From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755251AbXEIIAT (ORCPT ); Wed, 9 May 2007 04:00:19 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753863AbXEIH7q (ORCPT ); Wed, 9 May 2007 03:59:46 -0400 Received: from brick.kernel.dk ([80.160.20.94]:20889 "EHLO kernel.dk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751672AbXEIH7o (ORCPT ); Wed, 9 May 2007 03:59:44 -0400 From: Jens Axboe To: linux-kernel@vger.kernel.org Cc: Jens Axboe Subject: [PATCH 2/10] Add sg helpers for iterating over a scatterlist table Date: Wed, 9 May 2007 09:59:16 +0200 Message-Id: <11786975641306-git-send-email-jens.axboe@oracle.com> X-Mailer: git-send-email 1.5.2.rc1 In-Reply-To: <11786975641643-git-send-email-jens.axboe@oracle.com> References: <11786975641643-git-send-email-jens.axboe@oracle.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org First step to being able to change the scatterlist setup without having to modify drivers (a lot :-) Signed-off-by: Jens Axboe --- include/linux/scatterlist.h | 9 +++++++++ 1 files changed, 9 insertions(+), 0 deletions(-) diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h index 4efbd9c..c5bffde 100644 --- a/include/linux/scatterlist.h +++ b/include/linux/scatterlist.h @@ -20,4 +20,13 @@ static inline void sg_init_one(struct scatterlist *sg, const void *buf, sg_set_buf(sg, buf, buflen); } +#define sg_next(sg) ((sg) + 1) +#define sg_last(sg, nents) (&(sg[nents - 1])) + +/* + * Loop over each sg element, following the pointer to a new list if necessary + */ +#define for_each_sg(sglist, sg, nr, __i) \ + for (__i = 0, sg = (sglist); __i < nr; __i++, sg = sg_next(sg)) + #endif /* _LINUX_SCATTERLIST_H */ -- 1.5.2.rc1