ref: 8321f180e635400137d052270e3c463a81738c1f
dir: /src/ext4.c/
/*
* 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_types.h"
#include "ext4_misc.h"
#include "ext4_errno.h"
#include "ext4_oflags.h"
#include "ext4_debug.h"
#include "ext4.h"
#include "ext4_trans.h"
#include "ext4_blockdev.h"
#include "ext4_fs.h"
#include "ext4_dir.h"
#include "ext4_inode.h"
#include "ext4_super.h"
#include "ext4_block_group.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[CONFIG_EXT4_MAX_MP_NAME + 1];
/**@brief OS dependent lock/unlock functions.*/
const struct ext4_lock *os_locks;
/**@brief Ext4 filesystem internals.*/
struct ext4_fs fs;
/**@brief JBD fs.*/
struct jbd_fs jbd_fs;
/**@brief Journal.*/
struct jbd_journal jbd_journal;
};
/**@brief Block devices descriptor.*/
struct ext4_block_devices {
/**@brief Block device name.*/
char name[CONFIG_EXT4_MAX_BLOCKDEV_NAME + 1];
/**@brief Block device handle.*/
struct ext4_blockdev *bd;
};
/**@brief Block devices.*/
static struct ext4_block_devices s_bdevices[CONFIG_EXT4_BLOCKDEVS_COUNT];
/**@brief Mountpoints.*/
static struct ext4_mountpoint s_mp[CONFIG_EXT4_MOUNTPOINTS_COUNT];
int ext4_device_register(struct ext4_blockdev *bd,
const char *dev_name)
{
ext4_assert(bd && dev_name);
if (strlen(dev_name) > CONFIG_EXT4_MAX_BLOCKDEV_NAME)
return EINVAL;
for (size_t i = 0; i < CONFIG_EXT4_BLOCKDEVS_COUNT; ++i) {
if (!strcmp(s_bdevices[i].name, dev_name))
return EEXIST;
}
for (size_t i = 0; i < CONFIG_EXT4_BLOCKDEVS_COUNT; ++i) {
if (!s_bdevices[i].bd) {
strcpy(s_bdevices[i].name, dev_name);
s_bdevices[i].bd = bd;
return EOK;
}
}
return ENOSPC;
}
int ext4_device_unregister(const char *dev_name)
{
ext4_assert(dev_name);
for (size_t i = 0; i < CONFIG_EXT4_BLOCKDEVS_COUNT; ++i) {
if (strcmp(s_bdevices[i].name, dev_name))
continue;
memset(&s_bdevices[i], 0, sizeof(s_bdevices[i]));
}
return ENOENT;
}
int ext4_device_unregister_all(void)
{
memset(s_bdevices, 0, sizeof(s_bdevices));
return EOK;
}
/****************************************************************************/
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,
bool read_only)
{
int r;
uint32_t bsize;
struct ext4_bcache *bc;
struct ext4_blockdev *bd = 0;
struct ext4_mountpoint *mp = 0;
ext4_assert(mount_point && dev_name);
size_t mp_len = strlen(mount_point);
if (mp_len > CONFIG_EXT4_MAX_MP_NAME)
return EINVAL;
if (mount_point[mp_len - 1] != '/')
return ENOTSUP;
for (size_t i = 0; i < CONFIG_EXT4_BLOCKDEVS_COUNT; ++i) {
if (s_bdevices[i].name) {
if (!strcmp(dev_name, s_bdevices[i].name)) {
bd = s_bdevices[i].bd;
break;
}
}
}
if (!bd)
return ENODEV;
for (size_t i = 0; i < CONFIG_EXT4_MOUNTPOINTS_COUNT; ++i) {
if (!s_mp[i].mounted) {
strcpy(s_mp[i].name, mount_point);
s_mp[i].mounted = 1;
mp = &s_mp[i];
break;
}
if (!strcmp(s_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, read_only);
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);
bc = ext4_malloc(sizeof(struct ext4_bcache));
r = ext4_bcache_init_dynamic(bc, CONFIG_BLOCK_DEV_CACHE_SIZE, bsize);
if (r != EOK) {
ext4_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);
ext4_bcache_fini_dynamic(bc);
