Commit 7891f05c authored by Ming Lei's avatar Ming Lei Committed by Jens Axboe
Browse files

block: bounce: avoid direct access to bvec table 



We will support multipage bvecs in the future, so change to iterator way
for getting bv_page of bvec from original bio.

Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: default avatarMing Lei <ming.lei@redhat.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent c45a8f2d

block/bounce.c

+8 −9
Original line number Diff line number Diff line
@@ -137,22 +137,21 @@ static void copy_to_high_bio_irq(struct bio *to, struct bio *from) 
static void bounce_end_io(struct bio *bio, mempool_t *pool)

{

	struct bio *bio_orig = bio->bi_private;

	struct bio_vec *bvec, *org_vec;

	struct bio_vec *bvec, orig_vec;

	int i;

	int start = bio_orig->bi_iter.bi_idx;

	struct bvec_iter orig_iter = bio_orig->bi_iter;



	/*

	 * free up bounce indirect pages used

	 */

	bio_for_each_segment_all(bvec, bio, i) {

		org_vec = bio_orig->bi_io_vec + i + start;



		if (bvec->bv_page == org_vec->bv_page)

			continue;



		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);

			mempool_free(bvec->bv_page, pool);

		}

		bio_advance_iter(bio_orig, &orig_iter, orig_vec.bv_len);

	}



	bio_orig->bi_status = bio->bi_status;

	bio_endio(bio_orig);