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iov_iter: Add copy_folio_to_iter()

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

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: William Kucharski <william.kucharski@oracle.com>
This commit is contained in:
Matthew Wilcox (Oracle) 2021-10-18 10:39:06 -04:00
parent 10331795fb
commit d9c19d32d8
1 changed files with 7 additions and 0 deletions
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7
include/linux/uio.h
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@ -7,6 +7,7 @@
#include <linux/kernel.h>
#include <linux/thread_info.h>
#include <linux/mm_types.h>
#include <uapi/linux/uio.h>
struct page;
@ -146,6 +147,12 @@ size_t _copy_to_iter(const void *addr, size_t bytes, struct iov_iter *i);
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)
{