files: Count inh_fd_max

This patch counts maximum of inherited fds.
The value will be used in next patch.
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

criu/files.c

@@ -1455,6 +1455,8 @@ struct inherit_fd {
 	dev_t inh_rdev;
 };
 
+int inh_fd_max = -1;
+
 /*
  * Return 1 if inherit fd has been closed or reused, 0 otherwise.
  *
@@ -1551,6 +1553,9 @@ int inherit_fd_add(int fd, char *key)
 	if (inh == NULL)
 		return -1;
 
+	if (fd > inh_fd_max)
+		inh_fd_max = fd;
+
 	inh->inh_id = key;
 	inh->inh_fd = fd;
 	inh->inh_dev = sbuf.st_dev;

criu/include/files.h

@@ -91,6 +91,8 @@ struct fdinfo_list_entry {
 	u8			fake:1;
 };
 
+extern int inh_fd_max;
+
 /* reports whether fd_a takes prio over fd_b */
 static inline int fdinfo_rst_prio(struct fdinfo_list_entry *fd_a, struct fdinfo_list_entry *fd_b)
 {