From: Keith Busch Date: Tue, 22 Dec 2015 22:48:44 +0000 (-0700) Subject: block: Split bios on chunk boundaries X-Git-Tag: v4.4-rc8~6^2~3 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=d3805611130af9b911e908af9f67a3f64f4f0914;p=linux.git 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 Signed-off-by: Jens Axboe --- diff --git a/block/blk-merge.c b/block/blk-merge.c index e01405a3e8b3..e73846a3d08a 100644 --- 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; /*