Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752643AbdHHItd (ORCPT ); Tue, 8 Aug 2017 04:49:33 -0400 Received: from mx1.redhat.com ([209.132.183.28]:38889 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751464AbdHHItb (ORCPT ); Tue, 8 Aug 2017 04:49:31 -0400 DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com E353872D0E Authentication-Results: ext-mx03.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx03.extmail.prod.ext.phx2.redhat.com; spf=fail smtp.mailfrom=ming.lei@redhat.com 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 v3 16/49] block: bounce: don't access bio->bi_io_vec in copy_to_high_bio_irq Date: Tue, 8 Aug 2017 16:45:15 +0800 Message-Id: <20170808084548.18963-17-ming.lei@redhat.com> In-Reply-To: <20170808084548.18963-1-ming.lei@redhat.com> References: <20170808084548.18963-1-ming.lei@redhat.com> X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.27]); Tue, 08 Aug 2017 08:49:31 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1562 Lines: 51 As we need to support multipage bvecs, so don't access bio->bi_io_vec in copy_to_high_bio_irq(), and just use the standard iterator to do that. Signed-off-by: Ming Lei --- block/bounce.c | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-) diff --git a/block/bounce.c b/block/bounce.c index e57cf2bdcd27..50e965a15295 100644 --- a/block/bounce.c +++ b/block/bounce.c @@ -112,24 +112,30 @@ int init_emergency_isa_pool(void) static void copy_to_high_bio_irq(struct bio *to, struct bio *from) { unsigned char *vfrom; - struct bio_vec tovec, *fromvec = from->bi_io_vec; + struct bio_vec tovec, fromvec; struct bvec_iter iter; + /* + * The bio of @from is created by bounce, so we can iterate + * its bvec from start to end, but the @from->bi_iter can't be + * trusted because it might be changed by splitting. + */ + struct bvec_iter from_iter = BVEC_ITER_ALL_INIT; bio_for_each_segment(tovec, to, iter) { - if (tovec.bv_page != fromvec->bv_page) { + fromvec = bio_iter_iovec(from, from_iter); + if (tovec.bv_page != fromvec.bv_page) { /* * fromvec->bv_offset and fromvec->bv_len might have * been modified by the block layer, so use the original * copy, bounce_copy_vec already uses tovec->bv_len */ - vfrom = page_address(fromvec->bv_page) + + vfrom = page_address(fromvec.bv_page) + tovec.bv_offset; bounce_copy_vec(&tovec, vfrom); flush_dcache_page(tovec.bv_page); } - - fromvec++; + bio_advance_iter(from, &from_iter, tovec.bv_len); } } -- 2.9.4