptr;
+	size_t size;
+	size_t ret_size;
+	bool list_too_small;
+	bool get_required_size;
+};
+
+static int ext4_iterate_ea_list(struct ext4_xattr_ref *ref,
+				struct ext4_xattr_item *item)
+{
+	struct ext4_listxattr_iterator *lxi;
+	lxi = ref->iter_arg;
+	if (!lxi->get_required_size) {
+		size_t plen;
+		const char *prefix;
+		prefix = ext4_get_xattr_name_prefix(item->name_index, &plen);
+		if (lxi->ret_size + plen + item->name_len + 1 > lxi->size) {
+			lxi->list_too_small = 1;
+			return EXT4_XATTR_ITERATE_STOP;
+		}
+		if (prefix) {
+			memcpy(lxi->list_ptr, prefix, plen);
+			lxi->list_ptr += plen;
+			lxi->ret_size += plen;
+		}
+		memcpy(lxi->list_ptr, item->name, item->name_len);
+		lxi->list_ptr[item->name_len] = 0;
+		lxi->list_ptr += item->name_len + 1;
+	}
+	lxi->ret_size += item->name_len + 1;
+	return EXT4_XATTR_ITERATE_CONT;
+}
+
+int ext4_listxattr(const char *path, char *list, size_t size, size_t *ret_size)
+{
+	int r = EOK;
+	ext4_file f;
+	uint32_t inode;
+	struct ext4_xattr_ref xattr_ref;
+	struct ext4_inode_ref inode_ref;
+	struct ext4_listxattr_iterator lxi;
+	struct ext4_mountpoint *mp = ext4_get_mount(path);
+	if (!mp)
+		return ENOENT;
+
+	lxi.list = list;
+	lxi.list_ptr = list;
+	lxi.size = size;
+	lxi.ret_size = 0;
+	lxi.list_too_small = false;
+	lxi.get_required_size = (!size) ? true : false;
+
+	EXT4_MP_LOCK(mp);
+	r = ext4_generic_open2(&f, path, O_RDWR, EXT4_DE_UNKNOWN, NULL, NULL);
+	if (r != EOK)
+		goto Finish;
+	inode = f.inode;
+	ext4_fclose(&f);
+
+	r = ext4_fs_get_inode_ref(&mp->fs, inode, &inode_ref);
+	if (r != EOK)
+		goto Finish;
+
+	r = ext4_fs_get_xattr_ref(&mp->fs, &inode_ref, &xattr_ref);
+	if (r != EOK) {
+		ext4_fs_put_inode_ref(&inode_ref);
+		goto Finish;
+	}
+
+	xattr_ref.iter_arg = &lxi;
+	ext4_fs_xattr_iterate(&xattr_ref, ext4_iterate_ea_list);
+	if (lxi.list_too_small)
+		r = ERANGE;
+
+	if (r == EOK) {
+		if (ret_size)
+			*ret_size = lxi.ret_size;
+
+	}
+	ext4_fs_put_xattr_ref(&xattr_ref);
+	ext4_fs_put_inode_ref(&inode_ref);
+Finish:
+	EXT4_MP_UNLOCK(mp);
+	return r;
+
+}
+
+int ext4_removexattr(const char *path, const char *name, size_t name_len)
+{
+	int r = EOK;
+	ext4_file f;
+	uint32_t inode;
+	uint8_t name_index;
+	const char *dissected_name = NULL;
+	size_t dissected_len = 0;
+	struct ext4_xattr_ref xattr_ref;
+	struct ext4_inode_ref inode_ref;
+	struct ext4_mountpoint *mp = ext4_get_mount(path);
+	if (!mp)
+		return ENOENT;
+
+	dissected_name = ext4_extract_xattr_name(name, name_len,
+						&name_index, &dissected_len);
+	if (!dissected_len)
+		return EINVAL;
+
+	EXT4_MP_LOCK(mp);
+	ext4_trans_start(mp);
+
+	r = ext4_generic_open2(&f, path, O_RDWR, EXT4_DE_UNKNOWN, NULL, NULL);
+	if (r != EOK)
+		goto Finish;
+	inode = f.inode;
+	ext4_fclose(&f);
+
+	r = ext4_fs_get_inode_ref(&mp->fs, inode, &inode_ref);
+	if (r != EOK)
+		goto Finish;
+
+	r = ext4_fs_get_xattr_ref(&mp->fs, &inode_ref, &xattr_ref);
+	if (r != EOK) {
+		ext4_fs_put_inode_ref(&inode_ref);
+		goto Finish;
+	}
+
+	r = ext4_fs_remove_xattr(&xattr_ref, name_index, dissected_name,
+				dissected_len);
+
+	ext4_fs_put_xattr_ref(&xattr_ref);
+	ext4_fs_put_inode_ref(&inode_ref);
+Finish:
+	if (r != EOK)
+		ext4_trans_abort(mp);
+	else
+		ext4_trans_stop(mp);
+
+	EXT4_MP_UNLOCK(mp);
+	return r;
+
+}
+
+/*********************************DIRECTORY OPERATION************************/
+
+int ext4_dir_rm(const char *path)
+{
+	int r;
+	int len;
+	ext4_file f;
+
+	struct ext4_mountpoint *mp = ext4_get_mount(path);
+	struct ext4_inode_ref act;
+	struct ext4_inode_ref child;
+	struct ext4_dir_iter it;
+
+	uint32_t name_off;
+	uint32_t inode_up;
+	uint32_t inode_current;
+	uint32_t depth = 1;
+
+	bool has_children;
+	bool is_goal;
+	bool dir_end;
+
+	if (!mp)
