dump: use fd_params->type for cwd and exe magic

This is a cleanup patch. Use file entry type variable for special files
instead of file entry addr variable.
Signed-off-by: Stanislav Kinsbursky <skinsbursky@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

cr-dump.c

@@ -164,10 +164,9 @@ static int dump_task_special_files(pid_t pid, struct cr_fdset *cr_fdset)
 
 	/* Dump /proc/pid/cwd */
 	params = (struct fd_parms) {
-		.fd_name	= FDINFO_CWD,
 		.id		= FD_ID_INVALID,
 		.pid		= FD_PID_INVALID,
-		.type		= FDINFO_FD,
+		.type		= FDINFO_CWD,
 	};
 
 	fd = open_proc(pid, "cwd");
@@ -179,10 +178,9 @@ static int dump_task_special_files(pid_t pid, struct cr_fdset *cr_fdset)
 
 	/* Dump /proc/pid/exe */
 	params = (struct fd_parms) {
-		.fd_name	= FDINFO_EXE,
 		.id		= FD_ID_INVALID,
 		.pid		= FD_PID_INVALID,
-		.type		= FDINFO_FD,
+		.type		= FDINFO_EXE,
 	};
 
 	fd = open_proc(pid, "exe");
@@ -358,7 +356,7 @@ static int dump_one_fd(pid_t pid, int pid_fd_dir, char *d_name, struct cr_fdset
 	    (S_ISCHR(fd_stat.st_mode) && major(fd_stat.st_rdev) == MEM_MAJOR)) {
 
 		p.id = MAKE_FD_GENID(fd_stat.st_dev, fd_stat.st_ino, p.pos);
-		p.type = FDINFO_FD;
+		p.type = FDINFO_REG;
 
 		return dump_one_reg_file(&p, lfd, cr_fdset, 1);
 	}

files.c

@@ -403,7 +403,7 @@ static int open_fdinfo(int pid, struct fdinfo_entry *fe, int *fdinfo_fd, int sta
 	pr_info("\t%d: Got fd for %lx type %d namelen %d users %d\n", pid,
 			(unsigned long)fe->addr, fe->type, fe->len, fi->users);
 
-	BUG_ON(fe->type != FDINFO_FD);
+	BUG_ON(fe->type != FDINFO_REG);
 
 
 	switch (state) {
@@ -431,11 +431,12 @@ static int open_special_fdinfo(int pid, struct fdinfo_entry *fe,
 
 	if (fe->type == FDINFO_MAP)
 		return open_fmap(pid, fe, fdinfo_fd);
-	if (fe->addr == FDINFO_CWD)
+	if (fe->type == FDINFO_CWD)
 		return restore_cwd(fe, fdinfo_fd);
-	if (fe->addr == FDINFO_EXE)
+	if (fe->type == FDINFO_EXE)
 		return restore_exe_early(fe, fdinfo_fd);
 
+	pr_info("%d: fe->type: %d\n", pid,  fe->type);
 	BUG_ON(1);
 	return -1;
 }

include/image.h

@@ -29,12 +29,12 @@
 
 #define PIPEFS_MAGIC	0x50495045
 
-#define FDINFO_FD	1
+#define FDINFO_REG	1
 #define FDINFO_MAP	2
 
 /* Specials */
-#define FDINFO_CWD	(-1ULL)
-#define FDINFO_EXE	(-2ULL)
+#define FDINFO_CWD	3
+#define FDINFO_EXE	4
 
 #define PAGE_IMAGE_SIZE	4096
 #define PAGE_RSS	1
@@ -51,9 +51,9 @@ struct fdinfo_entry {
 } __packed;
 
 #define fd_is_special(fe)		\
-	(((fe)->type != FDINFO_FD)  ||	\
-	 ((fe)->addr == FDINFO_CWD) ||	\
-	 ((fe)->addr == FDINFO_EXE))
+	(((fe)->type == FDINFO_MAP) ||	\
+	 ((fe)->type == FDINFO_CWD) ||	\
+	 ((fe)->type == FDINFO_EXE))
 
 struct shmem_entry {
 	u64	start;

restorer.c

@@ -248,7 +248,7 @@ static long restore_self_exe_late(struct task_restore_core_args *args)
 			goto err;
 		}
 
-		if (fe.type == FDINFO_FD && fe.addr == FDINFO_EXE)
+		if (fe.type == FDINFO_EXE)
 			break;
 
 		if (fe.len)