files: Add task link to created fdinfo_list_entry and populate it

This will be used in further to determine whether task's namespace
allows to restore file_desc.
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

criu/files.c

@@ -704,6 +704,12 @@ static struct fdinfo_list_entry *alloc_fle(int pid, FdinfoEntry *fe)
 	fle->received = 0;
 	fle->fake = 0;
 	fle->stage = FLE_INITIALIZED;
+	fle->task = pstree_item_by_virt(pid);
+	if (!fle->task) {
+		pr_err("Can't find task with pid %d\n", pid);
+		shfree_last(fle);
+		return NULL;
+	}
 
 	return fle;
 }

criu/include/files.h

@@ -83,6 +83,7 @@ struct fdinfo_list_entry {
 	struct list_head	desc_list;	/* To chain on  @fd_info_head */
 	struct file_desc	*desc;		/* Associated file descriptor */
 	struct list_head	ps_list;	/* To chain  per-task files */
+	struct pstree_item	*task;
 	FdinfoEntry		*fe;
 	int			pid;
 	u8			received:1;