scsi: move the writeable field from struct scsi_device to struct scsi_cd

We currently set the field in common code based on the device type,
but then only use it in the cdrom driver which also overrides the
value previously set in the generic code.

Just leave this entirely to the CDROM driver to make everyones life
simpler.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/scsi_scan.c

@@ -807,30 +807,6 @@ static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result,
 		sdev->removable = (inq_result[1] & 0x80) >> 7;
 	}
 
-	switch (sdev->type) {
-	case TYPE_RBC:
-	case TYPE_TAPE:
-	case TYPE_DISK:
-	case TYPE_PRINTER:
-	case TYPE_MOD:
-	case TYPE_PROCESSOR:
-	case TYPE_SCANNER:
-	case TYPE_MEDIUM_CHANGER:
-	case TYPE_ENCLOSURE:
-	case TYPE_COMM:
-	case TYPE_RAID:
-	case TYPE_OSD:
-		sdev->writeable = 1;
-		break;
-	case TYPE_ROM:
-	case TYPE_WORM:
-		sdev->writeable = 0;
-		break;
-	default:
-		sdev_printk(KERN_INFO, sdev, "unknown device type %d\n",
-			    sdev->type);
-	}
-
 	if (sdev->type == TYPE_RBC || sdev->type == TYPE_ROM) {
 		/* RBC and MMC devices can return SCSI-3 compliance and yet
 		 * still not support REPORT LUNS, so make them act as

drivers/scsi/sd.c

@@ -992,9 +992,6 @@ static int sd_setup_read_write_cmnd(struct scsi_cmnd *SCpnt)
 		}
 	}
 	if (rq_data_dir(rq) == WRITE) {
-		if (!sdp->writeable) {
-			goto out;
-		}
 		SCpnt->cmnd[0] = WRITE_6;
 
 		if (blk_integrity_rq(rq))

drivers/scsi/sr.c

@@ -435,7 +435,7 @@ static int sr_init_command(struct scsi_cmnd *SCpnt)
 	}
 
 	if (rq_data_dir(rq) == WRITE) {
-		if (!cd->device->writeable)
+		if (!cd->writeable)
 			goto out;
 		SCpnt->cmnd[0] = WRITE_10;
 		cd->cdi.media_written = 1;
@@ -927,7 +927,7 @@ static void get_capabilities(struct scsi_cd *cd)
 	 */
 	if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) !=
 			(CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) {
-		cd->device->writeable = 1;
+		cd->writeable = 1;
 	}
 
 	kfree(buffer);

drivers/scsi/sr.h

@@ -36,6 +36,7 @@ typedef struct scsi_cd {
 	struct scsi_device *device;
 	unsigned int vendor;	/* vendor code, see sr_vendor.c         */
 	unsigned long ms_offset;	/* for reading multisession-CD's        */
+	unsigned writeable : 1;
 	unsigned use:1;		/* is this device still supportable     */
 	unsigned xa_flag:1;	/* CD has XA sectors ? */
 	unsigned readcd_known:1;	/* drive supports READ_CD (0xbe) */

include/scsi/scsi_device.h

@@ -127,7 +127,6 @@ struct scsi_device {
 				 * pass settings from slave_alloc to scsi
 				 * core. */
 	unsigned int eh_timeout; /* Error handling timeout */
-	unsigned writeable:1;
 	unsigned removable:1;
 	unsigned changed:1;	/* Data invalid due to media change */
 	unsigned busy:1;	/* Used to prevent races */