[15/24] compat_ioctl: scsi: move ioctl handling into drivers
diff mbox series

Message ID 20191211204306.1207817-16-arnd@arndb.de
State New
Headers show
Series
  • block, scsi: final compat_ioctl cleanup
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Commit Message

Arnd Bergmann Dec. 11, 2019, 8:42 p.m. UTC
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.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/block/virtio_blk.c |   3 +
 drivers/scsi/ch.c          |   9 ++-
 drivers/scsi/sd.c          |  50 ++++++--------
 drivers/scsi/sg.c          |  44 ++++++++-----
 drivers/scsi/sr.c          |  57 ++++++++++++++--
 drivers/scsi/st.c          |  51 ++++++++------
 fs/compat_ioctl.c          | 132 +------------------------------------
 7 files changed, 142 insertions(+), 204 deletions(-)

Comments

Michael S. Tsirkin Dec. 11, 2019, 11:05 p.m. UTC | #1
On Wed, Dec 11, 2019 at 09:42:49PM +0100, Arnd Bergmann wrote:
> 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.
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
>  drivers/block/virtio_blk.c |   3 +
>  drivers/scsi/ch.c          |   9 ++-
>  drivers/scsi/sd.c          |  50 ++++++--------
>  drivers/scsi/sg.c          |  44 ++++++++-----
>  drivers/scsi/sr.c          |  57 ++++++++++++++--
>  drivers/scsi/st.c          |  51 ++++++++------
>  fs/compat_ioctl.c          | 132 +------------------------------------
>  7 files changed, 142 insertions(+), 204 deletions(-)
> 
> diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
> index 7ffd719d89de..fbbf18ac1d5d 100644
> --- a/drivers/block/virtio_blk.c
> +++ b/drivers/block/virtio_blk.c
> @@ -405,6 +405,9 @@ static int virtblk_getgeo(struct block_device *bd, struct hd_geometry *geo)
>  
>  static const struct block_device_operations virtblk_fops = {
>  	.ioctl  = virtblk_ioctl,
> +#ifdef CONFIG_COMPAT
> +	.compat_ioctl = blkdev_compat_ptr_ioctl,
> +#endif
>  	.owner  = THIS_MODULE,
>  	.getgeo = virtblk_getgeo,
>  };

Hmm - is virtio blk lumped in with scsi things intentionally?
Paolo Bonzini Dec. 12, 2019, 12:28 a.m. UTC | #2
On 12/12/19 00:05, Michael S. Tsirkin wrote:
>> @@ -405,6 +405,9 @@ static int virtblk_getgeo(struct block_device *bd, struct hd_geometry *geo)
>>  
>>  static const struct block_device_operations virtblk_fops = {
>>  	.ioctl  = virtblk_ioctl,
>> +#ifdef CONFIG_COMPAT
>> +	.compat_ioctl = blkdev_compat_ptr_ioctl,
>> +#endif
>>  	.owner  = THIS_MODULE,
>>  	.getgeo = virtblk_getgeo,
>>  };
> Hmm - is virtio blk lumped in with scsi things intentionally?

I think it's because the only ioctl for virtio-blk is SG_IO.  It makes
sense to lump it in with scsi, but I wouldn't mind getting rid of
CONFIG_VIRTIO_BLK_SCSI altogether.

Paolo
Arnd Bergmann Dec. 12, 2019, 9:17 a.m. UTC | #3
On Thu, Dec 12, 2019 at 1:28 AM Paolo Bonzini <pbonzini@redhat.com> wrote:
> On 12/12/19 00:05, Michael S. Tsirkin wrote:
> >> @@ -405,6 +405,9 @@ static int virtblk_getgeo(struct block_device *bd, struct hd_geometry *geo)
> >>
> >>  static const struct block_device_operations virtblk_fops = {
> >>      .ioctl  = virtblk_ioctl,
> >> +#ifdef CONFIG_COMPAT
> >> +    .compat_ioctl = blkdev_compat_ptr_ioctl,
> >> +#endif
> >>      .owner  = THIS_MODULE,
> >>      .getgeo = virtblk_getgeo,
> >>  };
> > Hmm - is virtio blk lumped in with scsi things intentionally?
>
> I think it's because the only ioctl for virtio-blk is SG_IO.  It makes
> sense to lump it in with scsi, but I wouldn't mind getting rid of
> CONFIG_VIRTIO_BLK_SCSI altogether.

It currently calls scsi_cmd_blk_ioctl(), which implements a bunch of ioctl
commands, including some that are unrelated to SG_IO:

                case SG_GET_VERSION_NUM:
                case SCSI_IOCTL_GET_IDLUN:
                case SCSI_IOCTL_GET_BUS_NUMBER:
                case SG_SET_TIMEOUT:
                case SG_GET_TIMEOUT:
                case SG_GET_RESERVED_SIZE:
                case SG_SET_RESERVED_SIZE:
                case SG_EMULATED_HOST:
                case SG_IO: {
                case CDROM_SEND_PACKET:
                case SCSI_IOCTL_SEND_COMMAND:
                case CDROMCLOSETRAY:
                case CDROMEJECT:

My patch changes all callers of this function, and the idea is
to preserve the existing behavior through my series, so I think
it makes sense to keep my patch as is.

