From 6126eb2483a8398329e662eaff5f103e832ed5cb Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Fri, 8 Jan 2016 09:00:29 -0700 Subject: [PATCH] Revert "block: Split bios on chunk boundaries" This reverts commit d3805611130af9b911e908af9f67a3f64f4f0914. If we end up splitting on the first segment, we don't adjust the sector count. That results in hitting a BUG() with attempting to split 0 sectors. As this is just a performance issue and not a regression since 4.3 release, let's just rever this change. That gives us more time to test a real fix for 4.5, which would be marked for stable anyway. --- block/blk-merge.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/block/blk-merge.c b/block/blk-merge.c index e73846a..e01405a 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) > blk_max_size_offset(q, bio->bi_iter.bi_sector)) + if (sectors + (bv.bv_len >> 9) > queue_max_sectors(q)) goto split; /* -- 2.7.4