From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 04264C43441 for ; Fri, 9 Nov 2018 16:27:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CB75120825 for ; Fri, 9 Nov 2018 16:27:19 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CB75120825 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728719AbeKJCIe (ORCPT ); Fri, 9 Nov 2018 21:08:34 -0500 Received: from mx1.redhat.com ([209.132.183.28]:10148 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728311AbeKJCIe (ORCPT ); Fri, 9 Nov 2018 21:08:34 -0500 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 6B3257F6C7; Fri, 9 Nov 2018 16:27:17 +0000 (UTC) Received: from localhost (ovpn-8-16.pek2.redhat.com [10.72.8.16]) by smtp.corp.redhat.com (Postfix) with ESMTP id 769A160CD6; Fri, 9 Nov 2018 16:27:14 +0000 (UTC) From: Ming Lei To: Jens Axboe Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, Ming Lei , Christoph Hellwig Subject: [PATCH V8 09/18] block: introduce bio_bvecs() Date: Sat, 10 Nov 2018 00:26:01 +0800 Message-Id: <20181109162610.18981-10-ming.lei@redhat.com> In-Reply-To: <20181109162610.18981-1-ming.lei@redhat.com> References: <20181109162610.18981-1-ming.lei@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.25]); Fri, 09 Nov 2018 16:27:17 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org There are still cases in which we need to use bio_bvecs() for get the number of multi-page segment, so introduce it. Cc: Christoph Hellwig Signed-off-by: Ming Lei --- include/linux/bio.h | 30 +++++++++++++++++++++++++----- 1 file changed, 25 insertions(+), 5 deletions(-) diff --git a/include/linux/bio.h b/include/linux/bio.h index 1f0dcf109841..3496c816946e 100644 --- a/include/linux/bio.h +++ b/include/linux/bio.h @@ -196,7 +196,6 @@ static inline unsigned bio_segments(struct bio *bio) * We special case discard/write same/write zeroes, because they * interpret bi_size differently: */ - switch (bio_op(bio)) { case REQ_OP_DISCARD: case REQ_OP_SECURE_ERASE: @@ -205,13 +204,34 @@ static inline unsigned bio_segments(struct bio *bio) case REQ_OP_WRITE_SAME: return 1; default: - break; + bio_for_each_segment(bv, bio, iter) + segs++; + return segs; } +} - bio_for_each_segment(bv, bio, iter) - segs++; +static inline unsigned bio_bvecs(struct bio *bio) +{ + unsigned bvecs = 0; + struct bio_vec bv; + struct bvec_iter iter; - return segs; + /* + * We special case discard/write same/write zeroes, because they + * interpret bi_size differently: + */ + switch (bio_op(bio)) { + case REQ_OP_DISCARD: + case REQ_OP_SECURE_ERASE: + case REQ_OP_WRITE_ZEROES: + return 0; + case REQ_OP_WRITE_SAME: + return 1; + default: + bio_for_each_bvec(bv, bio, iter) + bvecs++; + return bvecs; + } } /* -- 2.9.5