xfs: introduce new private btree cursor names

Just the defines of the new names - the conversion will be in
scripted commits after this.
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
[darrick: change "bc_bt" to "bc_ino"]
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>

fs/xfs/libxfs/xfs_btree.h

@@ -224,6 +224,8 @@ typedef struct xfs_btree_cur
 #define	XFS_BTCUR_BPRV_INVALID_OWNER	(1<<1)		/* for ext swap */
 		} b;
 	}		bc_private;	/* per-btree type data */
+#define bc_ag	bc_private.a
+#define bc_ino	bc_private.b
 } xfs_btree_cur_t;
 
 /* cursor flags */