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Message-Id: <11793043001618-git-send-email-jens.axboe@oracle.com> Date: Wed, 16 May 2007 10:31:32 +0200 From: Jens Axboe <jens.axboe@...cle.com> To: linux-kernel@...r.kernel.org Cc: Jens Axboe <jens.axboe@...cle.com> Subject: [PATCH 2/10] Add sg helpers for iterating over a scatterlist table First step to being able to change the scatterlist setup without having to modify drivers (a lot :-) Signed-off-by: Jens Axboe <jens.axboe@...cle.com> --- 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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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