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cgroup: introduce cgroup_init/exit_cftypes()

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Factor out cft->ss initialization into cgroup_init_cftypes() from
cgroup_add_cftypes() and add cft->ss clearing to cgroup_rm_cftypes()
through cgroup_exit_cftypes().

This doesn't make any meaningful difference now but the two new
functions will be expanded during kernfs transition.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
This commit is contained in:
Tejun Heo 2014-02-11 11:52:48 -05:00
parent 5f46990787
commit 2da440a26c
1 changed files with 25 additions and 7 deletions
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32
kernel/cgroup.c
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@ -2770,6 +2770,22 @@ static int cgroup_cfts_commit(struct cftype *cfts, bool is_add)
return ret;
}
static void cgroup_exit_cftypes(struct cftype *cfts)
{
struct cftype *cft;
for (cft = cfts; cft->name[0] != '\0'; cft++)
cft->ss = NULL;
}
static void cgroup_init_cftypes(struct cgroup_subsys *ss, struct cftype *cfts)
{
struct cftype *cft;
for (cft = cfts; cft->name[0] != '\0'; cft++)
cft->ss = ss;
}
/**
* cgroup_add_cftypes - add an array of cftypes to a subsystem
* @ss: target cgroup subsystem
@ -2787,15 +2803,13 @@ static int cgroup_cfts_commit(struct cftype *cfts, bool is_add)
int cgroup_add_cftypes(struct cgroup_subsys *ss, struct cftype *cfts)
{
struct cftype_set *set;
struct cftype *cft;
int ret;
set = kzalloc(sizeof(*set), GFP_KERNEL);
if (!set)
return -ENOMEM;
for (cft = cfts; cft->name[0] != '\0'; cft++)
cft->ss = ss;
cgroup_init_cftypes(ss, cfts);
cgroup_cfts_prepare();
set->cfts = cfts;
@ -2820,6 +2834,7 @@ EXPORT_SYMBOL_GPL(cgroup_add_cftypes);
*/
int cgroup_rm_cftypes(struct cftype *cfts)
{
struct cftype *found = NULL;
struct cftype_set *set;
if (!cfts || !cfts[0].ss)
@ -2831,13 +2846,14 @@ int cgroup_rm_cftypes(struct cftype *cfts)
if (set->cfts == cfts) {
list_del(&set->node);
kfree(set);
cgroup_cfts_commit(cfts, false);
return 0;
found = cfts;
break;
}
}
cgroup_cfts_commit(NULL, false);
return -ENOENT;
cgroup_cfts_commit(found, false);
cgroup_exit_cftypes(cfts);
return found ? 0 : -ENOENT;
}
/**
@ -4596,6 +4612,8 @@ int __init cgroup_init(void)
if (err)
return err;
cgroup_init_cftypes(NULL, cgroup_base_files);
for_each_subsys(ss, i) {
if (!ss->early_init)
cgroup_init_subsys(ss);