path: root/include/linux/uio.h
diff options
authorAl Viro <viro@zeniv.linux.org.uk>2014-03-15 04:05:57 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2014-05-06 17:32:50 -0400
commit7b2c99d15559e285384c742db52316802e24b0bd (patch)
tree0f5260039ca25431decd1affc281aea5a5da27da /include/linux/uio.h
parent3320c60b3a26d05666285c55ab08ee043c017ba3 (diff)
new helper: iov_iter_get_pages()
iov_iter_get_pages(iter, pages, maxsize, &start) grabs references pinning the pages of up to maxsize of (contiguous) data from iter. Returns the amount of memory grabbed or -error. In case of success, the requested area begins at offset start in pages[0] and runs through pages[1], etc. Less than requested amount might be returned - either because the contiguous area in the beginning of iterator is smaller than requested, or because the kernel failed to pin that many pages. direct-io.c switched to using iov_iter_get_pages() 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 b80bbe197d13..341986116d83 100644
--- a/include/linux/uio.h
+++ b/include/linux/uio.h
@@ -71,6 +71,8 @@ size_t copy_page_to_iter(struct page *page, size_t offset, size_t bytes,
unsigned long iov_iter_alignment(const struct iov_iter *i);
void iov_iter_init(struct iov_iter *i, int direction, const struct iovec *iov,
unsigned long nr_segs, size_t count);
+ssize_t iov_iter_get_pages(struct iov_iter *i, struct page **pages,
+ size_t maxsize, size_t *start);
static inline size_t iov_iter_count(struct iov_iter *i)