[deliverable/linux.git] / include / linux / scatterlist.h

#ifndef _LINUX_SCATTERLIST_H
#define _LINUX_SCATTERLIST_H

#include <asm/scatterlist.h>
#include <linux/mm.h>
#include <linux/string.h>

static inline void sg_set_buf(struct scatterlist *sg, const void *buf,
			      unsigned int buflen)
{
	sg->page = virt_to_page(buf);
	sg->offset = offset_in_page(buf);
	sg->length = buflen;
}

static inline void sg_init_one(struct scatterlist *sg, const void *buf,
			       unsigned int buflen)
{
	memset(sg, 0, sizeof(*sg));
	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 */
Commit	Line	Data
1da177e4 LT	1	#ifndef _LINUX_SCATTERLIST_H
	2	#define _LINUX_SCATTERLIST_H
	3
d32311fe HX	4	#include <asm/scatterlist.h>
	5	#include <linux/mm.h>
	6	#include <linux/string.h>
1da177e4	7
03fd9cee	8	static inline void sg_set_buf(struct scatterlist sg, const void buf,
d32311fe HX	9	unsigned int buflen)
d32311fe HX	10	{
1da177e4 LT	11	sg->page = virt_to_page(buf);
	12	sg->offset = offset_in_page(buf);
	13	sg->length = buflen;
	14	}
	15
03fd9cee	16	static inline void sg_init_one(struct scatterlist sg, const void buf,
d32311fe HX	17	unsigned int buflen)
	18	{
	19	memset(sg, 0, sizeof(*sg));
	20	sg_set_buf(sg, buf, buflen);
	21	}
	22
96b418c9 JA	23	#define sg_next(sg) ((sg) + 1)
	24	#define sg_last(sg, nents) (&(sg[(nents) - 1]))
	25
	26	/*
	27	* Loop over each sg element, following the pointer to a new list if necessary
	28	*/
	29	#define for_each_sg(sglist, sg, nr, __i) \
	30	for (__i = 0, sg = (sglist); __i < (nr); __i++, sg = sg_next(sg))
	31
1da177e4	32	#endif /* _LINUX_SCATTERLIST_H */