static ssize_t vol_cdev_write(struct file *file, const char __user *buf,
size_t count, loff_t *offp)
{
int err = 0;
struct ubi_volume_desc *desc = file->private_data;
struct ubi_volume *vol = desc->vol;
struct ubi_device *ubi = vol->ubi;
if (!vol->updating && !vol->changing_leb)
return vol_cdev_direct_write(file, buf, count, offp);
if (vol->updating)
err = ubi_more_update_data(ubi, vol, buf, count);
else
err = ubi_more_leb_change_data(ubi, vol, buf, count);
if (err < 0) {
ubi_err("cannot accept more %zd bytes of data, error %d",
count, err);
return err;
}
if (err) {
/*
* The operation is finished, @err contains number of actually
* written bytes.
*/
count = err;
if (vol->changing_leb) {
revoke_exclusive(desc, UBI_READWRITE);
return count;
}
err = ubi_check_volume(ubi, vol->vol_id);
if (err < 0)
return err;
if (err) {
ubi_warn("volume %d on UBI device %d is corrupted",
vol->vol_id, ubi->ubi_num);
vol->corrupted = 1;
}
vol->checked = 1;
ubi_gluebi_updated(vol);
revoke_exclusive(desc, UBI_READWRITE);
}
return count;
}
static ssize_t vol_cdev_write(struct file *file, const char __user *buf,
size_t count, loff_t *offp)
{
int err = 0;
struct ubi_volume_desc *desc = file->private_data;
struct ubi_volume *vol = desc->vol;
struct ubi_device *ubi = vol->ubi;
if (!vol->updating)
return vol_cdev_direct_write(file, buf, count, offp);
err = ubi_more_update_data(ubi, vol->vol_id, buf, count);
if (err < 0) {
ubi_err("cannot write %zd bytes of update data", count);
return err;
}
if (err) {
/*
* Update is finished, @err contains number of actually written
* bytes now.
*/
count = err;
err = ubi_check_volume(ubi, vol->vol_id);
if (err < 0)
return err;
if (err) {
ubi_warn("volume %d on UBI device %d is corrupted",
vol->vol_id, ubi->ubi_num);
vol->corrupted = 1;
}
vol->checked = 1;
ubi_gluebi_updated(vol);
revoke_exclusive(desc, UBI_READWRITE);
}
*offp += count;
return count;
}
static int vol_cdev_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
int err = 0;
struct ubi_volume_desc *desc = file->private_data;
struct ubi_volume *vol = desc->vol;
struct ubi_device *ubi = vol->ubi;
void __user *argp = (void __user *)arg;
switch (cmd) {
/* Volume update command */
case UBI_IOCVOLUP:
{
int64_t bytes, rsvd_bytes;
if (!capable(CAP_SYS_RESOURCE)) {
err = -EPERM;
break;
}
err = copy_from_user(&bytes, argp, sizeof(int64_t));
if (err) {
err = -EFAULT;
break;
}
if (desc->mode == UBI_READONLY) {
err = -EROFS;
break;
}
rsvd_bytes = vol->reserved_pebs * (ubi->leb_size-vol->data_pad);
if (bytes < 0 || bytes > rsvd_bytes) {
err = -EINVAL;
break;
}
err = get_exclusive(desc);
if (err < 0)
break;
err = ubi_start_update(ubi, vol, bytes);
if (bytes == 0)
revoke_exclusive(desc, UBI_READWRITE);
break;
}
/* Atomic logical eraseblock change command */
case UBI_IOCEBCH:
{
struct ubi_leb_change_req req;
err = copy_from_user(&req, argp,
