diff options
Diffstat (limited to 'block')
| -rw-r--r-- | block/bio.c | 44 |
1 files changed, 24 insertions, 20 deletions
diff --git a/block/bio.c b/block/bio.c index ca845e440526..e849efff4616 100644 --- a/block/bio.c +++ b/block/bio.c @@ -530,20 +530,20 @@ err_free: } EXPORT_SYMBOL(bio_alloc_bioset); -void zero_fill_bio(struct bio *bio) +void zero_fill_bio_iter(struct bio *bio, struct bvec_iter start) { unsigned long flags; struct bio_vec bv; struct bvec_iter iter; - bio_for_each_segment(bv, bio, iter) { + __bio_for_each_segment(bv, bio, iter, start) { char *data = bvec_kmap_irq(&bv, &flags); memset(data, 0, bv.bv_len); flush_dcache_page(bv.bv_page); bvec_kunmap_irq(data, &flags); } } -EXPORT_SYMBOL(zero_fill_bio); +EXPORT_SYMBOL(zero_fill_bio_iter); /** * bio_put - release a reference to a bio @@ -971,28 +971,13 @@ void bio_advance(struct bio *bio, unsigned bytes) } EXPORT_SYMBOL(bio_advance); -/** - * bio_copy_data - copy contents of data buffers from one chain of bios to - * another - * @src: source bio list - * @dst: destination bio list - * - * If @src and @dst are single bios, bi_next must be NULL - otherwise, treats - * @src and @dst as linked lists of bios. - * - * Stops when it reaches the end of either @src or @dst - that is, copies - * min(src->bi_size, dst->bi_size) bytes (or the equivalent for lists of bios). - */ -void bio_copy_data(struct bio *dst, struct bio *src) +void bio_copy_data_iter(struct bio *dst, struct bvec_iter dst_iter, + struct bio *src, struct bvec_iter src_iter) { - struct bvec_iter src_iter, dst_iter; struct bio_vec src_bv, dst_bv; void *src_p, *dst_p; unsigned bytes; - src_iter = src->bi_iter; - dst_iter = dst->bi_iter; - while (1) { if (!src_iter.bi_size) { src = src->bi_next; @@ -1029,6 +1014,25 @@ void bio_copy_data(struct bio *dst, struct bio *src) bio_advance_iter(dst, &dst_iter, bytes); } } +EXPORT_SYMBOL(bio_copy_data_iter); + +/** + * bio_copy_data - copy contents of data buffers from one chain of bios to + * another + * @src: source bio list + * @dst: destination bio list + * + * If @src and @dst are single bios, bi_next must be NULL - otherwise, treats + * @src and @dst as linked lists of bios. + * + * Stops when it reaches the end of either @src or @dst - that is, copies + * min(src->bi_size, dst->bi_size) bytes (or the equivalent for lists of bios). + */ +void bio_copy_data(struct bio *dst, struct bio *src) +{ + bio_copy_data_iter(dst, dst->bi_iter, + src, src->bi_iter); +} EXPORT_SYMBOL(bio_copy_data); struct bio_map_data { |