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| author | Kent Overstreet <kent.overstreet@gmail.com> | 2018-05-08 21:33:53 -0400 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2018-05-14 13:16:08 -0600 |
| commit | 38a72dac48f631c2a90b831a3847cde116f21d3a (patch) | |
| tree | 0db49d64f2f0813ef9ddd29cf4040bcbed6d7ba9 /block | |
| parent | f4f8154a08bc5801a3f130db69e370d249e791ab (diff) | |
| download | linux-38a72dac48f631c2a90b831a3847cde116f21d3a.tar.bz2 | |
block: Add bio_copy_data_iter(), zero_fill_bio_iter()
Add versions that take bvec_iter args instead of using bio->bi_iter - to
be used by bcachefs.
Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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 { |