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-rw-r--r--include/linux/cgroup.h24
1 files changed, 24 insertions, 0 deletions
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 2a59d3101e5d..b4f2201321cd 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -235,6 +235,10 @@ struct cgroup {
/* For RCU-protected deletion */
struct rcu_head rcu_head;
+
+ /* List of events which userspace want to recieve */
+ struct list_head event_list;
+ spinlock_t event_list_lock;
};
/*
@@ -378,6 +382,26 @@ struct cftype {
int (*trigger)(struct cgroup *cgrp, unsigned int event);
int (*release)(struct inode *inode, struct file *file);
+
+ /*
+ * register_event() callback will be used to add new userspace
+ * waiter for changes related to the cftype. Implement it if
+ * you want to provide this functionality. Use eventfd_signal()
+ * on eventfd to send notification to userspace.
+ */
+ int (*register_event)(struct cgroup *cgrp, struct cftype *cft,
+ struct eventfd_ctx *eventfd, const char *args);
+ /*
+ * unregister_event() callback will be called when userspace
+ * closes the eventfd or on cgroup removing.
+ * This callback must be implemented, if you want provide
+ * notification functionality.
+ *
+ * Be careful. It can be called after destroy(), so you have
+ * to keep all nesessary data, until all events are removed.
+ */
+ int (*unregister_event)(struct cgroup *cgrp, struct cftype *cft,
+ struct eventfd_ctx *eventfd);
};
struct cgroup_scanner {