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MD: make bio mergeable
blk_queue_split marks bio unmergeable, which makes sense for normal bio. But if dispatching the bio to underlayer disk, the blk_queue_split checks are invalid, hence it's possible the bio becomes mergeable. In the reported bug, this bug causes trim against raid0 performance slash https://bugzilla.kernel.org/show_bug.cgi?id=117051 Reported-and-tested-by: Park Ju Hyung <email@example.com> Fixes: 6ac45ae(block: avoid to merge splitted bio) Cc: firstname.lastname@example.org (v4.3+) Cc: Ming Lei <email@example.com> Cc: Neil Brown <firstname.lastname@example.org> Reviewed-by: Jens Axboe <email@example.com> Signed-off-by: Shaohua Li <firstname.lastname@example.org>
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