scsi: ratelimit I/O error messages

There can be quite a lot of I/O error messages, even on smaller
machines. So we need to ratelimit them to not overwhelm logging.
Signed-off-by: Hannes Reinecke <hare@suse.de>
Tested-by: Robert Elliott <elliott@hp.com>
Reviewed-by: Robert Elliott <elliott@hp.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

drivers/scsi/scsi_lib.c

@@ -22,6 +22,7 @@
 #include <linux/hardirq.h>
 #include <linux/scatterlist.h>
 #include <linux/blk-mq.h>
+#include <linux/ratelimit.h>
 
 #include <scsi/scsi.h>
 #include <scsi/scsi_cmnd.h>
@@ -1038,19 +1039,26 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes)
 	switch (action) {
 	case ACTION_FAIL:
 		/* Give up and fail the remainder of the request */
+		if (!(req->cmd_flags & REQ_QUIET)) {
+			static DEFINE_RATELIMIT_STATE(_rs,
+					DEFAULT_RATELIMIT_INTERVAL,
+					DEFAULT_RATELIMIT_BURST);
+
 			if (unlikely(scsi_logging_level))
-			level = SCSI_LOG_LEVEL(SCSI_LOG_MLQUEUE_SHIFT,
-					       SCSI_LOG_MLQUEUE_BITS);
+				level = SCSI_LOG_LEVEL(SCSI_LOG_MLCOMPLETE_SHIFT,
+						       SCSI_LOG_MLCOMPLETE_BITS);
+
 			/*
 			 * if logging is enabled the failure will be printed
 			 * in scsi_log_completion(), so avoid duplicate messages
 			 */
-		if (!level && !(req->cmd_flags & REQ_QUIET)) {
+			if (!level && __ratelimit(&_rs)) {
 				scsi_print_result(cmd, NULL, FAILED);
 				if (driver_byte(result) & DRIVER_SENSE)
 					scsi_print_sense(cmd);
 				scsi_print_command(cmd);
 			}
+		}
 		if (!scsi_end_request(req, error, blk_rq_err_bytes(req), 0))
 			return;
 		/*FALLTHRU*/