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cgroup: remove cgroup->control_kn

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Now that cgroup_subtree_control_write() has access to the associated
kernfs_open_file and thus the kernfs_node, there's no need to cache it
in cgroup->control_kn on creation.  Remove cgroup->control_kn and use
@of->kn directly.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
This commit is contained in:
Tejun Heo 2014-05-13 12:16:22 -04:00
parent acbef755f4
commit b7fc5ad235
2 changed files with 3 additions and 6 deletions
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1
include/linux/cgroup.h
View File

@ -177,7 +177,6 @@ struct cgroup {
struct cgroup *parent; /* my parent */
struct kernfs_node *kn; /* cgroup kernfs entry */
struct kernfs_node *control_kn; /* kn for "cgroup.subtree_control" */
struct kernfs_node *populated_kn; /* kn for "cgroup.subtree_populated" */
/*

8
kernel/cgroup.c
View File

@ -2580,7 +2580,7 @@ static ssize_t cgroup_subtree_control_write(struct kernfs_open_file *of,
* active_ref protection.
*/
cgroup_get(cgrp);
kernfs_break_active_protection(cgrp->control_kn);
kernfs_break_active_protection(of->kn);
mutex_lock(&cgroup_tree_mutex);
@ -2697,7 +2697,7 @@ out_unlock:
out_unlock_tree:
mutex_unlock(&cgroup_tree_mutex);
out_unbreak:
kernfs_unbreak_active_protection(cgrp->control_kn);
kernfs_unbreak_active_protection(of->kn);
cgroup_put(cgrp);
return ret ?: nbytes;
@ -2887,9 +2887,7 @@ static int cgroup_add_file(struct cgroup *cgrp, struct cftype *cft)
return ret;
}
if (cft->seq_show == cgroup_subtree_control_show)
cgrp->control_kn = kn;
else if (cft->seq_show == cgroup_populated_show)
if (cft->seq_show == cgroup_populated_show)
cgrp->populated_kn = kn;
return 0;
}