cgroup: reorder operations in cgroup_mkdir()
Currently, operations to initialize internal objects and create
interface directory and files are intermixed in cgroup_mkdir(). We're
in the process of refactoring cgroup and css management paths to
separate them out to eventually allow cgroups which aren't visible
through cgroup fs.
This patch reorders operations inside cgroup_mkdir() so that interface
directory and file handling comes after internal object
initialization. This will enable further refactoring.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Zefan Li <lizefan@huawei.com>
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index a9a53ca..a6d484a 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -4945,20 +4945,6 @@
if (test_bit(CGRP_CPUSET_CLONE_CHILDREN, &parent->flags))
set_bit(CGRP_CPUSET_CLONE_CHILDREN, &cgrp->flags);
- /* create the directory */
- kn = kernfs_create_dir(parent->kn, name, mode, cgrp);
- if (IS_ERR(kn)) {
- ret = PTR_ERR(kn);
- goto out_free_id;
- }
- cgrp->kn = kn;
-
- /*
- * This extra ref will be put in cgroup_free_fn() and guarantees
- * that @cgrp->kn is always accessible.
- */
- kernfs_get(kn);
-
cgrp->self.serial_nr = css_serial_nr_next++;
/* allocation complete, commit to creation */
@@ -4972,15 +4958,7 @@
*/
cgroup_idr_replace(&root->cgroup_idr, cgrp, cgrp->id);
- ret = cgroup_kn_set_ugid(kn);
- if (ret)
- goto out_destroy;
-
- ret = css_populate_dir(&cgrp->self, NULL);
- if (ret)
- goto out_destroy;
-
- /* let's create and online css's */
+ /* create the csses */
do_each_subsys_mask(ss, ssid, parent->subtree_ss_mask) {
struct cgroup_subsys_state *css;
@@ -4989,12 +4967,6 @@
ret = PTR_ERR(css);
goto out_destroy;
}
-
- if (parent->subtree_control & (1 << ssid)) {
- ret = css_populate_dir(css, NULL);
- if (ret)
- goto out_destroy;
- }
} while_each_subsys_mask();
/*
@@ -5006,13 +4978,40 @@
cgroup_refresh_subtree_ss_mask(cgrp);
}
+ /* create the directory */
+ kn = kernfs_create_dir(parent->kn, name, mode, cgrp);
+ if (IS_ERR(kn)) {
+ ret = PTR_ERR(kn);
+ goto out_destroy;
+ }
+ cgrp->kn = kn;
+
+ /*
+ * This extra ref will be put in cgroup_free_fn() and guarantees
+ * that @cgrp->kn is always accessible.
+ */
+ kernfs_get(kn);
+
+ ret = cgroup_kn_set_ugid(kn);
+ if (ret)
+ goto out_destroy;
+
+ ret = css_populate_dir(&cgrp->self, NULL);
+ if (ret)
+ goto out_destroy;
+
+ do_each_subsys_mask(ss, ssid, parent->subtree_control) {
+ ret = css_populate_dir(cgroup_css(cgrp, ss), NULL);
+ if (ret)
+ goto out_destroy;
+ } while_each_subsys_mask();
+
+ /* let's create and online css's */
kernfs_activate(kn);
ret = 0;
goto out_unlock;
-out_free_id:
- cgroup_idr_remove(&root->cgroup_idr, cgrp->id);
out_cancel_ref:
percpu_ref_exit(&cgrp->self.refcnt);
out_free_cgrp: