utils_disk: add name_prev pointer to struct parameter_list

Also added handling of name_prev in np_add_parameter and np_delete_parameter.
This make calling the np_delete_parameter function easier, because it requires
the previous element as second argument.

1 files changed, 1 insertions, 0 deletions

diff --git a/lib/utils_disk.h b/lib/utils_disk.h
index bf52e4c..3b5a45f 100644
--- a/lib/utils_disk.h
+++ b/lib/utils_disk.h
@@ -24,6 +24,7 @@ struct parameter_list
   char *group;
   struct mount_entry *best_match;
   struct parameter_list *name_next;
+  struct parameter_list *name_prev;
   uintmax_t total, available, available_to_root, used,
     inodes_free, inodes_free_to_root, inodes_used, inodes_total;
   double dfree_pct, dused_pct;