ext4_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(s_mp[i].name, mount_point)) {
mp = &s_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);
ext4_bcache_fini_dynamic(mp->fs.bdev->bc);
ext4_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 (!s_mp[i].mounted)
continue;
if (!strncmp(s_mp[i].name, path, strlen(s_mp[i].name)))
return &s_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 (mp->fs.read_only)
return EOK;
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 (mp->fs.read_only)
return EOK;
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 = ext4_calloc(1, sizeof(struct jbd_fs));
if (!jbd_fs) {
r = ENOMEM;
goto Finish;
}
r = jbd_get_fs(&mp->fs, jbd_fs);
if (r != EOK) {
ext4_free(jbd_fs);
goto Finish;
}
r = jbd_recover(jbd_fs);
jbd_put_fs(jbd_fs);
ext4_free(jbd_fs);
}
if (r == EOK && !mp->fs.read_only) {
uint32_t bgid;
uint64_t free_blocks_count = 0;
uint32_t free_inodes_count = 0;
struct ext4_block_group_ref bg_ref;
/* Update superblock's stats */
for (bgid = 0;bgid < ext4_block_group_cnt(&mp->fs.sb);bgid++) {
r = ext4_fs_get_block_group_ref(&mp->fs, bgid, &bg_ref);
if (r != EOK)
goto Finish;
free_blocks_count +=
ext4_bg_get_free_blocks_count(bg_ref.block_group,
&mp->fs.sb);
free_inodes_count +=
ext4_bg_get_free_inodes_count(bg_ref.block_group,
&mp->fs.sb);
ext4_fs_put_block_group_ref(&bg_ref);
}
ext4_sb_set_free_blocks_cnt(&mp->fs.sb, free_blocks_count);
ext4_set32(&mp->fs.sb, free_inodes_count, free_inodes_count);
/* We don't need to save the superblock stats immediately. */
}
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(s_mp[i].name, mount_point)) {
mp = &s_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;
if (fs->read_only && flags & O_CREAT)
return EROFS;
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;
if (mp->fs.read_only)
return EROFS;
/* 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;
if (mp->fs.read_only)
return EROFS;
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);
int ret;
if (!mp)
return ENOENT;
EXT4_MP_LOCK(mp);
ret = ext4_block_cache_write_back(mp->fs.bdev, on);
EXT4_MP_UNLOCK(mp);
return ret;
}
int ext4_cache_flush(const char *path)
{
struct ext4_mountpoint *mp = ext4_get_mount(path);
int ret;
if (!mp)
return ENOENT;
EXT4_MP_LOCK(mp);
ret = ext4_block_cache_flush(mp->fs.bdev);
EXT4_MP_UNLOCK(mp);
return ret;
}
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;
if (mp->fs.read_only)
return EROFS;
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->mp->fs.read_only)
return EROFS;
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->mp->fs.read_only)
return EROFS;
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;
}
static int ext4_trans_get_inode_ref(const char *path,
struct ext4_mountpoint *mp,
struct ext4_inode_ref *inode_ref)
{
int r;
ext4_file f;
ext4_trans_start(mp);
r = ext4_generic_open2(&f, path, O_RDWR, EXT4_DE_UNKNOWN, NULL, NULL);
if (r != EOK) {
ext4_trans_abort(mp);
return r;
}
r = ext4_fs_get_inode_ref(&mp->fs, f.inode, inode_ref);
if (r != EOK) {
ext4_trans_abort(mp);
return r;
}
return r;
}
static int ext4_trans_put_inode_ref(struct ext4_mountpoint *mp,
