From: Tejun Heo <tj@kernel.org>
To: lizefan@huawei.com, hannes@cmpxchg.org
Cc: cgroups@vger.kernel.org, linux-kernel@vger.kernel.org,
kernel-team@fb.com, Tejun Heo <tj@kernel.org>
Subject: [PATCH 03/12] cgroup: reorder operations in cgroup_mkdir()
Date: Mon, 22 Feb 2016 22:45:37 -0500 [thread overview]
Message-ID: <1456199146-14765-4-git-send-email-tj@kernel.org> (raw)
In-Reply-To: <1456199146-14765-1-git-send-email-tj@kernel.org>
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>
---
kernel/cgroup.c | 61 ++++++++++++++++++++++++++++-----------------------------
1 file changed, 30 insertions(+), 31 deletions(-)
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 9e5caf0..dd550b3 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -4941,20 +4941,6 @@ static int cgroup_mkdir(struct kernfs_node *parent_kn, const char *name,
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 */
@@ -4968,15 +4954,7 @@ static int cgroup_mkdir(struct kernfs_node *parent_kn, const char *name,
*/
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;
@@ -4985,12 +4963,6 @@ static int cgroup_mkdir(struct kernfs_node *parent_kn, const char *name,
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();
/*
@@ -5002,13 +4974,40 @@ static int cgroup_mkdir(struct kernfs_node *parent_kn, const char *name,
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:
--
2.5.0
next prev parent reply other threads:[~2016-02-23 3:45 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-23 3:45 [PATCHSET cgroup/for-4.6] cgroup: make control mask updates modular and recursive Tejun Heo
2016-02-23 3:45 ` [PATCH 01/12] cgroup: separate out interface file creation from css creation Tejun Heo
2016-02-23 3:45 ` [PATCH 02/12] cgroup: explicitly track whether a cgroup_subsys_state is visible to userland Tejun Heo
2016-02-23 3:45 ` Tejun Heo [this message]
2016-02-23 3:45 ` [PATCH 04/12] cgroup: factor out cgroup_create() out of cgroup_mkdir() Tejun Heo
2016-02-23 3:45 ` [PATCH 05/12] cgroup: introduce cgroup_control() and cgroup_ss_mask() Tejun Heo
2016-02-23 3:45 ` [PATCH 06/12] cgroup: factor out cgroup_drain_offline() from cgroup_subtree_control_write() Tejun Heo
2016-02-23 3:45 ` [PATCH 09/12] cgroup: make cgroup_drain_offline() and cgroup_apply_control_{disable|enable}() recursive Tejun Heo
2016-02-23 3:45 ` [PATCH 10/12] cgroup: introduce cgroup_{save|propagate|restore}_control() Tejun Heo
[not found] ` <1456199146-14765-1-git-send-email-tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2016-02-23 3:45 ` [PATCH 07/12] cgroup: factor out cgroup_apply_control_disable() from cgroup_subtree_control_write() Tejun Heo
2016-02-23 3:45 ` [PATCH 08/12] cgroup: factor out cgroup_apply_control_enable() " Tejun Heo
2016-02-23 3:45 ` [PATCH 11/12] cgroup: Factor out cgroup_{apply|finalize}_control() " Tejun Heo
2016-02-23 3:45 ` [PATCH 12/12] cgroup: make cgroup_calc_subtree_ss_mask() take @this_ss_mask Tejun Heo
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