ref: a3f2d6d23ed1be69fee607bdedadc0438fd01305
dir: /sys/src/cmd/ext4srv/ext4.c/
#include "ext4_config.h"
#include "ext4.h"
#include "ext4_trans.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_journal.h"
#include "ext4_crc32.h"
char Eexists[] = "file exists";
char Einval[] = "invalid operation";
char Eio[] = "i/o error";
char Enomem[] = "no memory";
char Enospc[] = "no space";
char Enotfound[] = "file not found";
char Eperm[] = "permission denied";
char Erdonlyfs[] = "read-only fs";
static char *
basename(char *s)
{
char *e;
e = utfrrune(s, '/');
return e == nil ? s : e+1;
}
/**@brief Mount point OS dependent lock*/
#define EXT4_MP_LOCK(_m) \
do { \
if ((_m)->os_locks) \
(_m)->os_locks->lock((_m)->os_locks->p_user); \
} while (0)
/**@brief Mount point OS dependent unlock*/
#define EXT4_MP_UNLOCK(_m) \
do { \
if ((_m)->os_locks) \
(_m)->os_locks->unlock((_m)->os_locks->p_user); \
} while (0)
static bool ext4_is_dots(const u8int *name, usize 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 0;
}
struct ext4_dir_iter it;
int rc = ext4_dir_iterator_init(&it, enode, 0);
if (rc != 0)
return rc;
/* Find a non-empty directory entry */
bool found = false;
while (it.curr != nil) {
if (ext4_dir_en_get_inode(it.curr) != 0) {
u16int 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 != 0) {
ext4_dir_iterator_fini(&it);
return rc;
}
}
rc = ext4_dir_iterator_fini(&it);
if (rc != 0)
return rc;
*has_children = found;
return 0;
}
static int ext4_link(struct ext4_mountpoint *mp, struct ext4_inode_ref *parent,
struct ext4_inode_ref *ch, const char *n,
u32int len, bool rename)
{
/* Check maximum name length */
if (len > EXT4_DIRECTORY_FILENAME_LEN) {
werrstr("entry name too long: %s", n);
return -1;
}
/* Add entry to parent directory */
int r = ext4_dir_add_entry(parent, n, len, ch);
if (r != 0)
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) {
/* Initialize directory index if supported */
if (ext4_sb_feature_com(&mp->fs.sb, EXT4_FCOM_DIR_INDEX)) {
ext4_inode_set_flag(ch->inode, EXT4_INODE_FLAG_INDEX);
r = ext4_dir_dx_init(ch, parent);
if (r != 0)
return r;
} else {
r = ext4_dir_add_entry(ch, ".", strlen("."), ch);
if (r != 0) {
ext4_dir_remove_entry(parent, n, strlen(n));
return r;
}
r = ext4_dir_add_entry(ch, "..", strlen(".."), parent);
if (r != 0) {
ext4_dir_remove_entry(parent, n, strlen(n));
ext4_dir_remove_entry(ch, ".", strlen("."));
return r;
}
}
/*New empty directory. Two links (. and ..) */
ext4_fs_inode_links_count_inc(parent);
ext4_inode_set_links_cnt(ch->inode, 2);
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 != 0) {
werrstr(Eio);
return -1;
}
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 != 0)
return r;
} else {
r = ext4_dir_dx_reset_parent_inode(ch, parent->index);
if (r != 0)
return r;
}
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)
{
bool has_children;
int rc = ext4_has_children(&has_children, child);
if (rc != 0)
return rc;
/* Cannot unlink non-empty node */
if (has_children) {
werrstr("remove -- directory not empty");
return -1;
}
/* Remove entry from parent directory */
name = basename(name);
rc = ext4_dir_remove_entry(parent, name, strlen(name));
if (rc != 0)
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, (u32int) now);
* ext4_inode_set_modification_time(parent->inode, (u32int) now);
* parent->dirty = true;
*/
/*
* TODO: Update timestamp for inode.
*
* ext4_inode_set_change_inode_time(child->inode,
* (u32int) now);
*/
if (ext4_inode_get_links_cnt(child->inode)) {
ext4_fs_inode_links_count_dec(child);
child->dirty = true;
}
return 0;
}
int ext4_mount(struct ext4_mountpoint *mp, struct ext4_blockdev *bd, bool read_only)
{
int r;
u32int bsize;
struct ext4_bcache *bc;
memset(mp, 0, sizeof(*mp));
ext4_crc32_init();
r = ext4_block_init(bd);
if (r != 0)
return r;
r = ext4_fs_init(&mp->fs, bd, read_only);
if (r != 0) {
err:
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 != 0)
goto err;
if (bsize != bc->itemsize) {
werrstr("unsupported block size: %d", bsize);
ext4_bcache_fini_dynamic(bc);
goto err;
}
/*Bind block cache to block device*/
r = ext4_block_bind_bcache(bd, bc);
if (r != 0) {
ext4_bcache_cleanup(bc);
ext4_bcache_fini_dynamic(bc);
goto err;
}
bd->fs = &mp->fs;
mp->mounted = true;
return r;
}
int ext4_umount(struct ext4_mountpoint *mp)
{
int r;
r = ext4_fs_fini(&mp->fs);
if (r != 0)
goto Finish;
mp->mounted = false;
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 = nil;
return r;
}
int ext4_journal_start(struct ext4_mountpoint *mp)
{
int r;
if (mp->fs.read_only)
return 0;
if (!ext4_sb_feature_com(&mp->fs.sb, EXT4_FCOM_HAS_JOURNAL))
return 0;
r = jbd_get_fs(&mp->fs, &mp->jbd_fs);
if (r != 0)
goto Finish;
r = jbd_journal_start(&mp->jbd_fs, &mp->jbd_journal);
if (r != 0) {
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;
}
int ext4_journal_stop(struct ext4_mountpoint *mp)
{
int r;
if (mp->fs.read_only)
return 0;
if (!ext4_sb_feature_com(&mp->fs.sb, EXT4_FCOM_HAS_JOURNAL))
return 0;
r = jbd_journal_stop(&mp->jbd_journal);
if (r != 0) {
mp->jbd_fs.dirty = false;
jbd_put_fs(&mp->jbd_fs);
mp->fs.jbd_journal = nil;
mp->fs.jbd_fs = nil;
goto Finish;
}
r = jbd_put_fs(&mp->jbd_fs);
if (r != 0) {
mp->fs.jbd_journal = nil;
mp->fs.jbd_fs = nil;
goto Finish;
}
mp->fs.jbd_journal = nil;
mp->fs.jbd_fs = nil;
Finish:
return r;
}
int ext4_recover(struct ext4_mountpoint *mp)
{
int r;
EXT4_MP_LOCK(mp);
if (!ext4_sb_feature_com(&mp->fs.sb, EXT4_FCOM_HAS_JOURNAL)){
r = 0;
goto Finish;
}
struct jbd_fs *jbd_fs = ext4_calloc(1, sizeof(struct jbd_fs));
if (!jbd_fs) {
werrstr("memory");
r = -1;
goto Finish;
}
r = jbd_get_fs(&mp->fs, jbd_fs);
if (r != 0) {
ext4_free(jbd_fs);
goto Finish;
}
r = jbd_recover(jbd_fs);
jbd_put_fs(jbd_fs);
ext4_free(jbd_fs);
if (r == 0 && !mp->fs.read_only) {
u32int bgid;
u64int free_blocks_count = 0;
u32int 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 != 0)
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;
}
int ext4_trans_start(struct ext4_mountpoint *mp)
{
int r = 0;
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) {
werrstr("memory");
r = -1;
goto Finish;
}
mp->fs.curr_trans = trans;
}
Finish:
return r;
}
int ext4_trans_stop(struct ext4_mountpoint *mp)
{
int r = 0;
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 = nil;
}
return r;
}
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 = nil;
}
}
int ext4_mount_point_stats(struct ext4_mountpoint *mp,
struct ext4_mount_stats *stats)
{
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 0;
}
int ext4_mount_setup_locks(struct ext4_mountpoint *mp,
const struct ext4_lock *locks)
{
mp->os_locks = locks;
return 0;
}
/********************************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, u32int *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,
u32int index, u64int new_size)
{
int r;
struct ext4_fs *const fs = &mp->fs;
struct ext4_inode_ref inode_ref;
u64int 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 != 0)
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 != 0) {
ext4_trans_abort(mp);
break;
}
r = ext4_fs_truncate_inode(&inode_ref, inode_size);
if (r != 0)
ext4_fs_put_inode_ref(&inode_ref);
else
r = ext4_fs_put_inode_ref(&inode_ref);
if (r != 0) {
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 != 0) {
ext4_trans_abort(mp);
goto Finish;
}
r = ext4_fs_truncate_inode(&inode_ref, inode_size);
if (r != 0)
ext4_fs_put_inode_ref(&inode_ref);
else
r = ext4_fs_put_inode_ref(&inode_ref);
if (r != 0)
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;
bool is_dir = ext4_inode_is_type(&mp->fs.sb, dir->inode,
EXT4_INODE_MODE_DIRECTORY);
u32int block_size = ext4_sb_get_block_size(&mp->fs.sb);
if (!is_dir) {
werrstr("not a directory");
return -1;
}
/* 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 != 0)
return r;
r = ext4_trunc_inode(mp, dir->index,
EXT4_DIR_DX_INIT_BCNT * block_size);
if (r != 0)
return r;
} else {
r = ext4_trunc_inode(mp, dir->index, block_size);
if (r != 0)
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(struct ext4_mountpoint *mp,
ext4_file *f, const char *path, int flags,
int ftype, u32int *parent_inode)
{
bool is_goal = false;
u32int imode = EXT4_INODE_MODE_DIRECTORY;
u32int next_inode;
int r;
int len;
struct ext4_dir_search_result result;
struct ext4_inode_ref ref;
f->mp = 0;
struct ext4_fs *const fs = &mp->fs;
struct ext4_sblock *const sb = &mp->fs.sb;
if (fs->read_only && flags & O_CREAT) {
werrstr(Erdonlyfs);
return -1;
}
f->flags = flags;
/*Load root*/
r = ext4_fs_get_inode_ref(fs, EXT4_INODE_ROOT_INDEX, &ref);
if (r != 0)
return r;
if (parent_inode)
*parent_inode = ref.index;
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;
Notfound:
werrstr(Enotfound);
r = -1;
break;
}
r = ext4_dir_find_entry(&result, &ref, path, len);
if (r != 0) {
/*Destroy last result*/
ext4_dir_destroy_result(&ref, &result);
if (r != EXT4_ERR_NOT_FOUND)
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 != 0)
break;
ext4_fs_inode_blocks_init(fs, &child_ref);
/*Link with root dir.*/
r = ext4_link(mp, &ref, &child_ref, path, len, false);
if (r != 0) {
/*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)) {
u8int 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 != 0)
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 != 0)
break;
/*If expected file error*/
if (imode != EXT4_INODE_MODE_DIRECTORY && !is_goal)
goto Notfound;
if (ftype != EXT4_DE_UNKNOWN) {
bool df = imode != ext4_fs_correspond_inode_mode(ftype);
if (df && is_goal)
goto Notfound;
}
r = ext4_fs_put_inode_ref(&ref);
if (r != 0)
break;
r = ext4_fs_get_inode_ref(fs, next_inode, &ref);
if (r != 0)
break;
if (is_goal)
break;
path += len + 1;
}
if (r != 0) {
ext4_fs_put_inode_ref(&ref);
return r;
}
if (is_goal) {
if (f->flags != O_RDONLY && !ext4_inode_can_truncate(sb, ref.inode))
f->flags |= O_APPEND;
if ((f->flags & (O_TRUNC|O_APPEND)) == O_TRUNC && imode == EXT4_INODE_MODE_FILE) {
r = ext4_trunc_inode(mp, ref.index, 0);
if (r != 0) {
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 = (f->flags & O_APPEND) ? f->fsize : 0;
}
return ext4_fs_put_inode_ref(&ref);
}
/****************************************************************************/
static int ext4_generic_open(struct ext4_mountpoint *mp,
ext4_file *f, const char *path, const char *flags,
bool file_expect, u32int *parent_inode)
{
u32int iflags;
int filetype;
int r;
if (ext4_parse_flags(flags, &iflags) == false)
return -1;
if (file_expect == true)
filetype = EXT4_DE_REG_FILE;
else
filetype = EXT4_DE_DIR;
if (iflags & O_CREAT)
ext4_trans_start(mp);
r = ext4_generic_open2(mp, f, path, iflags, filetype, parent_inode);
if (iflags & O_CREAT) {
if (r == 0)
ext4_trans_stop(mp);
else
ext4_trans_abort(mp);
}
return r;
}
static int ext4_create_hardlink(struct ext4_mountpoint *mp,
const char *path,
struct ext4_inode_ref *child_ref, bool rename)
{
bool is_goal = false;
u32int inode_mode;
u32int next_inode;
int r;
int len;
struct ext4_dir_search_result result;
struct ext4_inode_ref ref;
struct ext4_fs *const fs = &mp->fs;
struct ext4_sblock *const sb = &mp->fs.sb;
/*Load root*/
r = ext4_fs_get_inode_ref(fs, EXT4_INODE_ROOT_INDEX, &ref);
if (r != 0)
return r;
while (1) {
len = ext4_path_check(path, &is_goal);
if (!len) {
/*If root open was request.*/
werrstr(Enotfound);
r = -1;
break;
}
r = ext4_dir_find_entry(&result, &ref, path, len);
if (r != 0) {
/*Destroy last result*/
ext4_dir_destroy_result(&ref, &result);
if (r != EXT4_ERR_NOT_FOUND || !is_goal)
break;
/*Link with root dir.*/
r = ext4_link(mp, &ref, child_ref, path, len, rename);
break;
} else if (r == 0 && is_goal) {
/*Destroy last result*/
ext4_dir_destroy_result(&ref, &result);
werrstr(Eexists);
r = -1;
break;
}
next_inode = result.dentry->inode;
if (ext4_sb_feature_incom(sb, EXT4_FINCOM_FILETYPE)) {
u8int 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 != 0)
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 != 0)
break;
if (inode_mode != EXT4_INODE_MODE_DIRECTORY) {
werrstr(is_goal ? Eexists : Enotfound);
r = -1;
break;
}
r = ext4_fs_put_inode_ref(&ref);
if (r != 0)
break;
r = ext4_fs_get_inode_ref(fs, next_inode, &ref);
if (r != 0)
break;
if (is_goal)
break;
path += len + 1;
};
if (r != 0) {
ext4_fs_put_inode_ref(&ref);
return r;
}
r = ext4_fs_put_inode_ref(&ref);
return r;
}
static int ext4_remove_orig_reference(struct ext4_mountpoint *mp,
const char *path,
struct ext4_inode_ref *parent_ref,
struct ext4_inode_ref *child_ref)
{
int r;
/* Remove entry from parent directory */
r = ext4_dir_remove_entry(parent_ref, path, strlen(path));
if (r != 0)
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(struct ext4_mountpoint *mp, const char *path, const char *hardlink_path)
{
int r;
ext4_file f;
bool child_loaded = false;
u32int parent_inode, child_inode;
struct ext4_inode_ref child_ref;
if (mp->fs.read_only) {
werrstr(Erdonlyfs);
return -1;
}
EXT4_MP_LOCK(mp);
r = ext4_generic_open2(mp, &f, path, O_RDONLY, EXT4_DE_UNKNOWN, &parent_inode);
if (r != 0) {
EXT4_MP_UNLOCK(mp);
return r;
}
child_inode = f.inode;
ext4_fclose(&f);
ext4_trans_start(mp);
/*We have file to unlink. Load it.*/
r = ext4_fs_get_inode_ref(&mp->fs, child_inode, &child_ref);
if (r != 0)
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)) {
werrstr("is a directory");
r = -1;
goto Finish;
}
r = ext4_create_hardlink(mp, hardlink_path, &child_ref, false);
Finish:
if (child_loaded)
ext4_fs_put_inode_ref(&child_ref);
if (r != 0)
ext4_trans_abort(mp);
else
ext4_trans_stop(mp);
EXT4_MP_UNLOCK(mp);
return r;
}
int ext4_frename(struct ext4_mountpoint *mp, const char *path, const char *new_path)
{
int r;
ext4_file f;
bool parent_loaded = false, child_loaded = false;
u32int parent_inode, child_inode;
struct ext4_inode_ref child_ref, parent_ref;
if (mp->fs.read_only) {
werrstr(Erdonlyfs);
return -1;
}
EXT4_MP_LOCK(mp);
r = ext4_generic_open2(mp, &f, path, O_RDONLY, EXT4_DE_UNKNOWN, &parent_inode);
if (r != 0) {
EXT4_MP_UNLOCK(mp);
return r;
}
child_inode = f.inode;
ext4_fclose(&f);
ext4_trans_start(mp);
/*Load parent*/
r = ext4_fs_get_inode_ref(&mp->fs, parent_inode, &parent_ref);
if (r != 0)
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 != 0)
goto Finish;
child_loaded = true;
r = ext4_create_hardlink(mp, new_path, &child_ref, true);
if (r != 0)
goto Finish;
r = ext4_remove_orig_reference(mp, basename(path), &parent_ref, &child_ref);
if (r != 0)
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 != 0)
ext4_trans_abort(mp);
else
ext4_trans_stop(mp);
EXT4_MP_UNLOCK(mp);
return r;
}
/****************************************************************************/
int ext4_get_sblock(struct ext4_mountpoint *mp, struct ext4_sblock **sb)
{
*sb = &mp->fs.sb;
return 0;
}
int ext4_cache_write_back(struct ext4_mountpoint *mp, bool on)
{
int ret;
EXT4_MP_LOCK(mp);
ret = ext4_block_cache_write_back(mp->fs.bdev, on);
EXT4_MP_UNLOCK(mp);
return ret;
}
int ext4_cache_flush(struct ext4_mountpoint *mp)
{
int ret;
EXT4_MP_LOCK(mp);
ret = ext4_block_cache_flush(mp->fs.bdev);
EXT4_MP_UNLOCK(mp);
return ret;
}
int ext4_fremove(struct ext4_mountpoint *mp, const char *path)
{
ext4_file f;
u32int parent_inode;
u32int child_inode;
int r;
struct ext4_inode_ref child;
struct ext4_inode_ref parent;
if (mp->fs.read_only) {
werrstr(Erdonlyfs);
return -1;
}
EXT4_MP_LOCK(mp);
r = ext4_generic_open2(mp, &f, path, O_RDONLY, EXT4_DE_UNKNOWN, &parent_inode);
if (r != 0) {
EXT4_MP_UNLOCK(mp);
return r;
}
child_inode = f.inode;
ext4_fclose(&f);
ext4_trans_start(mp);
/*Load parent*/
r = ext4_fs_get_inode_ref(&mp->fs, parent_inode, &parent);
if (r != 0) {
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, child_inode, &child);
if (r != 0) {
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);
ext4_inode_clear_flag(child.inode, EXT4_INODE_FLAG_APPEND);
r = ext4_trunc_inode(mp, child.index, 0);
if (r != 0) {
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);
}
/*Unlink from parent*/
r = ext4_unlink(mp, &parent, &child, path);
if (r != 0)
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 != 0)
goto Finish;
}
Finish:
ext4_fs_put_inode_ref(&child);
ext4_fs_put_inode_ref(&parent);
if (r != 0)
ext4_trans_abort(mp);
else
ext4_trans_stop(mp);
EXT4_MP_UNLOCK(mp);
return r;
}
int ext4_fopen(struct ext4_mountpoint *mp, ext4_file *file, const char *path, const char *flags)
{
int r;
EXT4_MP_LOCK(mp);
ext4_block_cache_write_back(mp->fs.bdev, 1);
r = ext4_generic_open(mp, file, path, flags, true, nil);
ext4_block_cache_write_back(mp->fs.bdev, 0);
EXT4_MP_UNLOCK(mp);
return r;
}
int ext4_fopen2(struct ext4_mountpoint *mp, ext4_file *file, const char *path, int flags)
{
int r;
int filetype;
filetype = EXT4_DE_REG_FILE;
EXT4_MP_LOCK(mp);
ext4_block_cache_write_back(mp->fs.bdev, 1);
if (flags & O_CREAT)
ext4_trans_start(mp);
r = ext4_generic_open2(mp, file, path, flags, filetype, nil);
if (flags & O_CREAT) {
if (r == 0)
ext4_trans_stop(mp);
else
ext4_trans_abort(mp);
}
ext4_block_cache_write_back(mp->fs.bdev, 0);
EXT4_MP_UNLOCK(mp);
return r;
}
int ext4_fclose(ext4_file *file)
{
assert(file && file->mp);
file->mp = 0;
file->flags = 0;
file->inode = 0;
file->fpos = 0;
file->fsize = 0;
return 0;
}
static int ext4_ftruncate_no_lock(ext4_file *file, u64int size)
{
struct ext4_inode_ref ref;
int r;
r = ext4_fs_get_inode_ref(&file->mp->fs, file->inode, &ref);
if (r != 0) {
EXT4_MP_UNLOCK(file->mp);
return r;
}
/*Sync file size*/
file->fsize = ext4_inode_get_size(&file->mp->fs.sb, ref.inode);
if (file->fsize <= size) {
werrstr("space preallocation not supported");
r = -1;
goto Finish;
}
/*Start write back cache mode.*/
r = ext4_block_cache_write_back(file->mp->fs.bdev, 1);
if (r != 0)
goto Finish;
r = ext4_trunc_inode(file->mp, ref.index, size);
if (r != 0)
goto Finish;
file->fsize = size;
if (file->fpos > size)
file->fpos = size;
/*Stop write back cache mode*/
ext4_block_cache_write_back(file->mp->fs.bdev, 0);
if (r != 0)
goto Finish;
Finish:
ext4_fs_put_inode_ref(&ref);
return r;
}
int ext4_ftruncate(ext4_file *f, u64int size)
{
int r;
assert(f && f->mp);
if (f->mp->fs.read_only) {
werrstr(Erdonlyfs);
return -1;
}
if ((f->flags & O_WRMASK) == 0) {
werrstr(Eperm);
return -1;
}
EXT4_MP_LOCK(f->mp);
ext4_trans_start(f->mp);
r = ext4_ftruncate_no_lock(f, size);
if( r == 0 )
ext4_trans_stop(f->mp);
else
ext4_trans_abort(f->mp);
EXT4_MP_UNLOCK(f->mp);
return r;
}
int ext4_fread(ext4_file *file, void *buf, usize size, usize *rcnt)
{
u32int unalg;
u32int iblock_idx;
u32int iblock_last;
u32int block_size;
ext4_fsblk_t fblock;
ext4_fsblk_t fblock_start;
u32int fblock_count;
u8int *u8_buf = buf;
int r;
struct ext4_inode_ref ref;
assert(file && file->mp);
if (file->flags & O_WRONLY) {
werrstr(Eperm);
return -1;
}
if (!size)
return 0;
EXT4_MP_LOCK(file->mp);
struct ext4_fs *const fs = &file->mp->fs;
struct ext4_sblock *const sb = &file->mp->fs.sb;
if (rcnt)
*rcnt = 0;
r = ext4_fs_get_inode_ref(fs, file->inode, &ref);
if (r != 0) {
EXT4_MP_UNLOCK(file->mp);
return r;
}
/*Sync file size*/
file->fsize = ext4_inode_get_size(sb, ref.inode);
block_size = ext4_sb_get_block_size(sb);
size = ((u64int)size > (file->fsize - file->fpos))
? ((usize)(file->fsize - file->fpos)) : size;
iblock_idx = (u32int)((file->fpos) / block_size);
iblock_last = (u32int)((file->fpos + size) / block_size);
unalg = (file->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 && file->fsize < sizeof(ref.inode->blocks)
&& !ext4_inode_get_blocks_count(sb, ref.inode)) {
char *content = (char *)ref.inode->blocks;
if (file->fpos < file->fsize) {
usize len = size;
if (unalg + size > (u32int)file->fsize)
len = (u32int)file->fsize - unalg;
memcpy(buf, content + unalg, len);
if (rcnt)
*rcnt = len;
}
r = 0;
goto Finish;
}
if (unalg) {
usize 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 != 0)
goto Finish;
/* Do we get an unwritten range? */
if (fblock != 0) {
u64int off = fblock * block_size + unalg;
r = ext4_block_readbytes(file->mp->fs.bdev, off, u8_buf, len);
if (r != 0)
goto Finish;
} else {
/* Yes, we do. */
memset(u8_buf, 0, len);
}
u8_buf += len;
size -= len;
file->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 != 0)
goto Finish;
iblock_idx++;
if (!fblock_start)
fblock_start = fblock;
if ((fblock_start + fblock_count) != fblock)
break;
fblock_count++;
}
r = ext4_blocks_get_direct(file->mp->fs.bdev, u8_buf, fblock_start,
fblock_count);
if (r != 0)
goto Finish;
size -= block_size * fblock_count;
u8_buf += block_size * fblock_count;
file->fpos += block_size * fblock_count;
if (rcnt)
*rcnt += block_size * fblock_count;
fblock_start = fblock;
fblock_count = 1;
}
if (size) {
u64int off;
r = ext4_fs_get_inode_dblk_idx(&ref, iblock_idx, &fblock, true);
if (r != 0)
goto Finish;
off = fblock * block_size;
r = ext4_block_readbytes(file->mp->fs.bdev, off, u8_buf, size);
if (r != 0)
goto Finish;
file->fpos += size;
if (rcnt)
*rcnt += size;
}
Finish:
ext4_fs_put_inode_ref(&ref);
EXT4_MP_UNLOCK(file->mp);
return r;
}
int ext4_fwrite(ext4_file *file, const void *buf, usize size, usize *wcnt)
{
u32int unalg;
u32int iblk_idx;
u32int iblock_last;
u32int ifile_blocks;
u32int block_size;
u32int fblock_count;
ext4_fsblk_t fblk;
ext4_fsblk_t fblock_start;
struct ext4_inode_ref ref;
const u8int *u8_buf = buf;
int r, rr = 0;
assert(file && file->mp);
if(wcnt)
*wcnt = 0;
if (file->mp->fs.read_only) {
werrstr(Erdonlyfs);
return -1;
}
if ((file->flags & O_WRMASK) == 0) {
werrstr(Eperm);
return -1;
}
if (!size)
return 0;
EXT4_MP_LOCK(file->mp);
ext4_trans_start(file->mp);
struct ext4_fs *const fs = &file->mp->fs;
struct ext4_sblock *const sb = &file->mp->fs.sb;
r = ext4_fs_get_inode_ref(fs, file->inode, &ref);
if (r != 0) {
ext4_trans_abort(file->mp);
EXT4_MP_UNLOCK(file->mp);
return r;
}
/*Sync file size*/
file->fsize = ext4_inode_get_size(sb, ref.inode);
block_size = ext4_sb_get_block_size(sb);
iblock_last = (file->fpos + size) / block_size;
iblk_idx = file->fpos / block_size;
ifile_blocks = (file->fsize + block_size - 1) / block_size;
unalg = file->fpos % block_size;
if (unalg) {
usize len = size;
u64int off;
if (size > (block_size - unalg))
len = block_size - unalg;
r = ext4_fs_init_inode_dblk_idx(&ref, iblk_idx, &fblk);
if (r != 0)
goto Finish;
off = fblk * block_size + unalg;
r = ext4_block_writebytes(file->mp->fs.bdev, off, u8_buf, len);
if (r != 0)
goto Finish;
u8_buf += len;
size -= len;
file->fpos += len;
if (wcnt)
*wcnt += len;
iblk_idx++;
}
/*Start write back cache mode.*/
r = ext4_block_cache_write_back(file->mp->fs.bdev, 1);
if (r != 0)
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 != 0)
goto Finish;
} else {
rr = ext4_fs_append_inode_dblk(&ref, &fblk,
&iblk_idx);
if (rr != 0) {
/* 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(file->mp->fs.bdev, u8_buf, fblock_start,
fblock_count);
if (r != 0)
break;
