From mboxrd@z Thu Jan 1 00:00:00 1970 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 50DD382487 for ; Mon, 15 Apr 2024 17:43:38 +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=1713203019; cv=none; b=hMz/9lJlmJP9vV7n/e+iunJ2PiY5vg7gIfUC+ykeIpx/JFcbnYOMuZmsRYdPXUovLXxrq3uGhfW4KbM0I+lnKZ8fCTUS/AqeP3aEv4OB6s6BzSm1dIDlplcNg8A0XmsN1skqwl5yD96szeX8Az8oKLgRWU1XcpnGylPT78zQF08= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713203019; c=relaxed/simple; bh=wasWUyBb9ePJon5OSBlcanWhgLFuriFM+WFBxP6ODN8=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=fUV/oTKdIXdk/A8glOPNdZv2+NGDCBpHc/GCsrx2xp5GR/oYmUS77S1PKefmWCqq61E/zCm/5GL+hNXGQkpiMT16L17QakH0YJLynsHI7DPwSQcPnxukDN536iJj9QooU/bVehnuH77KYmeZ0YxIWnu70jY7621bRW8lIA/RcM8= 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/p3U9ro; 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="j/p3U9ro" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 43D14C113CC; Mon, 15 Apr 2024 17:43:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1713203018; bh=wasWUyBb9ePJon5OSBlcanWhgLFuriFM+WFBxP6ODN8=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=j/p3U9ro3qv35L/5GEbTnCN0szCVyiD/JwdhwpjmR3XfmiunP9Q3dhblg4/yqkRrB 0+hiLDyzVn5zxv90eHZAbi4TKSDTKrS30OSqmfSk/aLNabst6fRZrtV7QkgLdeM8eO JRCnzaS4icT+GqsoBE3bSUHph2247jIc1XltnOYn2wFm944mifdbUuTjuPfo2PNVLE N1PS/O2IrHQZt+I73BOpwkacLOtGk6DTr/H021XStfNIdtkp4JvVWgCjp0xZCT/MaG 2OSWAgiPCt5ffcxOYy9fOtwcSxu/aqZ3jH7ZDllNgwMAfn9R6l5y5z3Rx0XiFxsqLR 2zXZKy48fmlFw== Message-ID: <5052616ca4c2789ffcc51a27cbff060e2fbdb7b4.camel@kernel.org> Subject: Re: [PATCH 1/1] proc01: Whitelist /proc/fs/nfsd/nfsv4recoverydir From: Jeff Layton To: Chuck Lever III Cc: Petr Vorel , "ltp@lists.linux.it" , Neil Brown , Cyril Hrubis , Linux NFS Mailing List Date: Mon, 15 Apr 2024 13:43:37 -0400 In-Reply-To: <6820832A-9F38-4DE7-8EE4-7AAC8CF06FD4@oracle.com> References: <20240415172133.553441-1-pvorel@suse.cz> <7A48C70E-BAAB-4A1C-A41B-ABC30287D8B7@oracle.com> <6820832A-9F38-4DE7-8EE4-7AAC8CF06FD4@oracle.com> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; 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QiErRVPpB7VzA/pYV5Mdy7GMbPjmO0IpoL0tVZ8JvUzUZXB3ErS/dJflvboAAQeLpLCkQjqZiQ/DCmgJCrBJst9Xc7YsKKS379Tc3GU33HNSpaOxs2NwfzoesyjKU+P35czvXWTtj7KVVSj3SgzzFk+gLx8y2Nvt9iESdZ1Ustv8tipDsGcvIZ43MQwqU9YbLg8k4V9ch+Mo8SE+C0jyZYDCE2ZGf3OztvtSYMsTnF6/luzVyej1AFVYjKHORzNoTwdHUeC+9/07GO0bMYTPXYvJ/vxBFm3oniXyhgb5FtABEBAAGJAh8EGAECAAkFAk6V0TwCGwwACgkQAA5oQRlWghXhZRAAyycZ2DDyXh2bMYvI8uHgCbeXfL3QCvcw2XoZTH2l2umPiTzrCsDJhgwZfG9BDyOHaYhPasd5qgrUBtjjUiNKjVM+Cx1DnieR0dZWafnqGv682avPblfi70XXr2juRE/fSZoZkyZhm+nsLuIcXTnzY4D572JGrpRMTpNpGmitBdh1l/9O7Fb64uLOtA5Qj5jcHHOjL0DZpjmFWYKlSAHmURHrE8M0qRryQXvlhoQxlJR4nvQrjOPMsqWD5F9mcRyowOzr8amasLv43w92rD2nHoBK6rbFE/qC7AAjABEsZq8+TQmueN0maIXUQu7TBzejsEbV0i29z+kkrjU2NmK5pcxgAtehVxpZJ14LqmN6E0suTtzjNT1eMoqOPrMSx+6vOCIuvJ/MVYnQgHhjtPPnU86mebTY5Loy9YfJAC2EVpxtcCbx2KiwErTndEyWL+GL53LuScUD7tW8vYbGIp4RlnUgPLbqpgssq2gwYO9m75FGuKuB2+2bCGajqalid5nzeq9v7cYLLRgArJfOIBWZrHy2m0C+pFu9DSuV6SNr2dvMQUv1V58h0FaSOxHVQnJdnoHn13g/CKKvyg2EMrMt/EfcXgvDwQbnG9we4xJiWOIOcsvrWcB6C6lWBDA+In7w7SXnnok kZWuOsJdJQdmwlWC5L5ln9xgfr/4mOY38B0U= Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.4 (3.50.4-1.fc39) Precedence: bulk X-Mailing-List: linux-nfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Mon, 