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block: allow bio_for_each_segment_all() to iterate over multi-page bvec

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This patch introduces one extra iterator variable to bio_for_each_segment_all(),
then we can allow bio_for_each_segment_all() to iterate over multi-page bvec.

Given it is just one mechannical & simple change on all bio_for_each_segment_all()
users, this patch does tree-wide change in one single patch, so that we can
avoid to use a temporary helper for this conversion.

Reviewed-by: Omar Sandoval <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Signed-off-by: Ming Lei <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Ming Lei 2019-02-15 19:13:19 +08:00 • committed by Jens Axboe
commit 6dc4f100c1
27 changed files with 127 additions and 46 deletions
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6
block/bounce.c
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@ -165,11 +165,12 @@ static void bounce_end_io(struct bio *bio, mempool_t *pool)
struct bio_vec *bvec, orig_vec;
int i;
struct bvec_iter orig_iter = bio_orig->bi_iter;
struct bvec_iter_all iter_all;
/*
* free up bounce indirect pages used
*/
bio_for_each_segment_all(bvec, bio, i) {
bio_for_each_segment_all(bvec, bio, i, iter_all) {
orig_vec = bio_iter_iovec(bio_orig, orig_iter);
if (bvec->bv_page != orig_vec.bv_page) {
dec_zone_page_state(bvec->bv_page, NR_BOUNCE);
@ -294,6 +295,7 @@ static void __blk_queue_bounce(struct request_queue *q, struct bio **bio_orig,
bool bounce = false;
int sectors = 0;
bool passthrough = bio_is_passthrough(*bio_orig);
struct bvec_iter_all iter_all;
bio_for_each_segment(from, *bio_orig, iter) {
if (i++ < BIO_MAX_PAGES)
@ -313,7 +315,7 @@ static void __blk_queue_bounce(struct request_queue *q, struct bio **bio_orig,
bio = bounce_clone_bio(*bio_orig, GFP_NOIO, passthrough ? NULL :
&bounce_bio_set);
bio_for_each_segment_all(to, bio, i) {
bio_for_each_segment_all(to, bio, i, iter_all) {
struct page *page = to->bv_page;
if (page_to_pfn(page) <= q->limits.bounce_pfn)