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compat_ioctl: scsi: move ioctl handling into drivers

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Each driver calling scsi_ioctl() gets an equivalent compat_ioctl()
handler that implements the same commands by calling scsi_compat_ioctl().

The scsi_cmd_ioctl() and scsi_cmd_blk_ioctl() functions are compatible
at this point, so any driver that calls those can do so for both native
and compat mode, with the argument passed through compat_ptr().

With this, we can remove the entries from fs/compat_ioctl.c.  The new
code is larger, but should be easier to maintain and keep updated with
newly added commands.

Reviewed-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Arnd Bergmann
2019-03-15 17:39:44 +01:00
parent c103d6ee69
commit d320a9551e
7 changed files with 142 additions and 204 deletions
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50
drivers/scsi/sd.c
View File

@@ -1465,13 +1465,12 @@ static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
* Note: most ioctls are forward onto the block subsystem or further
* down in the scsi subsystem.
**/
static int sd_ioctl(struct block_device *bdev, fmode_t mode,
unsigned int cmd, unsigned long arg)
static int sd_ioctl_common(struct block_device *bdev, fmode_t mode,
unsigned int cmd, void __user *p)
{
struct gendisk *disk = bdev->bd_disk;
struct scsi_disk *sdkp = scsi_disk(disk);
struct scsi_device *sdp = sdkp->device;
void __user *p = (void __user *)arg;
int error;
SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
@@ -1507,9 +1506,6 @@ static int sd_ioctl(struct block_device *bdev, fmode_t mode,
break;
default:
error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
if (error != -ENOTTY)
break;
error = scsi_ioctl(sdp, cmd, p);
break;
}
out:
@@ -1691,39 +1687,31 @@ static void sd_rescan(struct device *dev)
revalidate_disk(sdkp->disk);
}
static int sd_ioctl(struct block_device *bdev, fmode_t mode,
unsigned int cmd, unsigned long arg)
{
void __user *p = (void __user *)arg;
int ret;
ret = sd_ioctl_common(bdev, mode, cmd, p);
if (ret != -ENOTTY)
return ret;
return scsi_ioctl(scsi_disk(bdev->bd_disk)->device, cmd, p);
}
#ifdef CONFIG_COMPAT
/*
* This gets directly called from VFS. When the ioctl
* is not recognized we go back to the other translation paths.
*/
static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
unsigned int cmd, unsigned long arg)
{
struct gendisk *disk = bdev->bd_disk;
struct scsi_disk *sdkp = scsi_disk(disk);
struct scsi_device *sdev = sdkp->device;
void __user *p = compat_ptr(arg);
int error;
int ret;
error = scsi_verify_blk_ioctl(bdev, cmd);
if (error < 0)
return error;
ret = sd_ioctl_common(bdev, mode, cmd, p);
if (ret != -ENOTTY)
return ret;
error = scsi_ioctl_block_when_processing_errors(sdev, cmd,
(mode & FMODE_NDELAY) != 0);
if (error)
return error;
if (is_sed_ioctl(cmd))
return sed_ioctl(sdkp->opal_dev, cmd, p);
/*
* Let the static ioctl translation table take care of it.
*/
if (!sdev->host->hostt->compat_ioctl)
return -ENOIOCTLCMD;
return sdev->host->hostt->compat_ioctl(sdev, cmd, p);
return scsi_compat_ioctl(scsi_disk(bdev->bd_disk)->device, cmd, p);
}
#endif