2024-04-15 at 17:37 +0000, Chuck Lever III wrote: >=20 > > On Apr 15, 2024, at 1:35=E2=80=AFPM, Jeff Layton w= rote: > >=20 > > On Mon, 2024-04-15 at 17:27 +0000, Chuck Lever III wrote: > > >=20 > > > > On Apr 15, 2024, at 1:21=E2=80=AFPM, Petr Vorel wr= ote: > > > >=20 > > > > /proc/fs/nfsd/nfsv4recoverydir started from kernel 6.8 report EINVA= L. > > > >=20 > > > > Signed-off-by: Petr Vorel > > > > --- > > > > Hi, > > > >=20 > > > > @ Jeff, Chuck, Neil, NFS devs: The patch itself whitelist reading > > > > /proc/fs/nfsd/nfsv4recoverydir in LTP test. I suspect reading faile= d > > > > with EINVAL in 6.8 was a deliberate change and expected behavior wh= en > > > > CONFIG_NFSD_LEGACY_CLIENT_TRACKING is not set: > > >=20 > > > I'm not sure it was deliberate. This seems like a behavior > > > regression. Jeff? > > >=20 > >=20 > > I don't think I intended to make it return -EINVAL. I guess that's what > > happens when there is no entry for it in the write_op array. > >=20 > > With CONFIG_NFSD_LEGACY_CLIENT_TRACKING disabled, that file has no > > meaning or value at all anymore. Maybe we should just remove the dentry > > altogether when CONFIG_NFSD_LEGACY_CLIENT_TRACKING is disabled? >=20 > My understanding of the rules about modifying this part of > the kernel-user interface is that the file has to stay, even > though it's now a no-op. >=20 Does it? Where are these rules written?=20 What should we have it do now when read and written? Maybe EOPNOTSUPP would be better, if we can make it just return an error? We could also make it just discard written data, and present a blank string when read. What do the rules say we are required to do here? --=20 Jeff Layton From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from picard.linux.it (picard.linux.it [213.254.12.146]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 3DB87C00A94 for ; Mon, 15 Apr 2024 17:44:00 +0000 (UTC) Received: from picard.linux.it (localhost [IPv6:::1]) by picard.linux.it (Postfix) with ESMTP id 1BFF43CFA36 for ; Mon, 15 Apr 2024 19:43:58 +0200 (CEST) Received: from in-6.smtp.seeweb.it (in-6.smtp.seeweb.it [217.194.8.6]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (secp384r1)) (No client certificate requested) by picard.linux.it (Postfix) with ESMTPS id 16BF83CFA26 for ; Mon, 15 Apr 2024 19:43:42 +0200 (CEST) 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bh=wasWUyBb9ePJon5OSBlcanWhgLFuriFM+WFBxP6ODN8=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=j/p3U9ro3qv35L/5GEbTnCN0szCVyiD/JwdhwpjmR3XfmiunP9Q3dhblg4/yqkRrB 0+hiLDyzVn5zxv90eHZAbi4TKSDTKrS30OSqmfSk/aLNabst6fRZrtV7QkgLdeM8eO JRCnzaS4icT+GqsoBE3bSUHph2247jIc1XltnOYn2wFm944mifdbUuTjuPfo2PNVLE N1PS/O2IrHQZt+I73BOpwkacLOtGk6DTr/H021XStfNIdtkp4JvVWgCjp0xZCT/MaG 2OSWAgiPCt5ffcxOYy9fOtwcSxu/aqZ3jH7ZDllNgwMAfn9R6l5y5z3Rx0XiFxsqLR 2zXZKy48fmlFw== Message-ID: <5052616ca4c2789ffcc51a27cbff060e2fbdb7b4.camel@kernel.org> From: Jeff Layton To: Chuck Lever III Date: Mon, 15 Apr 2024 13:43:37 -0400 In-Reply-To: <6820832A-9F38-4DE7-8EE4-7AAC8CF06FD4@oracle.com> References: <20240415172133.553441-1-pvorel@suse.cz> <7A48C70E-BAAB-4A1C-A41B-ABC30287D8B7@oracle.com> <6820832A-9F38-4DE7-8EE4-7AAC8CF06FD4@oracle.com> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; 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