From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 858B741B348; Tue, 20 Jan 2026 13:20:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768915214; cv=none; b=Eh/AjaLNnT+6zQT3mhPW9cIweb+ulVyWzNzCeFBedMEc5sTujVs6f/2OY441cD4D4Ocm0EesXo59kV7pTXx7Wm6KHwQi2RL+J07YIrY/6SB8Srx0PAwuM8gmi/giP5qGs4KV/3YOTnzzNuOv1qfXN8YFQ4BBargla8e8Vd+r5gg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768915214; c=relaxed/simple; bh=2q4hi60bazvcilbJNiRaJ1JXOg/rrf7FitaJTcVDTb8=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=WAe0IaTOevkhvmCCPGLG7Zgc4iTQNvh1wf6w1FcWjQnRbxSY2SH/Ei/mzZKiOPwXHEP2/HOv/cs2xZ1OK6efEUogShJoxMIQzzcVNI3IQVeIbcep14FXR/Nv0xe9ZG93fcRrDollV7sSFSsWPDYokcW4KbZEOdSeNje4ojfRW1k= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=BtzWd0dX; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="BtzWd0dX" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 672F2C16AAE; Tue, 20 Jan 2026 13:20:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1768915214; bh=2q4hi60bazvcilbJNiRaJ1JXOg/rrf7FitaJTcVDTb8=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=BtzWd0dX8xBjfl+Rd+agDtCA43l7AAkFA/UsKIDl9a7o4TBkTAytTBAuUr0Qyuh75 2N7fm3ZAHeK0SWNrzZRWqfSRMDMMqT3mpkwnv7lmITCL2CwjeO/xepTD7gyE7YHLl2 gM+m3vW5GHY1o82g5ze5dgIN3bLPNkibscKkg0isZRuq/GGlvGiuzt3eWvg3a5Pl2D 7Xay7ZOUmajqckfhjbuheztwcouRty0bEYtF4WcXwaAwtOWOwNnr8WWChOTQqMKgHX B428QQ2/IOEF+hZbWNjI/5dC68aGe6BBGOTCHedvnLkRZD6kmneMW0MiewKug88TR0 XdKyqpB0lgjYQ== Message-ID: <9b64bed72e43d0bf24e9b1e3bc770c4a87082762.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 08:20:06 -0500 In-Reply-To: References: <20260119-exportfs-nfsd-v2-0-d93368f903bd@kernel.org> <20260119-exportfs-nfsd-v2-1-d93368f903bd@kernel.org> Autocrypt: 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text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.58.2 (3.58.2-1.fc43) Precedence: bulk X-Mailing-List: linux-unionfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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 do= ne > > + safely without coordinating the grace period handling. Other clust= ered > > + 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. Fair point. I'll see if I can draft something better. Suggestions welcome. --=20 Jeff Layton