[SCSI] TYPE_RBC cache fixes (sbp2.c affected)

	a) TYPE_SDAD renamed to TYPE_RBC and taken to scsi.h
	b) in sbp2.c remapping of TYPE_RPB to TYPE_DISK turned off
	c) relevant places in midlayer and sd.c taught to accept TYPE_RBC
	d) sd.c::sd_read_cache_type() looks into page 6 when dealing with
TYPE_RBC - these guys have writeback cache flag there and are not guaranteed
to have page 8 at all.
	e) sd_read_cache_type() got an extra sanity check - it checks that
it got the page it asked for before using its contents.  And screams if
mismatch had happened.  Rationale: there are broken devices out there that
are "helpful" enough to go for "I don't have a page you've asked for, here,
have another one".  For example, PL3507 had been caught doing just that...
	f) sbp2 sets sdev->use_10_for_rw and sdev->use_10_for_ms instead
of bothering to remap READ6/WRITE6/MOD_SENSE, so most of the conversions
in there are gone now.

	Incidentally, I wonder if USB storage devices that have no
mode page 8 are simply RBC ones.  I haven't touched that, but it might
be interesting to check...
Signed-off-by: NAl Viro <viro@parcelfarce.linux.theplanet.co.uk>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

drivers/ieee1394/sbp2.c

@@ -1070,7 +1070,7 @@ static int sbp2_handle_physdma_read(struct hpsb_host *host, int nodeid, quadlet_
 static __inline__ int sbp2_command_conversion_device_type(u8 device_type)
 {
 	return (((device_type == TYPE_DISK) ||
-		 (device_type == TYPE_SDAD) ||
+		 (device_type == TYPE_RBC) ||
 		 (device_type == TYPE_ROM)) ? 1:0);
 }
 
@@ -2111,102 +2111,6 @@ static int sbp2_send_command(struct scsi_id_instance_data *scsi_id,
  */
 static void sbp2_check_sbp2_command(struct scsi_id_instance_data *scsi_id, unchar *cmd)
 {
-	unchar new_cmd[16];
-	u8 device_type = SBP2_DEVICE_TYPE (scsi_id->sbp2_device_type_and_lun);
-
-	SBP2_DEBUG("sbp2_check_sbp2_command");
-
-	switch (*cmd) {
-
-		case READ_6:
-
-			if (sbp2_command_conversion_device_type(device_type)) {
-
-				SBP2_DEBUG("Convert READ_6 to READ_10");
-
-				/*
-				 * Need to turn read_6 into read_10
-				 */
-				new_cmd[0] = 0x28;
-				new_cmd[1] = (cmd[1] & 0xe0);
-				new_cmd[2] = 0x0;
-				new_cmd[3] = (cmd[1] & 0x1f);
-				new_cmd[4] = cmd[2];
-				new_cmd[5] = cmd[3];
-				new_cmd[6] = 0x0;
-				new_cmd[7] = 0x0;
-				new_cmd[8] = cmd[4];
-				new_cmd[9] = cmd[5];
-
-				memcpy(cmd, new_cmd, 10);
-
-			}
-
-			break;
-
-		case WRITE_6:
-
-			if (sbp2_command_conversion_device_type(device_type)) {
-
-				SBP2_DEBUG("Convert WRITE_6 to WRITE_10");
-
-				/*
-				 * Need to turn write_6 into write_10
-				 */
-				new_cmd[0] = 0x2a;
-				new_cmd[1] = (cmd[1] & 0xe0);
-				new_cmd[2] = 0x0;
-				new_cmd[3] = (cmd[1] & 0x1f);
-				new_cmd[4] = cmd[2];
-				new_cmd[5] = cmd[3];
-				new_cmd[6] = 0x0;
-				new_cmd[7] = 0x0;
-				new_cmd[8] = cmd[4];
-				new_cmd[9] = cmd[5];
-
-				memcpy(cmd, new_cmd, 10);
-
-			}
-
-			break;
-
-		case MODE_SENSE:
-
-			if (sbp2_command_conversion_device_type(device_type)) {
-
-				SBP2_DEBUG("Convert MODE_SENSE_6 to MODE_SENSE_10");
-
-				/*
-				 * Need to turn mode_sense_6 into mode_sense_10
-				 */
-				new_cmd[0] = 0x5a;
-				new_cmd[1] = cmd[1];
-				new_cmd[2] = cmd[2];
-				new_cmd[3] = 0x0;
-				new_cmd[4] = 0x0;
-				new_cmd[5] = 0x0;
-				new_cmd[6] = 0x0;
-				new_cmd[7] = 0x0;
-				new_cmd[8] = cmd[4];
-				new_cmd[9] = cmd[5];
-
-				memcpy(cmd, new_cmd, 10);
-
-			}
-
-			break;
-
-		case MODE_SELECT:
-
-			/*
-			 * TODO. Probably need to change mode select to 10 byte version
-			 */
-
-		default:
-			break;
-	}
-
-	return;
 }
 
 /*
@@ -2271,14 +2175,6 @@ static void sbp2_check_sbp2_response(struct scsi_id_instance_data *scsi_id,
 				scsi_buf[4] = 36 - 5;
 			}
 
-			/*
-			 * Check for Simple Direct Access Device and change it to TYPE_DISK
-			 */
-			if ((scsi_buf[0] & 0x1f) == TYPE_SDAD) {
-				SBP2_DEBUG("Changing TYPE_SDAD to TYPE_DISK");
-				scsi_buf[0] &= 0xe0;
-			}
-
 			/*
 			 * Fix ansi revision and response data format
 			 */
@@ -2287,27 +2183,6 @@ static void sbp2_check_sbp2_response(struct scsi_id_instance_data *scsi_id,
 
 			break;
 
