From bd8e0ff956456ad9071dbb6c2ed7d33bd22fc216 Mon Sep 17 00:00:00 2001 From: Omar Sandoval Date: Tue, 17 Mar 2015 14:04:02 -0700 Subject: new helper: iov_iter_rw() Get either READ or WRITE out of iter->type. Signed-off-by: Omar Sandoval Signed-off-by: Al Viro --- include/linux/uio.h | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/include/linux/uio.h b/include/linux/uio.h index 15f11fb9fff6..8b01e1c3c614 100644 --- a/include/linux/uio.h +++ b/include/linux/uio.h @@ -111,6 +111,14 @@ static inline bool iter_is_iovec(struct iov_iter *i) return !(i->type & (ITER_BVEC | ITER_KVEC)); } +/* + * Get one of READ or WRITE out of iter->type without any other flags OR'd in + * with it. + * + * The ?: is just for type safety. + */ +#define iov_iter_rw(i) ((0 ? (struct iov_iter *)0 : (i))->type & RW_MASK) + /* * Cap the iov_iter by given limit; note that the second argument is * *not* the new size - it's upper limit for such. Passing it a value -- cgit v1.2.3