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ext4.c
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/*
* Copyright (c) 2013 Grzegorz Kostka ([email protected])
* 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 cache.*/
struct ext4_bcache bc;
};
/**@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 EOK;
}
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 (!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);
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 = &mp->bc;
r = ext4_bcache_init_dynamic(bc, CONFIG_BLOCK_DEV_CACHE_SIZE, bsize);
if (r != EOK) {
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);
return r;
}
bd->fs = &mp->fs;
mp->mounted = 1;
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);
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)
{
for (size_t 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);
int r = ENOTSUP;
if (!mp)
return ENOENT;
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;
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;