I would assume that calling scsi_cmd_blk_ioctl() is harmless
here, but if you want to remove it or limit the set of supported
commands, that should be independent of my change.

       Arnd
Michael S. Tsirkin Dec. 12, 2019, 10:25 a.m. UTC | #4
On Wed, Dec 11, 2019 at 09:42:49PM +0100, Arnd Bergmann wrote:
> 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.
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
>  drivers/block/virtio_blk.c |   3 +
>  drivers/scsi/ch.c          |   9 ++-
>  drivers/scsi/sd.c          |  50 ++++++--------
>  drivers/scsi/sg.c          |  44 ++++++++-----
>  drivers/scsi/sr.c          |  57 ++++++++++++++--
>  drivers/scsi/st.c          |  51 ++++++++------
>  fs/compat_ioctl.c          | 132 +------------------------------------
>  7 files changed, 142 insertions(+), 204 deletions(-)
> 
> diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
> index 7ffd719d89de..fbbf18ac1d5d 100644
> --- a/drivers/block/virtio_blk.c
> +++ b/drivers/block/virtio_blk.c
> @@ -405,6 +405,9 @@ static int virtblk_getgeo(struct block_device *bd, struct hd_geometry *geo)
>  
>  static const struct block_device_operations virtblk_fops = {
>  	.ioctl  = virtblk_ioctl,
> +#ifdef CONFIG_COMPAT
> +	.compat_ioctl = blkdev_compat_ptr_ioctl,
> +#endif
>  	.owner  = THIS_MODULE,
>  	.getgeo = virtblk_getgeo,
>  };


virtio part:

