orangefs: Implement inode_operations->permission().

Thus d_revalidate is not obliged to check on as much, which will
eventually lead the way to hammering the filesystem servers much less.

Signed-off-by: Martin Brandenburg <martin@omnibond.com>
Signed-off-by: Mike Marshall <hubcap@omnibond.com>
diff --git a/fs/orangefs/orangefs-kernel.h b/fs/orangefs/orangefs-kernel.h
index d4db962..a8cde90 100644
--- a/fs/orangefs/orangefs-kernel.h
+++ b/fs/orangefs/orangefs-kernel.h
@@ -493,6 +493,8 @@
 		  struct dentry *dentry,
 		  struct kstat *kstat);
 
+int orangefs_permission(struct inode *inode, int mask);
+
 /*
  * defined in xattr.c
  */