[SCSI] Return ENODATA on medium error

When a medium error is detected the SCSI stack should return
ENODATA to the upper layers.

[jejb: fix whitespace error]
Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

block/blk-core.c

@@ -2321,6 +2321,9 @@ bool blk_update_request(struct request *req, int error, unsigned int nr_bytes)
 		case -ENOSPC:
 			error_type = "critical space allocation";
 			break;
+		case -ENODATA:
+			error_type = "critical medium";
+			break;
 		case -EIO:
 		default:
 			error_type = "I/O";

drivers/md/dm-mpath.c

@@ -1261,6 +1261,20 @@ static void activate_path(struct work_struct *work)
 				pg_init_done, pgpath);
 }
 
+static int noretry_error(int error)
+{
+	switch (error) {
+	case -EOPNOTSUPP:
+	case -EREMOTEIO:
+	case -EILSEQ:
+	case -ENODATA:
+		return 1;
+	}
+
+	/* Anything else could be a path failure, so should be retried */
+	return 0;
+}
+
 /*
  * end_io handling
  */
@@ -1284,7 +1298,7 @@ static int do_end_io(struct multipath *m, struct request *clone,
 	if (!error && !clone->errors)
 		return 0;	/* I/O complete */
 
-	if (error == -EOPNOTSUPP || error == -EREMOTEIO || error == -EILSEQ)
+	if (noretry_error(error))
 		return error;
 
 	if (mpio->pgpath)

drivers/scsi/scsi_error.c

@@ -371,7 +371,7 @@ static int scsi_check_sense(struct scsi_cmnd *scmd)
 		if (sshdr.asc == 0x11 || /* UNRECOVERED READ ERR */
 		    sshdr.asc == 0x13 || /* AMNF DATA FIELD */
 		    sshdr.asc == 0x14) { /* RECORD NOT FOUND */
-			set_host_byte(scmd, DID_TARGET_FAILURE);
+			set_host_byte(scmd, DID_MEDIUM_ERROR);
 			return SUCCESS;
 		}
 		return NEEDS_RETRY;

drivers/scsi/scsi_lib.c

@@ -727,6 +727,7 @@ EXPORT_SYMBOL(scsi_release_buffers);
  * -EREMOTEIO	permanent target failure, do not retry
  * -EBADE	permanent nexus failure, retry on other path
  * -ENOSPC	No write space available
+ * -ENODATA	Medium error
  * -EIO		unspecified I/O error
  */
 static int __scsi_error_from_host_byte(struct scsi_cmnd *cmd, int result)
@@ -749,6 +750,10 @@ static int __scsi_error_from_host_byte(struct scsi_cmnd *cmd, int result)
 		set_host_byte(cmd, DID_OK);
 		error = -ENOSPC;
 		break;
+	case DID_MEDIUM_ERROR:
+		set_host_byte(cmd, DID_OK);
+		error = -ENODATA;
+		break;
 	default:
 		error = -EIO;
 		break;

include/scsi/scsi.h

@@ -458,6 +458,7 @@ static inline int scsi_is_wlun(unsigned int lun)
 #define DID_NEXUS_FAILURE 0x11  /* Permanent nexus failure, retry on other
 				 * paths might yield different results */
 #define DID_ALLOC_FAILURE 0x12  /* Space allocation on the device failed */
+#define DID_MEDIUM_ERROR  0x13  /* Medium error */
 #define DRIVER_OK       0x00	/* Driver status                           */
 
 /*