33  * Final freeing of a group
35 static void fsnotify_final_destroy_group(struct fsnotify_group *group)  in fsnotify_final_destroy_group()  argument
37 	if (group->ops->free_group_priv)  in fsnotify_final_destroy_group()
38 		group->ops->free_group_priv(group);  in fsnotify_final_destroy_group()
40 	mem_cgroup_put(group->memcg);  in fsnotify_final_destroy_group()
42 	kfree(group);  in fsnotify_final_destroy_group()
46  * Stop queueing new events for this group. Once this function returns
47  * fsnotify_add_event() will not add any new events to the group's queue.
49 void fsnotify_group_stop_queueing(struct fsnotify_group *group)  in fsnotify_group_stop_queueing()  argument
51 	spin_lock(&group->notification_lock);  in fsnotify_group_stop_queueing()
52 	group->shutdown = true;  in fsnotify_group_stop_queueing()
53 	spin_unlock(&group->notification_lock);  in fsnotify_group_stop_queueing()
57  * Trying to get rid of a group. Remove all marks, flush all events and release
58  * the group reference.
60  * hold a ref to the group.
62 void fsnotify_destroy_group(struct fsnotify_group *group)  in fsnotify_destroy_group()  argument
70 	fsnotify_group_stop_queueing(group);  in fsnotify_destroy_group()
72 	/* Clear all marks for this group and queue them for destruction */  in fsnotify_destroy_group()
73 	fsnotify_clear_marks_by_group(group, FSNOTIFY_OBJ_ALL_TYPES_MASK);  in fsnotify_destroy_group()
80 	wait_event(group->notification_waitq, !atomic_read(&group->user_waits));  in fsnotify_destroy_group()
93 	 * notification against this group. So clearing the notification queue  in fsnotify_destroy_group()
96 	fsnotify_flush_notify(group);  in fsnotify_destroy_group()
102 	if (group->overflow_event)  in fsnotify_destroy_group()
103 		group->ops->free_event(group->overflow_event);  in fsnotify_destroy_group()
105 	fsnotify_put_group(group);  in fsnotify_destroy_group()
109  * Get reference to a group.
111 void fsnotify_get_group(struct fsnotify_group *group)  in fsnotify_get_group()  argument
113 	refcount_inc(&group->refcnt);  in fsnotify_get_group()
117  * Drop a reference to a group.  Free it if it's through.
119 void fsnotify_put_group(struct fsnotify_group *group)  in fsnotify_put_group()  argument
121 	if (refcount_dec_and_test(&group->refcnt))  in fsnotify_put_group()
122 		fsnotify_final_destroy_group(group);  in fsnotify_put_group()
126  * Create a new fsnotify_group and hold a reference for the group returned.
130 	struct fsnotify_group *group;  in fsnotify_alloc_group()  local
132 	group = kzalloc(sizeof(struct fsnotify_group), GFP_KERNEL);  in fsnotify_alloc_group()
133 	if (!group)  in fsnotify_alloc_group()
136 	/* set to 0 when there a no external references to this group */  in fsnotify_alloc_group()
137 	refcount_set(&group->refcnt, 1);  in fsnotify_alloc_group()
138 	atomic_set(&group->num_marks, 0);  in fsnotify_alloc_group()
139 	atomic_set(&group->user_waits, 0);  in fsnotify_alloc_group()
141 	spin_lock_init(&group->notification_lock);  in fsnotify_alloc_group()
142 	INIT_LIST_HEAD(&group->notification_list);  in fsnotify_alloc_group()
143 	init_waitqueue_head(&group->notification_waitq);  in fsnotify_alloc_group()
144 	group->max_events = UINT_MAX;  in fsnotify_alloc_group()
146 	mutex_init(&group->mark_mutex);  in fsnotify_alloc_group()
147 	INIT_LIST_HEAD(&group->marks_list);  in fsnotify_alloc_group()
149 	group->ops = ops;  in fsnotify_alloc_group()
151 	return group;  in fsnotify_alloc_group()
156 	struct fsnotify_group *group = file->private_data;  in fsnotify_fasync()  local
158 	return fasync_helper(fd, file, on, &group->fsn_fa) >= 0 ? 0 : -EIO;  in fsnotify_fasync()