Btrfs: make aux field of ulist 64 bit

Btrfs send/receive uses the aux field to store inode numbers. On
32 bit machines this may become a problem.

Also fix all users of ulist_add and ulist_add_merged.

Reported-by: Arne Jansen <sensille@gmx.net>
Signed-off-by: Alexander Block <ablock84@googlemail.com>
diff --git a/fs/btrfs/ulist.c b/fs/btrfs/ulist.c
index ab942f4..99be4c1 100644
--- a/fs/btrfs/ulist.c
+++ b/fs/btrfs/ulist.c
@@ -143,14 +143,13 @@
  * In case of allocation failure -ENOMEM is returned and the ulist stays
  * unaltered.
  */
-int ulist_add(struct ulist *ulist, u64 val, unsigned long aux,
-	      gfp_t gfp_mask)
+int ulist_add(struct ulist *ulist, u64 val, u64 aux, gfp_t gfp_mask)
 {
 	return ulist_add_merge(ulist, val, aux, NULL, gfp_mask);
 }
 
-int ulist_add_merge(struct ulist *ulist, u64 val, unsigned long aux,
-		    unsigned long *old_aux, gfp_t gfp_mask)
+int ulist_add_merge(struct ulist *ulist, u64 val, u64 aux,
+		    u64 *old_aux, gfp_t gfp_mask)
 {
 	int i;