size -= block_size * fblock_count;
u8_buf += block_size * fblock_count;
file->fpos += block_size * fblock_count;
if (wcnt)
*wcnt += block_size * fblock_count;
fblock_start = fblk;
fblock_count = 1;
if (rr != 0) {
/*ext4_fs_append_inode_block has failed and no
* more blocks might be written. But node size
* should be updated.*/
/* FIXME wth is happening here exactly? */
//r = rr;
goto out_fsize;
}
}
/*Stop write back cache mode*/
ext4_block_cache_write_back(file->mp->fs.bdev, 0);
if (r != 0)
goto Finish;
if (size) {
u64int off;
if (iblk_idx < ifile_blocks) {
r = ext4_fs_init_inode_dblk_idx(&ref, iblk_idx, &fblk);
if (r != 0)
goto Finish;
} else {
r = ext4_fs_append_inode_dblk(&ref, &fblk, &iblk_idx);
if (r != 0)
/*Node size sholud be updated.*/
goto out_fsize;
}
off = fblk * block_size;
r = ext4_block_writebytes(file->mp->fs.bdev, off, u8_buf, size);
if (r != 0)
goto Finish;
file->fpos += size;
if (wcnt)
*wcnt += size;
}
out_fsize:
if (file->fpos > file->fsize) {
file->fsize = file->fpos;
ext4_inode_set_size(ref.inode, file->fsize);
ref.dirty = true;
}
Finish:
if(r == 0)
ext4_inode_set_modif_time(ref.inode, time(nil));
ext4_fs_put_inode_ref(&ref);
if (r != 0)
ext4_trans_abort(file->mp);
else
ext4_trans_stop(file->mp);
EXT4_MP_UNLOCK(file->mp);
return r;
}
int ext4_fseek(ext4_file *file, s64int offset, int origin)
{
switch (origin) {
case 2:
offset += file->fsize;
if(0){
case 1:
offset += file->fpos;
/* slippery slope */
}
case 0:
if(offset < 0)
offset = 0;
else if(offset > file->fsize)
offset = file->fsize;
file->fpos = offset;
break;
}
return 0;
}
u64int ext4_ftell(ext4_file *file)
{
return file->fpos;
}
u64int ext4_fsize(ext4_file *file)
{
return file->fsize;
}
static int ext4_trans_get_inode_ref(struct ext4_mountpoint *mp,
const char *path,
struct ext4_inode_ref *inode_ref)
{
int r;
ext4_file f;
r = ext4_generic_open2(mp, &f, path, O_RDONLY, EXT4_DE_UNKNOWN, nil);
if (r != 0)
return r;
ext4_trans_start(mp);
r = ext4_fs_get_inode_ref(&mp->fs, f.inode, inode_ref);
if (r != 0) {
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 != 0)
ext4_trans_abort(mp);
else
ext4_trans_stop(mp);
return r;
}
int ext4_raw_inode_fill(struct ext4_mountpoint *mp,
const char *path, u32int *ret_ino,
struct ext4_inode *inode)
{
int r;
ext4_file f;
struct ext4_inode_ref inode_ref;
EXT4_MP_LOCK(mp);
r = ext4_generic_open2(mp, &f, path, O_RDONLY, EXT4_DE_UNKNOWN, nil);
if (r != 0) {
EXT4_MP_UNLOCK(mp);
return r;
}
/*Load parent*/
r = ext4_fs_get_inode_ref(&mp->fs, f.inode, &inode_ref);
if (r != 0) {
EXT4_MP_UNLOCK(mp);
return r;
}
if (ret_ino)
*ret_ino = f.inode;
if (inode)
memcpy(inode, inode_ref.inode, sizeof(struct ext4_inode));
ext4_fs_put_inode_ref(&inode_ref);
EXT4_MP_UNLOCK(mp);
return r;
}
int ext4_inode_exist(struct ext4_mountpoint *mp, const char *path, int type)
{
int r;
ext4_file f;
EXT4_MP_LOCK(mp);
r = ext4_generic_open2(mp, &f, path, O_RDONLY, type, nil);
EXT4_MP_UNLOCK(mp);
return r;
}
int ext4_mode_set(struct ext4_mountpoint *mp, const char *path, u32int mode, u32int iflags)
{
int r;
u32int orig_mode;
struct ext4_inode_ref inode_ref;
if (mp->fs.read_only) {
werrstr(Erdonlyfs);
return -1;
}
EXT4_MP_LOCK(mp);
r = ext4_trans_get_inode_ref(mp, path, &inode_ref);
if (r != 0)
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);
iflags &= EXT4_INODE_FLAG_APPEND | EXT4_INODE_FLAG_NODUMP;
ext4_inode_set_flag(inode_ref.inode, iflags);
iflags ^= EXT4_INODE_FLAG_APPEND | EXT4_INODE_FLAG_NODUMP;
ext4_inode_clear_flag(inode_ref.inode, iflags);
inode_ref.dirty = true;
r = ext4_trans_put_inode_ref(mp, &inode_ref);
Finish:
EXT4_MP_UNLOCK(mp);
return r;
}
int ext4_owner_set(struct ext4_mountpoint *mp, const char *path, u32int uid, u32int gid)
{
int r;
struct ext4_inode_ref inode_ref;
if (mp->fs.read_only) {
werrstr(Erdonlyfs);
return -1;
}
EXT4_MP_LOCK(mp);
r = ext4_trans_get_inode_ref(mp, path, &inode_ref);
if (r != 0)
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(struct ext4_mountpoint *mp, const char *path, u32int *mode)
{
struct ext4_inode_ref inode_ref;
ext4_file f;
int r;
EXT4_MP_LOCK(mp);
r = ext4_generic_open2(mp, &f, path, O_RDONLY, EXT4_DE_UNKNOWN, nil);
if (r != 0)
goto Finish;
r = ext4_fs_get_inode_ref(&mp->fs, f.inode, &inode_ref);
if (r != 0)
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(struct ext4_mountpoint *mp, const char *path, u32int *uid, u32int *gid)
{
struct ext4_inode_ref inode_ref;
ext4_file f;
int r;
EXT4_MP_LOCK(mp);
r = ext4_generic_open2(mp, &f, path, O_RDONLY, EXT4_DE_UNKNOWN, nil);
if (r != 0)
goto Finish;
