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with ESMTP id 7CDCD60008; Tue, 20 Jan 2026 14:12:32 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8828BC19423; Tue, 20 Jan 2026 14:12:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1768918352; bh=L3E8HhvX87nmou45QKTRtBfQlfrNc6JUH9rmuLWAoZs=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=fs1qjXLdXmYtCaveOISFME6KjBkKjb93SreqPvM/VXpZtTME7TbUDB7pUY5qsJkw5 6fuwZGlF1NrNjUlEizRekYSqjMOnShYqpAOqWfJeliIvBrtsjTVxHaNyG+pZCZQ4e2 PlodS/y5xq+O9DKI2i6VKaSJh8YCqvmmXitGD1ToLYIRPwjB1OGytE3TKa6A7LbuzD +5fhNRH0iB3jJX4TstKRcDUCIflQg2FmOVfqdnQaKtnh7Pj2nNfi+rahiAmH5n7j6Y Wc5bt8uWgo78VkXwAi0MoR7eV4eRdIq8Ss/wjOXSmrZlF1nZmPlWL1481755bZUcy3 ytNjAkJhyTlvA== Message-ID: <707f08e114bf603caf7de020bb630d5477e86bca.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 09:12:24 -0500 In-Reply-To: <9b64bed72e43d0bf24e9b1e3bc770c4a87082762.camel@kernel.org> References: <20260119-exportfs-nfsd-v2-0-d93368f903bd@kernel.org> <20260119-exportfs-nfsd-v2-1-d93368f903bd@kernel.org> <9b64bed72e43d0bf24e9b1e3bc770c4a87082762.camel@kernel.org> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV 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UTp3Wbcrt30hjBOIjKijK8EiBK+QpSIpKHYgQ4J/lesIMVbZA+GK22maacqg9V4ubOil3tr8oG+kMbHEBUBxFcEOL1ipNjgzMDVtjXDL/yJzmLloZCzd4DBSH11ZeeJu5XumpcxVsDiWnVzvuo+ncyctyHS7RUxceNp+XfZj6YYt2XAOcXMuHyPnR7GVftLdStpdvDjuwS/VnsK00i5xvR58MddzqpcN8GMm/ft4bI7UjtFbjH3vsE0clHKM8ACRP/3BDUP/LF46OQXkQ+nvfW9/iUIB8l6ejSpVuIGHScqfPnZRc5OqJsMdZl1RDw5DAy1DEVJPnz6jwLuzjwgYM/3mwVoShUQmrpQAYH3MU+j4xqZ4= 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 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 implemented = by > > > + nfsd. A case in point is reexport of NFS itself, which can't be = done > > > + safely without coordinating the grace period handling. Other clu= stered > > > + 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. How about this? + EXPORT_OP_NOLOCKS - Disable file locking on this filesystem. Filesystems + that want to support locking over NFS must support POSIX file locking + semantics and must handle lock recovery requests from clients after a + reboot. Most local disk, RAM, or pseudo-filesystems use the generic PO= SIX + locking support in the kernel and naturally provide this capability. N= etwork + or clustered filesystems usually need special handling to do this prop= erly. --=20 Jeff Layton