file: Introduce prepare_files()

I'm about to merge all the file images into one big image,
so here's the place that would read it and collect.
Reviewed-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

criu/cr-restore.c

@@ -222,7 +222,7 @@ static int restore_finish_ns_stage(int from, int to)
 
 static int crtools_prepare_shared(void)
 {
-	if (prepare_shared_fdinfo())
+	if (prepare_files())
 		return -1;
 
 	/* We might want to remove ghost files on failed restore */

criu/files.c

@@ -54,14 +54,12 @@
 #define FDESC_HASH_SIZE	64
 static struct hlist_head file_desc_hash[FDESC_HASH_SIZE];
 
-int prepare_shared_fdinfo(void)
+static void init_fdesc_hash(void)
 {
 	int i;
 
 	for (i = 0; i < FDESC_HASH_SIZE; i++)
 		INIT_HLIST_HEAD(&file_desc_hash[i]);
-
-	return 0;
 }
 
 void file_desc_init(struct file_desc *d, u32 id, struct file_desc_ops *ops)
@@ -1665,3 +1663,9 @@ int open_transport_socket(void)
 
 	return 0;
 }
+
+int prepare_files(void)
+{
+	init_fdesc_hash();
+	return 0;
+}

criu/include/files.h

@@ -157,7 +157,7 @@ extern void show_saved_files(void);
 extern int prepare_fds(struct pstree_item *me);
 extern int prepare_fd_pid(struct pstree_item *me);
 extern int prepare_ctl_tty(int pid, struct rst_info *rst_info, u32 ctl_tty_id);
-extern int prepare_shared_fdinfo(void);
+extern int prepare_files(void);
 extern int restore_fs(struct pstree_item *);
 extern int prepare_fs_pid(struct pstree_item *);
 extern int set_fd_flags(int fd, int flags);