struct ext4_inode_ref *inode_ref)
{
int r;
r = ext4_fs_put_inode_ref(inode_ref);
if (r != EOK)
ext4_trans_abort(mp);
else
ext4_trans_stop(mp);
return r;
}
int ext4_mode_set(const char *path, uint32_t mode)
{
int r;
uint32_t orig_mode;
struct ext4_inode_ref inode_ref;
struct ext4_mountpoint *mp = ext4_get_mount(path);
if (!mp)
return ENOENT;
if (mp->fs.read_only)
return EROFS;
EXT4_MP_LOCK(mp);
r = ext4_trans_get_inode_ref(path, mp, &inode_ref);
if (r != EOK)
goto Finish;
orig_mode = ext4_inode_get_mode(&mp->fs.sb, inode_ref.inode);
orig_mode &= ~0xFFF;
orig_mode |= mode & 0xFFF;
ext4_inode_set_mode(&mp->fs.sb, inode_ref.inode, orig_mode);
inode_ref.dirty = true;
r = ext4_trans_put_inode_ref(mp, &inode_ref);
Finish:
EXT4_MP_UNLOCK(mp);
return r;
}
int ext4_owner_set(const char *path, uint32_t uid, uint32_t gid)
{
int r;
struct ext4_inode_ref inode_ref;
struct ext4_mountpoint *mp = ext4_get_mount(path);
if (!mp)
return ENOENT;
if (mp->fs.read_only)
return EROFS;
EXT4_MP_LOCK(mp);
r = ext4_trans_get_inode_ref(path, mp, &inode_ref);
if (r != EOK)
goto Finish;
ext4_inode_set_uid(inode_ref.inode, uid);
ext4_inode_set_gid(inode_ref.inode, gid);
inode_ref.dirty = true;
r = ext4_trans_put_inode_ref(mp, &inode_ref);
Finish:
EXT4_MP_UNLOCK(mp);
return r;
}
int ext4_mode_get(const char *path, uint32_t *mode)
{
struct ext4_inode_ref inode_ref;
struct ext4_mountpoint *mp = ext4_get_mount(path);
ext4_file f;
int r;
if (!mp)
return ENOENT;
EXT4_MP_LOCK(mp);
r = ext4_generic_open2(&f, path, O_RDONLY, EXT4_DE_UNKNOWN, NULL, NULL);
if (r != EOK)
goto Finish;
r = ext4_fs_get_inode_ref(&mp->fs, f.inode, &inode_ref);
if (r != EOK)
goto Finish;
*mode = ext4_inode_get_mode(&mp->fs.sb, inode_ref.inode);
r = ext4_fs_put_inode_ref(&inode_ref);
Finish:
EXT4_MP_UNLOCK(mp);
return r;
}
int ext4_owner_get(const char *path, uint32_t *uid, uint32_t *gid)
{
struct ext4_inode_ref inode_ref;
struct ext4_mountpoint *mp = ext4_get_mount(path);
ext4_file f;
int r;
if (!mp)
return ENOENT;
EXT4_MP_LOCK(mp);
r = ext4_generic_open2(&f, path, O_RDONLY, EXT4_DE_UNKNOWN, NULL, NULL);
if (r != EOK)
goto Finish;
r = ext4_fs_get_inode_ref(&mp->fs, f.inode, &inode_ref);
if (r != EOK)
goto Finish;
*uid = ext4_inode_get_uid(inode_ref.inode);
*gid = ext4_inode_get_gid(inode_ref.inode);
r = ext4_fs_put_inode_ref(&inode_ref);
Finish:
EXT4_MP_UNLOCK(mp);
return r;
}
int ext4_atime_set(const char *path, uint32_t atime)
{
struct ext4_inode_ref inode_ref;
struct ext4_mountpoint *mp = ext4_get_mount(path);
int r;
if (!mp)
return ENOENT;
if (mp->fs.read_only)
return EROFS;
EXT4_MP_LOCK(mp);
r = ext4_trans_get_inode_ref(path, mp, &inode_ref);
if (r != EOK)
goto Finish;
ext4_inode_set_access_time(inode_ref.inode, atime);
inode_ref.dirty = true;
r = ext4_trans_put_inode_ref(mp, &inode_ref);
Finish:
EXT4_MP_UNLOCK(mp);
return r;
}
int ext4_mtime_set(const char *path, uint32_t mtime)
{
struct ext4_inode_ref inode_ref;
struct ext4_mountpoint *mp = ext4_get_mount(path);
int r;
if (!mp)
return ENOENT;
if (mp->fs.read_only)
return EROFS;
EXT4_MP_LOCK(mp);
r = ext4_trans_get_inode_ref(path, mp, &inode_ref);
if (r != EOK)
goto Finish;
