bcache: Hack around stuff that clones up to bi_max_vecs

Signed-off-by: Kent Overstreet <koverstreet@google.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/md/bcache/io.c b/drivers/md/bcache/io.c
index f565512f6fac..b4c0e28a7cd1 100644
--- a/drivers/md/bcache/io.c
+++ b/drivers/md/bcache/io.c
@@ -38,6 +38,15 @@ static void bch_generic_make_request_hack(struct bio *bio)
 		bio = clone;
 	}
 
+	/*
+	 * Hack, since drivers that clone bios clone up to bi_max_vecs, but our
+	 * bios might have had more than that (before we split them per device
+	 * limitations).
+	 *
+	 * To be taken out once immutable bvec stuff is in.
+	 */
+	bio->bi_max_vecs = bio->bi_vcnt;
+
 	generic_make_request(bio);
 }