From patchwork Mon Jun 26 12:10:13 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ming Lei X-Patchwork-Id: 9809295 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 3628660209 for ; Mon, 26 Jun 2017 12:18:21 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3E2F728583 for ; Mon, 26 Jun 2017 12:18:21 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 3196628585; Mon, 26 Jun 2017 12:18:21 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 292862858B for ; Mon, 26 Jun 2017 12:18:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752791AbdFZMSH (ORCPT ); Mon, 26 Jun 2017 08:18:07 -0400 Received: from mx1.redhat.com ([209.132.183.28]:36304 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751806AbdFZMR6 (ORCPT ); Mon, 26 Jun 2017 08:17:58 -0400 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id E9DE680C0A; Mon, 26 Jun 2017 12:17:57 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com E9DE680C0A Authentication-Results: ext-mx02.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx02.extmail.prod.ext.phx2.redhat.com; spf=pass smtp.mailfrom=ming.lei@redhat.com DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.redhat.com E9DE680C0A Received: from localhost (ovpn-12-86.pek2.redhat.com [10.72.12.86]) by smtp.corp.redhat.com (Postfix) with ESMTP id 3B99D78913; Mon, 26 Jun 2017 12:17:48 +0000 (UTC) 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 30/51] block: introduce bvec_get_last_page() Date: Mon, 26 Jun 2017 20:10:13 +0800 Message-Id: <20170626121034.3051-31-ming.lei@redhat.com> In-Reply-To: <20170626121034.3051-1-ming.lei@redhat.com> References: <20170626121034.3051-1-ming.lei@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.26]); Mon, 26 Jun 2017 12:17:58 +0000 (UTC) Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP BTRFS and guard_bio_eod() need to get the last page, so introduce this helper to make them happy. Signed-off-by: Ming Lei --- include/linux/bvec.h | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/include/linux/bvec.h b/include/linux/bvec.h index 7addceea9828..6673e3c0b7eb 100644 --- a/include/linux/bvec.h +++ b/include/linux/bvec.h @@ -206,4 +206,18 @@ static inline void bvec_iter_advance_mp(const struct bio_vec *bv, #define bvec_for_each_sp_bvec(sp_bvl, mp_bvec, iter) \ __bvec_for_each_sp_bvec(sp_bvl, mp_bvec, iter, BVEC_ITER_ALL_INIT) +/* + * get the last page from the multipage bvec and store it + * in @sp_bv + */ +static inline void bvec_get_last_page(struct bio_vec *mp_bv, + struct bio_vec *sp_bv) +{ + struct bvec_iter iter; + + *sp_bv = *mp_bv; + bvec_for_each_sp_bvec(*sp_bv, mp_bv, iter) + ; +} + #endif /* __LINUX_BVEC_ITER_H */