sizeof(struct ubi_leb_change_req));
if (err) {
err = -EFAULT;
break;
}
if (desc->mode == UBI_READONLY ||
vol->vol_type == UBI_STATIC_VOLUME) {
err = -EROFS;
break;
}
/* Validate the request */
err = -EINVAL;
if (req.lnum < 0 || req.lnum >= vol->reserved_pebs ||
req.bytes < 0 || req.lnum >= vol->usable_leb_size)
break;
if (req.dtype != UBI_LONGTERM && req.dtype != UBI_SHORTTERM &&
req.dtype != UBI_UNKNOWN)
break;
err = get_exclusive(desc);
if (err < 0)
break;
err = ubi_start_leb_change(ubi, vol, &req);
if (req.bytes == 0)
revoke_exclusive(desc, UBI_READWRITE);
break;
}
#ifdef CONFIG_MTD_UBI_DEBUG_USERSPACE_IO
/* Logical eraseblock erasure command */
case UBI_IOCEBER:
{
int32_t lnum;
err = get_user(lnum, (__user int32_t *)argp);
if (err) {
err = -EFAULT;
break;
}
if (desc->mode == UBI_READONLY ||
vol->vol_type == UBI_STATIC_VOLUME) {
err = -EROFS;
break;
}
if (lnum < 0 || lnum >= vol->reserved_pebs) {
err = -EINVAL;
break;
}
dbg_msg("erase LEB %d:%d", vol->vol_id, lnum);
err = ubi_eba_unmap_leb(ubi, vol, lnum);
if (err)
break;
err = ubi_wl_flush(ubi);
break;
}
#endif
default:
err = -ENOTTY;
break;
}
return err;
}
static int vol_cdev_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
int err = 0;
struct ubi_volume_desc *desc = file->private_data;
struct ubi_volume *vol = desc->vol;
struct ubi_device *ubi = vol->ubi;
void __user *argp = (void __user *)arg;
if (_IOC_NR(cmd) > VOL_CDEV_IOC_MAX_SEQ ||
_IOC_TYPE(cmd) != UBI_VOL_IOC_MAGIC)
return -ENOTTY;
if (_IOC_DIR(cmd) && _IOC_READ)
err = !access_ok(VERIFY_WRITE, argp, _IOC_SIZE(cmd));
else if (_IOC_DIR(cmd) && _IOC_WRITE)
err = !access_ok(VERIFY_READ, argp, _IOC_SIZE(cmd));
if (err)
return -EFAULT;
switch (cmd) {
/* Volume update command */
case UBI_IOCVOLUP:
{
int64_t bytes, rsvd_bytes;
if (!capable(CAP_SYS_RESOURCE)) {
err = -EPERM;
break;
}
err = copy_from_user(&bytes, argp, sizeof(int64_t));
if (err) {
err = -EFAULT;
break;
}
if (desc->mode == UBI_READONLY) {
err = -EROFS;
break;
}
rsvd_bytes = vol->reserved_pebs * (ubi->leb_size-vol->data_pad);
if (bytes < 0 || bytes > rsvd_bytes) {
err = -EINVAL;
break;
}
err = get_exclusive(desc);
if (err < 0)
break;
err = ubi_start_update(ubi, vol->vol_id, bytes);
if (bytes == 0)
revoke_exclusive(desc, UBI_READWRITE);
file->f_pos = 0;
break;
}
#ifdef CONFIG_MTD_UBI_DEBUG_USERSPACE_IO
/* Logical eraseblock erasure command */
case UBI_IOCEBER:
{
int32_t lnum;
err = __get_user(lnum, (__user int32_t *)argp);
if (err) {
err = -EFAULT;
break;
}
if (desc->mode == UBI_READONLY) {
err = -EROFS;
break;
}
if (lnum < 0 || lnum >= vol->reserved_pebs) {
err = -EINVAL;
break;
}
if (vol->vol_type != UBI_DYNAMIC_VOLUME) {
err = -EROFS;
break;
}
dbg_msg("erase LEB %d:%d", vol->vol_id, lnum);
err = ubi_eba_unmap_leb(ubi, vol->vol_id, lnum);
if (err)
break;
err = ubi_wl_flush(ubi);
break;
}
#endif
default:
err = -ENOTTY;
break;
}
return err;
}
