block: Bring back zero_fill_bio_iter

This reverts 6f822e1b5d9dda3d20e87365de138046e3baa03a - this helper is
used by bcachefs.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: linux-block@vger.kernel.org
Link: https://lore.kernel.org/r/20230813182636.2966159-4-kent.overstreet@linux.dev
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/bio.c b/block/bio.c
index be484d8..816d412 100644 (file)
--- a/block/bio.c
+++ b/block/bio.c
@@ -606,15 +606,15 @@ struct bio *bio_kmalloc(unsigned short nr_vecs, gfp_t gfp_mask)
 }
 EXPORT_SYMBOL(bio_kmalloc);
 
-void zero_fill_bio(struct bio *bio)
+void zero_fill_bio_iter(struct bio *bio, struct bvec_iter start)
 {
        struct bio_vec bv;
        struct bvec_iter iter;
 
-       bio_for_each_segment(bv, bio, iter)
+       __bio_for_each_segment(bv, bio, iter, start)
                memzero_bvec(&bv);
 }
-EXPORT_SYMBOL(zero_fill_bio);
+EXPORT_SYMBOL(zero_fill_bio_iter);
 
 /**
  * bio_truncate - truncate the bio to small size of @new_size

diff --git a/include/linux/bio.h b/include/linux/bio.h
index c4f5b52..8b99210 100644 (file)
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -488,7 +488,12 @@ extern void bio_copy_data_iter(struct bio *dst, struct bvec_iter *dst_iter,
 extern void bio_copy_data(struct bio *dst, struct bio *src);
 extern void bio_free_pages(struct bio *bio);
 void guard_bio_eod(struct bio *bio);
-void zero_fill_bio(struct bio *bio);
+void zero_fill_bio_iter(struct bio *bio, struct bvec_iter iter);
+
+static inline void zero_fill_bio(struct bio *bio)
+{
+       zero_fill_bio_iter(bio, bio->bi_iter);
+}
 
 static inline void bio_release_pages(struct bio *bio, bool mark_dirty)
 {