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See http://www.infradead.org/rpr.html X-Headers-End: 1vgInZ-0007Rv-Al Subject: Re: [f2fs-dev] [PATCH 00/24] vfs: require filesystems to explicitly opt-in to lease support X-BeenThere: linux-f2fs-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Latchesar Ionkov , Dave Kleikamp , Alexander Aring , Jan Kara , Paulo Alcantara , Sandeep Dhavale , Martin Brandenburg , Yuezhang Mo , Anders Larsen , Amir Goldstein , jfs-discussion@lists.sourceforge.net, linux-unionfs@vger.kernel.org, Konstantin Komarov , Chris Mason , Andreas Dilger , Chunhai Guo , Ilya Dryomov , Ronnie Sahlberg , linux-mtd@lists.infradead.org, Mike Marshall , linux-xfs@vger.kernel.org, Xiubo Li , Yue Hu , Miklos Szeredi , samba-technical@lists.samba.org, Richard Weinberger , Mark Fasheh , devel@lists.orangefs.org, Hugh Dickins , "Matthew Wilcox \(Oracle\)" , ntfs3@lists.linux.dev, Christoph Hellwig , Joseph Qi , linux-mm@kvack.org, Viacheslav Dubeyko , linux-btrfs@vger.kernel.org, Gao Xiang , linux-ext4@vger.kernel.org, Salah Triki , Carlos Maiolino , Dominique Martinet , Shyam Prasad N , Christian Schoenebeck , linux-doc@vger.kernel.org, linux-cifs@vger.kernel.org, Tom Talpey , ocfs2-devel@lists.linux.dev, Bharath SM , linux-nilfs@vger.kernel.org, David Sterba , Alexander Viro , Baolin Wang , Jeffle Xu , Jaegeuk Kim , ceph-devel@vger.kernel.org, Eric Van Hensbergen , Ryusuke Konishi , OGAWA Hirofumi , Andreas Gruenbacher , Hans de Goede , gfs2@lists.linux.dev, linux-nfs@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, Theodore Ts'o , Luis de Bethencourt , Nicolas Pitre , linux-erofs@lists.ozlabs.org, v9fs@lists.linux.dev, Jonathan Corbet , Jeff Layton , linux-kernel@vger.kernel.org, Namjae Jeon , Steve French , Chuck Lever , Hongbo Li , Anna Schumaker , Jan Kara , linux-fsdevel@vger.kernel.org, Phillip Lougher , Andrew Morton , Sungjong Seo , David Woodhouse , Trond Myklebust , Joel Becker Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net On Thu, Jan 15, 2026 at 09:14:06AM +0100, Christian Brauner wrote: > On Wed, Jan 14, 2026 at 10:42:48PM -0800, Christoph Hellwig wrote: > > On Wed, Jan 14, 2026 at 04:20:13PM +0100, Christian Brauner wrote: > > > > You're still think of it the wrong way. If we do have file systems > > > > that break the original exportfs semantics we need to fix that, and > > > > something like a "stable handles" flag will work well for that. But > > > > a totally arbitrary "is exportable" flag is total nonsense. > > > > > > File handles can legitimately be conceptualized independently of > > > exporting a filesystem. If we wanted to tear those concepts apart > > > implementation wise we could. > > > > > > It is complete nonsense to expect the kernel to support exporting any > > > arbitrary internal filesystem or to not support file handles at all. > > > > You are going even further down the path of entirely missing the point > > (or the two points by now). > > You're arguing for the sake of arguing imho. You're getting exactly what > we're all saying as evidenced by the last paragraph in your mail: it is > entirely what this whole thing is about. I can't even parse what you mean. And no, I hate these stupid arguments, and I have much better things to do than dragging this on. > > If a file systems meets all technical requirements of being nfsd > > exportable and the users asks for it, it is not our job to make an > > arbitrary policy decision to say no. > > This is an entirely irrelevant point because we're talking about > cgroupfs, nsfs, and pidfs. And they don't meet this criteria. cgroupfs > is a _local resource management filesystem_ why would we ever want to > support exporting it over the network. It allows to break the local > delegation model as I've explained. cgroupfs shows _local processes_. So > a server will see completely nonsensical PID identifiers listed in > cgroup files and it can fsck around with processes in a remote system. None of that is a technical argument. The lack of stable file handles would be one, and I think we came to the conclusion yesterday that this is the case. _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel