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Sun, 25 Apr 2021 20:12:33 +0000 Received: from YQXPR0101MB0968.CANPRD01.PROD.OUTLOOK.COM ([fe80::1c05:585a:132a:f08e]) by YQXPR0101MB0968.CANPRD01.PROD.OUTLOOK.COM ([fe80::1c05:585a:132a:f08e%4]) with mapi id 15.20.4065.026; Sun, 25 Apr 2021 20:12:27 +0000 From: Rick Macklem To: freebsd-stable Subject: NFSv4 issues related to delegations and the back channel Thread-Topic: NFSv4 issues related to delegations and the back channel Thread-Index: AQHXOg2Xi71KFWD6t0GETcndM0IYtg== Date: Sun, 25 Apr 2021 20:12:27 +0000 Message-ID: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 7ed94088-acf9-4cc5-1d9c-08d9082672b8 x-ms-traffictypediagnostic: YQXPR01MB4659: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:9508; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: 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 x-forefront-antispam-report: CIP:255.255.255.255; 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Since use of delegations=0A= requires a working back channel, this mostly affects use of=0A= delegations.=0A= =0A= I now think I have resolved everything and the patches should=0A= be in "main" and then stable/12 and stable/13 in a few weeks.=0A= They should all be in the next FreeBSD12 and FreeBSD 13 releases.=0A= =0A= Until you have a patched NFSv4 client and/or server system, I=0A= am making the following recommendations to avoid trouble:=0A= - Do not use the Linux "nconnects" mount option.=0A= - Do not enable delegations. (This also applies to a patched=0A= NFSv4.1/4.2 server if any of your clients are Linux systems=0A= running a kernel version prior to 5.3.)=0A= - For the NFSv4 server, leave vfs.nfsd.issue_delegations =3D=3D 0.=0A= - For the NFSv4 client, do not run the nfscbd(8) daemon.=0A= =0A= Most of the issues are NFSv4.1/4.2 specific, but some affect=0A= NFSv4.0 as well, so the above recommendations apply to all=0A= NFSv4 versions.=0A= =0A= Fortunately, delegations seldom improve performance,=0A= so following the above recommendations should not be=0A= a big problem.=0A= =0A= rick=0A=