block: Add bio_advance()
This is prep work for immutable bio vecs; we first want to centralize
where bvecs are modified.
Next two patches convert some existing code to use this function.
Signed-off-by: Kent Overstreet <koverstreet@google.com>
CC: Jens Axboe <axboe@kernel.dk>
diff --git a/include/linux/bio.h b/include/linux/bio.h
index 669b1cb..fcb4dba 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -248,6 +248,8 @@
struct request_queue;
extern int bio_phys_segments(struct request_queue *, struct bio *);
+extern void bio_advance(struct bio *, unsigned);
+
extern void bio_init(struct bio *);
extern void bio_reset(struct bio *);