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block: don't merge adjacent bvecs to one segment in bio blk_queue_split

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For normal filesystem IO, each page is added via blk_add_page(),
in which bvec(page) merge has been handled already, and basically
not possible to merge two adjacent bvecs in one bio.

So not try to merge two adjacent bvecs in blk_queue_split().

Cc: Omar Sandoval <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Reviewed-by: Boris Ostrovsky <[email protected]>
Signed-off-by: Ming Lei <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Ming Lei 2019-03-17 18:01:05 +08:00 • committed by Jens Axboe
commit fd7d8d4232
1 changed files with 0 additions and 17 deletions
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17
block/blk-merge.c
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@ -267,23 +267,6 @@ static struct bio *blk_bio_segment_split(struct request_queue *q,
goto split;
}
if (bvprvp) {
if (seg_size + bv.bv_len > queue_max_segment_size(q))
goto new_segment;
if (!biovec_phys_mergeable(q, bvprvp, &bv))
goto new_segment;
seg_size += bv.bv_len;
bvprv = bv;
bvprvp = &bvprv;
sectors += bv.bv_len >> 9;
if (nsegs == 1 && seg_size > front_seg_size)
front_seg_size = seg_size;
continue;
}
new_segment:
if (nsegs == max_segs)
goto split;