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 X-Spam-Level: X-Spam-Status: No, score=-7.2 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5A4A3C43217 for ; Fri, 22 Jan 2021 17:21:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 201BC239D4 for ; Fri, 22 Jan 2021 17:21:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729394AbhAVQCT (ORCPT ); Fri, 22 Jan 2021 11:02:19 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43828 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729305AbhAVQCR (ORCPT ); Fri, 22 Jan 2021 11:02:17 -0500 Received: from fieldses.org (fieldses.org [IPv6:2600:3c00:e000:2f7::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0248FC0613D6; Fri, 22 Jan 2021 08:01:31 -0800 (PST) Received: by fieldses.org (Postfix, from userid 2815) id 465896EA0; Fri, 22 Jan 2021 11:01:29 -0500 (EST) DKIM-Filter: OpenDKIM Filter v2.11.0 fieldses.org 465896EA0 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fieldses.org; s=default; t=1611331289; bh=C1uyBn2BQyVBzkzoIFDiDLUaJ4GVYrCTmuJOgOCNLm0=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=wS+CszPvgU+UvUOL7glyffz488y1gAW2j+6KJGj+4oMkNlv7gRF31pfQZjlqnHUT0 1yUos2dQdiC5ry8dTqU/3rvAsvNqyzNB3vhDLNVSC8R0w+7zf0DydKatw+L5rjSrFG VKX7er2E95K03LAilNk+NFD2lxGQVieg6S9d4xhI= Date: Fri, 22 Jan 2021 11:01:29 -0500 From: "J. Bruce Fields" To: David Howells Cc: Trond Myklebust , Anna Schumaker , Steve French , Dominique Martinet , Takashi Iwai , Matthew Wilcox , linux-afs@lists.infradead.org, Jeff Layton , David Wysochanski , Alexander Viro , linux-cachefs@redhat.com, linux-nfs@vger.kernel.org, linux-cifs@vger.kernel.org, ceph-devel@vger.kernel.org, v9fs-developer@lists.sourceforge.net, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [RFC][PATCH 00/25] Network fs helper library & fscache kiocb API Message-ID: <20210122160129.GB18583@fieldses.org> References: <20210121190937.GE20964@fieldses.org> <20210121174306.GB20964@fieldses.org> <20210121164645.GA20964@fieldses.org> <161118128472.1232039.11746799833066425131.stgit@warthog.procyon.org.uk> <1794286.1611248577@warthog.procyon.org.uk> <1851804.1611255313@warthog.procyon.org.uk> <1856291.1611259704@warthog.procyon.org.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1856291.1611259704@warthog.procyon.org.uk> User-Agent: Mutt/1.5.21 (2010-09-15) Precedence: bulk List-ID: X-Mailing-List: linux-cifs@vger.kernel.org On Thu, Jan 21, 2021 at 08:08:24PM +0000, David Howells wrote: > J. Bruce Fields wrote: > > So, I'm still confused: there must be some case where we know fscache > > actually works reliably and doesn't corrupt your data, right? > > Using ext2/3, for example. I don't know under what circumstances xfs, ext4 > and btrfs might insert/remove blocks of zeros, but I'm told it can happen. Do ext2/3 work well for fscache in other ways? --b.