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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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block/bdev.c
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@@ -419,6 +419,7 @@ struct block_device *bdev_alloc(struct gendisk *disk, u8 partno)
bdev->bd_inode = inode;
bdev->bd_queue = disk->queue;
bdev->bd_stats = alloc_percpu(struct disk_stats);
bdev->bd_has_submit_bio = false;
if (!bdev->bd_stats) {
iput(inode);
return NULL;