scsi: sd_zbc: Improve report zones error printout

In the case of a report zones command failure, instead of simply printing
the host_byte and driver_byte values returned, print a message that is more
human readable and useful, adding sense codes too.

To do so, use the already defined sd_print_sense_hdr() and
sd_print_result() functions by moving the declaration of these functions
into sd.h.

Link: https://lore.kernel.org/r/20191125070518.951717-1-damien.lemoal@wdc.com
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/sd.c

@@ -122,8 +122,6 @@ static void sd_eh_reset(struct scsi_cmnd *);
 static int sd_eh_action(struct scsi_cmnd *, int);
 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
 static void scsi_disk_release(struct device *cdev);
-static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
-static void sd_print_result(const struct scsi_disk *, const char *, int);
 
 static DEFINE_IDA(sd_index_ida);
 
@@ -3704,15 +3702,13 @@ static void __exit exit_sd(void)
 module_init(init_sd);
 module_exit(exit_sd);
 
-static void sd_print_sense_hdr(struct scsi_disk *sdkp,
-			       struct scsi_sense_hdr *sshdr)
+void sd_print_sense_hdr(struct scsi_disk *sdkp, struct scsi_sense_hdr *sshdr)
 {
 	scsi_print_sense_hdr(sdkp->device,
 			     sdkp->disk ? sdkp->disk->disk_name : NULL, sshdr);
 }
 
-static void sd_print_result(const struct scsi_disk *sdkp, const char *msg,
-			    int result)
+void sd_print_result(const struct scsi_disk *sdkp, const char *msg, int result)
 {
 	const char *hb_string = scsi_hostbyte_string(result);
 	const char *db_string = scsi_driverbyte_string(result);
@@ -3727,4 +3723,3 @@ static void sd_print_result(const struct scsi_disk *sdkp, const char *msg,
 			  "%s: Result: hostbyte=0x%02x driverbyte=0x%02x\n",
 			  msg, host_byte(result), driver_byte(result));
 }
-

drivers/scsi/sd.h

@@ -239,4 +239,7 @@ static inline void sd_zbc_complete(struct scsi_cmnd *cmd,
 
 #endif /* CONFIG_BLK_DEV_ZONED */
 
+void sd_print_sense_hdr(struct scsi_disk *sdkp, struct scsi_sense_hdr *sshdr);
+void sd_print_result(const struct scsi_disk *sdkp, const char *msg, int result);
+
 #endif /* _SCSI_DISK_H */

drivers/scsi/sd_zbc.c

@@ -87,9 +87,11 @@ static int sd_zbc_do_report_zones(struct scsi_disk *sdkp, unsigned char *buf,
 				  timeout, SD_MAX_RETRIES, NULL);
 	if (result) {
 		sd_printk(KERN_ERR, sdkp,
-			  "REPORT ZONES lba %llu failed with %d/%d\n",
-			  (unsigned long long)lba,
-			  host_byte(result), driver_byte(result));
+			  "REPORT ZONES start lba %llu failed\n", lba);
+		sd_print_result(sdkp, "REPORT ZONES", result);
+		if (driver_byte(result) == DRIVER_SENSE &&
+		    scsi_sense_valid(&sshdr))
+			sd_print_sense_hdr(sdkp, &sshdr);
 		return -EIO;
 	}