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authorTejun Heo <tj@kernel.org>2013-08-08 20:11:23 -0400
committerTejun Heo <tj@kernel.org>2013-08-08 20:11:23 -0400
commit6387698699afd72d6304566fb6ccf84bffe07c56 (patch)
tree9440e96fa8e5adce62409a5b0e40984dfedaada3 /security
parenta7c6d554aa01236ac2a9f851ab0f75704f76dfa2 (diff)
downloadlinux-6387698699afd72d6304566fb6ccf84bffe07c56.tar.gz
cgroup: add css_parent()
Currently, controllers have to explicitly follow the cgroup hierarchy to find the parent of a given css. cgroup is moving towards using cgroup_subsys_state as the main controller interface construct, so let's provide a way to climb the hierarchy using just csses. This patch implements css_parent() which, given a css, returns its parent. The function is guarnateed to valid non-NULL parent css as long as the target css is not at the top of the hierarchy. freezer, cpuset, cpu, cpuacct, hugetlb, memory, net_cls and devices are converted to use css_parent() instead of accessing cgroup->parent directly. * __parent_ca() is dropped from cpuacct and its usage is replaced with parent_ca(). The only difference between the two was NULL test on cgroup->parent which is now embedded in css_parent() making the distinction moot. Note that eventually a css->parent field will be added to css and the NULL check in css_parent() will go away. This patch shouldn't cause any behavior differences. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Li Zefan <lizefan@huawei.com>
Diffstat (limited to 'security')
-rw-r--r--security/device_cgroup.c18
1 files changed, 5 insertions, 13 deletions
diff --git a/security/device_cgroup.c b/security/device_cgroup.c
index 90953648c64..635a49db005 100644
--- a/security/device_cgroup.c
+++ b/security/device_cgroup.c
@@ -198,13 +198,11 @@ static inline bool is_devcg_online(const struct dev_cgroup *devcg)
*/
static int devcgroup_online(struct cgroup *cgroup)
{
- struct dev_cgroup *dev_cgroup, *parent_dev_cgroup = NULL;
+ struct dev_cgroup *dev_cgroup = cgroup_to_devcgroup(cgroup);
+ struct dev_cgroup *parent_dev_cgroup = css_to_devcgroup(css_parent(&dev_cgroup->css));
int ret = 0;
mutex_lock(&devcgroup_mutex);
- dev_cgroup = cgroup_to_devcgroup(cgroup);
- if (cgroup->parent)
- parent_dev_cgroup = cgroup_to_devcgroup(cgroup->parent);
if (parent_dev_cgroup == NULL)
dev_cgroup->behavior = DEVCG_DEFAULT_ALLOW;
@@ -394,12 +392,10 @@ static bool may_access(struct dev_cgroup *dev_cgroup,
static int parent_has_perm(struct dev_cgroup *childcg,
struct dev_exception_item *ex)
{
- struct cgroup *pcg = childcg->css.cgroup->parent;
- struct dev_cgroup *parent;
+ struct dev_cgroup *parent = css_to_devcgroup(css_parent(&childcg->css));
- if (!pcg)
+ if (!parent)
return 1;
- parent = cgroup_to_devcgroup(pcg);
return may_access(parent, ex, childcg->behavior);
}
@@ -524,15 +520,11 @@ static int devcgroup_update_access(struct dev_cgroup *devcgroup,
char temp[12]; /* 11 + 1 characters needed for a u32 */
int count, rc = 0;
struct dev_exception_item ex;
- struct cgroup *p = devcgroup->css.cgroup;
- struct dev_cgroup *parent = NULL;
+ struct dev_cgroup *parent = css_to_devcgroup(css_parent(&devcgroup->css));
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
- if (p->parent)
- parent = cgroup_to_devcgroup(p->parent);
-
memset(&ex, 0, sizeof(ex));
b = buffer;