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由 Kent Overstreet 提交于
Immutable biovecs changed the way bio segments are treated in such a way that bio_for_each_segment() cannot now do what we want for discard/write same bios, since bi_size means something completely different for them. Fortunately discard and write same bios never have more than a single biovec, so bio_for_each_segment() is unnecessary and not terribly meaningful for them, but we still have to special case them in a few places. Signed-off-by: NKent Overstreet <kmo@daterainc.com> Tested-by: NRichard W.M. Jones <rjones@redhat.com> Signed-off-by: NJens Axboe <axboe@fb.com>
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