Acked-by: Michael S. Tsirkin <mst@redhat.com>

> diff --git a/drivers/scsi/ch.c b/drivers/scsi/ch.c
> index 76751d6c7f0d..ed5f4a6ae270 100644
> --- a/drivers/scsi/ch.c
> +++ b/drivers/scsi/ch.c
> @@ -872,6 +872,10 @@ static long ch_ioctl_compat(struct file * file,
>  			    unsigned int cmd, unsigned long arg)
>  {
>  	scsi_changer *ch = file->private_data;
> +	int retval = scsi_ioctl_block_when_processing_errors(ch->device, cmd,
> +							file->f_flags & O_NDELAY);
> +	if (retval)
> +		return retval;
>  
>  	switch (cmd) {
>  	case CHIOGPARAMS:
> @@ -883,7 +887,7 @@ static long ch_ioctl_compat(struct file * file,
>  	case CHIOINITELEM:
>  	case CHIOSVOLTAG:
>  		/* compatible */
> -		return ch_ioctl(file, cmd, arg);
> +		return ch_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
>  	case CHIOGSTATUS32:
>  	{
>  		struct changer_element_status32 ces32;
> @@ -898,8 +902,7 @@ static long ch_ioctl_compat(struct file * file,
>  		return ch_gstatus(ch, ces32.ces_type, data);
>  	}
>  	default:
> -		// return scsi_ioctl_compat(ch->device, cmd, (void*)arg);
> -		return -ENOIOCTLCMD;
> +		return scsi_compat_ioctl(ch->device, cmd, compat_ptr(arg));
>  
>  	}
>  }
> diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
> index cea625906440..5afb0046b12a 100644
> --- a/drivers/scsi/sd.c
> +++ b/drivers/scsi/sd.c
> @@ -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;
> -
> -	error = scsi_verify_blk_ioctl(bdev, cmd);
> -	if (error < 0)
> -		return error;
> +	int ret;
>  
> -	error = scsi_ioctl_block_when_processing_errors(sdev, cmd,
> -			(mode & FMODE_NDELAY) != 0);
> -	if (error)
> -		return error;
> +	ret = sd_ioctl_common(bdev, mode, cmd, p);
> +	if (ret != -ENOTTY)
> +		return ret;
>  
> -	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
>  
> diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
> index 985546aac236..08efcee7a34d 100644
> --- a/drivers/scsi/sg.c
> +++ b/drivers/scsi/sg.c
> @@ -910,19 +910,14 @@ static int put_compat_request_table(struct compat_sg_req_info __user *o,
>  #endif
>  
>  static long
> -sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
> +sg_ioctl_common(struct file *filp, Sg_device *sdp, Sg_fd *sfp,
> +		unsigned int cmd_in, void __user *p)
>  {
> -	void __user *p = (void __user *)arg;
>  	int __user *ip = p;
>  	int result, val, read_only;
> -	Sg_device *sdp;
> -	Sg_fd *sfp;
>  	Sg_request *srp;
>  	unsigned long iflags;
>  
> -	if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
> -		return -ENXIO;
> -
>  	SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
>  				   "sg_ioctl: cmd=0x%x\n", (int) cmd_in));
>  	read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
> @@ -1145,29 +1140,44 @@ sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
>  			cmd_in, filp->f_flags & O_NDELAY);
>  	if (result)
>  		return result;
> +
> +	return -ENOIOCTLCMD;
> +}
> +
> +static long
> +sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
> +{
> +	void __user *p = (void __user *)arg;
> +	Sg_device *sdp;
> +	Sg_fd *sfp;
> +	int ret;
> +
> +	if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
> +		return -ENXIO;
> +
> +	ret = sg_ioctl_common(filp, sdp, sfp, cmd_in, p);
> +	if (ret != -ENOIOCTLCMD)
> +		return ret;
> +
>  	return scsi_ioctl(sdp->device, cmd_in, p);
>  }
>  
>  #ifdef CONFIG_COMPAT
>  static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
>  {
> +	void __user *p = compat_ptr(arg);
>  	Sg_device *sdp;
>  	Sg_fd *sfp;
> -	struct scsi_device *sdev;
> +	int ret;
>  
>  	if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
>  		return -ENXIO;
>  
> -	sdev = sdp->device;
> -	if (sdev->host->hostt->compat_ioctl) { 
> -		int ret;
> -
> -		ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
> -
> +	ret = sg_ioctl_common(filp, sdp, sfp, cmd_in, p);
> +	if (ret != -ENOIOCTLCMD)
>  		return ret;
> -	}
> -	
> -	return -ENOIOCTLCMD;
> +
> +	return scsi_compat_ioctl(sdp->device, cmd_in, p);
>  }
>  #endif
>  
> diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
> index 4664fdf75c0f..6033a886c42c 100644
> --- a/drivers/scsi/sr.c
> +++ b/drivers/scsi/sr.c
> @@ -38,6 +38,7 @@
>  #include <linux/kernel.h>
>  #include <linux/mm.h>
>  #include <linux/bio.h>
> +#include <linux/compat.h>
>  #include <linux/string.h>
>  #include <linux/errno.h>
>  #include <linux/cdrom.h>
> @@ -598,6 +599,55 @@ static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
>  	return ret;
>  }
>  
> +#ifdef CONFIG_COMPAT
> +static int sr_block_compat_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
> +			  unsigned long arg)
> +{
> +	struct scsi_cd *cd = scsi_cd(bdev->bd_disk);
> +	struct scsi_device *sdev = cd->device;
> +	void __user *argp = compat_ptr(arg);
> +	int ret;
> +
> +	mutex_lock(&sr_mutex);
> +
> +	ret = scsi_ioctl_block_when_processing_errors(sdev, cmd,
> +			(mode & FMODE_NDELAY) != 0);
> +	if (ret)
> +		goto out;
> +
> +	scsi_autopm_get_device(sdev);
> +
> +	/*
> +	 * Send SCSI addressing ioctls directly to mid level, send other
> +	 * ioctls to cdrom/block level.
> +	 */
> +	switch (cmd) {
> +	case SCSI_IOCTL_GET_IDLUN:
> +	case SCSI_IOCTL_GET_BUS_NUMBER:
> +		ret = scsi_compat_ioctl(sdev, cmd, argp);
> +		goto put;
> +	}
> +
> +	/*
> +	 * CDROM ioctls are handled in the block layer, but
> +	 * do the scsi blk ioctls here.
> +	 */
> +	ret = scsi_cmd_blk_ioctl(bdev, mode, cmd, argp);
> +	if (ret != -ENOTTY)
> +		return ret;
> +
> +	ret = scsi_compat_ioctl(sdev, cmd, argp);
> +
> +put:
> +	scsi_autopm_put_device(sdev);
> +
> +out:
> +	mutex_unlock(&sr_mutex);
> +	return ret;
> +
> +}
> +#endif
> +
>  static unsigned int sr_block_check_events(struct gendisk *disk,
>  					  unsigned int clearing)
>  {
> @@ -641,12 +691,11 @@ static const struct block_device_operations sr_bdops =
>  	.open		= sr_block_open,
>  	.release	= sr_block_release,
>  	.ioctl		= sr_block_ioctl,
> +#ifdef CONFIG_COMPAT
> +	.ioctl		= sr_block_compat_ioctl,
> +#endif
>  	.check_events	= sr_block_check_events,
>  	.revalidate_disk = sr_block_revalidate_disk,
> -	/* 
> -	 * No compat_ioctl for now because sr_block_ioctl never
> -	 * seems to pass arbitrary ioctls down to host drivers.
> -	 */
>  };
>  
>  static int sr_open(struct cdrom_device_info *cdi, int purpose)
> diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c
> index 9e3fff2de83e..393f3019ccac 100644
> --- a/drivers/scsi/st.c
> +++ b/drivers/scsi/st.c
> @@ -3501,7 +3501,7 @@ static int partition_tape(struct scsi_tape *STp, int size)
>  
>  
>  /* The ioctl command */
> -static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
> +static long st_ioctl_common(struct file *file, unsigned int cmd_in, void __user *p)
>  {
