linux-kernel - [PATCH 7/9] net: centralize ns

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Message-Id: <20250917-work-namespace-ns_common-v1-7-1b3bda8ef8f2@kernel.org>
Date: Wed, 17 Sep 2025 12:28:06 +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 7/9] net: centralize ns_common initialization

Centralize ns_common initialization.

Signed-off-by: Christian Brauner <brauner@...nel.org>
---
 net/core/net_namespace.c | 23 +++--------------------
 1 file changed, 3 insertions(+), 20 deletions(-)

diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index a57b3cda8dbc..897f4927df9e 100644
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -409,7 +409,7 @@ static __net_init int preinit_net(struct net *net, struct user_namespace *user_n
 	ns_ops = NULL;
 #endif
 
-	ret = ns_common_init(&net->ns, ns_ops, false);
+	ret = ns_common_init(&net->ns, ns_ops, true);
 	if (ret)
 		return ret;
 
@@ -597,6 +597,7 @@ struct net *copy_net_ns(unsigned long flags,
 		net_passive_dec(net);
 dec_ucounts:
 		dec_net_namespaces(ucounts);
+		ns_free_inum(&net->ns);
 		return ERR_PTR(rv);
 	}
 	return net;
@@ -718,6 +719,7 @@ static void cleanup_net(struct work_struct *work)
 #endif
 		put_user_ns(net->user_ns);
 		net_passive_dec(net);
+		ns_free_inum(&net->ns);
 	}
 	WRITE_ONCE(cleanup_net_task, NULL);
 }
@@ -831,31 +833,12 @@ static void net_ns_net_debugfs(struct net *net)
 
 static __net_init int net_ns_net_init(struct net *net)
 {
-	int ret = 0;
-
-	if (net == &init_net)
-		net->ns.inum = PROC_NET_INIT_INO;
-	else
-		ret = proc_alloc_inum(&to_ns_common(net)->inum);
-	if (ret)
-		return ret;
-
 	net_ns_net_debugfs(net);
 	return 0;
 }
 
-static __net_exit void net_ns_net_exit(struct net *net)
-{
-	/*
-	 * Initial network namespace doesn't exit so we don't need any
-	 * special checks here.
-	 */
-	ns_free_inum(&net->ns);
-}
-
 static struct pernet_operations __net_initdata net_ns_ops = {
 	.init = net_ns_net_init,
-	.exit = net_ns_net_exit,
 };
 
 static const struct nla_policy rtnl_net_policy[NETNSA_MAX + 1] = {

-- 
2.47.3