Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759192AbdLRM3J (ORCPT ); Mon, 18 Dec 2017 07:29:09 -0500 Received: from mx1.redhat.com ([209.132.183.28]:41914 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759157AbdLRM3E (ORCPT ); Mon, 18 Dec 2017 07:29:04 -0500 From: Ming Lei To: Jens Axboe , Christoph Hellwig , Alexander Viro , Kent Overstreet Cc: Huang Ying , linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, "Theodore Ts'o" , "Darrick J . Wong" , Coly Li , Filipe Manana , Ming Lei Subject: [PATCH V4 23/45] fs/buffer.c: use bvec iterator to truncate the bio Date: Mon, 18 Dec 2017 20:22:25 +0800 Message-Id: <20171218122247.3488-24-ming.lei@redhat.com> In-Reply-To: <20171218122247.3488-1-ming.lei@redhat.com> References: <20171218122247.3488-1-ming.lei@redhat.com> X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.30]); Mon, 18 Dec 2017 12:29:04 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 728 Lines: 26 Once multipage bvec is enabled, the last bvec may include more than one page, this patch use segment_last_page() to truncate the bio. Signed-off-by: Ming Lei --- fs/buffer.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/fs/buffer.c b/fs/buffer.c index 8b26295a56fe..83fa7fda000b 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -3050,7 +3050,10 @@ void guard_bio_eod(int op, struct bio *bio) /* ..and clear the end of the buffer for reads */ if (op == REQ_OP_READ) { - zero_user(bvec->bv_page, bvec->bv_offset + bvec->bv_len, + struct bio_vec bv; + + segment_last_page(bvec, &bv); + zero_user(bv.bv_page, bv.bv_offset + bv.bv_len, truncated_bytes); } } -- 2.9.5