>  	int i, cmd_nr, cmd_type, bt;
>  	int retval = 0;
> @@ -3509,7 +3509,6 @@ static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
>  	struct scsi_tape *STp = file->private_data;
>  	struct st_modedef *STm;
>  	struct st_partstat *STps;
> -	void __user *p = (void __user *)arg;
>  
>  	if (mutex_lock_interruptible(&STp->lock))
>  		return -ERESTARTSYS;
> @@ -3824,9 +3823,19 @@ static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
>  	}
>  	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;
> +			}
> +			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 ||
> @@ -3840,42 +3849,46 @@ static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
>  				return i;
>  			break;
>  	}
> -	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;
> +	return -ENOTTY;
>  
>   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;
> -	struct scsi_device *sdev = STp->device;
> -	int ret = -ENOIOCTLCMD;
> +	int ret;
>  
>  	/* argument conversion is handled using put_user_mtpos/put_user_mtget */
>  	switch (cmd_in) {
> -	case MTIOCTOP:
> -		return st_ioctl(file, MTIOCTOP, (unsigned long)p);
>  	case MTIOCPOS32:
> -		return st_ioctl(file, MTIOCPOS, (unsigned long)p);
> +		return st_ioctl_common(file, MTIOCPOS, p);
>  	case MTIOCGET32:
> -		return st_ioctl(file, MTIOCGET, (unsigned long)p);
> +		return st_ioctl_common(file, MTIOCGET, p);
>  	}
>  
> -	if (sdev->host->hostt->compat_ioctl) { 
> +	ret = st_ioctl_common(file, cmd_in, p);
> +	if (ret != -ENOTTY)
> +		return ret;
>  
> -		ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
> -
> -	}
> -	return ret;
> +	return scsi_compat_ioctl(STp->device, cmd_in, p);
>  }
>  #endif
>  
> diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
> index 358ea2ecf36b..ab4471f469e6 100644
> --- a/fs/compat_ioctl.c
> +++ b/fs/compat_ioctl.c
> @@ -36,109 +36,11 @@
>  
>  #include "internal.h"
>  
> -#ifdef CONFIG_BLOCK
> -#include <linux/cdrom.h>
> -#include <linux/fd.h>
> -#include <scsi/scsi.h>
> -#include <scsi/scsi_ioctl.h>
> -#include <scsi/sg.h>
> -#endif
> -
>  #include <linux/uaccess.h>
>  #include <linux/watchdog.h>
>  
>  #include <linux/hiddev.h>
>  
> -
> -#include <linux/sort.h>
> -
> -/*
> - * simple reversible transform to make our table more evenly
> - * distributed after sorting.
> - */
> -#define XFORM(i) (((i) ^ ((i) << 27) ^ ((i) << 17)) & 0xffffffff)
> -
> -#define COMPATIBLE_IOCTL(cmd) XFORM((u32)cmd),
> -static unsigned int ioctl_pointer[] = {
> -#ifdef CONFIG_BLOCK
> -/* Big S */
> -COMPATIBLE_IOCTL(SCSI_IOCTL_GET_IDLUN)
> -COMPATIBLE_IOCTL(SCSI_IOCTL_DOORLOCK)
> -COMPATIBLE_IOCTL(SCSI_IOCTL_DOORUNLOCK)
> -COMPATIBLE_IOCTL(SCSI_IOCTL_TEST_UNIT_READY)
> -COMPATIBLE_IOCTL(SCSI_IOCTL_GET_BUS_NUMBER)
> -COMPATIBLE_IOCTL(SCSI_IOCTL_SEND_COMMAND)
> -COMPATIBLE_IOCTL(SCSI_IOCTL_PROBE_HOST)
> -COMPATIBLE_IOCTL(SCSI_IOCTL_GET_PCI)
> -#endif
> -#ifdef CONFIG_BLOCK
> -/* SG stuff */
> -COMPATIBLE_IOCTL(SG_IO)
> -COMPATIBLE_IOCTL(SG_GET_REQUEST_TABLE)
> -COMPATIBLE_IOCTL(SG_SET_TIMEOUT)
> -COMPATIBLE_IOCTL(SG_GET_TIMEOUT)
> -COMPATIBLE_IOCTL(SG_EMULATED_HOST)
> -COMPATIBLE_IOCTL(SG_GET_TRANSFORM)
> -COMPATIBLE_IOCTL(SG_SET_RESERVED_SIZE)
> -COMPATIBLE_IOCTL(SG_GET_RESERVED_SIZE)
> -COMPATIBLE_IOCTL(SG_GET_SCSI_ID)
> -COMPATIBLE_IOCTL(SG_SET_FORCE_LOW_DMA)
> -COMPATIBLE_IOCTL(SG_GET_LOW_DMA)
> -COMPATIBLE_IOCTL(SG_SET_FORCE_PACK_ID)
> -COMPATIBLE_IOCTL(SG_GET_PACK_ID)
> -COMPATIBLE_IOCTL(SG_GET_NUM_WAITING)
> -COMPATIBLE_IOCTL(SG_SET_DEBUG)
> -COMPATIBLE_IOCTL(SG_GET_SG_TABLESIZE)
> -COMPATIBLE_IOCTL(SG_GET_COMMAND_Q)
> -COMPATIBLE_IOCTL(SG_SET_COMMAND_Q)
> -COMPATIBLE_IOCTL(SG_GET_VERSION_NUM)
> -COMPATIBLE_IOCTL(SG_NEXT_CMD_LEN)
> -COMPATIBLE_IOCTL(SG_SCSI_RESET)
> -COMPATIBLE_IOCTL(SG_GET_REQUEST_TABLE)
> -COMPATIBLE_IOCTL(SG_SET_KEEP_ORPHAN)
> -COMPATIBLE_IOCTL(SG_GET_KEEP_ORPHAN)
> -#endif
> -};
> -
> -/*
> - * Convert common ioctl arguments based on their command number
> - *
> - * Please do not add any code in here. Instead, implement
> - * a compat_ioctl operation in the place that handleѕ the
> - * ioctl for the native case.
> - */
> -static long do_ioctl_trans(unsigned int cmd,
> -		 unsigned long arg, struct file *file)
> -{
> -	return -ENOIOCTLCMD;
> -}
> -
> -static int compat_ioctl_check_table(unsigned int xcmd)
> -{
> -#ifdef CONFIG_BLOCK
> -	int i;
> -	const int max = ARRAY_SIZE(ioctl_pointer) - 1;
> -
> -	BUILD_BUG_ON(max >= (1 << 16));
> -
> -	/* guess initial offset into table, assuming a
> -	   normalized distribution */
> -	i = ((xcmd >> 16) * max) >> 16;
> -
> -	/* do linear search up first, until greater or equal */
> -	while (ioctl_pointer[i] < xcmd && i < max)
> -		i++;
> -
> -	/* then do linear search down */
> -	while (ioctl_pointer[i] > xcmd && i > 0)
> -		i--;
> -
> -	return ioctl_pointer[i] == xcmd;
> -#else
> -	return 0;
> -#endif
> -}
> -
>  COMPAT_SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd,
>  		       compat_ulong_t, arg32)
>  {
> @@ -216,19 +118,9 @@ COMPAT_SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd,
>  				goto out_fput;
>  		}
>  
> -		if (!f.file->f_op->unlocked_ioctl)
> -			goto do_ioctl;
> -		break;
> -	}
> -
> -	if (compat_ioctl_check_table(XFORM(cmd)))
> -		goto found_handler;
> -
> -	error = do_ioctl_trans(cmd, arg, f.file);
> -	if (error == -ENOIOCTLCMD)
>  		error = -ENOTTY;
> -
> -	goto out_fput;
> +		goto out_fput;
> +	}
>  
>   found_handler:
>  	arg = (unsigned long)compat_ptr(arg);
> @@ -239,23 +131,3 @@ COMPAT_SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd,
>   out:
>  	return error;
>  }
> -
> -static int __init init_sys32_ioctl_cmp(const void *p, const void *q)
> -{
> -	unsigned int a, b;
> -	a = *(unsigned int *)p;
> -	b = *(unsigned int *)q;
> -	if (a > b)
> -		return 1;
> -	if (a < b)
> -		return -1;
> -	return 0;
> -}
> -
> -static int __init init_sys32_ioctl(void)
> -{
> -	sort(ioctl_pointer, ARRAY_SIZE(ioctl_pointer), sizeof(*ioctl_pointer),
> -		init_sys32_ioctl_cmp, NULL);
> -	return 0;
> -}
> -__initcall(init_sys32_ioctl);
> -- 
> 2.20.0
Michael S. Tsirkin Dec. 12, 2019, 10:27 a.m. UTC | #5
On Thu, Dec 12, 2019 at 01:28:08AM +0100, Paolo Bonzini wrote:
> On 12/12/19 00:05, Michael S. Tsirkin wrote:
> >> @@ -405,6 +405,9 @@ static int virtblk_getgeo(struct block_device *bd, struct hd_geometry *geo)
> >>  
> >>  static const struct block_device_operations virtblk_fops = {
> >>  	.ioctl  = virtblk_ioctl,
> >> +#ifdef CONFIG_COMPAT
> >> +	.compat_ioctl = blkdev_compat_ptr_ioctl,
> >> +#endif
> >>  	.owner  = THIS_MODULE,
> >>  	.getgeo = virtblk_getgeo,
> >>  };
> > Hmm - is virtio blk lumped in with scsi things intentionally?
> 
> I think it's because the only ioctl for virtio-blk is SG_IO.

