From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id DD4C8CD37B0 for ; Mon, 18 Sep 2023 20:51:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229770AbjIRUvi (ORCPT ); Mon, 18 Sep 2023 16:51:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35014 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229476AbjIRUvg (ORCPT ); Mon, 18 Sep 2023 16:51:36 -0400 Received: from outgoing.mit.edu (outgoing-auth-1.mit.edu [18.9.28.11]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DCDC8115 for ; Mon, 18 Sep 2023 13:51:30 -0700 (PDT) Received: from letrec.thunk.org (c-73-8-226-230.hsd1.il.comcast.net [73.8.226.230]) (authenticated bits=0) (User authenticated as tytso@ATHENA.MIT.EDU) by outgoing.mit.edu (8.14.7/8.12.4) with ESMTP id 38IKoR5h024636 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 18 Sep 2023 16:50:28 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mit.edu; s=outgoing; t=1695070234; bh=cQvgd+s+SHqIAIQnuNhNw8neTat4lXkBlL5HBzagWhw=; h=Date:From:Subject:Message-ID:MIME-Version:Content-Type; b=k41z9arS2zN/qg83B38PnbJkxk+EoLVGp3+1qnVcboSuxOQAEq8SdflZIh/h8SkiX +frcTcDI1WaGlYpXqGXMdFtBYXBKzMY2Npxvx7xWQitDDaIo4jWT6dTbvLtws9MDiW a7CyhIHWry5XLZWDz9V4yZ4G1W9VWihacrN6c3XdwsYc50nDnTK5DLaQ2PiSoj6I5n K9YAQY9iAYSQ9qRFwKZIOdKPNqsUKIhqfvST72QBRFVckA8hnVlw0h2TGh/QbxHvfS mXHZe1toyIDM0i9gycKwexZdZCQsHXzqRMcrqK6G8Ob8My50PYtQHv+Ezo0J5QwFGT GYv57+sd6oHdA== Received: by letrec.thunk.org (Postfix, from userid 15806) id 2ECA48C02E6; Mon, 18 Sep 2023 16:50:27 -0400 (EDT) Date: Mon, 18 Sep 2023 16:50:27 -0400 From: "Theodore Ts'o" To: Linus Torvalds Cc: Jiri Kosina , Jan Kara , NeilBrown , James Bottomley , Dave Chinner , Eric Sandeen , Steven Rostedt , Guenter Roeck , Christoph Hellwig , ksummit@lists.linux.dev, linux-fsdevel@vger.kernel.org Subject: Re: [MAINTAINERS/KERNEL SUMMIT] Trust and maintenance of file systems Message-ID: References: <169491481677.8274.17867378561711132366@noble.neil.brown.name> <20230917185742.GA19642@mit.edu> <20230918111402.7mx3wiecqt5axvs5@quack3> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org On Mon, Sep 18, 2023 at 12:59:15PM -0700, Linus Torvalds wrote: > On Mon, 18 Sept 2023 at 12:32, Jiri Kosina wrote: > > > > I am afraid this is not reflecting reality. > > > > I am pretty sure that "give me that document on a USB stick, and I'll take > > a look" leads to using things like libreoffice (or any other editor liked > > by general public) to open the file directly on the FAT USB stick. And > > that's pretty much guaranteed to use mmap(). > > Ugh. I would have hoped that anybody will fall back to read/write - > because we definitely have filesystems that don't support mmap. Fortunately, I most of the "simple" file systems appear to support mmap, via generic_file_mmap: % git grep generic_file_mmap | grep ^fs | awk -F/ '{print $2}' | uniq | xargs echo 9p adfs affs afs bfs ecryptfs exfat ext2 fat fuse hfs hfsplus hostfs hpfs jfs minix nfs ntfs ntfs3 omfs ramfs reiserfs smb sysv ubifs ufs vboxsf - Ted