/**
* ubi_detach - detach an UBI device
* @ubi_num: The UBI device number
*
* UBI volumes used by UBIFS will be unmounted before detaching the
* UBI device.
*
* @return: 0 for success, negative error code otherwise
*/
int ubi_detach(int ubi_num)
{
struct ubi_device *ubi;
if (ubi_num < 0 || ubi_num >= UBI_MAX_DEVICES)
return -EINVAL;
ubi = ubi_devices[ubi_num];
if (!ubi)
return -ENOENT;
ubi_umount_volumes(ubi);
return ubi_detach_mtd_dev(ubi_num, 1);
}
BAREBOX_CMD_END
static int do_ubidetach(int argc, char *argv[])
{
int ubi_num, ret;
if (argc != 2)
return COMMAND_ERROR_USAGE;
ubi_num = simple_strtoul(argv[1], NULL, 0);
ret = ubi_detach_mtd_dev(ubi_num, 1);
if (ret)
printf("failed to detach: %s\n", strerror(-ret));
return ret;
}
static int ctrl_cdev_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
int err = 0;
void __user *argp = (void __user *)arg;
if (!capable(CAP_SYS_RESOURCE))
return -EPERM;
switch (cmd) {
/* Attach an MTD device command */
case UBI_IOCATT:
{
struct ubi_attach_req req;
struct mtd_info *mtd;
dbg_msg("attach MTD device");
err = copy_from_user(&req, argp, sizeof(struct ubi_attach_req));
if (err) {
err = -EFAULT;
break;
}
if (req.mtd_num < 0 ||
(req.ubi_num < 0 && req.ubi_num != UBI_DEV_NUM_AUTO)) {
err = -EINVAL;
break;
}
mtd = get_mtd_device(NULL, req.mtd_num);
if (IS_ERR(mtd)) {
err = PTR_ERR(mtd);
break;
}
/*
* Note, further request verification is done by
* 'ubi_attach_mtd_dev()'.
*/
mutex_lock(&ubi_devices_mutex);
err = ubi_attach_mtd_dev(mtd, req.ubi_num, req.vid_hdr_offset);
mutex_unlock(&ubi_devices_mutex);
if (err < 0)
put_mtd_device(mtd);
else
/* @err contains UBI device number */
err = put_user(err, (__user int32_t *)argp);
break;
}
/* Detach an MTD device command */
case UBI_IOCDET:
{
int ubi_num;
dbg_msg("dettach MTD device");
err = get_user(ubi_num, (__user int32_t *)argp);
if (err) {
err = -EFAULT;
break;
}
mutex_lock(&ubi_devices_mutex);
err = ubi_detach_mtd_dev(ubi_num, 0);
mutex_unlock(&ubi_devices_mutex);
break;
}
default:
err = -ENOTTY;
break;
}
return err;
}
