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null_blk: wire up timeouts 

This is needed to ensure that we actually handle timeouts.
Without it, the queue_mode=1 path will never call blk_add_timer(),
and the queue_mode=2 path will continually just return
EH_RESET_TIMER and we never actually complete the offending request.

This was used to test the new timeout code, and the changes around
killing off REQ_ATOM_COMPLETE.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2018-01-09 12:47:24 -07:00
parent 8abef10b3d
commit 5448aca41c
1 changed files with 16 additions and 0 deletions
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16
drivers/block/null_blk.c
View File

@ -1341,6 +1341,12 @@ static blk_qc_t null_queue_bio(struct request_queue *q, struct bio *bio)
return BLK_QC_T_NONE;
}
static enum blk_eh_timer_return null_rq_timed_out_fn(struct request *rq)
{
pr_info("null: rq %p timed out\n", rq);
return BLK_EH_HANDLED;
}
static int null_rq_prep_fn(struct request_queue *q, struct request *req)
{
struct nullb *nullb = q->queuedata;
@ -1371,6 +1377,12 @@ static void null_request_fn(struct request_queue *q)
}
}
static enum blk_eh_timer_return null_timeout_rq(struct request *rq, bool res)
{
pr_info("null: rq %p timed out\n", rq);
return BLK_EH_HANDLED;
}
static blk_status_t null_queue_rq(struct blk_mq_hw_ctx *hctx,
const struct blk_mq_queue_data *bd)
{
@ -1394,6 +1406,7 @@ static blk_status_t null_queue_rq(struct blk_mq_hw_ctx *hctx,
static const struct blk_mq_ops null_mq_ops = {
.queue_rq = null_queue_rq,
.complete = null_softirq_done_fn,
.timeout = null_timeout_rq,
};
static void cleanup_queue(struct nullb_queue *nq)
@ -1654,6 +1667,7 @@ static int null_add_dev(struct nullb_device *dev)
if (rv)
goto out_cleanup_queues;
nullb->tag_set->timeout = 5 * HZ;
nullb->q = blk_mq_init_queue(nullb->tag_set);
if (IS_ERR(nullb->q)) {
rv = -ENOMEM;
@ -1679,6 +1693,8 @@ static int null_add_dev(struct nullb_device *dev)
}
blk_queue_prep_rq(nullb->q, null_rq_prep_fn);
blk_queue_softirq_done(nullb->q, null_softirq_done_fn);
blk_queue_rq_timed_out(nullb->q, null_rq_timed_out_fn);
nullb->q->rq_timeout = 5 * HZ;
rv = init_driver_queues(nullb);
if (rv)
goto out_cleanup_blk_queue;