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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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3
block/genhd.c
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@@ -420,6 +420,9 @@ int __must_check device_add_disk(struct device *parent, struct gendisk *disk,
*/
elevator_init_mq(disk->queue);
/* Mark bdev as having a submit_bio, if needed */
disk->part0->bd_has_submit_bio = disk->fops->submit_bio != NULL;
/*
* If the driver provides an explicit major number it also must provide
* the number of minors numbers supported, and those will be used to