fsnotify: remove global fsnotify groups lists

[net-next-2.6.git] / fs / notify / group.c

diff --git a/fs/notify/group.c b/fs/notify/group.c
index fc0d966b270f74401047178050b1e27b8616bbeb..d309f38449cbb6f2e3a8a8cbc9a903944679bd39 100644 (file)
--- a/fs/notify/group.c
+++ b/fs/notify/group.c
@@ -28,67 +28,6 @@
 
 #include <asm/atomic.h>
 
-/* protects writes to fsnotify_groups and fsnotify_mask */
-static DEFINE_MUTEX(fsnotify_grp_mutex);
-/* all groups registered to receive inode filesystem notifications */
-LIST_HEAD(fsnotify_inode_groups);
-/* all groups registered to receive mount point filesystem notifications */
-LIST_HEAD(fsnotify_vfsmount_groups);
-
-void fsnotify_add_vfsmount_group(struct fsnotify_group *group)
-{
-       struct fsnotify_group *group_iter;
-
-       mutex_lock(&fsnotify_grp_mutex);
-
-       if (!group->on_vfsmount_group_list) {
-               list_for_each_entry(group_iter, &fsnotify_vfsmount_groups,
-                                   vfsmount_group_list) {
-                       /* insert in front of this one? */
-                       if (group < group_iter) {
-                               /* list_add_tail() insert in front of group_iter */
-                               list_add_tail_rcu(&group->inode_group_list,
-                                                 &group_iter->inode_group_list);
-                               goto out;
-                       }
-               }
-
-               /* apparently we need to be the last entry */
-               list_add_tail_rcu(&group->vfsmount_group_list, &fsnotify_vfsmount_groups);
-       }
-out:
-       group->on_vfsmount_group_list = 1;
-
-       mutex_unlock(&fsnotify_grp_mutex);
-}
-
-void fsnotify_add_inode_group(struct fsnotify_group *group)
-{
-       struct fsnotify_group *group_iter;
-
-       mutex_lock(&fsnotify_grp_mutex);
-
-       /* add to global group list */
-       if (!group->on_inode_group_list) {
-               list_for_each_entry(group_iter, &fsnotify_inode_groups,
-                                   inode_group_list) {
-                       if (group < group_iter) {
-                               /* list_add_tail() insert in front of group_iter */
-                               list_add_tail_rcu(&group->inode_group_list,
-                                                 &group_iter->inode_group_list);
-                               goto out;
-                       }
-               }
-
-               /* apparently we need to be the last entry */
-               list_add_tail_rcu(&group->inode_group_list, &fsnotify_inode_groups);
-       }
-out:
-       group->on_inode_group_list = 1;
-
-       mutex_unlock(&fsnotify_grp_mutex);
-}
-
 /*
  * Final freeing of a group
  */
@@ -123,52 +62,13 @@ static void fsnotify_destroy_group(struct fsnotify_group *group)
                fsnotify_final_destroy_group(group);
 }
 
-/*
- * Remove this group from the global list of groups that will get events
- * this can be done even if there are still references and things still using
- * this group.  This just stops the group from getting new events.
- */
-static void __fsnotify_evict_group(struct fsnotify_group *group)
-{
-       BUG_ON(!mutex_is_locked(&fsnotify_grp_mutex));
-
-       if (group->on_inode_group_list)
-               list_del_rcu(&group->inode_group_list);
-       group->on_inode_group_list = 0;
-       if (group->on_vfsmount_group_list)
-               list_del_rcu(&group->vfsmount_group_list);
-       group->on_vfsmount_group_list = 0;
-}
-
-/*
- * Called when a group is no longer interested in getting events.  This can be
- * used if a group is misbehaving or if for some reason a group should no longer
- * get any filesystem events.
- */
-void fsnotify_evict_group(struct fsnotify_group *group)
-{
-       mutex_lock(&fsnotify_grp_mutex);
-       __fsnotify_evict_group(group);
-       mutex_unlock(&fsnotify_grp_mutex);
-}
-
 /*
  * Drop a reference to a group.  Free it if it's through.
  */
 void fsnotify_put_group(struct fsnotify_group *group)
 {
-       if (!atomic_dec_and_mutex_lock(&group->refcnt, &fsnotify_grp_mutex))
-               return;
-
-       /*
-        * OK, now we know that there's no other users *and* we hold mutex,
-        * so no new references will appear
-        */
-       __fsnotify_evict_group(group);
-
-       mutex_unlock(&fsnotify_grp_mutex);
-
-       fsnotify_destroy_group(group);
+       if (atomic_dec_and_test(&group->refcnt))
+               fsnotify_destroy_group(group);
 }
 
 /*
@@ -195,9 +95,6 @@ struct fsnotify_group *fsnotify_alloc_group(const struct fsnotify_ops *ops)
        init_waitqueue_head(&group->notification_waitq);
        group->max_events = UINT_MAX;
 
-       INIT_LIST_HEAD(&group->inode_group_list);
-       INIT_LIST_HEAD(&group->vfsmount_group_list);
-
        spin_lock_init(&group->mark_lock);
        INIT_LIST_HEAD(&group->marks_list);