From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 71910492E5C; Mon, 21 Sep 2026 16:31:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790008318; cv=none; b=FnTjdHoxnfZxN5dszrZ9h1uZn6MT+jb5Cn/0VbRGdV3WydAkWZSNPq/hoVbEArcDYSmuQQmykaNosybkBhSsvJZJdbhcSx5MWPynrgepTe1Yr6E593uvtrUZWPKAWNI0K1helxWi3d0kjYpz3yIFs3O3w7YvlWj6xLN1RxpmTrQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790008318; c=relaxed/simple; bh=ofYRUACXIOHSiN7om7I6Mv56G8lMIVNgty2jM3XLfQU=; h=From:Subject:Date:Message-Id:MIME-Version:Content-Type:To:Cc; b=hyHNr2xtXtRz1Tx9RSdv/bbFkDihRPmdwN/EfOUTxh/a4Kj3NYgTM2E8DGTkZp/0IYxOJC7H8I+AVKEnwbwOHp0lQH+ROcUvEdlSLDGE/RUDw6m4vnYsk4VgbnlRl/7XlsrnWoQ3eh54/Ing7i7t6VTXvKQajzUNMPeX6DkLtMU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=j/saWYIY; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="j/saWYIY" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 937411F000FF; Mon, 21 Sep 2026 16:31:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1790008317; bh=pAiVDjQnqANbx3607JY0pUpg6KKkPEJMDRzcxM3nW7w=; h=From:Subject:Date:To:Cc; b=j/saWYIYjq5sUJehueZKK7GdoA05qXpCTj2kMexI58tZAI8829f2vYdX5/lM168Yq iOn/ZBRek9YJjv0OY20QHUetwZKsW5jKpOujViODAuDh/WbqKQZOrkEvN8aE4N6k7D LUkFFrCN3XnOCkkHFOT0mPfVtvjnj+dgDrxKrTpxksQHuC9OFT8ZY6ByFWA7XYILrF iKU2vu7QnnQk4JmSVEBbJ0ia/vWtwn4qK20FIp6BGjRHcS/ydbltMd3os++/iQeM5C 5juaQx8gIVhu++A2M3Y9YG8+bKsQ9+Zi0JyMLaXIhhpPiiO5AtaUmNfFloMJC6eKqD wdqKjZNDrz5KA== From: Jeff Layton Subject: [PATCH 0/8] nfsd: reduce the scope of the nfsd_mutex Date: Mon, 21 Sep 2026 12:31:39 -0400 Message-Id: <20260921-nfsd-per-net-mutex-v1-0-4a7287f6504c@kernel.org> 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: 7bit X-B4-Tracking: v=1; b=H4sIAAAAAAAC/x3MQQqAIBBA0avIrBswKdOuEi0ip5pFFmoRSHdPW r7F/xkiBaYIvcgQ6ObIhy+oKwHzNvmVkF0xKKm0tLVBv0SHJwX0lHC/Ej1odNt2urGNnGYo4Rl o4eefDuP7fkWP/h9kAAAA X-Change-ID: 20260918-nfsd-per-net-mutex-8655764940ac To: Chuck Lever , NeilBrown , Olga Kornievskaia , Dai Ngo , Tom Talpey , Shuah Khan Cc: linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, Jeff Layton X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=2585; i=jlayton@kernel.org; h=from:subject:message-id; bh=ofYRUACXIOHSiN7om7I6Mv56G8lMIVNgty2jM3XLfQU=; b=owEBbQKS/ZANAwAKAQAOaEEZVoIVAcsmYgBqsVv2sn0sYvYPH60kiVAUObkBX8v0rf15p6kuk /MJnwqcCBSJAjMEAAEKAB0WIQRLwNeyRHGyoYTq9dMADmhBGVaCFQUCarFb9gAKCRAADmhBGVaC FbC9EACgvHROzNFS6rLD+9j1iW23hBZvcHtAODANSM99p073rBysfBmp15Fs61PwatzA7WtEsqG b/CkaNCcpB7Cz5IDZ1DUEULYGBHO1aVvMsP6r9WMCOgpPJFmtNDO++Hhv0nG1/621g09KKncVGH 2RoWKS0yI905zrt2ZN04lHyySPLsnQhUNiJLh2oXmxMG96vkPsdrQgHb6GJxctA97GnbeheQB2V 4WUPUWNcsdH1fovsqsFT7oSscZ9XV1mqDqZF5zr1BbYxPRIO3W+pHmdJJuk4+HiOLtNm8dZ9NlW mOtfWGq7Anrb7Qlvfbr1oe5N3wBrg4wq6LDiosMNy6pyT6JHWjSRfpGdDKQzfffjzbSwMhGxgyT 8NOBaF70lGXgZOIBlx7YBA5PyVwUfmues7whfSHdFpSVrT13xWzChO78ec3TC2J77FK0YmP6jWF LQPDfEmf37e3LXpl9uJo2te4vpzQVmqJ8pm7LQsJ7EyEdwNuZU8NpTiYqMaUdHaRWi3n/p7Citr um/9QWgzGZ3A+JGAQEkgqDPRzFiKWzJoR0ONGTNZN98b/GbqLNUP3wvuCAMJPR1P2+In8H7egx3 r8mK4ZJktgxeIMRrE6CQ2wh9pL6CyQ5czFld5Y43GStJNjkinDKX/wL3w8lSfIYMPThDYa3xS9H YWTREYNBQ1PdUDg== X-Developer-Key: i=jlayton@kernel.org; a=openpgp; fpr=4BC0D7B24471B2A184EAF5D3000E684119568215 Currently much of nfsd's administration is serialized under the global nfsd_mutex, even though most of the objects managed under it are segregated by net namespace. This patchset does a couple of small cleanups and then adds a new per-net mutex and moves all of the appropriate per-net data structures to be protected by it instead of the global mutex. The filecache is given its own mutex, and the global mutex is renamed and left for managing just the few remaning global objects. I also had an LLM cook up some selftests so we can hopefully keep all of this working properly in the future. Please consider for v7.4. Thanks, Jeff Signed-off-by: Jeff Layton --- Jeff Layton (8): nfsd: clear NFSD_NET_UP before dropping the generic resource reference nfsd: make max_blksize a per-namespace setting nfsd: move the control plane to a per-namespace mutex nfsd: rename nfsd_mutex to nfsd_global_mutex nfsd: give the open file cache its own mutex selftests/nfsd: factor the netlink plumbing into a shared header selftests/nfsd: add cross-namespace isolation tests selftests/nfsd: add a cross-namespace control-plane soak fs/nfsd/export.c | 22 +- fs/nfsd/filecache.c | 36 +- fs/nfsd/netns.h | 16 + fs/nfsd/nfs4proc.c | 4 +- fs/nfsd/nfs4state.c | 8 +- fs/nfsd/nfsctl.c | 129 ++--- fs/nfsd/nfsd.h | 4 +- fs/nfsd/nfssvc.c | 146 ++++-- tools/testing/selftests/nfsd/Makefile | 2 + tools/testing/selftests/nfsd/config | 6 + tools/testing/selftests/nfsd/nfsd_netlink.h | 319 ++++++++++++ .../testing/selftests/nfsd/nfsd_netlink_listener.c | 301 +---------- tools/testing/selftests/nfsd/nfsd_netns_isolation | Bin 0 -> 49192 bytes .../testing/selftests/nfsd/nfsd_netns_isolation.c | 450 ++++++++++++++++ tools/testing/selftests/nfsd/nfsd_netns_stress | Bin 0 -> 39232 bytes tools/testing/selftests/nfsd/nfsd_netns_stress.c | 572 +++++++++++++++++++++ tools/testing/selftests/nfsd/settings | 2 +- 17 files changed, 1580 insertions(+), 437 deletions(-) --- base-commit: aeaddc6a3711283c09a9183068897d4fe1fb464f change-id: 20260918-nfsd-per-net-mutex-8655764940ac Best regards, -- Jeff Layton