From nobody Thu Sep 11 01:49:16 2025 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 22C3932C33B; Wed, 10 Sep 2025 14:39:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757515170; cv=none; b=UzkpgAtrKx72dxPecmeFc+7ZSHxQv+Mr9SY0AGl1pdpk5EjuSeShkjsWrxQURB/euU2O5obOdhiUzcYH26CUw9O2g5ugvBuhsi3t7kXp/2ve/SONM2MPOGnDE12p7uZmPUDAqPX/sy05vz965Zkbo1deXurJA1NNr/SrytzHBik= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757515170; c=relaxed/simple; bh=P3IhXUPNps89Uph+zReDw5Ax8vIvkOOMRZK7+M5sDUk=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=BFGYlHGQ+cvct3/R+1rWWX6HCwnqzkorrYPHUSIUG2UdjV8xLOafzsLMsET9if2OhmxN+y00ehm5Je4GP5XYN3iHrbtHNX3kKe/aQ/cg737rLN3B4hFfz7oAIt5xyClJgWXv8Ak0jZoHwxjEYnEuSXzvhYzmEzjxQ0Q9tjT51Rc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=BNpamWZu; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="BNpamWZu" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2125AC4CEEB; Wed, 10 Sep 2025 14:39:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1757515169; bh=P3IhXUPNps89Uph+zReDw5Ax8vIvkOOMRZK7+M5sDUk=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=BNpamWZu3dbeqglrQf1JNLGdbWHgewpInbIniGQuH9tmBft7dNqMLJ1A99X9o1Rc/ verH5pMX3btqjmLVJ2lXhp6c0ndO0KwiSRXq+/3Ywv8MO/hZSmrHA44Dptuh8K/XJm abkeP6t4KovU7hvXq1DqvI5q2t3kWAw1ekqXdRSunMeMGw6AzVnEYRG54OZP2Q3jjt 41Ypd1tfF8Y+rQWwKGNpAQv37pI9tIe/cXDv5SWiKsqcndNbR3F4Q3Oqf/dHcP9uKu IUu+ml0+mGzDyZF1TKMRSr7OK0gVGZwAvEq4XFTMUv31ey8rD7zdC7mV5JyCtd7qgl M5m6xW9y4yOlg== From: Christian Brauner Date: Wed, 10 Sep 2025 16:37:09 +0200 Subject: [PATCH 24/32] uts: support iterator Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250910-work-namespace-v1-24-4dd56e7359d8@kernel.org> References: <20250910-work-namespace-v1-0-4dd56e7359d8@kernel.org> In-Reply-To: <20250910-work-namespace-v1-0-4dd56e7359d8@kernel.org> To: Jan Kara , Amir Goldstein , linux-fsdevel@vger.kernel.org Cc: Josef Bacik , Jeff Layton , Mike Yuan , =?utf-8?q?Zbigniew_J=C4=99drzejewski-Szmek?= , Lennart Poettering , Daan De Meyer , Aleksa Sarai , Alexander Viro , Jens Axboe , Tejun Heo , Johannes Weiner , =?utf-8?q?Michal_Koutn=C3=BD?= , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Chuck Lever , linux-nfs@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, netdev@vger.kernel.org, Christian Brauner X-Mailer: b4 0.14.3-dev-385fa X-Developer-Signature: v=1; a=openpgp-sha256; l=1533; i=brauner@kernel.org; h=from:subject:message-id; bh=P3IhXUPNps89Uph+zReDw5Ax8vIvkOOMRZK7+M5sDUk=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMWQc7OWM+JV0QFFvN0P7nLgZWmtOTuu8ySX7/53Z/czC0 MJ/VrtKO0pZGMS4GGTFFFkc2k3C5ZbzVGw2ytSAmcPKBDKEgYtTACYS4M3I0FtivvSHmPUnzqsf Tt05c7Zb3a12Q/WOp2JSH7cslmOzM2X4n2el0y/bfiaCOSDdtfXxjhzVlMC1e3z2mdv7Ttj7dsM aJgA= X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 Support the generic namespace iterator and lookup infrastructure to support file handles for namespaces. Signed-off-by: Christian Brauner --- kernel/utsname.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/kernel/utsname.c b/kernel/utsname.c index 02037010b378..64155417ae0c 100644 --- a/kernel/utsname.c +++ b/kernel/utsname.c @@ -13,6 +13,7 @@ #include #include #include +#include #include =20 static struct kmem_cache *uts_ns_cache __ro_after_init; @@ -58,6 +59,7 @@ static struct uts_namespace *clone_uts_ns(struct user_nam= espace *user_ns, memcpy(&ns->name, &old_ns->name, sizeof(ns->name)); ns->user_ns =3D get_user_ns(user_ns); up_read(&uts_sem); + ns_tree_add(ns); return ns; =20 fail_free: @@ -93,10 +95,12 @@ struct uts_namespace *copy_utsname(unsigned long flags, =20 void free_uts_ns(struct uts_namespace *ns) { + ns_tree_remove(ns); dec_uts_namespaces(ns->ucounts); put_user_ns(ns->user_ns); ns_free_inum(&ns->ns); - kmem_cache_free(uts_ns_cache, ns); + /* Concurrent nstree traversal depends on a grace period. */ + kfree_rcu(ns, ns.ns_rcu); } =20 static inline struct uts_namespace *to_uts_ns(struct ns_common *ns) @@ -162,4 +166,5 @@ void __init uts_ns_init(void) offsetof(struct uts_namespace, name), sizeof_field(struct uts_namespace, name), NULL); + ns_tree_add(&init_uts_ns); } --=20 2.47.3