kernfs: add kernfs_open_file->priv

Add a private data field to be used by kernfs file operations.  This
generally makes sense and will be used by cgroup.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/kernfs.h b/include/linux/kernfs.h
index 47f5235a097a..9ca0f09757a1 100644
--- a/include/linux/kernfs.h
+++ b/include/linux/kernfs.h
@@ -146,6 +146,7 @@ struct kernfs_open_file {
         /* published fields */
         struct kernfs_node      *kn;
         struct file             *file;
+        void                    *priv;
 
         /* private fields, do not use outside kernfs proper */
         struct mutex            mutex;