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[71.191.243.150]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-8ae6cb9ea1csm13877066d6.28.2026.04.15.06.34.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 15 Apr 2026 06:34:59 -0700 (PDT) Date: Wed, 15 Apr 2026 09:34:56 -0400 From: Gregory Price To: "David Hildenbrand (Arm)" Cc: "Darrick J. Wong" , John Groves , Miklos Szeredi , Joanne Koong , Bernd Schubert , John Groves , Dan Williams , Bernd Schubert , Alison Schofield , John Groves , Jonathan Corbet , Shuah Khan , Vishal Verma , Dave Jiang , Matthew Wilcox , Jan Kara , Alexander Viro , Christian Brauner , Randy Dunlap , Jeff Layton , Amir Goldstein , Jonathan Cameron , Stefan Hajnoczi , Josef Bacik , Bagas Sanjaya , Chen Linxuan , James Morse , Fuad Tabba , Sean Christopherson , Shivank Garg , Ackerley Tng , Aravind Ramesh , Ajay Joshi , "venkataravis@micron.com" , "linux-doc@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "nvdimm@lists.linux.dev" , "linux-cxl@vger.kernel.org" , "linux-fsdevel@vger.kernel.org" , djbw@kernel.org Subject: Re: [PATCH V10 00/10] famfs: port into fuse Message-ID: References: <38744253-efa3-41c5-a491-b177a4a4c835@bsbernd.com> <20260414185740.GA604658@frogsfrogsfrogs> Precedence: bulk X-Mailing-List: nvdimm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Wed, Apr 15, 2026 at 10:16:38AM +0200, David Hildenbrand (Arm) wrote: > On 4/15/26 00:20, Gregory Price wrote: > > On Tue, Apr 14, 2026 at 11:57:40AM -0700, Darrick J. Wong wrote: > >>> > >>> I very strongly object to making this a prerequisite to merging. This > >>> is an untested idea that will certainly delay us by at least a couple > >>> of merge windows when products are shipping now, and the existing approach > >>> has been in circulation for a long time. It is TOO LATE!!!!!! > >> > > ... > >> > >> That said, you're clearly pissed at the goalposts changing yet again, > >> and that's really not fair that we collectively keep moving them. > >> > > > > This seems a bit more than moving a goalpost. > > > > We're now gating working software, for real working hardware, on a novel, > > unproven BPF ops structure that controls page table mappings on page table > > faults which would be used by exactly 1 user : FAMFS. > > Are MM people on board with even letting BPF do that? Honest question, > if someone has a pointer to how that should work, that would be appreciated. > This was my first reaction when I realized the BPF program would be controlling iomap return value in the fault path. Big ol' (!) popped up over my head. ~Gregory