dump: Make VMA parsing to handle absence of map_files

Needed in testing purposes. Also make free_mappings
being a global one (will need it in restorer).
Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>

cr-dump.c

@@ -56,7 +56,7 @@ static void free_pstree(struct list_head *pstree_list)
 	INIT_LIST_HEAD(pstree_list);
 }
 
-static void free_mappings(struct list_head *vma_area_list)
+void free_mappings(struct list_head *vma_area_list)
 {
 	struct vma_area *vma_area, *p;
 
@@ -78,7 +78,7 @@ static int collect_mappings(pid_t pid, struct list_head *vma_area_list)
 	pr_info("Collecting mappings (pid: %d)\n", pid);
 	pr_info("----------------------------------------\n");
 
-	ret = parse_maps(pid, vma_area_list);
+	ret = parse_maps(pid, vma_area_list, true);
 	if (ret)
 		goto err;
 

include/crtools.h

@@ -76,6 +76,8 @@ int prep_cr_fdset_for_restore(struct cr_fdset *cr_fdset,
 void close_cr_fdset(struct cr_fdset *cr_fdset);
 void free_cr_fdset(struct cr_fdset **cr_fdset);
 
+void free_mappings(struct list_head *vma_area_list);
+
 struct vma_area {
 	struct list_head	list;
 	struct vma_entry	vma;

include/util.h

@@ -151,7 +151,7 @@ void printk_vma(struct vma_area *vma_area);
 #define pr_info_siginfo(siginfo)	printk_siginfo(siginfo)
 
 int reopen_fd_as(int new_fd, int old_fd);
-int parse_maps(pid_t pid, struct list_head *vma_list);
+int parse_maps(pid_t pid, struct list_head *vma_area_list, bool use_map_files);
 int close_safe(int *fd);
 
 void hex_dump(void *addr, unsigned long len);

util.c

@@ -231,7 +231,7 @@ int reopen_fd_as(int new_fd, int old_fd)
 	return new_fd;
 }
 
-int parse_maps(pid_t pid, struct list_head *vma_area_list)
+int parse_maps(pid_t pid, struct list_head *vma_area_list, bool use_map_files)
 {
 	struct vma_area *vma_area = NULL;
 	u64 start, end, pgoff;
@@ -260,7 +260,7 @@ int parse_maps(pid_t pid, struct list_head *vma_area_list)
 	 * I'm debugging it on old kernel ;)
 	 */
 	map_files_dir = opendir(map_files_path);
-	if (!map_files_dir) {
+	if (use_map_files && !map_files_dir) {
 		pr_err("Can't open %s, old kernel?\n",
 		       map_files_path);
 		goto err;