+		return ENOENT;
+
+	EXT4_MP_LOCK(mp);
+
+	struct ext4_fs *const fs = &mp->fs;
+
+	/*Check if exist.*/
+	r = ext4_generic_open(&f, path, "r", false, &inode_up, &name_off);
+	if (r != EOK) {
+		ext4_trans_abort(mp);
+		EXT4_MP_UNLOCK(mp);
+		return r;
+	}
+
+	path += name_off;
+	len = ext4_path_check(path, &is_goal);
+
+	inode_current = f.inode;
+
+	ext4_block_cache_write_back(mp->fs.bdev, 1);
+
+	do {
+
+		uint64_t act_curr_pos = 0;
+		has_children = false;
+		dir_end = false;
+
+		while (r == EOK && !has_children && !dir_end) {
+
+			/*Load directory node.*/
+			r = ext4_fs_get_inode_ref(fs, inode_current, &act);
+			if (r != EOK) {
+				break;
+			}
+
+			/*Initialize iterator.*/
+			r = ext4_dir_iterator_init(&it, &act, act_curr_pos);
+			if (r != EOK) {
+				ext4_fs_put_inode_ref(&act);
+				break;
+			}
+
+			if (!it.curr) {
+				dir_end = true;
+				goto End;
+			}
+
+			ext4_trans_start(mp);
+
+			/*Get up directory inode when ".." entry*/
+			if ((it.curr->name_len == 2) &&
+			    ext4_is_dots(it.curr->name, it.curr->name_len)) {
+				inode_up = ext4_dir_en_get_inode(it.curr);
+			}
+
+			/*If directory or file entry,  but not "." ".." entry*/
+			if (!ext4_is_dots(it.curr->name, it.curr->name_len)) {
+
+				/*Get child inode reference do unlink
+				 * directory/file.*/
+				uint32_t cinode;
+				uint32_t inode_type;
+				cinode = ext4_dir_en_get_inode(it.curr);
+				r = ext4_fs_get_inode_ref(fs, cinode, &child);
+				if (r != EOK)
+					goto End;
+
+				/*If directory with no leaf children*/
+				r = ext4_has_children(&has_children, &child);
+				if (r != EOK) {
+					ext4_fs_put_inode_ref(&child);
+					goto End;
+				}
+
+				if (has_children) {
+					/*Has directory children. Go into this
+					 * directory.*/
+					inode_up = inode_current;
+					inode_current = cinode;
+					depth++;
+					ext4_fs_put_inode_ref(&child);
+					goto End;
+				}
+				inode_type = ext4_inode_type(&mp->fs.sb,
+						child.inode);
+
+				/* Truncate */
+				if (inode_type != EXT4_INODE_MODE_DIRECTORY)
+					r = ext4_trunc_inode(mp, child.index, 0);
+				else
+					r = ext4_trunc_dir(mp, &act, &child);
+
+				if (r != EOK) {
+					ext4_fs_put_inode_ref(&child);
+					goto End;
+				}
+
+				/*No children in child directory or file. Just
+				 * unlink.*/
+				r = ext4_unlink(f.mp, &act, &child,
+						(char *)it.curr->name,
+						it.curr->name_len);
+				if (r != EOK) {
+					ext4_fs_put_inode_ref(&child);
+					goto End;
+				}
+
+				ext4_inode_set_del_time(child.inode, -1L);
+				ext4_inode_set_links_cnt(child.inode, 0);
+				child.dirty = true;
+
+				r = ext4_fs_free_inode(&child);
+				if (r != EOK) {
+					ext4_fs_put_inode_ref(&child);
+					goto End;
+				}
+
+				r = ext4_fs_put_inode_ref(&child);
+				if (r != EOK)
+					goto End;
+
+			}
+
+			r = ext4_dir_iterator_next(&it);
+			if (r != EOK)
+				goto End;
+
+			act_curr_pos = it.curr_off;
+End:
+			ext4_dir_iterator_fini(&it);
+			if (r == EOK)
+				r = ext4_fs_put_inode_ref(&act);
+			else
+				ext4_fs_put_inode_ref(&act);
+
+			if (r != EOK)
+				ext4_trans_abort(mp);
+			else
+				ext4_trans_stop(mp);
+		}
+
+		if (dir_end) {
+			/*Directory iterator reached last entry*/
+			depth--;
+			if (depth)
+				inode_current = inode_up;
+
+		}
+
+		if (r != EOK)
+			break;
+
+	} while (depth);
+
+	/*Last unlink*/
+	if (r == EOK && !depth) {
+		/*Load parent.*/
+		struct ext4_inode_ref parent;
+		r = ext4_fs_get_inode_ref(&f.mp->fs, inode_up,
+				&parent);
+		if (r != EOK)
+			goto Finish;
+		r = ext4_fs_get_inode_ref(&f.mp->fs, inode_current,
+				&act);
+		if (r != EOK) {
+			ext4_fs_put_inode_ref(&act);
+			goto Finish;
+		}
+
+		ext4_trans_start(mp);
+
+		/* In this place all directories should be
+		 * unlinked.
