* [PATCH] block: set make_request_fn manually in blk_mq_update_nr_hw_queues
@ 2017-02-10 18:03 Josef Bacik
2017-02-10 18:15 ` Jens Axboe
0 siblings, 1 reply; 2+ messages in thread
From: Josef Bacik @ 2017-02-10 18:03 UTC (permalink / raw)
To: axboe, linux-block, kernel-team
Calling blk_queue_make_request resets a bunch of settings on the
request_queue, but all we really want is to update the make_request_fn,
so do this directly so we don't lose things like the logical and
physical block sizes.
Signed-off-by: Josef Bacik <jbacik@fb.com>
---
block/blk-mq.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/block/blk-mq.c b/block/blk-mq.c
index be183e61..eccbb13 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -2627,10 +2627,14 @@ void blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set, int nr_hw_queues)
list_for_each_entry(q, &set->tag_list, tag_set_list) {
blk_mq_realloc_hw_ctxs(set, q);
+ /*
+ * Manually set the make_request_fn as blk_queue_make_request
+ * resets a lot of the queue settings.
+ */
if (q->nr_hw_queues > 1)
- blk_queue_make_request(q, blk_mq_make_request);
+ q->make_request_fn = blk_mq_make_request;
else
- blk_queue_make_request(q, blk_sq_make_request);
+ q->make_request_fn = blk_sq_make_request;
blk_mq_queue_reinit(q, cpu_online_mask);
}
--
2.7.4
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] block: set make_request_fn manually in blk_mq_update_nr_hw_queues
2017-02-10 18:03 [PATCH] block: set make_request_fn manually in blk_mq_update_nr_hw_queues Josef Bacik
@ 2017-02-10 18:15 ` Jens Axboe
0 siblings, 0 replies; 2+ messages in thread
From: Jens Axboe @ 2017-02-10 18:15 UTC (permalink / raw)
To: Josef Bacik, axboe, linux-block, kernel-team
On 02/10/2017 11:03 AM, Josef Bacik wrote:
> Calling blk_queue_make_request resets a bunch of settings on the
> request_queue, but all we really want is to update the make_request_fn,
> so do this directly so we don't lose things like the logical and
> physical block sizes.
Applied, thanks Josef.
--
Jens Axboe
^ permalink raw reply [flat|nested] 2+ messages in thread
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2017-02-10 18:03 [PATCH] block: set make_request_fn manually in blk_mq_update_nr_hw_queues Josef Bacik
2017-02-10 18:15 ` Jens Axboe
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