Oh right, I forgot about that one ...

>  It makes
> sense to lump it in with scsi, but I wouldn't mind getting rid of
> CONFIG_VIRTIO_BLK_SCSI altogether.
> 
> Paolo
Christoph Hellwig Dec. 12, 2019, 4:27 p.m. UTC | #6
On Thu, Dec 12, 2019 at 01:28:08AM +0100, Paolo Bonzini wrote:
> I think it's because the only ioctl for virtio-blk is SG_IO.  It makes
> sense to lump it in with scsi, but I wouldn't mind getting rid of
> CONFIG_VIRTIO_BLK_SCSI altogether.

CONFIG_VIRTIO_BLK_SCSI has been broken for about two years, as it
never set the QUEUE_FLAG_SCSI_PASSTHROUGH flag after that was
introduced.  I actually have a patch that I plan to send to remove
this support as it was a really idea to start with (speaking as
the person who had that idea back in the day).
Jens Axboe Dec. 12, 2019, 4:35 p.m. UTC | #7
On 12/12/19 9:27 AM, Christoph Hellwig wrote:
> On Thu, Dec 12, 2019 at 01:28:08AM +0100, Paolo Bonzini wrote:
>> I think it's because the only ioctl for virtio-blk is SG_IO.  It makes
>> sense to lump it in with scsi, but I wouldn't mind getting rid of
>> CONFIG_VIRTIO_BLK_SCSI altogether.
> 
> CONFIG_VIRTIO_BLK_SCSI has been broken for about two years, as it
> never set the QUEUE_FLAG_SCSI_PASSTHROUGH flag after that was
> introduced.  I actually have a patch that I plan to send to remove
> this support as it was a really idea to start with (speaking as
> the person who had that idea back in the day).

