96b418c960
First step to being able to change the scatterlist setup without having to modify drivers (a lot :-) Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
32 lines
810 B
C
32 lines
810 B
C
#ifndef _LINUX_SCATTERLIST_H
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#define _LINUX_SCATTERLIST_H
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#include <asm/scatterlist.h>
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#include <linux/mm.h>
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#include <linux/string.h>
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static inline void sg_set_buf(struct scatterlist *sg, const void *buf,
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unsigned int buflen)
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{
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sg->page = virt_to_page(buf);
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sg->offset = offset_in_page(buf);
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sg->length = buflen;
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}
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static inline void sg_init_one(struct scatterlist *sg, const void *buf,
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unsigned int buflen)
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{
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memset(sg, 0, sizeof(*sg));
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sg_set_buf(sg, buf, buflen);
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}
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#define sg_next(sg) ((sg) + 1)
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#define sg_last(sg, nents) (&(sg[(nents) - 1]))
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/*
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* Loop over each sg element, following the pointer to a new list if necessary
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*/
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#define for_each_sg(sglist, sg, nr, __i) \
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for (__i = 0, sg = (sglist); __i < (nr); __i++, sg = sg_next(sg))
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#endif /* _LINUX_SCATTERLIST_H */
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