service: Put service sk inode into separate variable

I'm about to get rid of service state struct.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

cr-service.c

@@ -19,6 +19,7 @@
 #include "cr-service.h"
 
 struct _cr_service_client *cr_service_client;
+unsigned int service_sk_ino = 0;
 
 static int recv_criu_msg(int socket_fd, CriuReq **msg)
 {
@@ -94,7 +95,8 @@ static int setup_dump_from_req(int sk, CriuDumpReq *req)
 		return -1;
 	}
 
-	cr_service_client->sk_ino = st.st_ino;
+	BUG_ON(st.st_ino == 0);
+	service_sk_ino = st.st_ino;
 
 	/* going to dir, where to place images*/
 	sprintf(images_dir_path, "/proc/%d/fd/%d", ids.pid, req->images_dir_fd);

include/cr-service.h

@@ -11,10 +11,10 @@ int cr_service(bool deamon_mode);
 int send_criu_dump_resp(int socket_fd, bool success, bool restored);
 
 struct _cr_service_client {
-	int sk_ino;
 	int uid;
 };
 
 extern struct _cr_service_client *cr_service_client;
+extern unsigned int service_sk_ino;
 
 #endif

sk-unix.c

@@ -88,11 +88,6 @@ static void show_one_unix_img(const char *act, const UnixSkEntry *e)
 		act, e->id, e->ino, e->peer, e->type, e->state, (int)e->name.len);
 }
 
-static bool service_socket(unsigned int sk_ino)
-{
-	return cr_service_client && (cr_service_client->sk_ino == sk_ino);
-}
-
 static int can_dump_unix_sk(const struct unix_sk_desc *sk)
 {
 	/*
@@ -156,7 +151,7 @@ static int dump_one_unix_fd(int lfd, u32 id, const struct fd_parms *p)
 	 * Check if this socket is connected to criu service.
 	 * Dump it like closed one and mark it for restore.
 	 */
-	if (service_socket(ue.peer)) {
+	if (unlikely(ue.peer == service_sk_ino)) {
 		ue.state = TCP_CLOSE;
 		ue.peer = 0;
 		ue.uflags |= USK_SERVICE;