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[2620:137:e000::1:20]) by mx.google.com with ESMTP id x4-20020a50f184000000b00425d7cf93e1si4685167edl.332.2022.04.25.09.18.47; Mon, 25 Apr 2022 09:19:19 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=temperror (no key for signature) header.i=@szeredi.hu header.s=google header.b=YIsai6GV; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233100AbiDYMoh (ORCPT + 99 others); Mon, 25 Apr 2022 08:44:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42916 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232660AbiDYMod (ORCPT ); Mon, 25 Apr 2022 08:44:33 -0400 Received: from mail-ed1-x536.google.com (mail-ed1-x536.google.com [IPv6:2a00:1450:4864:20::536]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 02F2BCE4AB for ; Mon, 25 Apr 2022 05:41:29 -0700 (PDT) Received: by mail-ed1-x536.google.com with SMTP id p4so2609430edx.0 for ; Mon, 25 Apr 2022 05:41:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=szeredi.hu; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=9DsLpqQPuxCK2Mrehw4P0708AXzU3xBMKVlsThqy3Zc=; b=YIsai6GVstoGAERSXy61aZOo146osRmFisTtgf1r43CWKdN0WObYtifthAbCAQXzY3 tqDNkB8lZMG8O+ZA3BI7ARoIlT9sDW4DiT6LNdT+qU2+HKoMz7Klz4vA4aiecr6cuU0N 31+H7m93zTKZRdQm5Ly7aMJZqVx4OM7TEkO7E= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=9DsLpqQPuxCK2Mrehw4P0708AXzU3xBMKVlsThqy3Zc=; b=H3JIonjIVdYaDwlTxrgJ5T3eSDkIFRlA6PaWgT687Ch13vlO8giekbN/aHuFgbilxc ZXA8I35mSMgNQg7+M7zYZQ4w2PR07wPkEhyrOReDqTpQ+xfoYJOHDQJ2Ay5ZYnBytbGw GwQQWMA8wv7eVLIT2nxweZdFZE47R1X/NDOYNWUpd/VL/r1FT+Pv9a6ndKnQQ/bFE/kv YL6qh+s/0t6MJa0HjPmiB/LJHEHIjdso29UZnu9toKPT5OKO0BYwCfwdFkPmBIOXQY1i LcIpU0W0bmswSki2rQAeLM+6IwsRUdngKk6sVL0Ji/U9AmIU1ttpddfypmnrwsbN32On FtdQ== X-Gm-Message-State: AOAM533BQiEJAC37OH6KxBmPM/KFG5EPyz8C9M6DqE/uAhFGkwnQn6H+ s2OWZcCt19lAMGNBSUdUE71b6i54m2siI00eEh4vuA== X-Received: by 2002:a05:6402:274b:b0:423:fe73:95a0 with SMTP id z11-20020a056402274b00b00423fe7395a0mr18665932edd.224.1650890487604; Mon, 25 Apr 2022 05:41:27 -0700 (PDT) MIME-Version: 1.0 References: <20220325132126.61949-1-zhangjiachen.jaycee@bytedance.com> In-Reply-To: <20220325132126.61949-1-zhangjiachen.jaycee@bytedance.com> From: Miklos Szeredi Date: Mon, 25 Apr 2022 14:41:16 +0200 Message-ID: Subject: Re: [RFC PATCH] fuse: support cache revalidation in writeback_cache mode To: Jiachen Zhang Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Xie Yongji Content-Type: text/plain; charset="UTF-8" X-Spam-Status: No, score=-1.7 required=5.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 25 Mar 2022 at 14:23, Jiachen Zhang wrote: > > Hi all, > > This RFC patch implements attr cache and data cache revalidation for > fuse writeback_cache mode in kernel. Looking forward to any suggestions > or comments on this feature. Quick question before going into the details: could the cache revalidation be done in the userspace filesystem instead, which would set/clear FOPEN_KEEP_CACHE based on the result of the revalidation? Thanks, Miklos