iov_iter: Add copy_folio_to_iter()

This wrapper around copy_page_to_iter() works because copy_page_to_iter() handles compound pages correctly.

Matthew Wilcox (Oracle) committed 5 years ago

Commit d9c19d31 parent 10331791 file · +7 −0Browse files

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 #include <linux/kernel.h>
 #include <linux/thread_info.h>
+#include <linux/mm_types.h>
 #include <uapi/linux/uio.h>
 struct page;
 size_t _copy_from_iter(void *addr, size_t bytes, struct iov_iter *i);
 size_t _copy_from_iter_nocache(void *addr, size_t bytes, struct iov_iter *i);
+static inline size_t copy_folio_to_iter(struct folio *folio, size_t offset,
+		size_t bytes, struct iov_iter *i)
+{
+	return copy_page_to_iter(&folio->page, offset, bytes, i);
+}
 static __always_inline __must_check
 size_t copy_to_iter(const void *addr, size_t bytes, struct iov_iter *i)
 {

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