We had this very discussion two years ago, and we never got it removed.
Let's please get it done.

Patch
diff mbox series

diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index 7ffd719d89de..fbbf18ac1d5d 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -405,6 +405,9 @@  static int virtblk_getgeo(struct block_device *bd, struct hd_geometry *geo)
 
 static const struct block_device_operations virtblk_fops = {
 	.ioctl  = virtblk_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl = blkdev_compat_ptr_ioctl,
+#endif
 	.owner  = THIS_MODULE,
 	.getgeo = virtblk_getgeo,
 };
diff --git a/drivers/scsi/ch.c b/drivers/scsi/ch.c
index 76751d6c7f0d..ed5f4a6ae270 100644
--- a/drivers/scsi/ch.c
+++ b/drivers/scsi/ch.c
@@ -872,6 +872,10 @@  static long ch_ioctl_compat(struct file * file,
 			    unsigned int cmd, unsigned long arg)
 {
 	scsi_changer *ch = file->private_data;
+	int retval = scsi_ioctl_block_when_processing_errors(ch->device, cmd,
+							file->f_flags & O_NDELAY);
+	if (retval)
+		return retval;
 
 	switch (cmd) {
 	case CHIOGPARAMS:
@@ -883,7 +887,7 @@  static long ch_ioctl_compat(struct file * file,
 	case CHIOINITELEM:
 	case CHIOSVOLTAG:
 		/* compatible */
-		return ch_ioctl(file, cmd, arg);
+		return ch_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
 	case CHIOGSTATUS32:
 	{
 		struct changer_element_status32 ces32;
@@ -898,8 +902,7 @@  static long ch_ioctl_compat(struct file * file,
 		return ch_gstatus(ch, ces32.ces_type, data);
 	}
 	default:
-		// return scsi_ioctl_compat(ch->device, cmd, (void*)arg);
-		return -ENOIOCTLCMD;
+		return scsi_compat_ioctl(ch->device, cmd, compat_ptr(arg));
 
 	}
 }
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index cea625906440..5afb0046b12a 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -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;
-
-	error = scsi_verify_blk_ioctl(bdev, cmd);
-	if (error < 0)
-		return error;
+	int ret;
 
-	error = scsi_ioctl_block_when_processing_errors(sdev, cmd,
-			(mode & FMODE_NDELAY) != 0);
-	if (error)
-		return error;
+	ret = sd_ioctl_common(bdev, mode, cmd, p);
+	if (ret != -ENOTTY)
+		return ret;
 
-	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
 
diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index 985546aac236..08efcee7a34d 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -910,19 +910,14 @@  static int put_compat_request_table(struct compat_sg_req_info __user *o,
 #endif
 
 static long
-sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
+sg_ioctl_common(struct file *filp, Sg_device *sdp, Sg_fd *sfp,
+		unsigned int cmd_in, void __user *p)
 {
-	void __user *p = (void __user *)arg;
 	int __user *ip = p;
 	int result, val, read_only;
-	Sg_device *sdp;
-	Sg_fd *sfp;
 	Sg_request *srp;
 	unsigned long iflags;
 
-	if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
-		return -ENXIO;
-
 	SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
 				   "sg_ioctl: cmd=0x%x\n", (int) cmd_in));
 	read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
@@ -1145,29 +1140,44 @@  sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
 			cmd_in, filp->f_flags & O_NDELAY);
 	if (result)
 		return result;
+
+	return -ENOIOCTLCMD;
+}
+
+static long
+sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
+{
+	void __user *p = (void __user *)arg;
+	Sg_device *sdp;
+	Sg_fd *sfp;
+	int ret;
+
+	if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
+		return -ENXIO;
+
+	ret = sg_ioctl_common(filp, sdp, sfp, cmd_in, p);
+	if (ret != -ENOIOCTLCMD)
+		return ret;
+
 	return scsi_ioctl(sdp->device, cmd_in, p);
 }
 
 #ifdef CONFIG_COMPAT
 static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
 {
+	void __user *p = compat_ptr(arg);
 	Sg_device *sdp;
 	Sg_fd *sfp;
-	struct scsi_device *sdev;
+	int ret;
 
 	if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
 		return -ENXIO;
 
-	sdev = sdp->device;
-	if (sdev->host->hostt->compat_ioctl) { 
-		int ret;
-
-		ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
-
+	ret = sg_ioctl_common(filp, sdp, sfp, cmd_in, p);
+	if (ret != -ENOIOCTLCMD)
 		return ret;
-	}
-	
-	return -ENOIOCTLCMD;
+
+	return scsi_compat_ioctl(sdp->device, cmd_in, p);
 }
 #endif
 
diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
index 4664fdf75c0f..6033a886c42c 100644
--- a/drivers/scsi/sr.c
+++ b/drivers/scsi/sr.c
@@ -38,6 +38,7 @@ 
 #include <linux/kernel.h>
 #include <linux/mm.h>
 #include <linux/bio.h>
+#include <linux/compat.h>
 #include <linux/string.h>
 #include <linux/errno.h>
 #include <linux/cdrom.h>
@@ -598,6 +599,55 @@  static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
 	return ret;
 }
 
