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由 Kent Overstreet 提交于
Immutable biovecs changed the way biovecs are interpreted - drivers no longer use bi_vcnt, they have to go by bi_iter.bi_size (to allow for using part of an existing segment without modifying it). This breaks with discards and write_same bios, since for those bi_size has nothing to do with segments in the biovec. So for now, we need a fairly gross hack - we fortunately know that there will never be more than one segment for the entire request, so we can special case discard/write_same. Signed-off-by: NKent Overstreet <kmo@daterainc.com> Tested-by: NHugh Dickins <hughd@google.com> Signed-off-by: NJens Axboe <axboe@fb.com>
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