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Message-Id: <20250917-work-namespace-ns_common-v1-4-1b3bda8ef8f2@kernel.org>
Date: Wed, 17 Sep 2025 12:28:03 +0200
From: Christian Brauner <brauner@...nel.org>
To: linux-fsdevel@...r.kernel.org
Cc: Amir Goldstein <amir73il@...il.com>, Josef Bacik <josef@...icpanda.com>,
Jeff Layton <jlayton@...nel.org>, Mike Yuan <me@...dnzj.com>,
Zbigniew Jędrzejewski-Szmek <zbyszek@...waw.pl>,
Lennart Poettering <mzxreary@...inter.de>,
Daan De Meyer <daan.j.demeyer@...il.com>, Aleksa Sarai <cyphar@...har.com>,
Alexander Viro <viro@...iv.linux.org.uk>, Jan Kara <jack@...e.cz>,
Tejun Heo <tj@...nel.org>, Johannes Weiner <hannes@...xchg.org>,
Michal Koutný <mkoutny@...e.com>,
Jakub Kicinski <kuba@...nel.org>,
Anna-Maria Behnsen <anna-maria@...utronix.de>,
Frederic Weisbecker <frederic@...nel.org>,
Thomas Gleixner <tglx@...utronix.de>, cgroups@...r.kernel.org,
linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
Christian Brauner <brauner@...nel.org>
Subject: [PATCH 4/9] cgroup: split namespace into separate header
We have dedicated headers for all namespace types. Add one for the
cgroup namespace as well. Now it's consistent for all namespace types
and easy to figure out what to include.
Signed-off-by: Christian Brauner <brauner@...nel.org>
---
include/linux/cgroup.h | 51 +-----------------------------------
include/linux/cgroup_namespace.h | 56 ++++++++++++++++++++++++++++++++++++++++
2 files changed, 57 insertions(+), 50 deletions(-)
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 9ca25346f7cb..5156fed8cbc3 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -27,6 +27,7 @@
#include <linux/kernel_stat.h>
#include <linux/cgroup-defs.h>
+#include <linux/cgroup_namespace.h>
struct kernel_clone_args;
@@ -783,56 +784,6 @@ static inline void cgroup_sk_free(struct sock_cgroup_data *skcd) {}
#endif /* CONFIG_CGROUP_DATA */
-struct cgroup_namespace {
- struct ns_common ns;
- struct user_namespace *user_ns;
- struct ucounts *ucounts;
- struct css_set *root_cset;
-};
-
-extern struct cgroup_namespace init_cgroup_ns;
-
-#ifdef CONFIG_CGROUPS
-
-static inline struct cgroup_namespace *to_cg_ns(struct ns_common *ns)
-{
- return container_of(ns, struct cgroup_namespace, ns);
-}
-
-void free_cgroup_ns(struct cgroup_namespace *ns);
-
-struct cgroup_namespace *copy_cgroup_ns(unsigned long flags,
- struct user_namespace *user_ns,
- struct cgroup_namespace *old_ns);
-
-int cgroup_path_ns(struct cgroup *cgrp, char *buf, size_t buflen,
- struct cgroup_namespace *ns);
-
-static inline void get_cgroup_ns(struct cgroup_namespace *ns)
-{
- refcount_inc(&ns->ns.count);
-}
-
-static inline void put_cgroup_ns(struct cgroup_namespace *ns)
-{
- if (refcount_dec_and_test(&ns->ns.count))
- free_cgroup_ns(ns);
-}
-
-#else /* !CONFIG_CGROUPS */
-
-static inline void free_cgroup_ns(struct cgroup_namespace *ns) { }
-static inline struct cgroup_namespace *
-copy_cgroup_ns(unsigned long flags, struct user_namespace *user_ns,
- struct cgroup_namespace *old_ns)
-{
- return old_ns;
-}
-
-static inline void get_cgroup_ns(struct cgroup_namespace *ns) { }
-static inline void put_cgroup_ns(struct cgroup_namespace *ns) { }
-
-#endif /* !CONFIG_CGROUPS */
#ifdef CONFIG_CGROUPS
diff --git a/include/linux/cgroup_namespace.h b/include/linux/cgroup_namespace.h
new file mode 100644
index 000000000000..c02bb76c5e32
--- /dev/null
+++ b/include/linux/cgroup_namespace.h
@@ -0,0 +1,56 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_CGROUP_NAMESPACE_H
+#define _LINUX_CGROUP_NAMESPACE_H
+
+struct cgroup_namespace {
+ struct ns_common ns;
+ struct user_namespace *user_ns;
+ struct ucounts *ucounts;
+ struct css_set *root_cset;
+};
+
+extern struct cgroup_namespace init_cgroup_ns;
+
+#ifdef CONFIG_CGROUPS
+
+static inline struct cgroup_namespace *to_cg_ns(struct ns_common *ns)
+{
+ return container_of(ns, struct cgroup_namespace, ns);
+}
+
+void free_cgroup_ns(struct cgroup_namespace *ns);
+
+struct cgroup_namespace *copy_cgroup_ns(unsigned long flags,
+ struct user_namespace *user_ns,
+ struct cgroup_namespace *old_ns);
+
+int cgroup_path_ns(struct cgroup *cgrp, char *buf, size_t buflen,
+ struct cgroup_namespace *ns);
+
+static inline void get_cgroup_ns(struct cgroup_namespace *ns)
+{
+ refcount_inc(&ns->ns.count);
+}
+
+static inline void put_cgroup_ns(struct cgroup_namespace *ns)
+{
+ if (refcount_dec_and_test(&ns->ns.count))
+ free_cgroup_ns(ns);
+}
+
+#else /* !CONFIG_CGROUPS */
+
+static inline void free_cgroup_ns(struct cgroup_namespace *ns) { }
+static inline struct cgroup_namespace *
+copy_cgroup_ns(unsigned long flags, struct user_namespace *user_ns,
+ struct cgroup_namespace *old_ns)
+{
+ return old_ns;
+}
+
+static inline void get_cgroup_ns(struct cgroup_namespace *ns) { }
+static inline void put_cgroup_ns(struct cgroup_namespace *ns) { }
+
+#endif /* !CONFIG_CGROUPS */
+
+#endif /* _LINUX_CGROUP_NAMESPACE_H */
--
2.47.3
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