new helper: iov_iter_kvec()
initialization of kvec-backed iov_iter Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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@ -87,6 +87,8 @@ size_t iov_iter_zero(size_t bytes, struct iov_iter *);
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unsigned long iov_iter_alignment(const struct iov_iter *i);
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void iov_iter_init(struct iov_iter *i, int direction, const struct iovec *iov,
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unsigned long nr_segs, size_t count);
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void iov_iter_kvec(struct iov_iter *i, int direction, const struct kvec *iov,
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unsigned long nr_segs, size_t count);
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ssize_t iov_iter_get_pages(struct iov_iter *i, struct page **pages,
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size_t maxsize, unsigned maxpages, size_t *start);
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ssize_t iov_iter_get_pages_alloc(struct iov_iter *i, struct page ***pages,
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@ -479,6 +479,19 @@ size_t iov_iter_single_seg_count(const struct iov_iter *i)
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}
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EXPORT_SYMBOL(iov_iter_single_seg_count);
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void iov_iter_kvec(struct iov_iter *i, int direction,
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const struct kvec *iov, unsigned long nr_segs,
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size_t count)
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{
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BUG_ON(!(direction & ITER_KVEC));
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i->type = direction;
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i->kvec = (struct kvec *)iov;
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i->nr_segs = nr_segs;
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i->iov_offset = 0;
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i->count = count;
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}
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EXPORT_SYMBOL(iov_iter_kvec);
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unsigned long iov_iter_alignment(const struct iov_iter *i)
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{
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unsigned long res = 0;
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