r = ext4_fs_get_inode_ref(&mp->fs, f.inode, &inode_ref);
if (r != 0)
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(struct ext4_mountpoint *mp, const char *path, u32int atime)
{
struct ext4_inode_ref inode_ref;
int r;
if (mp->fs.read_only) {
werrstr(Erdonlyfs);
return -1;
}
EXT4_MP_LOCK(mp);
r = ext4_trans_get_inode_ref(mp, path, &inode_ref);
if (r != 0)
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(struct ext4_mountpoint *mp, const char *path, u32int mtime)
{
struct ext4_inode_ref inode_ref;
int r;
if (mp->fs.read_only) {
werrstr(Erdonlyfs);
return -1;
}
EXT4_MP_LOCK(mp);
r = ext4_trans_get_inode_ref(mp, path, &inode_ref);
if (r != 0)
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(struct ext4_mountpoint *mp, const char *path, u32int ctime)
{
struct ext4_inode_ref inode_ref;
int r;
if (mp->fs.read_only) {
werrstr(Erdonlyfs);
return -1;
}
EXT4_MP_LOCK(mp);
r = ext4_trans_get_inode_ref(mp, path, &inode_ref);
if (r != 0)
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(struct ext4_mountpoint *mp, const char *path, u32int *atime)
{
struct ext4_inode_ref inode_ref;
ext4_file f;
int r;
EXT4_MP_LOCK(mp);
r = ext4_generic_open2(mp, &f, path, O_RDONLY, EXT4_DE_UNKNOWN, nil);
if (r != 0)
goto Finish;
r = ext4_fs_get_inode_ref(&mp->fs, f.inode, &inode_ref);
if (r != 0)
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(struct ext4_mountpoint *mp, const char *path, u32int *mtime)
{
struct ext4_inode_ref inode_ref;
ext4_file f;
int r;
EXT4_MP_LOCK(mp);
r = ext4_generic_open2(mp, &f, path, O_RDONLY, EXT4_DE_UNKNOWN, nil);
if (r != 0)
goto Finish;
r = ext4_fs_get_inode_ref(&mp->fs, f.inode, &inode_ref);
if (r != 0)
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(struct ext4_mountpoint *mp, const char *path, u32int *ctime)
{
struct ext4_inode_ref inode_ref;
ext4_file f;
int r;
EXT4_MP_LOCK(mp);
r = ext4_generic_open2(mp, &f, path, O_RDONLY, EXT4_DE_UNKNOWN, nil);
if (r != 0)
goto Finish;
r = ext4_fs_get_inode_ref(&mp->fs, f.inode, &inode_ref);
if (r != 0)
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, u32int size)
{
struct ext4_inode_ref ref;
u32int sblock;
ext4_fsblk_t fblock;
u32int block_size;
int r;
assert(f && f->mp);
if (!size)
return 0;
r = ext4_fs_get_inode_ref(&f->mp->fs, f->inode, &ref);
if (r != 0)
return r;
/*Sync file size*/
block_size = ext4_sb_get_block_size(&f->mp->fs.sb);
if (size > block_size) {
werrstr("invalid block size");
r = -1;
goto Finish;
}
r = ext4_ftruncate_no_lock(f, 0);
if (r != 0)
goto Finish;
/*Start write back cache mode.*/
r = ext4_block_cache_write_back(f->mp->fs.bdev, 1);
if (r != 0)
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 {
u64int off;
ext4_fs_inode_blocks_init(&f->mp->fs, &ref);
r = ext4_fs_append_inode_dblk(&ref, &fblock, &sblock);
if (r != 0)
goto Finish;
off = fblock * block_size;
r = ext4_block_writebytes(f->mp->fs.bdev, off, buf, size);
if (r != 0)
goto Finish;
}
/*Stop write back cache mode*/
ext4_block_cache_write_back(f->mp->fs.bdev, 0);
if (r != 0)
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(struct ext4_mountpoint *mp, const char *target, const char *path)
{
int r;
ext4_file f;
int filetype;
if (mp->fs.read_only) {
werrstr(Erdonlyfs);
return -1;
}
filetype = EXT4_DE_SYMLINK;
EXT4_MP_LOCK(mp);
ext4_block_cache_write_back(mp->fs.bdev, 1);
ext4_trans_start(mp);
r = ext4_generic_open2(mp, &f, path, O_RDWR | O_CREAT, filetype, nil);
if (r == 0)
r = ext4_fsymlink_set(&f, target, strlen(target));
else
goto Finish;
ext4_fclose(&f);
Finish:
if (r != 0)
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_readlink(struct ext4_mountpoint *mp, const char *path, char *buf, usize bufsize, usize *rcnt)
{
int r;
ext4_file f;
int filetype;
assert(buf != nil);
filetype = EXT4_DE_SYMLINK;
EXT4_MP_LOCK(mp);
ext4_block_cache_write_back(mp->fs.bdev, 1);
r = ext4_generic_open2(mp, &f, path, O_RDONLY, filetype, nil);
if (r == 0)
r = ext4_fread(&f, buf, bufsize, rcnt);
else
goto Finish;
ext4_fclose(&f);
Finish:
ext4_block_cache_write_back(mp->fs.bdev, 0);
EXT4_MP_UNLOCK(mp);
return r;
}
static int ext4_mknod_set(ext4_file *f, u32int dev)
{
struct ext4_inode_ref ref;
int r;
assert(f && f->mp);
r = ext4_fs_get_inode_ref(&f->mp->fs, f->inode, &ref);
if (r != 0)
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(struct ext4_mountpoint *mp, const char *path, int filetype, u32int dev)
{
int r;
ext4_file f;
if (mp->fs.read_only) {
werrstr(Erdonlyfs);
return -1;
}
/*
* 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) {
werrstr(Einval);
return -1;
}
/*
* Nor should it be any bogus value.
