copy_from_iter_nocache()
BTW, do we want memcpy_nocache()? Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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@ -83,6 +83,7 @@ size_t copy_page_from_iter(struct page *page, size_t offset, size_t bytes,
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struct iov_iter *i);
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struct iov_iter *i);
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size_t copy_to_iter(void *addr, size_t bytes, struct iov_iter *i);
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size_t copy_to_iter(void *addr, size_t bytes, struct iov_iter *i);
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size_t copy_from_iter(void *addr, size_t bytes, struct iov_iter *i);
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size_t copy_from_iter(void *addr, size_t bytes, struct iov_iter *i);
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size_t copy_from_iter_nocache(void *addr, size_t bytes, struct iov_iter *i);
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size_t iov_iter_zero(size_t bytes, struct iov_iter *);
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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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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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void iov_iter_init(struct iov_iter *i, int direction, const struct iovec *iov,
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@ -399,6 +399,27 @@ size_t copy_from_iter(void *addr, size_t bytes, struct iov_iter *i)
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}
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}
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EXPORT_SYMBOL(copy_from_iter);
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EXPORT_SYMBOL(copy_from_iter);
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size_t copy_from_iter_nocache(void *addr, size_t bytes, struct iov_iter *i)
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{
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char *to = addr;
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if (unlikely(bytes > i->count))
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bytes = i->count;
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if (unlikely(!bytes))
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return 0;
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iterate_and_advance(i, bytes, v,
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__copy_from_user_nocache((to += v.iov_len) - v.iov_len,
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v.iov_base, v.iov_len),
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memcpy_from_page((to += v.bv_len) - v.bv_len, v.bv_page,
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v.bv_offset, v.bv_len),
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memcpy((to += v.iov_len) - v.iov_len, v.iov_base, v.iov_len)
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)
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return bytes;
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}
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EXPORT_SYMBOL(copy_from_iter_nocache);
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size_t copy_page_to_iter(struct page *page, size_t offset, size_t bytes,
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size_t copy_page_to_iter(struct page *page, size_t offset, size_t bytes,
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struct iov_iter *i)
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struct iov_iter *i)
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{
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{
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