From 27c0e3748e41ca79171ffa3e97415a20af6facd0 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Fri, 17 Feb 2017 18:42:24 -0500 Subject: [iov_iter] new privimitive: iov_iter_revert() opposite to iov_iter_advance(); the caller is responsible for never using it to move back past the initial position. Cc: stable@vger.kernel.org Signed-off-by: Al Viro --- include/linux/uio.h | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'include') diff --git a/include/linux/uio.h b/include/linux/uio.h index 804e34c6f981..f2d36a3d3005 100644 --- a/include/linux/uio.h +++ b/include/linux/uio.h @@ -39,7 +39,10 @@ struct iov_iter { }; union { unsigned long nr_segs; - int idx; + struct { + int idx; + int start_idx; + }; }; }; @@ -81,6 +84,7 @@ unsigned long iov_shorten(struct iovec *iov, unsigned long nr_segs, size_t to); size_t iov_iter_copy_from_user_atomic(struct page *page, struct iov_iter *i, unsigned long offset, size_t bytes); void iov_iter_advance(struct iov_iter *i, size_t bytes); +void iov_iter_revert(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, -- cgit