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Commit 96b418c9 authored by Jens Axboe's avatar Jens Axboe
Browse files

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: default avatarJens Axboe <jens.axboe@oracle.com>
parent ab83407e

include/linux/scatterlist.h

+9 −0
Original line number Diff line number Diff line
@@ -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 */