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block: Split bios on chunk boundaries

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For h/w that advertise their block storage's underlying chunk size, it's
a big performance win to not submit commands that cross them. This patch
uses that criteria if it is provided. If it is not provided, this patch
uses the max sectors as before.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Keith Busch 2015-12-22 15:48:44 -07:00 committed by Jens Axboe
parent 24bc3ea5df
commit d380561113
1 changed files with 1 additions and 1 deletions
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2
block/blk-merge.c
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@ -81,7 +81,7 @@ static struct bio *blk_bio_segment_split(struct request_queue *q,
struct bio *new = NULL;
bio_for_each_segment(bv, bio, iter) {
if (sectors + (bv.bv_len >> 9) > queue_max_sectors(q))
if (sectors + (bv.bv_len >> 9) > blk_max_size_offset(q, bio->bi_iter.bi_sector))
goto split;
/*