+#ifdef CONFIG_COMPAT
+static int sr_block_compat_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
+			  unsigned long arg)
+{
+	struct scsi_cd *cd = scsi_cd(bdev->bd_disk);
+	struct scsi_device *sdev = cd->device;
+	void __user *argp = compat_ptr(arg);
+	int ret;
+
+	mutex_lock(&sr_mutex);
+
+	ret = scsi_ioctl_block_when_processing_errors(sdev, cmd,
+			(mode & FMODE_NDELAY) != 0);
+	if (ret)
+		goto out;
+
+	scsi_autopm_get_device(sdev);
+
+	/*
+	 * Send SCSI addressing ioctls directly to mid level, send other
+	 * ioctls to cdrom/block level.
+	 */
+	switch (cmd) {
+	case SCSI_IOCTL_GET_IDLUN:
+	case SCSI_IOCTL_GET_BUS_NUMBER:
+		ret = scsi_compat_ioctl(sdev, cmd, argp);
+		goto put;
+	}
+
+	/*
+	 * CDROM ioctls are handled in the block layer, but
+	 * do the scsi blk ioctls here.
+	 */
+	ret = scsi_cmd_blk_ioctl(bdev, mode, cmd, argp);
+	if (ret != -ENOTTY)
+		return ret;
+
+	ret = scsi_compat_ioctl(sdev, cmd, argp);
+
+put:
+	scsi_autopm_put_device(sdev);
+
+out:
+	mutex_unlock(&sr_mutex);
+	return ret;
+
+}
+#endif
+
 static unsigned int sr_block_check_events(struct gendisk *disk,
 					  unsigned int clearing)
 {
@@ -641,12 +691,11 @@  static const struct block_device_operations sr_bdops =
 	.open		= sr_block_open,
 	.release	= sr_block_release,
 	.ioctl		= sr_block_ioctl,
+#ifdef CONFIG_COMPAT
+	.ioctl		= sr_block_compat_ioctl,
+#endif
 	.check_events	= sr_block_check_events,
 	.revalidate_disk = sr_block_revalidate_disk,
-	/* 
-	 * No compat_ioctl for now because sr_block_ioctl never
-	 * seems to pass arbitrary ioctls down to host drivers.
-	 */
 };
 
 static int sr_open(struct cdrom_device_info *cdi, int purpose)
diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c
index 9e3fff2de83e..393f3019ccac 100644
--- a/drivers/scsi/st.c
+++ b/drivers/scsi/st.c
@@ -3501,7 +3501,7 @@  static int partition_tape(struct scsi_tape *STp, int size)
 
 
 /* The ioctl command */
-static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
+static long st_ioctl_common(struct file *file, unsigned int cmd_in, void __user *p)
 {
 	int i, cmd_nr, cmd_type, bt;
 	int retval = 0;
@@ -3509,7 +3509,6 @@  static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
 	struct scsi_tape *STp = file->private_data;
 	struct st_modedef *STm;
 	struct st_partstat *STps;
-	void __user *p = (void __user *)arg;
 
 	if (mutex_lock_interruptible(&STp->lock))
 		return -ERESTARTSYS;
@@ -3824,9 +3823,19 @@  static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
 	}
 	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;
+			}
+			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 ||
@@ -3840,42 +3849,46 @@  static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
 				return i;
 			break;
 	}
-	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;
+	return -ENOTTY;
 
  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;
-	struct scsi_device *sdev = STp->device;
-	int ret = -ENOIOCTLCMD;
+	int ret;
 
 	/* argument conversion is handled using put_user_mtpos/put_user_mtget */
 	switch (cmd_in) {
-	case MTIOCTOP:
-		return st_ioctl(file, MTIOCTOP, (unsigned long)p);
 	case MTIOCPOS32:
-		return st_ioctl(file, MTIOCPOS, (unsigned long)p);
+		return st_ioctl_common(file, MTIOCPOS, p);
 	case MTIOCGET32:
-		return st_ioctl(file, MTIOCGET, (unsigned long)p);
+		return st_ioctl_common(file, MTIOCGET, p);
 	}
 
-	if (sdev->host->hostt->compat_ioctl) { 
+	ret = st_ioctl_common(file, cmd_in, p);
+	if (ret != -ENOTTY)
+		return ret;
 
-		ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
-
-	}
-	return ret;
+	return scsi_compat_ioctl(STp->device, cmd_in, p);
 }
 #endif
 
diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index 358ea2ecf36b..ab4471f469e6 100644
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -36,109 +36,11 @@ 
 
 #include "internal.h"
 
-#ifdef CONFIG_BLOCK
-#include <linux/cdrom.h>
-#include <linux/fd.h>
-#include <scsi/scsi.h>
-#include <scsi/scsi_ioctl.h>
-#include <scsi/sg.h>
-#endif
-
 #include <linux/uaccess.h>
 #include <linux/watchdog.h>
 
