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>
diff --git a/fs/configfs/dir.c b/fs/configfs/dir.c
index f419519..b51ce67 100644
--- a/fs/configfs/dir.c
+++ b/fs/configfs/dir.c
@@ -701,23 +701,29 @@
{
struct config_group *new_group;
int ret = 0;
- int i;
- if (group->default_groups) {
- for (i = 0; group->default_groups[i]; i++) {
- new_group = group->default_groups[i];
-
- ret = create_default_group(group, new_group);
- if (ret) {
- detach_groups(group);
- break;
- }
+ list_for_each_entry(new_group, &group->default_groups, group_entry) {
+ ret = create_default_group(group, new_group);
+ if (ret) {
+ detach_groups(group);
+ break;
}
}
return ret;
}
+void configfs_remove_default_groups(struct config_group *group)
+{
+ struct config_group *g, *n;
+
+ list_for_each_entry_safe(g, n, &group->default_groups, group_entry) {
+ list_del(&g->group_entry);
+ config_item_put(&g->cg_item);
+ }
+}
+EXPORT_SYMBOL(configfs_remove_default_groups);
+
/*
* All of link_obj/unlink_obj/link_group/unlink_group require that
* subsys->su_mutex is held.
@@ -766,15 +772,10 @@
static void unlink_group(struct config_group *group)
{
- int i;
struct config_group *new_group;
- if (group->default_groups) {
- for (i = 0; group->default_groups[i]; i++) {
- new_group = group->default_groups[i];
- unlink_group(new_group);
- }
- }
+ list_for_each_entry(new_group, &group->default_groups, group_entry)
+ unlink_group(new_group);
group->cg_subsys = NULL;
unlink_obj(&group->cg_item);
@@ -782,7 +783,6 @@
static void link_group(struct config_group *parent_group, struct config_group *group)
{
- int i;
struct config_group *new_group;
struct configfs_subsystem *subsys = NULL; /* gcc is a turd */
@@ -796,12 +796,8 @@
BUG();
group->cg_subsys = subsys;
- if (group->default_groups) {
- for (i = 0; group->default_groups[i]; i++) {
- new_group = group->default_groups[i];
- link_group(group, new_group);
- }
- }
+ list_for_each_entry(new_group, &group->default_groups, group_entry)
+ link_group(group, new_group);
}
/*
