int ubi_check_volume(struct ubi_device *ubi, int vol_id)
{
void *buf;
int err = 0, i;
struct ubi_volume *vol = ubi->volumes[vol_id];
if (vol->vol_type != UBI_STATIC_VOLUME)
return 0;
buf = vmalloc(vol->usable_leb_size);
if (!buf)
return -ENOMEM;
for (i = 0; i < vol->used_ebs; i++) {
int size;
if (i == vol->used_ebs - 1)
size = vol->last_eb_bytes;
else
size = vol->usable_leb_size;
err = ubi_eba_read_leb(ubi, vol, i, buf, 0, size, 1);
if (err) {
if (err == -EBADMSG)
err = 1;
break;
}
}
vfree(buf);
return err;
}
static ssize_t ubi_volume_cdev_read(struct cdev *cdev, void *buf, size_t size,
loff_t offset, unsigned long flags)
{
struct ubi_volume_cdev_priv *priv = cdev->priv;
struct ubi_volume *vol = priv->vol;
struct ubi_device *ubi = priv->ubi;
int err, lnum, off, len;
size_t count_save = size;
unsigned long long tmp;
loff_t offp = offset;
int usable_leb_size = vol->usable_leb_size;
ubi_debug("%s: %zd @ 0x%08llx", __func__, size, offset);
len = size > usable_leb_size ? usable_leb_size : size;
tmp = offp;
off = do_div(tmp, usable_leb_size);
lnum = tmp;
do {
if (off + len >= usable_leb_size)
len = usable_leb_size - off;
err = ubi_eba_read_leb(ubi, vol, lnum, buf, off, len, 0);
if (err) {
ubi_err(ubi, "read error: %s", strerror(-err));
break;
}
off += len;
if (off == usable_leb_size) {
lnum += 1;
off -= usable_leb_size;
}
size -= len;
offp += len;
buf += len;
len = size > usable_leb_size ? usable_leb_size : size;
} while (size);
return count_save;
}
/**
* gluebi_read - read operation of emulated MTD devices.
* @mtd: MTD device description object
* @from: absolute offset from where to read
* @len: how many bytes to read
* @retlen: count of read bytes is returned here
* @buf: buffer to store the read data
*
* This function returns zero in case of success and a negative error code in
* case of failure.
*/
static int gluebi_read(struct mtd_info *mtd, loff_t from, size_t len,
size_t *retlen, unsigned char *buf)
{
int err = 0, lnum, offs, total_read;
struct ubi_volume *vol;
struct ubi_device *ubi;
uint64_t tmp = from;
dbg_msg("read %zd bytes from offset %lld", len, from);
if (len < 0 || from < 0 || from + len > mtd->size)
return -EINVAL;
vol = container_of(mtd, struct ubi_volume, gluebi_mtd);
ubi = vol->ubi;
offs = do_div(tmp, mtd->erasesize);
lnum = tmp;
total_read = len;
while (total_read) {
size_t to_read = mtd->erasesize - offs;
if (to_read > total_read)
to_read = total_read;
err = ubi_eba_read_leb(ubi, vol->vol_id, lnum, buf, offs,
to_read, 0);
if (err)
break;
lnum += 1;
offs = 0;
total_read -= to_read;
buf += to_read;
}
*retlen = len - total_read;
return err;
}
/**
* ubi_leb_read - read data.
* @desc: volume descriptor
* @lnum: logical eraseblock number to read from
* @buf: buffer where to store the read data
* @offset: offset within the logical eraseblock to read from
* @len: how many bytes to read
* @check: whether UBI has to check the read data's CRC or not.
*
* This function reads data from offset @offset of logical eraseblock @lnum and
* stores the data at @buf. When reading from static volumes, @check specifies
* whether the data has to be checked or not. If yes, the whole logical
* eraseblock will be read and its CRC checksum will be checked (i.e., the CRC
* checksum is per-eraseblock). So checking may substantially slow down the
* read speed. The @check argument is ignored for dynamic volumes.
*
* In case of success, this function returns zero. In case of failure, this
* function returns a negative error code.
*
* %-EBADMSG error code is returned:
* o for both static and dynamic volumes if MTD driver has detected a data
* integrity problem (unrecoverable ECC checksum mismatch in case of NAND);
* o for static volumes in case of data CRC mismatch.
*
* If the volume is damaged because of an interrupted update this function just
* returns immediately with %-EBADF error code.
*/
int ubi_leb_read(struct ubi_volume_desc *desc, int lnum, char *buf, int offset,
int len, int check)
{
struct ubi_volume *vol = desc->vol;
struct ubi_device *ubi = vol->ubi;
int err, vol_id = vol->vol_id;
dbg_gen("read %d bytes from LEB %d:%d:%d", len, vol_id, lnum, offset);
if (vol_id < 0 || vol_id >= ubi->vtbl_slots || lnum < 0 ||
lnum >= vol->used_ebs || offset < 0 || len < 0 ||
offset + len > vol->usable_leb_size)
return -EINVAL;
if (vol->vol_type == UBI_STATIC_VOLUME) {
if (vol->used_ebs == 0)
/* Empty static UBI volume */
return 0;
if (lnum == vol->used_ebs - 1 &&
offset + len > vol->last_eb_bytes)
return -EINVAL;
}
if (vol->upd_marker)
return -EBADF;
if (len == 0)
return 0;
err = ubi_eba_read_leb(ubi, vol, lnum, buf, offset, len, check);
if (err && err == -EBADMSG && vol->vol_type == UBI_STATIC_VOLUME) {
ubi_warn("mark volume %d as corrupted", vol_id);
vol->corrupted = 1;
}
return err;
}
/**
* ubi_leb_read - read data.
* @desc: volume descriptor
* @lnum: logical eraseblock number to read from
* @buf: buffer where to store the read data
* @offset: offset within the logical eraseblock to read from
* @len: how many bytes to read
* @check: whether UBI has to check the read data's CRC or not.
*
* This function reads data from offset @offset of logical eraseblock @lnum and
* stores the data at @buf. When reading from static volumes, @check specifies
* whether the data has to be checked or not. If yes, the whole logical
* eraseblock will be read and its CRC checksum will be checked (i.e., the CRC
* checksum is per-eraseblock). So checking may substantially slow down the
* read speed. The @check argument is ignored for dynamic volumes.
*
* In case of success, this function returns zero. In case of failure, this
* function returns a negative error code.
*
* %-EBADMSG error code is returned:
* o for both static and dynamic volumes if MTD driver has detected a data
* integrity problem (unrecoverable ECC checksum mismatch in case of NAND);
* o for static volumes in case of data CRC mismatch.
*
* If the volume is damaged because of an interrupted update this function just
* returns immediately with %-EBADF error code.
*/
int ubi_leb_read(struct ubi_volume_desc *desc, int lnum, char *buf, int offset,
int len, int check)
{
struct ubi_volume *vol = desc->vol;
struct ubi_device *ubi = vol->ubi;
int err, vol_id = vol->vol_id;
dbg_gen("read %d bytes from LEB %d:%d:%d", len, vol_id, lnum, offset);
err = leb_read_sanity_check(desc, lnum, offset, len);
if (err < 0)
return err;
if (len == 0)
return 0;
err = ubi_eba_read_leb(ubi, vol, lnum, buf, offset, len, check);
if (err && mtd_is_eccerr(err) && vol->vol_type == UBI_STATIC_VOLUME) {
ubi_warn(ubi, "mark volume %d as corrupted", vol_id);
vol->corrupted = 1;
}
return err;
}
static ssize_t vol_cdev_read(struct file *file, __user char *buf, size_t count,
loff_t *offp)
{
struct ubi_volume_desc *desc = file->private_data;
struct ubi_volume *vol = desc->vol;
struct ubi_device *ubi = vol->ubi;
int err, lnum, off, len, tbuf_size;
size_t count_save = count;
void *tbuf;
uint64_t tmp;
dbg_msg("read %zd bytes from offset %lld of volume %d",
count, *offp, vol->vol_id);
if (vol->updating) {
dbg_err("updating");
return -EBUSY;
}
if (vol->upd_marker) {
dbg_err("damaged volume, update marker is set");
return -EBADF;
}
if (*offp == vol->used_bytes || count == 0)
return 0;
if (vol->corrupted)
dbg_msg("read from corrupted volume %d", vol->vol_id);
if (*offp + count > vol->used_bytes)
count_save = count = vol->used_bytes - *offp;
tbuf_size = vol->usable_leb_size;
if (count < tbuf_size)
tbuf_size = ALIGN(count, ubi->min_io_size);
tbuf = vmalloc(tbuf_size);
if (!tbuf)
return -ENOMEM;
len = count > tbuf_size ? tbuf_size : count;
tmp = *offp;
off = do_div(tmp, vol->usable_leb_size);
lnum = tmp;
do {
cond_resched();
