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scsi: st: Simplify ioctl handling 

Merge st_ioctl_common() into st_ioctl() and streamline the invocation of
the common ioctl helpers.

Link: https://lore.kernel.org/r/20210724072033.1284840-8-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Christoph Hellwig 2021-07-24 09:20:16 +02:00 committed by Martin K. Petersen
parent 6fade4505a
commit dba7688fc9
1 changed files with 30 additions and 50 deletions
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80
drivers/scsi/st.c
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@ -3499,8 +3499,9 @@ out:
/* The ioctl command */
static long st_ioctl_common(struct file *file, unsigned int cmd_in, void __user *p)
static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
{
void __user *p = (void __user *)arg;
int i, cmd_nr, cmd_type, bt;
int retval = 0;
unsigned int blk;
@ -3820,73 +3821,52 @@ static long st_ioctl_common(struct file *file, unsigned int cmd_in, void __user
goto out;
}
mutex_unlock(&STp->lock);
switch (cmd_in) {
case SCSI_IOCTL_STOP_UNIT:
/* unload */
retval = scsi_ioctl(STp->device, cmd_in, p);
if (!retval) {
STp->rew_at_close = 0;
STp->ready = ST_NO_TAPE;
}
case SCSI_IOCTL_GET_IDLUN:
case SCSI_IOCTL_GET_BUS_NUMBER:
break;
case SG_IO:
case SCSI_IOCTL_SEND_COMMAND:
case CDROM_SEND_PACKET:
if (!capable(CAP_SYS_RAWIO))
return -EPERM;
fallthrough;
default:
retval = scsi_cmd_ioctl(STp->disk->queue, STp->disk,
file->f_mode, cmd_in, p);
if (retval != -ENOTTY)
return retval;
case SCSI_IOCTL_GET_IDLUN:
case SCSI_IOCTL_GET_BUS_NUMBER:
break;
default:
if ((cmd_in == SG_IO ||
cmd_in == SCSI_IOCTL_SEND_COMMAND ||
cmd_in == CDROM_SEND_PACKET) &&
!capable(CAP_SYS_RAWIO))
i = -EPERM;
else
i = scsi_cmd_ioctl(STp->disk->queue, STp->disk,
file->f_mode, cmd_in, p);
if (i != -ENOTTY)
return i;
break;
break;
}
return -ENOTTY;
retval = scsi_ioctl(STp->device, cmd_in, p);
if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) {
/* unload */
STp->rew_at_close = 0;
STp->ready = ST_NO_TAPE;
}
return retval;
out:
mutex_unlock(&STp->lock);
return retval;
}
static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
{
void __user *p = (void __user *)arg;
struct scsi_tape *STp = file->private_data;
int ret;
ret = st_ioctl_common(file, cmd_in, p);
if (ret != -ENOTTY)
return ret;
return scsi_ioctl(STp->device, cmd_in, p);
}
#ifdef CONFIG_COMPAT
static long st_compat_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
{
void __user *p = compat_ptr(arg);
struct scsi_tape *STp = file->private_data;
int ret;
/* argument conversion is handled using put_user_mtpos/put_user_mtget */
switch (cmd_in) {
case MTIOCPOS32:
return st_ioctl_common(file, MTIOCPOS, p);
cmd_in = MTIOCPOS;
break;
case MTIOCGET32:
return st_ioctl_common(file, MTIOCGET, p);
cmd_in = MTIOCGET;
break;
}
ret = st_ioctl_common(file, cmd_in, p);
if (ret != -ENOTTY)
return ret;
return scsi_ioctl(STp->device, cmd_in, p);
return st_ioctl(file, cmd_in, arg);
}
#endif