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new helper: iov_iter_rw()

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

Signed-off-by: Omar Sandoval <osandov@osandov.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Omar Sandoval 2015-03-17 14:04:02 -07:00 committed by Al Viro
parent 8436318205
commit bd8e0ff956
1 changed files with 8 additions and 0 deletions
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8
include/linux/uio.h
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@ -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