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cgroup: relocate cgroup_lock_live_group() and cgroup_attach_task_all()

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cgroup_lock_live_group() and cgroup_attach_task() are scheduled to be
made static.  Relocate the former and cgroup_attach_task_all() so that
we don't need forward declarations.

This patch is pure relocation.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
This commit is contained in:
Tejun Heo 2013-04-07 09:29:51 -07:00
parent 8cc9934520
commit 7ae1bad99e
1 changed files with 42 additions and 42 deletions
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84
kernel/cgroup.c
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@ -329,6 +329,24 @@ static inline struct cftype *__d_cft(struct dentry *dentry)
return __d_cfe(dentry)->type; return __d_cfe(dentry)->type;
} }
/**
* cgroup_lock_live_group - take cgroup_mutex and check that cgrp is alive.
* @cgrp: the cgroup to be checked for liveness
*
* On success, returns true; the lock should be later released with
* cgroup_unlock(). On failure returns false with no lock held.
*/
bool cgroup_lock_live_group(struct cgroup *cgrp)
{
mutex_lock(&cgroup_mutex);
if (cgroup_is_removed(cgrp)) {
mutex_unlock(&cgroup_mutex);
return false;
}
return true;
}
EXPORT_SYMBOL_GPL(cgroup_lock_live_group);
/* the list of cgroups eligible for automatic release. Protected by /* the list of cgroups eligible for automatic release. Protected by
* release_list_lock */ * release_list_lock */
static LIST_HEAD(release_list); static LIST_HEAD(release_list);
@ -1943,30 +1961,6 @@ static void cgroup_task_migrate(struct cgroup *oldcgrp,
put_css_set(oldcg); put_css_set(oldcg);
} }
/**
* cgroup_attach_task_all - attach task 'tsk' to all cgroups of task 'from'
* @from: attach to all cgroups of a given task
* @tsk: the task to be attached
*/
int cgroup_attach_task_all(struct task_struct *from, struct task_struct *tsk)
{
struct cgroupfs_root *root;
int retval = 0;
cgroup_lock();
for_each_active_root(root) {
struct cgroup *from_cg = task_cgroup_from_root(from, root);
retval = cgroup_attach_task(from_cg, tsk, false);
if (retval)
break;
}
cgroup_unlock();
return retval;
}
EXPORT_SYMBOL_GPL(cgroup_attach_task_all);
/** /**
* cgroup_attach_task - attach a task or a whole threadgroup to a cgroup * cgroup_attach_task - attach a task or a whole threadgroup to a cgroup
* @cgrp: the cgroup to attach to * @cgrp: the cgroup to attach to
@ -2204,6 +2198,30 @@ out_unlock_cgroup:
return ret; return ret;
} }
/**
* cgroup_attach_task_all - attach task 'tsk' to all cgroups of task 'from'
* @from: attach to all cgroups of a given task
* @tsk: the task to be attached
*/
int cgroup_attach_task_all(struct task_struct *from, struct task_struct *tsk)
{
struct cgroupfs_root *root;
int retval = 0;
cgroup_lock();
for_each_active_root(root) {
struct cgroup *from_cg = task_cgroup_from_root(from, root);
retval = cgroup_attach_task(from_cg, tsk, false);
if (retval)
break;
}
cgroup_unlock();
return retval;
}
EXPORT_SYMBOL_GPL(cgroup_attach_task_all);
static int cgroup_tasks_write(struct cgroup *cgrp, struct cftype *cft, u64 pid) static int cgroup_tasks_write(struct cgroup *cgrp, struct cftype *cft, u64 pid)
{ {
return attach_task_by_pid(cgrp, pid, false); return attach_task_by_pid(cgrp, pid, false);
@ -2214,24 +2232,6 @@ static int cgroup_procs_write(struct cgroup *cgrp, struct cftype *cft, u64 tgid)
return attach_task_by_pid(cgrp, tgid, true); return attach_task_by_pid(cgrp, tgid, true);
} }
/**
* cgroup_lock_live_group - take cgroup_mutex and check that cgrp is alive.
* @cgrp: the cgroup to be checked for liveness
*
* On success, returns true; the lock should be later released with
* cgroup_unlock(). On failure returns false with no lock held.
*/
bool cgroup_lock_live_group(struct cgroup *cgrp)
{
mutex_lock(&cgroup_mutex);
if (cgroup_is_removed(cgrp)) {
mutex_unlock(&cgroup_mutex);
return false;
}
return true;
}
EXPORT_SYMBOL_GPL(cgroup_lock_live_group);
static int cgroup_release_agent_write(struct cgroup *cgrp, struct cftype *cft, static int cgroup_release_agent_write(struct cgroup *cgrp, struct cftype *cft,
const char *buffer) const char *buffer)
{ {