From: Hannes Reinecke <hare@suse.de>
Date: Tue, 18 Jan 2011 09:13:13 +0000 (+0100)
Subject: [SCSI] block: improve detail in I/O error messages
X-Git-Tag: v2.6.39-rc1~440^2~127
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=79775567e0439ca47eb9f501e52c4b713d44cf89;p=profile%2Fivi%2Fkernel-x86-ivi.git

[SCSI] block: improve detail in I/O error messages

Classify severity of I/O errors for target, nexus, and
transport errors.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Hannes Reinecke <hare@suse.de>
Acked-by: Jens Axboe <jaxboe@fusionio.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
---

diff --git a/block/blk-core.c b/block/blk-core.c
index 2f4002f..b3cf121 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -2044,9 +2044,26 @@ bool blk_update_request(struct request *req, int error, unsigned int nr_bytes)
 
 	if (error && req->cmd_type == REQ_TYPE_FS &&
 	    !(req->cmd_flags & REQ_QUIET)) {
-		printk(KERN_ERR "end_request: I/O error, dev %s, sector %llu\n",
-				req->rq_disk ? req->rq_disk->disk_name : "?",
-				(unsigned long long)blk_rq_pos(req));
+		char *error_type;
+
+		switch (error) {
+		case -ENOLINK:
+			error_type = "recoverable transport";
+			break;
+		case -EREMOTEIO:
+			error_type = "critical target";
+			break;
+		case -EBADE:
+			error_type = "critical nexus";
+			break;
+		case -EIO:
+		default:
+			error_type = "I/O";
+			break;
+		}
+		printk(KERN_ERR "end_request: %s error, dev %s, sector %llu\n",
+		       error_type, req->rq_disk ? req->rq_disk->disk_name : "?",
+		       (unsigned long long)blk_rq_pos(req));
 	}
 
 	blk_account_io_completion(req, nr_bytes);