[RFC PATCH v3 1/5] new helper: iov_iter_rw()

[Omar Sandoval]

Get either READ or WRITE out of iter->type.

Signed-off-by: Omar Sandoval <osandov@xxxxxxxxxxx>
---
Ok, let's do that, then.

 include/linux/uio.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/linux/uio.h b/include/linux/uio.h
index 7188029..71889c9 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)
 }
 
 /*
+ * 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
  * greater than the amount of data in iov_iter is fine - it'll just do
-- 
2.3.3

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