From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Ming Lei To: Jens Axboe , Christoph Hellwig , Huang Ying , Andrew Morton , Alexander Viro Cc: linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, Ming Lei Subject: [PATCH v2 16/51] block: bounce: avoid direct access to bvec table Date: Mon, 26 Jun 2017 20:09:59 +0800 Message-Id: <20170626121034.3051-17-ming.lei@redhat.com> In-Reply-To: <20170626121034.3051-1-ming.lei@redhat.com> References: <20170626121034.3051-1-ming.lei@redhat.com> Sender: owner-linux-mm@kvack.org List-ID: We will support multipage bvecs in the future, so change to iterator way for getting bv_page of bvec from original bio. Signed-off-by: Ming Lei --- block/bounce.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/block/bounce.c b/block/bounce.c index 916ee9a9a216..4eea1b2d8618 100644 --- a/block/bounce.c +++ b/block/bounce.c @@ -135,21 +135,22 @@ 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) + goto next; dec_zone_page_state(bvec->bv_page, NR_BOUNCE); mempool_free(bvec->bv_page, pool); + next: + bio_advance_iter(bio_orig, &orig_iter, orig_vec.bv_len); } bio_orig->bi_status = bio->bi_status; -- 2.9.4 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org