files: Kill unused CTL_TTY_OFF leftovers

CTL_TTY_OFF and reserve_service_fd() are unused now,
so purge them from the code.
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

criu/include/servicefd.h

@@ -10,7 +10,6 @@ enum sfd_type {
 	IMG_FD_OFF,
 	PROC_FD_OFF,	/* fd with /proc for all proc_ calls */
 	PROC_PID_FD_OFF,
-	CTL_TTY_OFF,
 	SELF_STDIN_OFF,
 	CR_PROC_FD_OFF, /* some other's proc fd.
 			 *  For dump -- target ns' proc
@@ -33,7 +32,6 @@ struct pstree_item;
 extern int clone_service_fd(int id);
 extern int init_service_fd(void);
 extern int get_service_fd(enum sfd_type type);
-extern int reserve_service_fd(enum sfd_type type);
 extern int install_service_fd(enum sfd_type type, int fd);
 extern int close_service_fd(enum sfd_type type);
 extern bool is_service_fd(int fd, enum sfd_type type);

criu/util.c

@@ -474,16 +474,6 @@ int service_fd_min_fd(struct pstree_item *item)
 
 static DECLARE_BITMAP(sfd_map, SERVICE_FD_MAX);
 
-int reserve_service_fd(enum sfd_type type)
-{
-	int sfd = __get_service_fd(type, service_fd_id);
-
-	BUG_ON((int)type <= SERVICE_FD_MIN || (int)type >= SERVICE_FD_MAX);
-
-	set_bit(type, sfd_map);
-	return sfd;
-}
-
 int install_service_fd(enum sfd_type type, int fd)
 {
 	int sfd = __get_service_fd(type, service_fd_id);