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[100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 7F4094391F; Tue, 20 Jan 2026 14:35:56 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C1E02C16AAE; Tue, 20 Jan 2026 14:35:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1768919756; bh=dpS+PxEHDbPvZHdk4rsi82HgYDznM+Ad7e2Y2GUOqM0=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=c0Yb6FaiYwLqlqQz3OwDA/IDqUxyfXBp9KbKpjmBBfSeVXvxXUbg9q9NdfGgmZWgW LBb/OzfIa5D1/ur6fI8X1Vk7TdmXZKRMcEbjf9JlXnfEB9MYhrugESVBOALo3dfsJN c3kyXsUItLSCJTQSL1vvZL/3HJKK84XphEQiwTOn6YtKVhBnj9QBGOT4f0CwrcGO8u yGALNKq6Knah/9QOmKYxcHJkuuYwydE3ayRFjpzgUGf4tYVBIXe6uQ3AjWXvBoJsWL PgAgzCMENAMM68Vji4VPbqanPmS2G1JSuw16TDRDByd2ZHk+IW8jbpd/hMVDkrbbE8 vt/1AfPD2XjbQ== Message-ID: <2ed97731c54ef130ea58861a91c80dacd785de9a.camel@kernel.org> Subject: Re: [PATCH v2 01/31] Documentation: document EXPORT_OP_NOLOCKS From: Jeff Layton To: Christoph Hellwig Cc: Christian Brauner , Alexander Viro , Chuck Lever , NeilBrown , Olga Kornievskaia , Dai Ngo , Tom Talpey , Amir Goldstein , Hugh Dickins , Baolin Wang , Andrew Morton , Theodore Ts'o , Andreas Dilger , Jan Kara , Gao Xiang , Chao Yu , Yue Hu , Jeffle Xu , Sandeep Dhavale , Hongbo Li , Chunhai Guo , Carlos Maiolino , Ilya Dryomov , Alex Markuze , Viacheslav Dubeyko , Chris Mason , David Sterba , Luis de Bethencourt , Salah Triki , Phillip Lougher , Steve French , Paulo Alcantara , Ronnie Sahlberg , Shyam Prasad N , Bharath SM , Miklos Szeredi , Mike Marshall , Martin Brandenburg , Mark Fasheh , Joel Becker , Joseph Qi , Konstantin Komarov , Ryusuke Konishi , Trond Myklebust , Anna Schumaker , Dave Kleikamp , David Woodhouse , Richard Weinberger , Jan Kara , Andreas Gruenbacher , OGAWA Hirofumi , Jaegeuk Kim , Jonathan Corbet , David Laight , Dave Chinner , linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-ext4@vger.kernel.org, linux-erofs@lists.ozlabs.org, linux-xfs@vger.kernel.org, ceph-devel@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-cifs@vger.kernel.org, samba-technical@lists.samba.org, linux-unionfs@vger.kernel.org, devel@lists.orangefs.org, ocfs2-devel@lists.linux.dev, ntfs3@lists.linux.dev, linux-nilfs@vger.kernel.org, jfs-discussion@lists.sourceforge.net, linux-mtd@lists.infradead.org, gfs2@lists.linux.dev, linux-f2fs-devel@lists.sourceforge.net, linux-doc@vger.kernel.org Date: Tue, 20 Jan 2026 09:35:48 -0500 In-Reply-To: <707f08e114bf603caf7de020bb630d5477e86bca.camel@kernel.org> References: <20260119-exportfs-nfsd-v2-0-d93368f903bd@kernel.org> <20260119-exportfs-nfsd-v2-1-d93368f903bd@kernel.org> <9b64bed72e43d0bf24e9b1e3bc770c4a87082762.camel@kernel.org> <707f08e114bf603caf7de020bb630d5477e86bca.camel@kernel.org> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw 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Evolution 3.58.2 (3.58.2-1.fc43) MIME-Version: 1.0 X-Rspam-User: X-Stat-Signature: o97zciunze91xfhs6atcisu7bsu6uw3b X-Rspamd-Queue-Id: BAB7C16000A X-Rspamd-Server: rspam04 X-HE-Tag: 1768919757-44343 X-HE-Meta: U2FsdGVkX19ZbAA8sknFV7FisN3CSB0hBJ2223XvZsWNxIRHneAe0DRylMnjrBPq1dMT74A0LGExigPrr6gJ5OFH5gxLhTq9h9AGBzXJ+eHzzeEf8wT7LKM01wj2OwE/5/8Ttk4bY/AfmHLjNmtXXYFOo0xG3qzOTS/U2jQ7Lqnnp+90OO3eT01ZGM2yIKgiXSbV46O+dUvx77r8q1eapIQPPjFDQ6iSaFVHxFQav2Xqy2YaQg00NXwfv/STV536bFLzQXIBJUSt1GBxt//pjSg1h5xz1VoTpL4tKG3CdvTWhmatGKJmLrypUundJY8yAwn4AKUdJzPLebEEakfvJVIwUmJ9PzRPm9eM6hMYq4kuOcDhGNwlXYG2SHPFwk+1cJo96rpJk89iPwnQB3zp2Jw+s1XB81hyzG7dwMOQLF7HEA4eqzipLBO4SzcmFr3WigjI9S+mgIR4ugUPXGEmQCzLGDKDrQkvzmHqIyAgC3hCmEOFys47BOIfvlgvyJBnNbORUkPuH81NRfP2ZndOGh7yDxVu4TwENh75IMHsP1UA7BMJe+lBL4mLqyoOjpPlleNQ2WoD/3BVZURZmlTRqMUldGzmitlmm0ZQtkEWKQt+ZUZAV8Gzp/hVEayliOe2X0Y0Gpfian93AeDTiRdSudIN0Wd7rl78V6JGwXj6bJCFZAOaR5LPbCjvMWuxkrbsKG1bWLgIkUVVho8AfABOlg8d9nrQVEXbfw/1dIgdaxlCHdZcB6FMCLoQB/0G92Yes6EmHRdnuM9mfvu3Aa13XRmkJi+XuckrbdyrFm9HHKGCfULeSJKfbQNFZTtY/0bF4CNiu7kVOlKj+OZw0Pp0bMGrPPqVmmBe4RJd9TvpofKRPFnyXJBl+42X68un1yQz9RIMl6G30JoOcgF2DpD0CqwvMBzmTW9o6XLpACNXs6TyJISg7Vu0Gzig08OFKOWa3kM9xlFYtxBwkzDALcj tf12YYwG XTEgngNf3jI7lg7PBukQFU7ZbBemcOyOizH0sp8MOJxatr74= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, 2026-01-20 at 09:12 -0500, Jeff Layton wrote: > On Tue, 2026-01-20 at 08:20 -0500, Jeff Layton wrote: > > On Mon, 2026-01-19 at 23:44 -0800, Christoph Hellwig wrote: > > > On Mon, Jan 19, 2026 at 11:26:18AM -0500, Jeff Layton wrote: > > > > + EXPORT_OP_NOLOCKS - Disable file locking on this filesystem. Som= e > > > > + filesystems cannot properly support file locking as implemente= d by > > > > + nfsd. A case in point is reexport of NFS itself, which can't b= e done > > > > + safely without coordinating the grace period handling. Other c= lustered > > > > + and networked filesystems can be problematic here as well. > > >=20 > > > I'm not sure this is very useful. It really needs to document what > > > locking semantics nfs expects, because otherwise no reader will know > > > if they set this or not. > >=20 > > Fair point. I'll see if I can draft something better. Suggestions > > welcome. >=20 > How about this? >=20 > + EXPORT_OP_NOLOCKS - Disable file locking on this filesystem. Filesyste= ms > + that want to support locking over NFS must support POSIX file lockin= g > + semantics and must handle lock recovery requests from clients after = a > + reboot. Most local disk, RAM, or pseudo-filesystems use the generic = POSIX > + locking support in the kernel and naturally provide this capability.= Network > + or clustered filesystems usually need special handling to do this pr= operly. Even better, I think? + + EXPORT_OP_NOLOCKS - Disable file locking on this filesystem. Filesystems + that want to support locking over NFS must support POSIX file locking + semantics. When the server reboots, the clients will issue requests to + recover their locks, which nfsd will issue to the filesystem as new lo= ck + requests. Those must succeed in order for lock recovery to work. Most + local disk, RAM, or pseudo-filesystems use the generic POSIX locking + support in the kernel and naturally provide this capability. Network o= r + clustered filesystems usually need special handling to do this properl= y. + Set this flag on filesystems that can't guarantee the proper semantics + (e.g. reexported NFS). --=20 Jeff Layton