+		 * Last unlink from root of current directory*/
+		r = ext4_unlink(f.mp, &parent, &act,
+				(char *)path, len);
+		if (r != EOK) {
+			ext4_fs_put_inode_ref(&parent);
+			ext4_fs_put_inode_ref(&act);
+			goto Finish;
+		}
+
+		if (ext4_inode_get_links_cnt(act.inode) == 2) {
+			ext4_inode_set_del_time(act.inode, -1L);
+			ext4_inode_set_links_cnt(act.inode, 0);
+			act.dirty = true;
+			/*Truncate*/
+			r = ext4_trunc_dir(mp, &parent, &act);
+			if (r != EOK) {
+				ext4_fs_put_inode_ref(&parent);
+				ext4_fs_put_inode_ref(&act);
+				goto Finish;
+			}
+
+			r = ext4_fs_free_inode(&act);
+			if (r != EOK) {
+				ext4_fs_put_inode_ref(&parent);
+				ext4_fs_put_inode_ref(&act);
+				goto Finish;
+			}
+		}
+
+		r = ext4_fs_put_inode_ref(&parent);
+		if (r != EOK)
+			goto Finish;
+
+		r = ext4_fs_put_inode_ref(&act);
+	Finish:
+		if (r != EOK)
+			ext4_trans_abort(mp);
+		else
+			ext4_trans_stop(mp);
+	}
+
+	ext4_block_cache_write_back(mp->fs.bdev, 0);
+	EXT4_MP_UNLOCK(mp);
+
+	return r;
+}
+
+int ext4_dir_mk(const char *path)
+{
+	int r;
+	ext4_file f;
+
+	struct ext4_mountpoint *mp = ext4_get_mount(path);
+
+	if (!mp)
+		return ENOENT;
+
+	EXT4_MP_LOCK(mp);
+	ext4_trans_start(mp);
+
+	/*Check if exist.*/
+	r = ext4_generic_open(&f, path, "r", false, 0, 0);
+	if (r == EOK) {
+		/*Directory already created*/
+		ext4_trans_stop(mp);
+		EXT4_MP_UNLOCK(mp);
+		return r;
+	}
+
+	/*Create new dir*/
+	r = ext4_generic_open(&f, path, "w", false, 0, 0);
+	if (r != EOK) {
+		ext4_trans_abort(mp);
+		EXT4_MP_UNLOCK(mp);
+		return r;
+	}
+
+	ext4_trans_stop(mp);
+	EXT4_MP_UNLOCK(mp);
+	return r;
+}
+
+int ext4_dir_open(ext4_dir *d, const char *path)
+{
+	struct ext4_mountpoint *mp = ext4_get_mount(path);
+	int r;
+
+	if (!mp)
+		return ENOENT;
+
+	EXT4_MP_LOCK(mp);
+	r = ext4_generic_open(&d->f, path, "r", false, 0, 0);
+	d->next_off = 0;
+	EXT4_MP_UNLOCK(mp);
+	return r;
+}
+
+int ext4_dir_close(ext4_dir *d)
+{
+    return ext4_fclose(&d->f);
+}
+
+const ext4_direntry *ext4_dir_entry_next(ext4_dir *d)
+{
+#define EXT4_DIR_ENTRY_OFFSET_TERM (uint64_t)(-1)
+
+	int r;
+	ext4_direntry *de = 0;
+	struct ext4_inode_ref dir;
+	struct ext4_dir_iter it;
+
+	EXT4_MP_LOCK(d->f.mp);
+
+	if (d->next_off == EXT4_DIR_ENTRY_OFFSET_TERM) {
+		EXT4_MP_UNLOCK(d->f.mp);
+		return 0;
+	}
+
+	r = ext4_fs_get_inode_ref(&d->f.mp->fs, d->f.inode, &dir);
+	if (r != EOK) {
+		goto Finish;
+	}
+
+	r = ext4_dir_iterator_init(&it, &dir, d->next_off);
+	if (r != EOK) {
+		ext4_fs_put_inode_ref(&dir);
+		goto Finish;
+	}
+
+	memcpy(&d->de, it.curr, sizeof(ext4_direntry));
+	de = &d->de;
+
+	ext4_dir_iterator_next(&it);
+
+	d->next_off = it.curr ? it.curr_off : EXT4_DIR_ENTRY_OFFSET_TERM;
+
+	ext4_dir_iterator_fini(&it);
+	ext4_fs_put_inode_ref(&dir);
+
+Finish:
+	EXT4_MP_UNLOCK(d->f.mp);
+	return de;
+}
+
+void ext4_dir_entry_rewind(ext4_dir *d)
+{
+	d->next_off = 0;
+}
+
+/**
+ * @}
+ */