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compat_ioctl: add scsi_compat_ioctl

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In order to move the compat handling for SCSI ioctl commands out of
fs/compat_ioctl.c into the individual drivers, we need a helper function
first to match the native ioctl handler called by sd, sr, st, etc.

Reviewed-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Arnd Bergmann 2019-03-15 16:45:16 +01:00
parent 9452b1a3ed
commit 7eafd1373b
2 changed files with 41 additions and 14 deletions
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54
drivers/scsi/scsi_ioctl.c
View File

@ -189,17 +189,7 @@ static int scsi_ioctl_get_pci(struct scsi_device *sdev, void __user *arg)
}
/**
* scsi_ioctl - Dispatch ioctl to scsi device
* @sdev: scsi device receiving ioctl
* @cmd: which ioctl is it
* @arg: data associated with ioctl
*
* Description: The scsi_ioctl() function differs from most ioctls in that it
* does not take a major/minor number as the dev field. Rather, it takes
* a pointer to a &struct scsi_device.
*/
int scsi_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
static int scsi_ioctl_common(struct scsi_device *sdev, int cmd, void __user *arg)
{
char scsi_cmd[MAX_COMMAND_SIZE];
struct scsi_sense_hdr sense_hdr;
@ -266,14 +256,50 @@ int scsi_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
return scsi_ioctl_get_pci(sdev, arg);
case SG_SCSI_RESET:
return scsi_ioctl_reset(sdev, arg);
default:
if (sdev->host->hostt->ioctl)
return sdev->host->hostt->ioctl(sdev, cmd, arg);
}
return -ENOIOCTLCMD;
}
/**
* scsi_ioctl - Dispatch ioctl to scsi device
* @sdev: scsi device receiving ioctl
* @cmd: which ioctl is it
* @arg: data associated with ioctl
*
* Description: The scsi_ioctl() function differs from most ioctls in that it
* does not take a major/minor number as the dev field. Rather, it takes
* a pointer to a &struct scsi_device.
*/
int scsi_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
{
int ret = scsi_ioctl_common(sdev, cmd, arg);
if (ret != -ENOIOCTLCMD)
return ret;
if (sdev->host->hostt->ioctl)
return sdev->host->hostt->ioctl(sdev, cmd, arg);
return -EINVAL;
}
EXPORT_SYMBOL(scsi_ioctl);
#ifdef CONFIG_COMPAT
int scsi_compat_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
{
int ret = scsi_ioctl_common(sdev, cmd, arg);
if (ret != -ENOIOCTLCMD)
return ret;
if (sdev->host->hostt->compat_ioctl)
return sdev->host->hostt->compat_ioctl(sdev, cmd, arg);
return ret;
}
EXPORT_SYMBOL(scsi_compat_ioctl);
#endif
/*
* We can process a reset even when a device isn't fully operable.
*/

1
include/scsi/scsi_ioctl.h
View File

@ -44,6 +44,7 @@ typedef struct scsi_fctargaddress {
int scsi_ioctl_block_when_processing_errors(struct scsi_device *sdev,
int cmd, bool ndelay);
extern int scsi_ioctl(struct scsi_device *, int, void __user *);
extern int scsi_compat_ioctl(struct scsi_device *sdev, int cmd, void __user *arg);
#endif /* __KERNEL__ */
#endif /* _SCSI_IOCTL_H */