blk-merge: fix blk_bio_segment_split
Commit bdced438(block: setup bi_phys_segments after splitting) introduces function of computing bio->bi_phys_segments during bio splitting. Unfortunately both bio->bi_seg_front_size and bio->bi_seg_back_size arn't computed, so too many physical segments may be obtained for one request since both the two are used to check if one segment across two bios can be possible. This patch fixes the issue by computing the two variables in blk_bio_segment_split(). Fixes: bdced438(block: setup bi_phys_segments after splitting) Reported-by: NMichael Ellerman <mpe@ellerman.id.au> Reported-by: NMark Salter <msalter@redhat.com> Tested-by: NLaurent Dufour <ldufour@linux.vnet.ibm.com> Tested-by: NMark Salter <msalter@redhat.com> Signed-off-by: NMing Lei <ming.lei@canonical.com> Signed-off-by: NJens Axboe <axboe@fb.com>
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