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[100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 5E3A040C35; Wed, 21 Jan 2026 12:30:01 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E47A9C116D0; Wed, 21 Jan 2026 12:29:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1768998601; bh=qe7hU0xGsnAGodvdUT9CNao+ZWoECfunKCWawAqpg/Q=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=q9uoWd/mZkwY9bMKMRhLR6mrPvEq7golmPJri1qLVFxU7FgLbKwKjMh8KCVbS6vVh Sw+5u3+yN5GOs9jmEFKuOaZvtKszzfHvb+JSRJR+jf5bgYbaajUfqnIcVXPd4c5WpJ ZUnXyyq+sahNOTDp3HtrS1nPGlaFcL/9Wb6qX1fMk91QZrqHzbTe8WtY781KLi68/j KCIQ6XPkD3D1ZdLLE5XCUFZ+dguCZvRWJBXnxLHo4KuxUds6kpTLtZSOP6PcP6KvJb MmYA7JHgNa98Dh52swCV6GpFM09Ir/pZEQWLR43Go1/Jz4erVVxR4IY3Qh6j8YmkuI 0XqHz72/SLhZw== Message-ID: Subject: Re: [PATCH v2 01/31] Documentation: document EXPORT_OP_NOLOCKS From: Jeff Layton To: NeilBrown Cc: Christoph Hellwig , Christian Brauner , Alexander Viro , Chuck Lever , 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: Wed, 21 Jan 2026 07:29:52 -0500 In-Reply-To: <176898948697.16766.1729756714812778707@noble.neil.brown.name> 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> , <2ed97731c54ef130ea58861a91c80dacd785de9a.camel@kernel.org> <176898948697.16766.1729756714812778707@noble.neil.brown.name> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; 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S7jKpWmO8iFb2UKLn1LNO5nPBf0pS7zDMCswET174i/nm759zxk0RGT+sw1Z85rQ5RRlRvEbkTrJnDyySd7I6QlBmt9r5Pc4eP0fNKHVQA4E/Y3V9xfQ44SWiwEXiLu+sFYt+u79yeS0zPndemU3I38xZaI5NKrPd0ddRutEAv5RqM4SoR+VYPMktyppc4sm5DVa62OX9BBtlafFKVCZ4v46PjIGWVK+ba+KvPddrZe8dgtaciQqB5DrLGeA9AFtIywmyTFyA1inNW7WVBtbAYoifqkXlKIpLHPKDf44QEF2phyvThAQkfn+RJ7m5iHm1kGhtKU4d1TxvM3coj/WnYzMt3A1wMmPxGMfkO3aWHV8p1Cg= 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 Wed, 2026-01-21 at 20:58 +1100, NeilBrown wrote: > On Wed, 21 Jan 2026, Jeff Layton wrote: > > 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.= Some > > > > > > + filesystems cannot properly support file locking as implem= ented by > > > > > > + nfsd. A case in point is reexport of NFS itself, which can= 't be done > > > > > > + safely without coordinating the grace period handling. Oth= er clustered > > > > > > + and networked filesystems can be problematic here as well. > > > > >=20 > > > > > I'm not sure this is very useful. It really needs to document wh= at > > > > > locking semantics nfs expects, because otherwise no reader will k= now > > > > > 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. Files= ystems > > > + that want to support locking over NFS must support POSIX file lo= cking > > > + semantics and must handle lock recovery requests from clients af= ter a > > > + reboot. Most local disk, RAM, or pseudo-filesystems use the gene= ric POSIX > > > + locking support in the kernel and naturally provide this capabil= ity. Network > > > + or clustered filesystems usually need special handling to do thi= s properly. > >=20 > > Even better, I think? > >=20 > > + > > + EXPORT_OP_NOLOCKS - Disable file locking on this filesystem. Filesys= tems > > + that want to support locking over NFS must support POSIX file lock= ing > > + semantics. When the server reboots, the clients will issue request= s to > > + recover their locks, which nfsd will issue to the filesystem as ne= w lock > > + requests. Those must succeed in order for lock recovery to work. M= ost > > + local disk, RAM, or pseudo-filesystems use the generic POSIX locki= ng > > + support in the kernel and naturally provide this capability. Netwo= rk or > > + clustered filesystems usually need special handling to do this pro= perly. > > + Set this flag on filesystems that can't guarantee the proper seman= tics > > + (e.g. reexported NFS). >=20 > I think this is quite thorough, which it good ... maybe too good :-) It > reminds me that for true NFS compatibility the fs shouldn't allow local > locks (or file opens!) until the grace period has passed. I don't think > any local filesystems enforce that - it would have to be locks.c that > does I expect. I doubt there would be much appetite for doing that > though. >=20 Yeah, I don't see us ever doing that. It'd be a tricky chicken-and-egg problem, given the demand-driven way that the mountd upcalls work today. We don't even know that anything is exported until something asks for it. > Reviewed-by: NeilBrown >=20 Thanks! --=20 Jeff Layton