ext4_inode_set_modif_time(inode_ref.inode, mtime);
inode_ref.dirty = true;
r = ext4_trans_put_inode_ref(mp, &inode_ref);
Finish:
EXT4_MP_UNLOCK(mp);
return r;
}
int ext4_ctime_set(const char *path, uint32_t ctime)
{
struct ext4_inode_ref inode_ref;
struct ext4_mountpoint *mp = ext4_get_mount(path);
int r;
if (!mp)
return ENOENT;
if (mp->fs.read_only)
return EROFS;
EXT4_MP_LOCK(mp);
r = ext4_trans_get_inode_ref(path, mp, &inode_ref);
if (r != EOK)
goto Finish;
ext4_inode_set_change_inode_time(inode_ref.inode, ctime);
inode_ref.dirty = true;
r = ext4_trans_put_inode_ref(mp, &inode_ref);
Finish:
EXT4_MP_UNLOCK(mp);
return r;
}
int ext4_atime_get(const char *path, uint32_t *atime)
{
struct ext4_inode_ref inode_ref;
struct ext4_mountpoint *mp = ext4_get_mount(path);
ext4_file f;
int r;
if (!mp)
return ENOENT;
EXT4_MP_LOCK(mp);
r = ext4_generic_open2(&f, path, O_RDONLY, EXT4_DE_UNKNOWN, NULL, NULL);
if (r != EOK)
goto Finish;
r = ext4_fs_get_inode_ref(&mp->fs, f.inode, &inode_ref);
if (r != EOK)
goto Finish;
*atime = ext4_inode_get_access_time(inode_ref.inode);
r = ext4_fs_put_inode_ref(&inode_ref);
Finish:
EXT4_MP_UNLOCK(mp);
return r;
}
int ext4_mtime_get(const char *path, uint32_t *mtime)
{
struct ext4_inode_ref inode_ref;
struct ext4_mountpoint *mp = ext4_get_mount(path);
ext4_file f;
int r;
if (!mp)
return ENOENT;
EXT4_MP_LOCK(mp);
r = ext4_generic_open2(&f, path, O_RDONLY, EXT4_DE_UNKNOWN, NULL, NULL);
if (r != EOK)
goto Finish;
r = ext4_fs_get_inode_ref(&mp->fs, f.inode, &inode_ref);
if (r != EOK)
goto Finish;
*mtime = ext4_inode_get_modif_time(inode_ref.inode);
r = ext4_fs_put_inode_ref(&inode_ref);
Finish:
EXT4_MP_UNLOCK(mp);
return r;
}
int ext4_ctime_get(const char *path, uint32_t *ctime)
{
struct ext4_inode_ref inode_ref;
struct ext4_mountpoint *mp = ext4_get_mount(path);
ext4_file f;
int r;
if (!mp)
return ENOENT;
EXT4_MP_LOCK(mp);
r = ext4_generic_open2(&f, path, O_RDONLY, EXT4_DE_UNKNOWN, NULL, NULL);
if (r != EOK)
goto Finish;
r = ext4_fs_get_inode_ref(&mp->fs, f.inode, &inode_ref);
if (r != EOK)
goto Finish;
*ctime = ext4_inode_get_change_inode_time(inode_ref.inode);
r = ext4_fs_put_inode_ref(&inode_ref);
Finish:
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;
if (mp->fs.read_only)
return EROFS;
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;
}
static int ext4_mknod_set(ext4_file *f, uint32_t dev)
{
struct ext4_inode_ref ref;
int r;
ext4_assert(f && f->mp);
r = ext4_fs_get_inode_ref(&f->mp->fs, f->inode, &ref);
if (r != EOK)
return r;
ext4_inode_set_dev(ref.inode, dev);
ext4_inode_set_size(ref.inode, 0);
ref.dirty = true;
f->fsize = 0;
f->fpos = 0;
r = ext4_fs_put_inode_ref(&ref);
return r;
}
int ext4_mknod(const char *path, int filetype, uint32_t dev)
{
struct ext4_mountpoint *mp = ext4_get_mount(path);
int r;
ext4_file f;
if (!mp)
return ENOENT;
if (mp->fs.read_only)
return EROFS;
/*
* The filetype shouldn't be normal file, directory or
* unknown.
*/
if (filetype == EXT4_DE_UNKNOWN ||
filetype == EXT4_DE_REG_FILE ||
filetype == EXT4_DE_DIR ||
filetype == EXT4_DE_SYMLINK)
return EINVAL;
/*
* Nor should it be any bogus value.
