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Date: Thu, 4 Apr 2013 16:36:26 -0700
From: Tejun Heo <tj@...nel.org>
To: lizefan@...wei.com
Cc: containers@...ts.linux-foundation.org, cgroups@...r.kernel.org,
linux-kernel@...r.kernel.org, Tejun Heo <tj@...nel.org>
Subject: [PATCH 2/5] cgroup: relocate cgroup_lock_live_group() and cgroup_attach_task_all()
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@...nel.org>
---
kernel/cgroup.c | 84 ++++++++++++++++++++++++++++-----------------------------
1 file changed, 42 insertions(+), 42 deletions(-)
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 147d7cc..ae76170 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -329,6 +329,24 @@ static inline struct cftype *__d_cft(struct dentry *dentry)
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
* release_list_lock */
static LIST_HEAD(release_list);
@@ -1944,30 +1962,6 @@ static void cgroup_task_migrate(struct cgroup *oldcgrp,
}
/**
- * 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
* @cgrp: the cgroup to attach to
* @tsk: the task or the leader of the threadgroup to be attached
@@ -2204,6 +2198,30 @@ out_unlock_cgroup:
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)
{
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);
}
-/**
- * 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,
const char *buffer)
{
--
1.8.1.4
--
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