configfs: switch ->default groups to a linked list

Replace the current NULL-terminated array of default groups with a linked
list.  This gets rid of lots of nasty code to size and/or dynamically
allocate the array.

While we're at it also provide a conveniant helper to remove the default
groups.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Felipe Balbi <balbi@kernel.org>		[drivers/usb/gadget]
Acked-by: Joel Becker <jlbec@evilplan.org>
Acked-by: Nicholas Bellinger <nab@linux-iscsi.org>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>

1 files changed, 10 insertions, 1 deletions

diff --git a/include/linux/configfs.h b/include/linux/configfs.h
index f8165c129ccb..485fe5519448 100644
--- a/include/linux/configfs.h
+++ b/include/linux/configfs.h
@@ -96,7 +96,8 @@ struct config_group {
         struct config_item              cg_item;
         struct list_head                cg_children;
         struct configfs_subsystem       *cg_subsys;
-        struct config_group             **default_groups;
+        struct list_head                default_groups;
+        struct list_head                group_entry;
 };
 
 extern void config_group_init(struct config_group *group);
@@ -123,6 +124,12 @@ extern struct config_item *config_group_find_item(struct config_group *,
                                                   const char *);
 
 
+static inline void configfs_add_default_group(struct config_group *new_group,
+                struct config_group *group)
+{
+        list_add_tail(&new_group->group_entry, &group->default_groups);
+}
+
 struct configfs_attribute {
         const char              *ca_name;
         struct module           *ca_owner;
@@ -251,6 +258,8 @@ int configfs_register_group(struct config_group *parent_group,
                             struct config_group *group);
 void configfs_unregister_group(struct config_group *group);
 
+void configfs_remove_default_groups(struct config_group *group);
+
 struct config_group *
 configfs_register_default_group(struct config_group *parent_group,
                                 const char *name,