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block: store bdev->bd_disk->fops->submit_bio state in bdev

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We have a long chain of memory dereferencing just to whether or not
this disk has a special submit_bio helper. As that's not necessarily
the common case, add a bd_has_submit_bio state in the bdev to avoid
traversing this memory dependency chain if we don't need to.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe
2023-04-14 07:32:02 -06:00
parent 3838c406a5
commit 9f4107b07b
4 changed files with 9 additions and 4 deletions
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8
block/blk-core.c
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@@ -587,14 +587,14 @@ static inline blk_status_t blk_check_zone_append(struct request_queue *q,
static void __submit_bio(struct bio *bio)
{
struct gendisk *disk = bio->bi_bdev->bd_disk;
if (unlikely(!blk_crypto_bio_prep(&bio)))
return;
if (!disk->fops->submit_bio) {
if (!bio->bi_bdev->bd_has_submit_bio) {
blk_mq_submit_bio(bio);
} else if (likely(bio_queue_enter(bio) == 0)) {
struct gendisk *disk = bio->bi_bdev->bd_disk;
disk->fops->submit_bio(bio);
blk_queue_exit(disk->queue);
}
@@ -698,7 +698,7 @@ void submit_bio_noacct_nocheck(struct bio *bio)
*/
if (current->bio_list)
bio_list_add(&current->bio_list[0], bio);
else if (!bio->bi_bdev->bd_disk->fops->submit_bio)
else if (!bio->bi_bdev->bd_has_submit_bio)
__submit_bio_noacct_mq(bio);
else
__submit_bio_noacct(bio);