locks: typedef fl_owner_t to void *

fl_owner_t is a cookie that can store all kinds of different pointers,
so don't pretends it points to a file structure.

For now just change the typedef, but as a follow on this will allow
to get rids of lots of casts and eventually the typedef itself.

Signed-off-by: Christoph Hellwig <[email protected]>
Signed-off-by: Jeff Layton <[email protected]>
Change-Id: I197cdfff4c84aa8fcb7a2f1c7952b54e8f679f8e

Author: Christoph Hellwig

include/linux/fs.h

@@ -939,7 +939,7 @@ static inline int file_check_writeable(struct file *filp)
  *
  * Lockd stuffs a "host" pointer into this.
  */
-typedef struct files_struct *fl_owner_t;
+typedef void *fl_owner_t;
 
 struct file_lock_operations {
 	void (*fl_copy_lock)(struct file_lock *, struct file_lock *);