files: Kill file_desc_ops::want_transport()

Since transport fd is per-task, this method is not need anymore.
Kill it.

travis-ci: success for Rework file opening scheme to make it asynchronous (rev5)
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

criu/include/files.h

@@ -102,11 +102,6 @@ struct file_desc_ops {
 	 * and with the fd being the "restored" one.
 	 */
 	int			(*post_open)(struct file_desc *d, int fd);
-	/*
-	 * Report whether the fd in question wants a transport socket
-	 * in it instead of a real file. See file_master for details.
-	 */
-	int			(*want_transport)(FdinfoEntry *fe, struct file_desc *d);
 	/*
 	 * Called to collect a new fd before adding it on desc. Clients
 	 * may chose to collect it to some specific rst_info list. See

criu/pipes.c

@@ -327,18 +327,9 @@ out:
 	return tmp;
 }
 
-static int want_transport(FdinfoEntry *fe, struct file_desc *d)
-{
-	struct pipe_info *pi;
-
-	pi = container_of(d, struct pipe_info, d);
-	return !pi->create;
-}
-
 static struct file_desc_ops pipe_desc_ops = {
 	.type		= FD_TYPES__PIPE,
 	.open		= open_pipe,
-	.want_transport	= want_transport,
 	.name		= pipe_d_name,
 };
 

criu/sk-unix.c

@@ -1034,15 +1034,6 @@ done:
 	return ret;
 }
 
-static int unixsk_should_open_transport(FdinfoEntry *fe,
-				struct file_desc *d)
-{
-	struct unix_sk_info *ui;
-
-	ui = container_of(d, struct unix_sk_info, d);
-	return ui->flags & USK_PAIR_SLAVE;
-}
-
 static int open_unixsk_pair_master(struct unix_sk_info *ui)
 {
 	int sk[2];
@@ -1293,7 +1284,6 @@ static struct file_desc_ops unix_desc_ops = {
 	.type = FD_TYPES__UNIXSK,
 	.open = open_unix_sk,
 	.post_open = post_open_unix_sk,
-	.want_transport = unixsk_should_open_transport,
 	.name = socket_d_name,
 };
 

criu/tty.c

@@ -1108,12 +1108,6 @@ static int tty_open(struct file_desc *d)
 	return info->driver->open(info);
 }
 
-static int tty_transport(FdinfoEntry *fe, struct file_desc *d)
-{
-	struct tty_info *info = container_of(d, struct tty_info, d);
-	return !info->create;
-}
-
 static void tty_collect_fd(struct file_desc *d, struct fdinfo_list_entry *fle,
 		struct rst_info *ri)
 {
@@ -1150,7 +1144,6 @@ static struct file_desc_ops tty_desc_ops = {
 	.type		= FD_TYPES__TTY,
 	.open		= tty_open,
 	.post_open	= tty_restore_ctl_terminal,
-	.want_transport = tty_transport,
 	.collect_fd	= tty_collect_fd,
 	.name		= tty_d_name,
 };