Open proc links with O_PATH

These three are like map_files one.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Acked-by: Cyrill Gorcunov <gorcunov@openvz.org>

cr-dump.c

@@ -240,7 +240,7 @@ static int dump_task_exe_link(pid_t pid, MmEntry *mm)
 	struct fd_parms params;
 	int fd, ret = 0;
 
-	fd = open_proc(pid, "exe");
+	fd = open_proc_path(pid, "exe");
 	if (fd < 0)
 		return -1;
 
@@ -263,7 +263,7 @@ static int dump_task_fs(pid_t pid, struct parasite_dump_misc *misc, struct cr_im
 	fe.has_umask = true;
 	fe.umask = misc->umask;
 
-	fd = open_proc(pid, "cwd");
+	fd = open_proc_path(pid, "cwd");
 	if (fd < 0)
 		return -1;
 
@@ -278,7 +278,7 @@ static int dump_task_fs(pid_t pid, struct parasite_dump_misc *misc, struct cr_im
 
 	close(fd);
 
-	fd = open_proc(pid, "root");
+	fd = open_proc_path(pid, "root");
 	if (fd < 0)
 		return -1;
 

include/util.h

@@ -94,6 +94,9 @@ extern int do_open_proc(pid_t pid, int flags, const char *fmt, ...);
 #define open_proc_rw(pid, fmt, ...)				\
 	__open_proc(pid, O_RDWR, fmt, ##__VA_ARGS__)
 
+#define open_proc_path(pid, fmt, ...)				\
+	__open_proc(pid, O_PATH, fmt, ##__VA_ARGS__)
+
 /* DIR *opendir_proc(pid_t pid, const char *fmt, ...); */
 #define opendir_proc(pid, fmt, ...)					\
 	({								\