blk-mq: switch ->queue_rq return value to blk_status_t
Use the same values for use for request completion errors as the return
value from ->queue_rq. BLK_STS_RESOURCE is special cased to cause
a requeue, and all the others are completed as-is.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/block/blk-mq.c b/block/blk-mq.c
index adcc1c0..7af78b1 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -924,7 +924,7 @@ bool blk_mq_dispatch_rq_list(struct request_queue *q, struct list_head *list)
{
struct blk_mq_hw_ctx *hctx;
struct request *rq;
- int errors, queued, ret = BLK_MQ_RQ_QUEUE_OK;
+ int errors, queued;
if (list_empty(list))
return false;
@@ -935,6 +935,7 @@ bool blk_mq_dispatch_rq_list(struct request_queue *q, struct list_head *list)
errors = queued = 0;
do {
struct blk_mq_queue_data bd;
+ blk_status_t ret;
rq = list_first_entry(list, struct request, queuelist);
if (!blk_mq_get_driver_tag(rq, &hctx, false)) {
@@ -975,25 +976,20 @@ bool blk_mq_dispatch_rq_list(struct request_queue *q, struct list_head *list)
}
ret = q->mq_ops->queue_rq(hctx, &bd);
- switch (ret) {
- case BLK_MQ_RQ_QUEUE_OK:
- queued++;
- break;
- case BLK_MQ_RQ_QUEUE_BUSY:
+ if (ret == BLK_STS_RESOURCE) {
blk_mq_put_driver_tag_hctx(hctx, rq);
list_add(&rq->queuelist, list);
__blk_mq_requeue_request(rq);
break;
- default:
- pr_err("blk-mq: bad return on queue: %d\n", ret);
- case BLK_MQ_RQ_QUEUE_ERROR:
- errors++;
- blk_mq_end_request(rq, BLK_STS_IOERR);
- break;
}
- if (ret == BLK_MQ_RQ_QUEUE_BUSY)
- break;
+ if (unlikely(ret != BLK_STS_OK)) {
+ errors++;
+ blk_mq_end_request(rq, BLK_STS_IOERR);
+ continue;
+ }
+
+ queued++;
} while (!list_empty(list));
hctx->dispatched[queued_to_index(queued)]++;
@@ -1031,7 +1027,7 @@ bool blk_mq_dispatch_rq_list(struct request_queue *q, struct list_head *list)
* - blk_mq_run_hw_queue() checks whether or not a queue has
* been stopped before rerunning a queue.
* - Some but not all block drivers stop a queue before
- * returning BLK_MQ_RQ_QUEUE_BUSY. Two exceptions are scsi-mq
+ * returning BLK_STS_RESOURCE. Two exceptions are scsi-mq
* and dm-rq.
*/
if (!blk_mq_sched_needs_restart(hctx) &&
@@ -1410,7 +1406,7 @@ static void __blk_mq_try_issue_directly(struct request *rq, blk_qc_t *cookie,
};
struct blk_mq_hw_ctx *hctx;
blk_qc_t new_cookie;
- int ret;
+ blk_status_t ret;
if (q->elevator)
goto insert;
@@ -1426,18 +1422,19 @@ static void __blk_mq_try_issue_directly(struct request *rq, blk_qc_t *cookie,
* would have done
*/
ret = q->mq_ops->queue_rq(hctx, &bd);
- if (ret == BLK_MQ_RQ_QUEUE_OK) {
+ switch (ret) {
+ case BLK_STS_OK:
*cookie = new_cookie;
return;
- }
-
- if (ret == BLK_MQ_RQ_QUEUE_ERROR) {
+ case BLK_STS_RESOURCE:
+ __blk_mq_requeue_request(rq);
+ goto insert;
+ default:
*cookie = BLK_QC_T_NONE;
- blk_mq_end_request(rq, BLK_STS_IOERR);
+ blk_mq_end_request(rq, ret);
return;
}
- __blk_mq_requeue_request(rq);
insert:
blk_mq_sched_insert_request(rq, false, true, false, may_sleep);
}
