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block: fix updating bio's front segment size 

When the current bvec can be merged to the 1st segment, the bio's front
segment size has to be updated.

However, dcebd75592 doesn't consider that case, then bio's front
segment size may not be correct.

This patch fixes this issue.

Cc: Christoph Hellwig <hch@lst.de>
Cc: Omar Sandoval <osandov@fb.com>
Fixes: dcebd75592 ("block: use bio_for_each_bvec() to compute multi-page bvec count")
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ming Lei 2019-03-02 16:43:44 +08:00 committed by Jens Axboe
parent dfc76d11dd
commit aaeee62c84
1 changed files with 8 additions and 0 deletions
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8
block/blk-merge.c
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@ -277,6 +277,9 @@ static struct bio *blk_bio_segment_split(struct request_queue *q,
bvprvp = &bvprv;
sectors += bv.bv_len >> 9;
if (nsegs == 1 && seg_size > front_seg_size)
front_seg_size = seg_size;
continue;
}
new_segment:
@ -401,6 +404,11 @@ static unsigned int __blk_recalc_rq_segments(struct request_queue *q,
seg_size += bv.bv_len;
bvprv = bv;
if (nr_phys_segs == 1 && seg_size >
front_seg_size)
front_seg_size = seg_size;
continue;
}
new_segment: