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[82.53.134.58]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-483bd68826asm9484475e9.0.2026.02.24.07.10.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 24 Feb 2026 07:10:51 -0800 (PST) Date: Tue, 24 Feb 2026 16:10:49 +0100 From: Stefano Garzarella To: Bobby Eshleman Cc: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Stefan Hajnoczi , Shuah Khan , Bobby Eshleman , "Michael S. Tsirkin" , Jonathan Corbet , Shuah Khan , virtualization@lists.linux.dev, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-doc@vger.kernel.org, kuniyu@google.com, ncardwell@google.com Subject: Re: [PATCH net v3 3/3] vsock: document write-once behavior of the child_ns_mode sysctl Message-ID: References: <20260223-vsock-ns-write-once-v3-0-c0cde6959923@meta.com> <20260223-vsock-ns-write-once-v3-3-c0cde6959923@meta.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline In-Reply-To: <20260223-vsock-ns-write-once-v3-3-c0cde6959923@meta.com> On Mon, Feb 23, 2026 at 02:38:34PM -0800, Bobby Eshleman wrote: >From: Bobby Eshleman > >Update the vsock child_ns_mode documentation to include the new >write-once semantics of setting child_ns_mode. The semantics are >implemented in a preceding patch in this series. > >Signed-off-by: Bobby Eshleman >--- >Changes in v3: >- update language to clarify language that first value is locked, but subsequent > writes succeed. >--- > Documentation/admin-guide/sysctl/net.rst | 3 +++ > 1 file changed, 3 insertions(+) Reviewed-by: Stefano Garzarella > >diff --git a/Documentation/admin-guide/sysctl/net.rst b/Documentation/admin-guide/sysctl/net.rst >index c10530624f1e..3b2ad61995d4 100644 >--- a/Documentation/admin-guide/sysctl/net.rst >+++ b/Documentation/admin-guide/sysctl/net.rst >@@ -594,6 +594,9 @@ Values: > their sockets will only be able to connect within their own > namespace. > >+The first write to ``child_ns_mode`` locks its value. Subsequent writes of the >+same value succeed, but writing a different value returns ``-EBUSY``. >+ > Changing ``child_ns_mode`` only affects namespaces created after the change; > it does not modify the current namespace or any existing children. > > >-- >2.47.3 >