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blk-mq: split bitmap grow and resize case in blk_mq_update_nr_requests() 

No functional changes are intended, make code cleaner and prepare to fix
the grow case in following patches.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Nilay Shroff <nilay@linux.ibm.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
pull/1354/merge
Yu Kuai 2025-09-10 16:04:41 +08:00 committed by Jens Axboe
parent 7f2799c546
commit e632004044
1 changed files with 27 additions and 12 deletions
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39
block/blk-mq.c
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@ -4936,25 +4936,40 @@ int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr)
blk_mq_quiesce_queue(q);
if (blk_mq_is_shared_tags(set->flags)) {
/*
* Shared tags, for sched tags, we allocate max initially hence
* tags can't grow, see blk_mq_alloc_sched_tags().
*/
if (q->elevator)
blk_mq_tag_update_sched_shared_tags(q);
else
blk_mq_tag_resize_shared_tags(set, nr);
} else {
} else if (!q->elevator) {
/*
* Non-shared hardware tags, nr is already checked from
* queue_requests_store() and tags can't grow.
*/
queue_for_each_hw_ctx(q, hctx, i) {
if (!hctx->tags)
continue;
/*
* If we're using an MQ scheduler, just update the
* scheduler queue depth. This is similar to what the
* old code would do.
*/
if (hctx->sched_tags)
ret = blk_mq_tag_update_depth(hctx,
&hctx->sched_tags, nr);
else
ret = blk_mq_tag_update_depth(hctx,
&hctx->tags, nr);
sbitmap_queue_resize(&hctx->tags->bitmap_tags,
nr - hctx->tags->nr_reserved_tags);
}
} else if (nr <= q->elevator->et->nr_requests) {
/* Non-shared sched tags, and tags don't grow. */
queue_for_each_hw_ctx(q, hctx, i) {
if (!hctx->sched_tags)
continue;
sbitmap_queue_resize(&hctx->sched_tags->bitmap_tags,
nr - hctx->sched_tags->nr_reserved_tags);
}
} else {
/* Non-shared sched tags, and tags grow */
queue_for_each_hw_ctx(q, hctx, i) {
if (!hctx->sched_tags)
continue;
ret = blk_mq_tag_update_depth(hctx, &hctx->sched_tags,
nr);
if (ret)
goto out;
}