dm: fix clone_bio() to trigger blk_recount_segments()

commit 57c36519e4b949f89381053f7283f5d605595b42 upstream.

DM's clone_bio() now benefits from using bio_trim() by fixing the fact
that clone_bio() wasn't clearing BIO_SEG_VALID like bio_trim() does;
which triggers blk_recount_segments() via bio_phys_segments().
Reviewed-by: NMing Lei <ming.lei@redhat.com>
Signed-off-by: NMike Snitzer <snitzer@redhat.com>
Signed-off-by: NJoseph Qi <joseph.qi@linux.alibaba.com>
Signed-off-by: NShile Zhang <shile.zhang@linux.alibaba.com>
Acked-by: NCaspar Zhang <caspar@linux.alibaba.com>

drivers/md/dm.c

@@ -1315,7 +1315,7 @@ static int clone_bio(struct dm_target_io *tio, struct bio *bio,
 
 	__bio_clone_fast(clone, bio);
 
-	if (unlikely(bio_integrity(bio) != NULL)) {
+	if (bio_integrity(bio)) {
 		int r;
 
 		if (unlikely(!dm_target_has_integrity(tio->ti->type) &&
@@ -1331,12 +1331,7 @@ static int clone_bio(struct dm_target_io *tio, struct bio *bio,
 			return r;
 	}
 
-	if (bio_op(bio) != REQ_OP_ZONE_REPORT)
-		bio_advance(clone, to_bytes(sector - clone->bi_iter.bi_sector));
-	clone->bi_iter.bi_size = to_bytes(len);
-
-	if (unlikely(bio_integrity(bio) != NULL))
-		bio_integrity_trim(clone);
+	bio_trim(clone, sector - clone->bi_iter.bi_sector, len);
 
 	return 0;
 }