From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qk0-f200.google.com (mail-qk0-f200.google.com [209.85.220.200]) by kanga.kvack.org (Postfix) with ESMTP id E0DED6B04AC for ; Tue, 8 Aug 2017 04:51:40 -0400 (EDT) Received: by mail-qk0-f200.google.com with SMTP id o5so12898643qki.2 for ; Tue, 08 Aug 2017 01:51:40 -0700 (PDT) Received: from mx1.redhat.com (mx1.redhat.com. [209.132.183.28]) by mx.google.com with ESMTPS id l10si750703qtc.525.2017.08.08.01.51.40 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 08 Aug 2017 01:51:40 -0700 (PDT) From: Ming Lei Subject: [PATCH v3 28/49] block: introduce bvec_get_last_page() Date: Tue, 8 Aug 2017 16:45:27 +0800 Message-Id: <20170808084548.18963-29-ming.lei@redhat.com> In-Reply-To: <20170808084548.18963-1-ming.lei@redhat.com> References: <20170808084548.18963-1-ming.lei@redhat.com> Sender: owner-linux-mm@kvack.org List-ID: 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 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 23d3abdf057c..ceb6292750d6 100644 --- a/include/linux/bvec.h +++ b/include/linux/bvec.h @@ -238,4 +238,18 @@ static inline bool 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 */ -- 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