linux-kernel - Re: [PATCH 1/9] uts: split namespace into separate header

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Message-ID: <aoqhkflvxtqwo6xg72pqhuqz6khzqiqpjh2xoboubhv3kctjpo@bheczoufd5yh>
Date: Wed, 17 Sep 2025 18:28:05 +0200
From: Jan Kara <jack@...e.cz>
To: Christian Brauner <brauner@...nel.org>
Cc: linux-fsdevel@...r.kernel.org, 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
Subject: Re: [PATCH 1/9] uts: split namespace into separate header

On Wed 17-09-25 12:28:00, Christian Brauner wrote:
> We have dedicated headers for all namespace types. Add one for the uts
> namespace as well. Now it's consistent for all namespace types.
> 
> Signed-off-by: Christian Brauner <brauner@...nel.org>

Fine by me. Feel free to add:

Reviewed-by: Jan Kara <jack@...e.cz>

								Honza

> ---
>  include/linux/uts_namespace.h | 65 +++++++++++++++++++++++++++++++++++++++++++
>  include/linux/utsname.h       | 58 +-------------------------------------
>  2 files changed, 66 insertions(+), 57 deletions(-)
> 
> diff --git a/include/linux/uts_namespace.h b/include/linux/uts_namespace.h
> new file mode 100644
> index 000000000000..c2b619bb4e57
> --- /dev/null
> +++ b/include/linux/uts_namespace.h
> @@ -0,0 +1,65 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef _LINUX_UTS_NAMESPACE_H
> +#define _LINUX_UTS_NAMESPACE_H
> +
> +#include <linux/ns_common.h>
> +#include <uapi/linux/utsname.h>
> +
> +struct user_namespace;
> +extern struct user_namespace init_user_ns;
> +
> +struct uts_namespace {
> +	struct new_utsname name;
> +	struct user_namespace *user_ns;
> +	struct ucounts *ucounts;
> +	struct ns_common ns;
> +} __randomize_layout;
> +
> +extern struct uts_namespace init_uts_ns;
> +
> +#ifdef CONFIG_UTS_NS
> +static inline struct uts_namespace *to_uts_ns(struct ns_common *ns)
> +{
> +	return container_of(ns, struct uts_namespace, ns);
> +}
> +
> +static inline void get_uts_ns(struct uts_namespace *ns)
> +{
> +	refcount_inc(&ns->ns.count);
> +}
> +
> +extern struct uts_namespace *copy_utsname(unsigned long flags,
> +	struct user_namespace *user_ns, struct uts_namespace *old_ns);
> +extern void free_uts_ns(struct uts_namespace *ns);
> +
> +static inline void put_uts_ns(struct uts_namespace *ns)
> +{
> +	if (refcount_dec_and_test(&ns->ns.count))
> +		free_uts_ns(ns);
> +}
> +
> +void uts_ns_init(void);
> +#else
> +static inline void get_uts_ns(struct uts_namespace *ns)
> +{
> +}
> +
> +static inline void put_uts_ns(struct uts_namespace *ns)
> +{
> +}
> +
> +static inline struct uts_namespace *copy_utsname(unsigned long flags,
> +	struct user_namespace *user_ns, struct uts_namespace *old_ns)
> +{
> +	if (flags & CLONE_NEWUTS)
> +		return ERR_PTR(-EINVAL);
> +
> +	return old_ns;
> +}
> +
> +static inline void uts_ns_init(void)
> +{
> +}
> +#endif
> +
> +#endif /* _LINUX_UTS_NAMESPACE_H */
> diff --git a/include/linux/utsname.h b/include/linux/utsname.h
> index 5d34c4f0f945..547bd4439706 100644
> --- a/include/linux/utsname.h
> +++ b/include/linux/utsname.h
> @@ -7,7 +7,7 @@
>  #include <linux/nsproxy.h>
>  #include <linux/ns_common.h>
>  #include <linux/err.h>
> -#include <uapi/linux/utsname.h>
> +#include <linux/uts_namespace.h>
>  
>  enum uts_proc {
>  	UTS_PROC_ARCH,
> @@ -18,62 +18,6 @@ enum uts_proc {
>  	UTS_PROC_DOMAINNAME,
>  };
>  
> -struct user_namespace;
> -extern struct user_namespace init_user_ns;
> -
> -struct uts_namespace {
> -	struct new_utsname name;
> -	struct user_namespace *user_ns;
> -	struct ucounts *ucounts;
> -	struct ns_common ns;
> -} __randomize_layout;
> -extern struct uts_namespace init_uts_ns;
> -
> -#ifdef CONFIG_UTS_NS
> -static inline struct uts_namespace *to_uts_ns(struct ns_common *ns)
> -{
> -	return container_of(ns, struct uts_namespace, ns);
> -}
> -
> -static inline void get_uts_ns(struct uts_namespace *ns)
> -{
> -	refcount_inc(&ns->ns.count);
> -}
> -
> -extern struct uts_namespace *copy_utsname(unsigned long flags,
> -	struct user_namespace *user_ns, struct uts_namespace *old_ns);
> -extern void free_uts_ns(struct uts_namespace *ns);
> -
> -static inline void put_uts_ns(struct uts_namespace *ns)
> -{
> -	if (refcount_dec_and_test(&ns->ns.count))
> -		free_uts_ns(ns);
> -}
> -
> -void uts_ns_init(void);
> -#else
> -static inline void get_uts_ns(struct uts_namespace *ns)
> -{
> -}
> -
> -static inline void put_uts_ns(struct uts_namespace *ns)
> -{
> -}
> -
> -static inline struct uts_namespace *copy_utsname(unsigned long flags,
> -	struct user_namespace *user_ns, struct uts_namespace *old_ns)
> -{
> -	if (flags & CLONE_NEWUTS)
> -		return ERR_PTR(-EINVAL);
> -
> -	return old_ns;
> -}
> -
> -static inline void uts_ns_init(void)
> -{
> -}
> -#endif
> -
>  #ifdef CONFIG_PROC_SYSCTL
>  extern void uts_proc_notify(enum uts_proc proc);
>  #else
> 
> -- 
> 2.47.3
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR