dump: Pass whole struct pid into thread dumping routine

And do "get real pid, report virtual one" inside.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

cr-dump.c

@@ -1176,8 +1176,8 @@ static int dump_task_thread(struct parasite_ctl *parasite_ctl, struct pid *tid)
 	if (ret)
 		goto err_free;
 
-	ret = parasite_dump_thread_seized(parasite_ctl, pid, &taddr,
-					  &tid->virt, &core->thread_core->blk_sigset,
+	ret = parasite_dump_thread_seized(parasite_ctl, tid, &taddr,
+					  &core->thread_core->blk_sigset,
 					  &tls);
 
 	if (ret) {

include/parasite-syscall.h

@@ -36,8 +36,9 @@ extern int parasite_dump_pages_seized(struct parasite_ctl *ctl,
 				      struct list_head *vma_area_list,
 				      struct cr_fdset *cr_fdset);
 struct parasite_dump_thread;
-extern int parasite_dump_thread_seized(struct parasite_ctl *ctl, pid_t pid,
-					unsigned int **tid_add, pid_t *tid,
+struct pid;
+extern int parasite_dump_thread_seized(struct parasite_ctl *ctl, struct pid *tid,
+					unsigned int **tid_add,
 					void *blocked, u32 *tls);
 
 struct parasite_drain_fd;

parasite-syscall.c

@@ -364,8 +364,8 @@ err:
 	return -1;
 }
 
-int parasite_dump_thread_seized(struct parasite_ctl *ctl, pid_t pid,
-					unsigned int **tid_addr, pid_t *tid,
+int parasite_dump_thread_seized(struct parasite_ctl *ctl, struct pid *tid,
+					unsigned int **tid_addr,
 					void *blocked,
 					u32 *tls)
 {
@@ -374,11 +374,11 @@ int parasite_dump_thread_seized(struct parasite_ctl *ctl, pid_t pid,
 
 	args = parasite_args(ctl, struct parasite_dump_thread);
 
-	ret = parasite_execute_by_pid(PARASITE_CMD_DUMP_THREAD, ctl, pid);
+	ret = parasite_execute_by_pid(PARASITE_CMD_DUMP_THREAD, ctl, tid->real);
 
 	memcpy(blocked, &args->blocked, sizeof(args->blocked));
 	*tid_addr = args->tid_addr;
-	*tid = args->tid;
+	tid->virt = args->tid;
 	*tls = args->tls;
 
 	return ret;