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



Hello.

On 08-12-2010 2:16, Mike Snitzer wrote:

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

Signed-off-by: Mike Snitzer<snitzer redhat com>
[...]

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";

   *switch* would be more natural here.

WBR, Sergei


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