/**
* autoresize - re-size the volume which has the "auto-resize" flag set.
* @ubi: UBI device description object
* @vol_id: ID of the volume to re-size
*
* This function re-sizes the volume marked by the %UBI_VTBL_AUTORESIZE_FLG in
* the volume table to the largest possible size. See comments in ubi-header.h
* for more description of the flag. Returns zero in case of success and a
* negative error code in case of failure.
*/
static int autoresize(struct ubi_device *ubi, int vol_id)
{
struct ubi_volume_desc desc;
struct ubi_volume *vol = ubi->volumes[vol_id];
int err, old_reserved_pebs = vol->reserved_pebs;
if (ubi->ro_mode) {
ubi_warn("skip auto-resize because of R/O mode");
return 0;
}
/*
* Clear the auto-resize flag in the volume in-memory copy of the
* volume table, and 'ubi_resize_volume()' will propagate this change
* to the flash.
*/
ubi->vtbl[vol_id].flags &= ~UBI_VTBL_AUTORESIZE_FLG;
if (ubi->avail_pebs == 0) {
struct ubi_vtbl_record vtbl_rec;
/*
* No available PEBs to re-size the volume, clear the flag on
* flash and exit.
*/
vtbl_rec = ubi->vtbl[vol_id];
err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec);
if (err)
ubi_err("cannot clean auto-resize flag for volume %d",
vol_id);
} else {
desc.vol = vol;
err = ubi_resize_volume(&desc,
old_reserved_pebs + ubi->avail_pebs);
if (err)
ubi_err("cannot auto-resize volume %d", vol_id);
}
if (err)
return err;
ubi_msg("volume %d (\"%s\") re-sized from %d to %d LEBs", vol_id,
vol->name, old_reserved_pebs, vol->reserved_pebs);
return 0;
}
static int ubi_cdev_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
int err = 0;
struct ubi_device *ubi;
struct ubi_volume_desc *desc;
void __user *argp = (void __user *)arg;
if (!capable(CAP_SYS_RESOURCE))
return -EPERM;
ubi = ubi_get_by_major(imajor(inode));
if (!ubi)
return -ENODEV;
switch (cmd) {
/* Create volume command */
case UBI_IOCMKVOL:
{
struct ubi_mkvol_req req;
dbg_msg("create volume");
err = copy_from_user(&req, argp, sizeof(struct ubi_mkvol_req));
if (err) {
err = -EFAULT;
break;
}
err = verify_mkvol_req(ubi, &req);
if (err)
break;
req.name[req.name_len] = '\0';
mutex_lock(&ubi->volumes_mutex);
err = ubi_create_volume(ubi, &req);
mutex_unlock(&ubi->volumes_mutex);
if (err)
break;
err = put_user(req.vol_id, (__user int32_t *)argp);
if (err)
err = -EFAULT;
break;
}
/* Remove volume command */
case UBI_IOCRMVOL:
{
int vol_id;
dbg_msg("remove volume");
err = get_user(vol_id, (__user int32_t *)argp);
if (err) {
err = -EFAULT;
break;
}
desc = ubi_open_volume(ubi->ubi_num, vol_id, UBI_EXCLUSIVE);
if (IS_ERR(desc)) {
err = PTR_ERR(desc);
break;
}
mutex_lock(&ubi->volumes_mutex);
err = ubi_remove_volume(desc);
mutex_unlock(&ubi->volumes_mutex);
/*
* The volume is deleted (unless an error occurred), and the
* 'struct ubi_volume' object will be freed when
* 'ubi_close_volume()' will call 'put_device()'.
*/
ubi_close_volume(desc);
break;
}
/* Re-size volume command */
case UBI_IOCRSVOL:
{
int pebs;
uint64_t tmp;
struct ubi_rsvol_req req;
dbg_msg("re-size volume");
err = copy_from_user(&req, argp, sizeof(struct ubi_rsvol_req));
if (err) {
err = -EFAULT;
break;
}
err = verify_rsvol_req(ubi, &req);
if (err)
break;
desc = ubi_open_volume(ubi->ubi_num, req.vol_id, UBI_EXCLUSIVE);
if (IS_ERR(desc)) {
err = PTR_ERR(desc);
break;
}
tmp = req.bytes;
pebs = !!do_div(tmp, desc->vol->usable_leb_size);
pebs += tmp;
mutex_lock(&ubi->volumes_mutex);
err = ubi_resize_volume(desc, pebs);
mutex_unlock(&ubi->volumes_mutex);
ubi_close_volume(desc);
break;
}
default:
err = -ENOTTY;
break;
}
ubi_put_device(ubi);
return err;
}
static int ubi_cdev_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
int err = 0;
struct ubi_device *ubi;
struct ubi_volume_desc *desc;
void __user *argp = (void __user *)arg;
if (_IOC_NR(cmd) > UBI_CDEV_IOC_MAX_SEQ ||
_IOC_TYPE(cmd) != UBI_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;
if (!capable(CAP_SYS_RESOURCE))
return -EPERM;
ubi = major_to_device(imajor(inode));
if (IS_ERR(ubi))
return PTR_ERR(ubi);
switch (cmd) {
/* Create volume command */
case UBI_IOCMKVOL:
{
struct ubi_mkvol_req req;
dbg_msg("create volume");
err = __copy_from_user(&req, argp,
sizeof(struct ubi_mkvol_req));
if (err) {
err = -EFAULT;
break;
}
err = verify_mkvol_req(ubi, &req);
if (err)
break;
req.name[req.name_len] = '\0';
err = ubi_create_volume(ubi, &req);
if (err)
break;
err = __put_user(req.vol_id, (__user int32_t *)argp);
if (err)
err = -EFAULT;
break;
}
/* Remove volume command */
case UBI_IOCRMVOL:
{
int vol_id;
dbg_msg("remove volume");
err = __get_user(vol_id, (__user int32_t *)argp);
if (err) {
err = -EFAULT;
break;
}
desc = ubi_open_volume(ubi->ubi_num, vol_id, UBI_EXCLUSIVE);
if (IS_ERR(desc)) {
err = PTR_ERR(desc);
break;
}
err = ubi_remove_volume(desc);
if (err)
ubi_close_volume(desc);
break;
}
/* Re-size volume command */
case UBI_IOCRSVOL:
{
int pebs;
uint64_t tmp;
struct ubi_rsvol_req req;
dbg_msg("re-size volume");
err = __copy_from_user(&req, argp,
sizeof(struct ubi_rsvol_req));
if (err) {
err = -EFAULT;
break;
}
err = verify_rsvol_req(ubi, &req);
if (err)
break;
desc = ubi_open_volume(ubi->ubi_num, req.vol_id, UBI_EXCLUSIVE);
if (IS_ERR(desc)) {
err = PTR_ERR(desc);
break;
}
tmp = req.bytes;
pebs = !!do_div(tmp, desc->vol->usable_leb_size);
pebs += tmp;
err = ubi_resize_volume(desc, pebs);
ubi_close_volume(desc);
break;
}
default:
err = -ENOTTY;
break;
}
return err;
}