cgroup_subsys_states_read

Name:cgroup_subsys_states_read

Proto:static int cgroup_subsys_states_read(struct seq_file *seq, void *v)

Type:int

Parameter:

Type	Parameter	Name
struct seq_file *	seq
void *	v

205

212

cgrp = 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

213

If Not cgrp Then Return -ENODEV

217

css = cu_dereference_check() - rcu_dereference with debug checking*@p: The pointer to read, prior to dereferencing*@c: The conditions under which the dereference will take place* Do an rcu_dereference(), but check that the conditions under which the( Private pointers for each registered subsystem [ the following two fields are initialized automtically during boot ], true)

218

If Not css Then Continue

221

pbuf[0] = '\0'

224

If PI: the parent css. Placed here for cache proximity to following* fields of the containing structure. Then snprintf - Format a string and place it in a buffer*@buf: The buffer to place the result into*@size: The size of the buffer, including the trailing null space*@fmt: The format string to use*@

227

seq_printf(seq, "%2d: %-4s\t- %p[%d] %d%s\n", the following two fields are initialized automtically during boot , name, css, PI: Subsys-unique ID. 0 is unused and root is always 1. The* matching css can be looked up using css_from_id()., atomic_read( & Incremented by online self and children. Used to guarantee that* parents are not offlined before their children.), pbuf)

232

group_kn_unlock - unlocking helper for cgroup kernfs methods*@kn: the kernfs_node being serviced* This helper undoes cgroup_kn_lock_live() and should be invoked before* the method finishes if locking succeeded

233

Return 0

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