From: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
initialization of kvec-backed iov_iter
Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
---
include/linux/uio.h | 2 ++
mm/iov_iter.c | 13 +++++++++++++
2 files changed, 15 insertions(+)
diff --git a/include/linux/uio.h b/include/linux/uio.h
index 28ed2d9..c567655 100644
--- a/include/linux/uio.h
+++ b/include/linux/uio.h
@@ -87,6 +87,8 @@ size_t iov_iter_zero(size_t bytes, struct iov_iter *);
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);
+void iov_iter_kvec(struct iov_iter *i, int direction, const struct kvec *iov,
+ unsigned long nr_segs, size_t count);
ssize_t iov_iter_get_pages(struct iov_iter *i, struct page **pages,
size_t maxsize, unsigned maxpages, size_t *start);
ssize_t iov_iter_get_pages_alloc(struct iov_iter *i, struct page ***pages,
diff --git a/mm/iov_iter.c b/mm/iov_iter.c
index 5a3b4a8..7c04051 100644
--- a/mm/iov_iter.c
+++ b/mm/iov_iter.c
@@ -479,6 +479,19 @@ size_t iov_iter_single_seg_count(const struct iov_iter *i)
}
EXPORT_SYMBOL(iov_iter_single_seg_count);
+void iov_iter_kvec(struct iov_iter *i, int direction,
+ const struct kvec *iov, unsigned long nr_segs,
+ size_t count)
+{
+ BUG_ON(!(direction & ITER_KVEC));
+ i->type = direction;
+ i->kvec = (struct kvec *)iov;
+ i->nr_segs = nr_segs;
+ i->iov_offset = 0;
+ i->count = count;
+}
+EXPORT_SYMBOL(iov_iter_kvec);
+
unsigned long iov_iter_alignment(const struct iov_iter *i)
{
unsigned long res = 0;
--
2.1.3
--
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