netdev - [PATCH 0/3] ns: tweak ns common handling

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Message-Id: <20250924-work-namespaces-fixes-v1-0-8fb682c8678e@kernel.org>
Date: Wed, 24 Sep 2025 13:33:57 +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>, 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, 
 netdev@...r.kernel.org, Christian Brauner <brauner@...nel.org>
Subject: [PATCH 0/3] ns: tweak ns common handling

This contains three minor tweaks for namespace handling:

* Make struct ns_tree private. There's no need for anything to access
  that directly.

* Drop a debug assert that would trigger in conditions that are benign.

* Move the type of the namespace out of struct proc_ns_operations and
  into struct ns_common. This eliminates a pointer dereference and also
  allows assertions to work when the namespace type is disabled and the
  operations field set to NULL.

"Trust me, just one more fixes series, bro. Just one more, bro."

Signed-off-by: Christian Brauner <brauner@...nel.org>
---
Christian Brauner (3):
      nstree: make struct ns_tree private
      ns: move ns type into struct ns_common
      ns: drop assert

 fs/namespace.c            |  6 +++---
 fs/nsfs.c                 | 18 +++++++++---------
 include/linux/ns_common.h | 30 +++++++++++++++++++++++++-----
 include/linux/nstree.h    | 13 -------------
 include/linux/proc_ns.h   |  1 -
 init/version-timestamp.c  |  1 +
 ipc/msgutil.c             |  1 +
 ipc/namespace.c           |  1 -
 kernel/cgroup/cgroup.c    |  1 +
 kernel/cgroup/namespace.c |  1 -
 kernel/nscommon.c         |  7 +++----
 kernel/nsproxy.c          |  4 ++--
 kernel/nstree.c           | 21 +++++++++++++++++----
 kernel/pid.c              |  1 +
 kernel/pid_namespace.c    |  2 --
 kernel/time/namespace.c   |  3 +--
 kernel/user.c             |  1 +
 kernel/user_namespace.c   |  1 -
 kernel/utsname.c          |  1 -
 net/core/net_namespace.c  |  1 -
 20 files changed, 65 insertions(+), 50 deletions(-)
---
base-commit: d969328c513c6679b4be11a995ffd4d184c25b34
change-id: 20250924-work-namespaces-fixes-99d0c1ce2d86