autofs: Add FD_TYPES__AUTOFS_PIPE type

Add a fake fd type for autofs. This allows functions
like find_file_desc() work as expected, without
having two different file_desc with the same type
and same id.

Also, later, it will allow to delete autofs_create_fle()
and to use generic helper.
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

criu/autofs.c

@@ -892,6 +892,7 @@ static int autofs_create_pipe(struct pstree_item *task, autofs_info_t *i,
 		return -1;
 	memcpy(ops, pi->d.ops, sizeof(*ops));
 	ops->open = autofs_open_pipefd;
+	ops->type = FD_TYPES__AUTOFS_PIPE;
 
 	pe = shmalloc(sizeof(*pe));
 	if (!pe)
@@ -910,6 +911,7 @@ static int autofs_create_pipe(struct pstree_item *task, autofs_info_t *i,
 	fe = dup_fdinfo(ple->fe, fd, flags);
 	if (!fe)
 		return -1;
+	fe->type = FD_TYPES__AUTOFS_PIPE;
 
 	pr_info("autofs: adding pipe fd %d, flags %#x to %d (with post_open)\n",
 		fe->fd, fe->flags, vpid(task));

images/fdinfo.proto

@@ -36,6 +36,9 @@ enum fd_types {
 	TUNF		= 15;
 	EXT		= 16;
 	TIMERFD		= 17;
+
+	/* Any number above the real used. Not stored to image */
+	AUTOFS_PIPE	= 65535;
 }
 
 message fdinfo_entry {