current_cgns_cgroup_from_root

Name:look up cgroup associated with current task's cgroup namespace on the* specified hierarchy

Proto:static struct cgroup *current_cgns_cgroup_from_root(struct cgroup_root *root)

Type:struct cgroup

Parameter:

Type	Parameter	Name
struct cgroup_root *	root

1363

struct cgroup * res = NULL

1366

lockdep_assert_held( & css_set_lock)

1368

_read_lock() - mark the beginning of an RCU read-side critical section* When synchronize_rcu() is invoked on one CPU while other CPUs* are within RCU read-side critical sections, then the* synchronize_rcu() is guaranteed to block until after all the other

1370

cset = root_cset

1371

If cset == The default css_set - used by init and its children prior to any* hierarchies being mounted Then

1372

res = The root cgroup. Root is destroyed on its release.

1373

Else if root == The default hierarchy, reserved for the subsystems that are otherwise* unattached - it never has more than a single cgroup, and all tasks are* part of that cgroup. Then

1374

res = he default cgroup associated with this css_set

1375

Else

1379

c = he cgroup and css_set this link associates

1381

If root == root Then

1382

res = c

1383

Break

1387

_read_unlock() - marks the end of an RCU read-side critical section.* In most situations, rcu_read_unlock() is immune from deadlock.* However, in kernels built with CONFIG_RCU_BOOST, rcu_read_unlock()

1389

1390

Return res

**Caller**
Name	Describe
cgroup_show_path

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