 #include <linux/hiddev.h>
 
-
-#include <linux/sort.h>
-
-/*
- * simple reversible transform to make our table more evenly
- * distributed after sorting.
- */
-#define XFORM(i) (((i) ^ ((i) << 27) ^ ((i) << 17)) & 0xffffffff)
-
-#define COMPATIBLE_IOCTL(cmd) XFORM((u32)cmd),
-static unsigned int ioctl_pointer[] = {
-#ifdef CONFIG_BLOCK
-/* Big S */
-COMPATIBLE_IOCTL(SCSI_IOCTL_GET_IDLUN)
-COMPATIBLE_IOCTL(SCSI_IOCTL_DOORLOCK)
-COMPATIBLE_IOCTL(SCSI_IOCTL_DOORUNLOCK)
-COMPATIBLE_IOCTL(SCSI_IOCTL_TEST_UNIT_READY)
-COMPATIBLE_IOCTL(SCSI_IOCTL_GET_BUS_NUMBER)
-COMPATIBLE_IOCTL(SCSI_IOCTL_SEND_COMMAND)
-COMPATIBLE_IOCTL(SCSI_IOCTL_PROBE_HOST)
-COMPATIBLE_IOCTL(SCSI_IOCTL_GET_PCI)
-#endif
-#ifdef CONFIG_BLOCK
-/* SG stuff */
-COMPATIBLE_IOCTL(SG_IO)
-COMPATIBLE_IOCTL(SG_GET_REQUEST_TABLE)
-COMPATIBLE_IOCTL(SG_SET_TIMEOUT)
-COMPATIBLE_IOCTL(SG_GET_TIMEOUT)
-COMPATIBLE_IOCTL(SG_EMULATED_HOST)
-COMPATIBLE_IOCTL(SG_GET_TRANSFORM)
-COMPATIBLE_IOCTL(SG_SET_RESERVED_SIZE)
-COMPATIBLE_IOCTL(SG_GET_RESERVED_SIZE)
-COMPATIBLE_IOCTL(SG_GET_SCSI_ID)
-COMPATIBLE_IOCTL(SG_SET_FORCE_LOW_DMA)
-COMPATIBLE_IOCTL(SG_GET_LOW_DMA)
-COMPATIBLE_IOCTL(SG_SET_FORCE_PACK_ID)
-COMPATIBLE_IOCTL(SG_GET_PACK_ID)
-COMPATIBLE_IOCTL(SG_GET_NUM_WAITING)
-COMPATIBLE_IOCTL(SG_SET_DEBUG)
-COMPATIBLE_IOCTL(SG_GET_SG_TABLESIZE)
-COMPATIBLE_IOCTL(SG_GET_COMMAND_Q)
-COMPATIBLE_IOCTL(SG_SET_COMMAND_Q)
-COMPATIBLE_IOCTL(SG_GET_VERSION_NUM)
-COMPATIBLE_IOCTL(SG_NEXT_CMD_LEN)
-COMPATIBLE_IOCTL(SG_SCSI_RESET)
-COMPATIBLE_IOCTL(SG_GET_REQUEST_TABLE)
-COMPATIBLE_IOCTL(SG_SET_KEEP_ORPHAN)
-COMPATIBLE_IOCTL(SG_GET_KEEP_ORPHAN)
-#endif
-};
-
-/*
- * Convert common ioctl arguments based on their command number
- *
- * Please do not add any code in here. Instead, implement
- * a compat_ioctl operation in the place that handleѕ the
- * ioctl for the native case.
- */
-static long do_ioctl_trans(unsigned int cmd,
-		 unsigned long arg, struct file *file)
-{
-	return -ENOIOCTLCMD;
-}
-
-static int compat_ioctl_check_table(unsigned int xcmd)
-{
-#ifdef CONFIG_BLOCK
-	int i;
-	const int max = ARRAY_SIZE(ioctl_pointer) - 1;
-
-	BUILD_BUG_ON(max >= (1 << 16));
-
-	/* guess initial offset into table, assuming a
-	   normalized distribution */
-	i = ((xcmd >> 16) * max) >> 16;
-
-	/* do linear search up first, until greater or equal */
-	while (ioctl_pointer[i] < xcmd && i < max)
-		i++;
-
-	/* then do linear search down */
-	while (ioctl_pointer[i] > xcmd && i > 0)
-		i--;
-
-	return ioctl_pointer[i] == xcmd;
-#else
-	return 0;
-#endif
-}
-
 COMPAT_SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd,
 		       compat_ulong_t, arg32)
 {
@@ -216,19 +118,9 @@  COMPAT_SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd,
 				goto out_fput;
 		}
 
-		if (!f.file->f_op->unlocked_ioctl)
-			goto do_ioctl;
-		break;
-	}
-
-	if (compat_ioctl_check_table(XFORM(cmd)))
-		goto found_handler;
-
-	error = do_ioctl_trans(cmd, arg, f.file);
-	if (error == -ENOIOCTLCMD)
 		error = -ENOTTY;
-
-	goto out_fput;
+		goto out_fput;
+	}
 
  found_handler:
 	arg = (unsigned long)compat_ptr(arg);
@@ -239,23 +131,3 @@  COMPAT_SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd,
  out:
 	return error;
 }
-
-static int __init init_sys32_ioctl_cmp(const void *p, const void *q)
-{
-	unsigned int a, b;
-	a = *(unsigned int *)p;
-	b = *(unsigned int *)q;
-	if (a > b)
-		return 1;
-	if (a < b)
-		return -1;
-	return 0;
-}
-
-static int __init init_sys32_ioctl(void)
-{
-	sort(ioctl_pointer, ARRAY_SIZE(ioctl_pointer), sizeof(*ioctl_pointer),
-		init_sys32_ioctl_cmp, NULL);
-	return 0;
-}
-__initcall(init_sys32_ioctl);