*/
if (filetype != EXT4_DE_CHRDEV &&
filetype != EXT4_DE_BLKDEV &&
filetype != EXT4_DE_FIFO &&
filetype != EXT4_DE_SOCK)
return EINVAL;
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) {
if (filetype == EXT4_DE_CHRDEV ||
filetype == EXT4_DE_BLKDEV)
r = ext4_mknod_set(&f, dev);
} 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 __unused)
{
bool found;
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_inode_ref inode_ref;
struct ext4_mountpoint *mp = ext4_get_mount(path);
if (!mp)
return ENOENT;
if (mp->fs.read_only)
return EROFS;
dissected_name = ext4_extract_xattr_name(name, name_len,
&name_index, &dissected_len,
&found);
if (!found)
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_xattr_set(&inode_ref, name_index, dissected_name,
dissected_len, data, data_size);
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)
{
bool found;
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_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,
&found);
if (!found)
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_xattr_get(&inode_ref, name_index, dissected_name,
dissected_len, buf, buf_size, data_size);
ext4_fs_put_inode_ref(&inode_ref);
Finish:
EXT4_MP_UNLOCK(mp);
return r;
}
int ext4_listxattr(const char *path, char *list, size_t size, size_t *ret_size)
{
int r = EOK;
ext4_file f;
uint32_t inode;
size_t list_len, list_size = 0;
struct ext4_inode_ref inode_ref;
struct ext4_xattr_list_entry *xattr_list = NULL,
*entry = NULL;
struct ext4_mountpoint *mp = ext4_get_mount(path);
if (!mp)
return ENOENT;
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_xattr_list(&inode_ref, NULL, &list_len);
if (r == EOK && list_len) {
xattr_list = ext4_malloc(list_len);
if (!xattr_list) {
ext4_fs_put_inode_ref(&inode_ref);
r = ENOMEM;
goto Finish;
}
entry = xattr_list;
r = ext4_xattr_list(&inode_ref, entry, &list_len);
if (r != EOK) {
ext4_fs_put_inode_ref(&inode_ref);
goto Finish;
}
for (;entry;entry = entry->next) {
size_t prefix_len;
const char *prefix =
ext4_get_xattr_name_prefix(entry->name_index,
&prefix_len);
if (size) {
if (prefix_len + entry->name_len + 1 > size) {
ext4_fs_put_inode_ref(&inode_ref);
r = ERANGE;
goto Finish;
}
}
if (list && size) {
memcpy(list, prefix, prefix_len);
list += prefix_len;
memcpy(list, entry->name,
entry->name_len);
list[entry->name_len] = 0;
list += entry->name_len + 1;
size -= prefix_len + entry->name_len + 1;
}
list_size += prefix_len + entry->name_len + 1;
}
if (ret_size)
*ret_size = list_size;
}
ext4_fs_put_inode_ref(&inode_ref);
Finish:
EXT4_MP_UNLOCK(mp);
if (xattr_list)
ext4_free(xattr_list);
return r;
}
int ext4_removexattr(const char *path, const char *name, size_t name_len)
{
bool found;
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_inode_ref inode_ref;
struct ext4_mountpoint *mp = ext4_get_mount(path);
if (!mp)
return ENOENT;
if (mp->fs.read_only)
return EROFS;
dissected_name = ext4_extract_xattr_name(name, name_len,
&name_index, &dissected_len,
&found);
if (!found)
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_xattr_remove(&inode_ref, name_index, dissected_name,
dissected_len);
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;
if (mp->fs.read_only)
return EROFS;
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_mv(const char *path, const char *new_path)
{
return ext4_frename(path, new_path);
}
int ext4_dir_mk(const char *path)
{
int r;
ext4_file f;
struct ext4_mountpoint *mp = ext4_get_mount(path);
if (!mp)
return ENOENT;
if (mp->fs.read_only)
return EROFS;
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;
uint16_t name_length;
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;
}
memset(&d->de.name, 0, sizeof(d->de.name));
name_length = ext4_dir_en_get_name_len(&d->f.mp->fs.sb,
it.curr);
memcpy(&d->de.name, it.curr->name, name_length);
/* Directly copying the content isn't safe for Big-endian targets*/
d->de.inode = ext4_dir_en_get_inode(it.curr);
d->de.entry_length = ext4_dir_en_get_entry_len(it.curr);
d->de.name_length = name_length;
d->de.inode_type = ext4_dir_en_get_inode_type(&d->f.mp->fs.sb,
it.curr);
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;
}
/**
* @}
*/