scsi: scsi_ioctl: Call scsi_cmd_ioctl() from scsi_ioctl()

Ensure SCSI ULD only has to call a single ioctl helper.  This also adds a
bunch of missing ioctls to the ch driver, and removes the need for a
duplicate implementation of SCSI_IOCTL_SEND_COMMAND command.

Link: https://lore.kernel.org/r/20210724072033.1284840-12-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/ch.c

@@ -877,7 +877,7 @@ static long ch_ioctl(struct file *file,
 	}
 
 	default:
-		return scsi_ioctl(ch->device, cmd, argp);
+		return scsi_ioctl(ch->device, NULL, file->f_mode, cmd, argp);
 
 	}
 }

drivers/scsi/scsi_ioctl.c

@@ -192,17 +192,22 @@ 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
+ * @disk: disk receiving the ioctl
+ * @mode: mode the block/char device is opened with
  * @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 scsi_ioctl(struct scsi_device *sdev, struct gendisk *disk, fmode_t mode,
+		int cmd, void __user *arg)
 {
+	struct request_queue *q = sdev->request_queue;
 	char scsi_cmd[MAX_COMMAND_SIZE];
 	struct scsi_sense_hdr sense_hdr;
+	int error;
 
 	/* Check for deprecated ioctls ... all the ioctls which don't
 	 * follow the new unique numbering scheme are deprecated */
@@ -220,6 +225,12 @@ int scsi_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
 		break;
 	}
 
+	if (cmd != SCSI_IOCTL_GET_IDLUN && cmd != SCSI_IOCTL_GET_BUS_NUMBER) {
+		error = scsi_cmd_ioctl(q, disk, mode, cmd, arg);
+		if (error != -ENOTTY)
+			return error;
+	}
+
 	switch (cmd) {
 	case SCSI_IOCTL_GET_IDLUN: {
 		struct scsi_idlun v = {
@@ -237,10 +248,6 @@ int scsi_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
 		return put_user(sdev->host->host_no, (int __user *)arg);
 	case SCSI_IOCTL_PROBE_HOST:
 		return ioctl_probe(sdev->host, arg);
-	case SCSI_IOCTL_SEND_COMMAND:
-		if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
-			return -EACCES;
-		return sg_scsi_ioctl(sdev->request_queue, NULL, 0, arg);
 	case SCSI_IOCTL_DOORLOCK:
 		return scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
 	case SCSI_IOCTL_DOORUNLOCK:

drivers/scsi/sd.c

@@ -1571,23 +1571,7 @@ static int sd_ioctl(struct block_device *bdev, fmode_t mode,
 
 	if (is_sed_ioctl(cmd))
 		return sed_ioctl(sdkp->opal_dev, cmd, p);
-
-	/*
-	 * Send SCSI addressing ioctls directly to mid level, send other
-	 * ioctls to block level and then onto mid level if they can't be
-	 * resolved.
-	 */
-	switch (cmd) {
-	case SCSI_IOCTL_GET_IDLUN:
-	case SCSI_IOCTL_GET_BUS_NUMBER:
-		break;
-	default:
-		error = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, p);
-		if (error != -ENOTTY)
-			return error;
-	}
-
-	return scsi_ioctl(sdp, cmd, p);
+	return scsi_ioctl(sdp, disk, mode, cmd, p);
 }
 
 static void set_media_not_present(struct scsi_disk *sdkp)

drivers/scsi/sg.c

@@ -1165,7 +1165,7 @@ sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
 	ret = sg_ioctl_common(filp, sdp, sfp, cmd_in, p);
 	if (ret != -ENOIOCTLCMD)
 		return ret;
-	return scsi_ioctl(sdp->device, cmd_in, p);
+	return scsi_ioctl(sdp->device, NULL, filp->f_mode, cmd_in, p);
 }
 
 static __poll_t

drivers/scsi/sr.c

@@ -574,24 +574,12 @@ static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
 
 	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:
-		break;
-	default:
-		ret = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, argp);
-		if (ret != -ENOTTY)
-			goto put;
+	if (ret != CDROMCLOSETRAY && ret != CDROMEJECT) {
 		ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg);
 		if (ret != -ENOSYS)
 			goto put;
 	}
-
-	ret = scsi_ioctl(sdev, cmd, argp);
+	ret = scsi_ioctl(sdev, disk, mode, cmd, argp);
 
 put:
 	scsi_autopm_put_device(sdev);

drivers/scsi/st.c

@@ -3823,24 +3823,16 @@ static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
 	mutex_unlock(&STp->lock);
 
 	switch (cmd_in) {
-	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;
 		break;
 	}
 
-	retval = scsi_ioctl(STp->device, cmd_in, p);
+	retval = scsi_ioctl(STp->device, STp->disk, file->f_mode, cmd_in, p);
 	if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) {
 		/* unload */
 		STp->rew_at_close = 0;

include/scsi/scsi_ioctl.h

@@ -18,6 +18,7 @@
 
 #ifdef __KERNEL__
 
+struct gendisk;
 struct scsi_device;
 
 /*
@@ -43,7 +44,8 @@ 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 *);
+int scsi_ioctl(struct scsi_device *sdev, struct gendisk *disk, fmode_t mode,
+		int cmd, void __user *arg);
 
 #endif /* __KERNEL__ */
 #endif /* _SCSI_IOCTL_H */