*/
if (filetype != EXT4_DE_CHRDEV &&
filetype != EXT4_DE_BLKDEV &&
filetype != EXT4_DE_FIFO &&
filetype != EXT4_DE_SOCK) {
werrstr(Einval);
return -1;
}
EXT4_MP_LOCK(mp);
ext4_block_cache_write_back(mp->fs.bdev, 1);
ext4_trans_start(mp);
r = ext4_generic_open2(mp, &f, path, O_RDWR | O_CREAT, filetype, nil);
if (r == 0) {
if (filetype == EXT4_DE_CHRDEV ||
filetype == EXT4_DE_BLKDEV)
r = ext4_mknod_set(&f, dev);
} else {
goto Finish;
}
ext4_fclose(&f);
Finish:
if (r != 0)
ext4_trans_abort(mp);
else
ext4_trans_stop(mp);
ext4_block_cache_write_back(mp->fs.bdev, 0);
EXT4_MP_UNLOCK(mp);
return r;
}
/*********************************DIRECTORY OPERATION************************/
int ext4_dir_rm(struct ext4_mountpoint *mp, const char *path)
{
int r;
ext4_file f;
struct ext4_inode_ref act;
struct ext4_inode_ref child;
struct ext4_dir_iter it;
u32int inode_up;
u32int inode_current;
u32int depth = 1;
bool has_children;
bool dir_end;
if (mp->fs.read_only) {
werrstr(Erdonlyfs);
return -1;
}
EXT4_MP_LOCK(mp);
struct ext4_fs *const fs = &mp->fs;
/*Check if exist.*/
r = ext4_generic_open(mp, &f, path, "r", false, &inode_up);
if (r != 0) {
EXT4_MP_UNLOCK(mp);
return r;
}
inode_current = f.inode;
ext4_block_cache_write_back(mp->fs.bdev, 1);
do {
u64int act_curr_pos = 0;
has_children = false;
dir_end = false;
while (r == 0 && !has_children && !dir_end) {
/*Load directory node.*/
r = ext4_fs_get_inode_ref(fs, inode_current, &act);
if (r != 0) {
break;
}
/*Initialize iterator.*/
r = ext4_dir_iterator_init(&it, &act, act_curr_pos);
if (r != 0) {
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.*/
u32int cinode;
u32int inode_type;
cinode = ext4_dir_en_get_inode(it.curr);
r = ext4_fs_get_inode_ref(fs, cinode, &child);
if (r != 0)
goto End;
/*If directory with no leaf children*/
r = ext4_has_children(&has_children, &child);
if (r != 0) {
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 != 0) {
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);
if (r != 0) {
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 != 0) {
ext4_fs_put_inode_ref(&child);
goto End;
}
r = ext4_fs_put_inode_ref(&child);
if (r != 0)
goto End;
}
r = ext4_dir_iterator_next(&it);
if (r != 0)
goto End;
act_curr_pos = it.curr_off;
End:
ext4_dir_iterator_fini(&it);
if (r == 0)
r = ext4_fs_put_inode_ref(&act);
else
ext4_fs_put_inode_ref(&act);
if (r != 0)
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 != 0)
break;
} while (depth);
/*Last unlink*/
if (r == 0 && !depth) {
/*Load parent.*/
struct ext4_inode_ref parent;
r = ext4_fs_get_inode_ref(&f.mp->fs, inode_up,
&parent);
if (r != 0)
goto Finish;
r = ext4_fs_get_inode_ref(&f.mp->fs, inode_current,
&act);
if (r != 0) {
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);
if (r != 0) {
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 != 0) {
ext4_fs_put_inode_ref(&parent);
ext4_fs_put_inode_ref(&act);
goto Finish;
}
r = ext4_fs_free_inode(&act);
if (r != 0) {
ext4_fs_put_inode_ref(&parent);
ext4_fs_put_inode_ref(&act);
goto Finish;
}
}
r = ext4_fs_put_inode_ref(&parent);
if (r != 0)
goto Finish;
r = ext4_fs_put_inode_ref(&act);
Finish:
if (r != 0)
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(struct ext4_mountpoint *mp, const char *path, const char *new_path)
{
return ext4_frename(mp, path, new_path);
}
int ext4_dir_mk(struct ext4_mountpoint *mp, const char *path)
{
int r;
ext4_file f;
if (mp->fs.read_only) {
werrstr(Erdonlyfs);
return -1;
}
EXT4_MP_LOCK(mp);
/*Check if exist.*/
r = ext4_generic_open(mp, &f, path, "r", false, nil);
if (r == 0) {
ext4_fclose(&f);
werrstr(Eexists);
r = -1;
goto Finish;
}
/*Create new directory.*/
r = ext4_generic_open(mp, &f, path, "w", false, nil);
if(r == 0)
ext4_fclose(&f);
Finish:
EXT4_MP_UNLOCK(mp);
return r;
}
int ext4_dir_open(struct ext4_mountpoint *mp, ext4_dir *dir, const char *path)
{
int r;
EXT4_MP_LOCK(mp);
r = ext4_generic_open(mp, &dir->f, path, "r", false, nil);
dir->next_off = 0;
EXT4_MP_UNLOCK(mp);
return r;
}
int ext4_dir_close(ext4_dir *dir)
{
return ext4_fclose(&dir->f);
}
const ext4_direntry *ext4_dir_entry_next(ext4_dir *dir)
{
#define EXT4_DIR_ENTRY_OFFSET_TERM (u64int)(-1)
int r;
u16int name_length;
ext4_direntry *de = 0;
struct ext4_inode_ref dir_inode;
struct ext4_dir_iter it;
EXT4_MP_LOCK(dir->f.mp);
if (dir->next_off == EXT4_DIR_ENTRY_OFFSET_TERM) {
EXT4_MP_UNLOCK(dir->f.mp);
return 0;
}
r = ext4_fs_get_inode_ref(&dir->f.mp->fs, dir->f.inode, &dir_inode);
if (r != 0) {
goto Finish;
}
r = ext4_dir_iterator_init(&it, &dir_inode, dir->next_off);
if (r != 0) {
ext4_fs_put_inode_ref(&dir_inode);
goto Finish;
}
memset(dir->de.name, 0, sizeof(dir->de.name));
name_length = ext4_dir_en_get_name_len(&dir->f.mp->fs.sb,
it.curr);
memcpy(dir->de.name, it.curr->name, name_length);
/* Directly copying the content isn't safe for Big-endian targets*/
dir->de.inode = ext4_dir_en_get_inode(it.curr);
dir->de.entry_length = ext4_dir_en_get_entry_len(it.curr);
dir->de.name_length = name_length;
dir->de.inode_type = ext4_dir_en_get_inode_type(&dir->f.mp->fs.sb,
it.curr);
de = &dir->de;
ext4_dir_iterator_next(&it);
dir->next_off = it.curr ? it.curr_off : EXT4_DIR_ENTRY_OFFSET_TERM;
ext4_dir_iterator_fini(&it);
ext4_fs_put_inode_ref(&dir_inode);
Finish:
EXT4_MP_UNLOCK(dir->f.mp);
return de;
}
void ext4_dir_entry_rewind(ext4_dir *dir)
{
dir->next_off = 0;
}