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Mon, 2 Aug 2021 20:32:48 +0000 Subject: Re: A Third perspective on BTRFS nfsd subvol dev/inode number issues. To: "J. Bruce Fields" , NeilBrown Cc: Miklos Szeredi , Al Viro , Christoph Hellwig , Josef Bacik , Chuck Lever , Chris Mason , David Sterba , linux-fsdevel@vger.kernel.org, Linux NFS list , Btrfs BTRFS References: <162742539595.32498.13687924366155737575.stgit@noble.brown> <162742546548.32498.10889023150565429936.stgit@noble.brown> <162762290067.21659.4783063641244045179@noble.neil.brown.name> <162762562934.21659.18227858730706293633@noble.neil.brown.name> <162763043341.21659.15645923585962859662@noble.neil.brown.name> <162787790940.32159.14588617595952736785@noble.neil.brown.name> <20210802123930.GA6890@fieldses.org> From: Patrick Goetz Message-ID: <47101630-9d59-5818-34dd-3755e101fc18@math.utexas.edu> Date: Mon, 2 Aug 2021 15:32:45 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.12.0 In-Reply-To: <20210802123930.GA6890@fieldses.org> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-ClientProxiedBy: SN7PR04CA0002.namprd04.prod.outlook.com (2603:10b6:806:f2::7) To BYAPR06MB3848.namprd06.prod.outlook.com (2603:10b6:a02:8c::15) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from [192.168.1.4] (67.198.113.142) by SN7PR04CA0002.namprd04.prod.outlook.com (2603:10b6:806:f2::7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4373.17 via Frontend Transport; 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Bruce Fields wrote: > On Mon, Aug 02, 2021 at 02:18:29PM +1000, NeilBrown wrote: >> For btrfs, the "location" is root.objectid ++ file.objectid. I think >> the inode should become (file.objectid ^ swab64(root.objectid)). This >> will provide numbers that are unique until you get very large subvols, >> and very many subvols. > > If you snapshot a filesystem, I'd expect, at least by default, that > inodes in the snapshot to stay the same as in the snapshotted > filesystem. > > --b. > For copy on right systems like ZFS, how could it be otherwise?