[dm-devel] [RFC PATCH 3/3] block: improve detail in I/O error messages

[Mike Snitzer <snitzer redhat com>]

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

Signed-off-by: Mike Snitzer <snitzer redhat com>
---
 block/blk-core.c |   12 +++++++++---
 1 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/block/blk-core.c b/block/blk-core.c
index 4ce953f..ab8c776 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -2028,9 +2028,15 @@ 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 = "I/O";
+
+		if (error == -ENOLINK)
+			error_type = "recoverable transport";
+		else if (error == -EREMOTEIO)
+			error_type = "critical target";
+		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);
-- 
1.7.2.3