Re: [PATCH v5 4/5] fs, xfs: introduce MAP_DIRECT for creating block-map-atomic file ranges

[Kirill A. Shutemov]

On Wed, Aug 16, 2017 at 12:44:28AM -0700, Dan Williams wrote:
> @@ -1411,6 +1422,9 @@ unsigned long do_mmap(struct file *file, unsigned long 
> addr,
>  
>                       /* fall through */
>               case MAP_PRIVATE:
> +                     if ((flags & (MAP_PRIVATE|MAP_DIRECT))
> +                                     == (MAP_PRIVATE|MAP_DIRECT))
> +                             return -EINVAL;

We've already checked for MAP_PRIVATE in this codepath. Simple (flags &
MAP_DIRECT) would be enough.

-- 
 Kirill A. Shutemov