From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f193.google.com ([209.85.192.193]:33312 "EHLO mail-pf0-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S943136AbcJ2IPW (ORCPT ); Sat, 29 Oct 2016 04:15:22 -0400 From: Ming Lei To: Jens Axboe , linux-kernel@vger.kernel.org Cc: linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, Christoph Hellwig , "Kirill A . Shutemov" , Ming Lei , Johannes Berg Subject: [PATCH 44/60] block: introduce bvec_for_each_sp_bvec() Date: Sat, 29 Oct 2016 16:08:43 +0800 Message-Id: <1477728600-12938-45-git-send-email-tom.leiming@gmail.com> In-Reply-To: <1477728600-12938-1-git-send-email-tom.leiming@gmail.com> References: <1477728600-12938-1-git-send-email-tom.leiming@gmail.com> Sender: linux-block-owner@vger.kernel.org List-Id: linux-block@vger.kernel.org This helper can be used to iterate each singlepage bvec from one multipage bvec. Signed-off-by: Ming Lei --- include/linux/bvec.h | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/include/linux/bvec.h b/include/linux/bvec.h index e12ce6bd63d7..510d1d2d79f1 100644 --- a/include/linux/bvec.h +++ b/include/linux/bvec.h @@ -191,4 +191,14 @@ static inline void bvec_iter_advance_mp(const struct bio_vec *bv, .bi_bvec_done = 0, \ } +#define __bvec_for_each_sp_bvec(sp_bvl, mp_bvec, iter, start) \ + for (iter = start, \ + (iter).bi_size = (mp_bvec)->bv_len; \ + (iter).bi_size && \ + ((sp_bvl = bvec_iter_bvec((mp_bvec), (iter))), 1); \ + bvec_iter_advance((mp_bvec), &(iter), (sp_bvl).bv_len)) + +#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) + #endif /* __LINUX_BVEC_ITER_H */ -- 2.7.4