Switch mtab_list to doubly linked so we can traverse in either order. Convert umount and df. Add dlist_terminate() to break lists for traversal in either direction.

1 files changed, 2 insertions, 1 deletions

diff --git a/lib/lib.h b/lib/lib.h
index bbb1488d..09af2837 100644
--- a/lib/lib.h
+++ b/lib/lib.h
@@ -31,6 +31,7 @@ void *llist_pop(void *list);  // actually void **list
 void *dlist_pop(void *list);  // actually struct double_list **list
 void dlist_add_nomalloc(struct double_list **list, struct double_list *new);
 struct double_list *dlist_add(struct double_list **list, char *data);
+void *dlist_terminate(void *list);
 
 // args.c
 void get_optflags(void);
@@ -162,7 +163,7 @@ int xsocket(int domain, int type, int protocol);
 
 // getmountlist.c
 struct mtab_list {
-  struct mtab_list *next;
+  struct mtab_list *next, *prev;
   struct stat stat;
   struct statvfs statvfs;
   char *dir;