From nobody Thu Oct 2 19:24:09 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 BCDCD305E1B; Fri, 12 Sep 2025 11:54:50 +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=1757678090; cv=none; b=o1mJ8wDmnmCjIDriXrtdGbIbi6jYOE39EInXK9mybzjpiLx3PQ11H4mk01jo8XnlZWeWaiLZ1GftOl5RGihE8PhQ/dwjcZag+2rr9ttTXZ+rdh9jO2qUDR+n6yWn9d0tlFjhQy37137sAoM5WyISSPYQpyjwz7pq4ZTp2UpolKk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757678090; c=relaxed/simple; bh=zXzswUxucAZ3erAopYaaLksXgDoG/F+VNyIyuNZ/PzY=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=PKowkvThN1S8B/Tr8+KUildGgepraQ1KAvoRXUmNcEv9rXNwFwIAzOVGXY434/nCNBBZ5cNh1mJRdQhCbRWrGaQgvvh49meHCTClL4ZL9c7kAXZuBzGkJJjzM22b1sWA3CyiuV8LcHwUUActMUAJHZUhGQNLTlbkuZVvoH1IKuE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=WEL9gfAr; 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="WEL9gfAr" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 28C88C4CEFB; Fri, 12 Sep 2025 11:54:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1757678090; bh=zXzswUxucAZ3erAopYaaLksXgDoG/F+VNyIyuNZ/PzY=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=WEL9gfArHvVkhsly6oAcu9lfW+/Ekmnt4Z43f9JIz8gxVOuMUUssnExgVW8pn3PNC bEyFsBCkD7Q/6fYd3g3KAqmIxxJ4L32XLD9uSSEgt/IAPD4R4dVm5uQSA78+5v7g2O 5lbOTNUanEzK1WRtMmq26OEwavhT+hhQkejLNFrkTBAAwMRcY4tfkV6sB8moBSWxgW vH0sf2Qo7oZOYJrptNZD0OB9Dn8osxFCR38XxjkAy7nSOpYY0CZs/5YNEOTo83VQHc 6UuGZl457+Fzusuwi5jDeO1r57mlEITSxVZSXGNbVLcWoqNmUGUQm/N/qVZN2hkDbg HgcWqAVykmNRw== From: Christian Brauner Date: Fri, 12 Sep 2025 13:52:42 +0200 Subject: [PATCH v2 19/33] cgroup: support ns lookup 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: <20250912-work-namespace-v2-19-1a247645cef5@kernel.org> References: <20250912-work-namespace-v2-0-1a247645cef5@kernel.org> In-Reply-To: <20250912-work-namespace-v2-0-1a247645cef5@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=1788; i=brauner@kernel.org; h=from:subject:message-id; bh=zXzswUxucAZ3erAopYaaLksXgDoG/F+VNyIyuNZ/PzY=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMWQc4ZzqsLrsz4+ZpzzWSyWb6O+vbehprV6wIjny7WZ5q 6444/uiHaUsDGJcDLJiiiwO7Sbhcst5KjYbZWrAzGFlAhnCwMUpABOpqGT473jASWN2ecX50zuT mjes1P50wEtPTc/p8EPHzy8eh2/dw83IsPHuuleSRQlKj8WLOR6of7QM8uut3lLd5Oqzp/DEIo5 wFgA= X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 Support the generic ns lookup infrastructure to support file handles for namespaces. Acked-by: Tejun Heo Signed-off-by: Christian Brauner Reviewed-by: Jan Kara --- kernel/cgroup/cgroup.c | 2 ++ kernel/cgroup/namespace.c | 7 +++++-- 2 files changed, 7 insertions(+), 2 deletions(-) diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c index 312c6a8b55bb..092e6bf081ed 100644 --- a/kernel/cgroup/cgroup.c +++ b/kernel/cgroup/cgroup.c @@ -59,6 +59,7 @@ #include #include #include +#include #include =20 #define CREATE_TRACE_POINTS @@ -6312,6 +6313,7 @@ int __init cgroup_init(void) WARN_ON(register_filesystem(&cpuset_fs_type)); #endif =20 + ns_tree_add(&init_cgroup_ns); return 0; } =20 diff --git a/kernel/cgroup/namespace.c b/kernel/cgroup/namespace.c index 0391b6ab0bf1..fc12c416dfeb 100644 --- a/kernel/cgroup/namespace.c +++ b/kernel/cgroup/namespace.c @@ -5,7 +5,7 @@ #include #include #include - +#include =20 /* cgroup namespaces */ =20 @@ -30,16 +30,19 @@ static struct cgroup_namespace *alloc_cgroup_ns(void) ret =3D ns_common_init(&new_ns->ns, &cgroupns_operations, true); if (ret) return ERR_PTR(ret); + ns_tree_add(new_ns); return no_free_ptr(new_ns); } =20 void free_cgroup_ns(struct cgroup_namespace *ns) { + ns_tree_remove(ns); put_css_set(ns->root_cset); dec_cgroup_namespaces(ns->ucounts); put_user_ns(ns->user_ns); ns_free_inum(&ns->ns); - kfree(ns); + /* Concurrent nstree traversal depends on a grace period. */ + kfree_rcu(ns, ns.ns_rcu); } EXPORT_SYMBOL(free_cgroup_ns); =20 --=20 2.47.3