path: root/include/linux/uio.h
diff options
authorAl Viro <viro@zeniv.linux.org.uk>2014-02-03 17:07:03 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2014-04-01 23:19:21 -0400
commit6e58e79db8a16222b31fc8da1ca2ac2dccfc4237 (patch)
tree3babba99823f4f723a119a7ed61372baed4786bc /include/linux/uio.h
parent9223687863ffa63fa655f52ef64148ee08dee4d1 (diff)
introduce copy_page_to_iter, kill loop over iovec in generic_file_aio_read()
generic_file_aio_read() was looping over the target iovec, with loop over (source) pages nested inside that. Just set an iov_iter up and pass *that* to do_generic_file_aio_read(). With copy_page_to_iter() doing all work of mapping and copying a page to iovec and advancing iov_iter. Switch shmem_file_aio_read() to the same and kill file_read_actor(), while we are at it. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'include/linux/uio.h')
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/uio.h b/include/linux/uio.h
index 347d70ce098e..199bcc34241b 100644
--- a/include/linux/uio.h
+++ b/include/linux/uio.h
@@ -67,6 +67,8 @@ size_t iov_iter_copy_from_user(struct page *page,
void iov_iter_advance(struct iov_iter *i, size_t bytes);
int iov_iter_fault_in_readable(struct iov_iter *i, size_t bytes);
size_t iov_iter_single_seg_count(const struct iov_iter *i);
+size_t copy_page_to_iter(struct page *page, size_t offset, size_t bytes,
+ struct iov_iter *i);
static inline void iov_iter_init(struct iov_iter *i,
const struct iovec *iov, unsigned long nr_segs,