__bio_clone: don't calculate hw/phys segment counts
If the users sets a new ->bi_bdev on the bio after __bio_clone() has
returned it, the "segment counts valid" flag still remains even though
it may be different with the new target. So don't calculate segment
counts in __bio_clone().
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/fs/bio.c b/fs/bio.c
index d59ddbf..242e409 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -248,11 +248,13 @@
*/
void __bio_clone(struct bio *bio, struct bio *bio_src)
{
- struct request_queue *q = bdev_get_queue(bio_src->bi_bdev);
-
memcpy(bio->bi_io_vec, bio_src->bi_io_vec,
bio_src->bi_max_vecs * sizeof(struct bio_vec));
+ /*
+ * most users will be overriding ->bi_bdev with a new target,
+ * so we don't set nor calculate new physical/hw segment counts here
+ */
bio->bi_sector = bio_src->bi_sector;
bio->bi_bdev = bio_src->bi_bdev;
bio->bi_flags |= 1 << BIO_CLONED;
@@ -260,8 +262,6 @@
bio->bi_vcnt = bio_src->bi_vcnt;
bio->bi_size = bio_src->bi_size;
bio->bi_idx = bio_src->bi_idx;
- bio_phys_segments(q, bio);
- bio_hw_segments(q, bio);
}
/**