[PATCH 06/48] iov_iter: Add copy_folio_to_iter()
From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Date: 2021-12-08 04:23:14
Also in:
linux-fsdevel
Subsystem:
the rest, userspace copyin/copyout (uiovec) · Maintainers:
Linus Torvalds, Alexander Viro
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> --- 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