We can eliminate the SCSI command timed out check entirely if the block
layer does this for us. The way to do this in block is to check how
long the request has been outstanding if a requeue is requested and
ending it if we've gone over retries * timeout.
This will also eliminate many cases in SCSI where we evade the command
timeout for various reasons (like initial success converted to requeue)
Signed-off-by: James Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>
---
Index: linux-2.6/block/blk-core.c
===================================================================
--- linux-2.6.orig/block/blk-core.c 2009-02-19 16:42:00.140427205 -0500
+++ linux-2.6/block/blk-core.c 2009-03-18 10:36:10.511526815 -0400
@@ -937,6 +937,8 @@ EXPORT_SYMBOL(blk_start_queueing);
*/
void blk_requeue_request(struct request_queue *q, struct request *rq)
{
+ unsigned long wait_for = (rq->retries + 1) * rq->timeout;
+
blk_delete_timer(rq);
blk_clear_rq_complete(rq);
trace_block_rq_requeue(q, rq);
@@ -944,7 +946,13 @@ void blk_requeue_request(struct request_
if (blk_rq_tagged(rq))
blk_queue_end_tag(q, rq);
- elv_requeue_request(q, rq);
+ if (time_before(rq->start_time + wait_for, jiffies)) {
+ printk(KERN_ERR "%s: timing out command, waited %lus\n",
+ rq->rq_disk ? rq->rq_disk->disk_name : "?",
+ wait_for/HZ);
+ blk_end_request(rq, -EIO, blk_rq_bytes(rq));
+ } else
+ elv_requeue_request(q, rq);
}
EXPORT_SYMBOL(blk_requeue_request);
--
To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
