block: Split bios on chunk boundaries

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 <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
gem5 · Dec 23, 2015 · d380561 · d380561
1 parent 24bc3ea
commit d380561
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/block/blk-merge.c b/block/blk-merge.c
@@ -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;
 
 		/*