This wrapper around copy_page_to_iter() works because copy_page_to_iter()
handles compound pages correctly.
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
---
include/linux/uio.h | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/include/linux/uio.h b/include/linux/uio.h
index 6350354f97e9..8479cf46b5b1 100644
--- a/include/linux/uio.h
+++ b/include/linux/uio.h
@@ -10,6 +10,7 @@
#include <uapi/linux/uio.h>
struct page;
+struct folio;
struct pipe_inode_info;
struct kvec {
@@ -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((struct page *)folio, offset, bytes, i);
+}
+
static __always_inline __must_check
size_t copy_to_iter(const void *addr, size_t bytes, struct iov_iter *i)
{
--
2.33.0
