cgroup_lock_and_drain

Name:group_lock_and_drain_offline - lock cgroup_mutex and drain offlined csses*@cgrp: root of the target subtree* Because css offlining is asynchronous, userland may try to re-enable a* controller while the previous css is still around. This function grabs

Proto:void cgroup_lock_and_drain_offline(struct cgroup *cgrp)__acquires(&cgroup_mutex)

Type:void

Parameter:

Type	Parameter	Name
struct cgroup *	cgrp

2936

restart :

2937

mutex_lock( & cgroup_mutex is the master lock)

2939

walk live descendants in postorder (dsct, d_css, cgrp)

2941

css = group_css - obtain a cgroup's css for the specified subsystem*@cgrp: the cgroup of interest*@ss: the subsystem of interest (%NULL returns @cgrp->self)* Return @cgrp's css (cgroup_subsys_state) associated with @ss

2942

DEFINE_WAIT(wait)

2944

If Not css || Not percpu_ref_is_dying - test whether a percpu refcount is dying or dead*@ref: percpu_ref to test* Returns %true if @ref is dying or dead.* This function is safe to call as long as @ref is between init and exit Then Continue

2947

cgroup_get_live(dsct)

2948

Note: we use "set_current_state()" _after_ the wait-queue add,* because we need a memory barrier there on SMP, so that any* wake-function that tests for the wait-queue being active* will be guaranteed to see waitqueue addition _or_ subsequent

2951

mutex_unlock - release the mutex*@lock: the mutex to be released* Unlock a mutex that has been locked by this task previously.* This function must not be used in interrupt context. Unlocking* of a not locked mutex is not allowed.

2952

schedule()

2953

sh_wait - clean up after waiting in a queue*@wq_head: waitqueue waited on*@wq_entry: wait descriptor* Sets current thread back to running state and removes* the wait descriptor from the given waitqueue if still* queued.

2955

cgroup_put(dsct)

2956

Go to restart

**Caller**
Name	Describe
cgroup_destroy_root
cgroup_kn_lock_live	group_kn_lock_live - locking helper for cgroup kernfs methods@kn: the kernfs_node being serviced@drain_offline: perform offline draining on the cgroup* This helper is to be used by a cgroup kernfs method currently servicing*@kn
cgroup1_reconfigure
cgroup1_get_tree

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Function report