if (off + len >= vol->usable_leb_size)
len = vol->usable_leb_size - off;
err = ubi_eba_read_leb(ubi, vol, lnum, tbuf, off, len, 0);
if (err)
break;
off += len;
if (off == vol->usable_leb_size) {
lnum += 1;
off -= vol->usable_leb_size;
}
count -= len;
*offp += len;
err = copy_to_user(buf, tbuf, len);
if (err) {
err = -EFAULT;
break;
}
buf += len;
len = count > tbuf_size ? tbuf_size : count;
} while (count);
vfree(tbuf);
return err ? err : count_save - count;
}
static int ubi_volume_read(char *volume, char *buf, size_t size)
{
int err, lnum, off, len, tbuf_size, i = 0;
size_t count_save = size;
void *tbuf;
unsigned long long tmp;
struct ubi_volume *vol = NULL;
loff_t offp = 0;
for (i = 0; i < ubi->vtbl_slots; i++) {
vol = ubi->volumes[i];
if (vol && !strcmp(vol->name, volume)) {
printf("Volume %s found at volume id %d\n",
volume, vol->vol_id);
break;
}
}
if (i == ubi->vtbl_slots) {
printf("%s volume not found\n", volume);
return 0;
}
printf("read %i bytes from volume %d to %x(buf address)\n",
(int) size, vol->vol_id, (unsigned)buf);
if (vol->updating) {
printf("updating");
return -EBUSY;
}
if (vol->upd_marker) {
printf("damaged volume, update marker is set");
return -EBADF;
}
if (offp == vol->used_bytes)
return 0;
if (size == 0) {
printf("Read [%lu] bytes\n", (unsigned long) vol->used_bytes);
size = vol->used_bytes;
}
if (vol->corrupted)
printf("read from corrupted volume %d", vol->vol_id);
if (offp + size > vol->used_bytes)
count_save = size = vol->used_bytes - offp;
tbuf_size = vol->usable_leb_size;
if (size < tbuf_size)
tbuf_size = ALIGN(size, ubi->min_io_size);
tbuf = malloc(tbuf_size);
if (!tbuf) {
printf("NO MEM\n");
return -ENOMEM;
}
len = size > tbuf_size ? tbuf_size : size;
tmp = offp;
off = do_div(tmp, vol->usable_leb_size);
lnum = tmp;
do {
if (off + len >= vol->usable_leb_size)
len = vol->usable_leb_size - off;
err = ubi_eba_read_leb(ubi, vol, lnum, tbuf, off, len, 0);
if (err) {
printf("read err %x\n", err);
break;
}
off += len;
if (off == vol->usable_leb_size) {
lnum += 1;
off -= vol->usable_leb_size;
}
size -= len;
offp += len;
memcpy(buf, tbuf, len);
buf += len;
len = size > tbuf_size ? tbuf_size : size;
} while (size);
free(tbuf);
return err ? err : count_save - size;
}
static int ubi_volume_read(char *volume, char *buf, size_t size, size_t offset)
{
int err, lnum, off, len, tbuf_size;
void *tbuf;
unsigned long long tmp;
struct ubi_volume *vol;
loff_t offp = 0;
vol = ubi_find_volume(volume);
if (vol == NULL)
return ENODEV;
offp = offset;
printf("Read 0x%x bytes from volume [%s] offset 0x%x to %p\n", size, volume, offset, buf);
if (vol->updating) {
printf("updating");
return EBUSY;
}
if (vol->upd_marker) {
printf("damaged volume, update marker is set");
return EBADF;
}
if (offp == vol->used_bytes)
return 0;
if (size == 0) {
printf("No size specified -> Using max size (0x%lx)\n", (long)vol->used_bytes);
size = vol->used_bytes;
}
if (vol->corrupted)
printf("read from corrupted volume %d", vol->vol_id);
if (offp + size > vol->used_bytes)
size = vol->used_bytes - offp;
tbuf_size = vol->usable_leb_size;
if (size < tbuf_size)
tbuf_size = ALIGN(size, ubi->min_io_size);
tbuf = malloc(tbuf_size);
if (!tbuf) {
printf("NO MEM\n");
return ENOMEM;
}
len = size > tbuf_size ? tbuf_size : size;
tmp = offp;
off = do_div(tmp, vol->usable_leb_size);
lnum = tmp;
do {
if (off + len >= vol->usable_leb_size)
len = vol->usable_leb_size - off;
err = ubi_eba_read_leb(ubi, vol, lnum, tbuf, off, len, 0);
if (err) {
printf("read err %x\n", err);
err = -err;
break;
}
off += len;
if (off == vol->usable_leb_size) {
lnum += 1;
off -= vol->usable_leb_size;
}
size -= len;
offp += len;
memcpy(buf, tbuf, len);
buf += len;
len = size > tbuf_size ? tbuf_size : size;
} while (size);
free(tbuf);
debug("\n0x%x bytes read from volume %s\n", size, volume);
return err;
}