-		case MODE_SENSE:
-
-			if (sbp2_command_conversion_device_type(device_type)) {
-
-				SBP2_DEBUG("Modify mode sense response (10 byte version)");
-
-				scsi_buf[0] = scsi_buf[1];	/* Mode data length */
-				scsi_buf[1] = scsi_buf[2];	/* Medium type */
-				scsi_buf[2] = scsi_buf[3];	/* Device specific parameter */
-				scsi_buf[3] = scsi_buf[7];	/* Block descriptor length */
-				memcpy(scsi_buf + 4, scsi_buf + 8, scsi_buf[0]);
-			}
-
-			break;
-
-		case MODE_SELECT:
-
-			/*
-			 * TODO. Probably need to change mode select to 10 byte version
-			 */
-
 		default:
 			break;
 	}
@@ -2690,7 +2565,8 @@ static void sbp2scsi_complete_command(struct scsi_id_instance_data *scsi_id,
 static int sbp2scsi_slave_configure (struct scsi_device *sdev)
 {
 	blk_queue_dma_alignment(sdev->request_queue, (512 - 1));
-
+	sdev->use_10_for_rw = 1;
+	sdev->use_10_for_ms = 1;
 	return 0;
 }
 

drivers/ieee1394/sbp2.h

@@ -266,10 +266,6 @@ struct sbp2_status_block {
 #define SBP2_MAX_UDS_PER_NODE		16	/* Maximum scsi devices per node */
 #define SBP2_MAX_SECTORS		255	/* Max sectors supported */
 
-#ifndef TYPE_SDAD
-#define TYPE_SDAD			0x0e	/* simplified direct access device */
-#endif
-
 /*
  * SCSI direction table...
  * (now used as a back-up in case the direction passed down from above is "unknown")

drivers/scsi/scsi_scan.c

@@ -625,6 +625,7 @@ static int scsi_add_lun(struct scsi_device *sdev, char *inq_result, int *bflags)
 	case TYPE_MEDIUM_CHANGER:
 	case TYPE_ENCLOSURE:
 	case TYPE_COMM:
+	case TYPE_RBC:
 		sdev->writeable = 1;
 		break;
 	case TYPE_WORM:

drivers/scsi/sd.c

@@ -1368,17 +1368,26 @@ sd_read_write_protect_flag(struct scsi_disk *sdkp, char *diskname,
  */
 static void
 sd_read_cache_type(struct scsi_disk *sdkp, char *diskname,
-		   struct scsi_request *SRpnt, unsigned char *buffer) {
+		   struct scsi_request *SRpnt, unsigned char *buffer)
+{
 	int len = 0, res;
 
-	const int dbd = 0;	   /* DBD */
-	const int modepage = 0x08; /* current values, cache page */
+	int dbd;
+	int modepage;
 	struct scsi_mode_data data;
 	struct scsi_sense_hdr sshdr;
 
 	if (sdkp->device->skip_ms_page_8)
 		goto defaults;
 
+	if (sdkp->device->type == TYPE_RBC) {
+		modepage = 6;
+		dbd = 8;
+	} else {
+		modepage = 8;
+		dbd = 0;
+	}
+
 	/* cautiously ask */
 	res = sd_do_mode_sense(SRpnt, dbd, modepage, buffer, 4, &data);
 
@@ -1409,11 +1418,20 @@ sd_read_cache_type(struct scsi_disk *sdkp, char *diskname,
 			"write back, no read (daft)"
 		};
 		int ct = 0;
-		int offset = data.header_length +
-			data.block_descriptor_length + 2;
+		int offset = data.header_length + data.block_descriptor_length;
 
-		sdkp->WCE = ((buffer[offset] & 0x04) != 0);
-		sdkp->RCD = ((buffer[offset] & 0x01) != 0);
+		if ((buffer[offset] & 0x3f) != modepage) {
+			printk(KERN_ERR "%s: got wrong page\n", diskname);
+			goto defaults;
+		}
+
+		if (modepage == 8) {
+			sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
+			sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
+		} else {
+			sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
+			sdkp->RCD = 0;
+		}
 
 		ct =  sdkp->RCD + 2*sdkp->WCE;
 
@@ -1533,7 +1551,7 @@ static int sd_probe(struct device *dev)
 	int error;
 
 	error = -ENODEV;
-	if ((sdp->type != TYPE_DISK) && (sdp->type != TYPE_MOD))
+	if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
 		goto out;
 
 	SCSI_LOG_HLQUEUE(3, printk("sd_attach: scsi device: <%d,%d,%d,%d>\n", 
@@ -1570,7 +1588,7 @@ static int sd_probe(struct device *dev)
 	sdkp->openers = 0;
 
 	if (!sdp->timeout) {
-		if (sdp->type == TYPE_DISK)
+		if (sdp->type != TYPE_MOD)
 			sdp->timeout = SD_TIMEOUT;
 		else
 			sdp->timeout = SD_MOD_TIMEOUT;

include/scsi/scsi.h

@@ -213,6 +213,7 @@ static inline int scsi_status_is_good(int status)
 #define TYPE_COMM           0x09    /* Communications device */
 #define TYPE_ENCLOSURE      0x0d    /* Enclosure Services Device */
 #define TYPE_RAID           0x0c
+#define TYPE_RBC	    0x0e
 #define TYPE_NO_LUN         0x7f
 
 /*