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=-3.8 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 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 5CCDAC433E7 for ; Fri, 16 Oct 2020 18:25:17 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id BE7F6208E4 for ; Fri, 16 Oct 2020 18:25:16 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="TuiG8BFD" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BE7F6208E4 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux-foundation.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 3AC486B0062; Fri, 16 Oct 2020 14:25:16 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 35BF16B0068; Fri, 16 Oct 2020 14:25:16 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 272BD900002; Fri, 16 Oct 2020 14:25:16 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0002.hostedemail.com [216.40.44.2]) by kanga.kvack.org (Postfix) with ESMTP id 831FE6B0062 for ; Fri, 16 Oct 2020 14:25:15 -0400 (EDT) Received: from smtpin01.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 66FC8181AEF1F for ; Fri, 16 Oct 2020 18:25:14 +0000 (UTC) X-FDA: 77378615748.01.sofa82_4f147022721f Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin01.hostedemail.com (Postfix) with ESMTP id 3C2FE10045C0D for ; Fri, 16 Oct 2020 18:25:14 +0000 (UTC) X-HE-Tag: sofa82_4f147022721f X-Filterd-Recvd-Size: 4053 Received: from mail-lf1-f65.google.com (mail-lf1-f65.google.com [209.85.167.65]) by imf10.hostedemail.com (Postfix) with ESMTP for ; Fri, 16 Oct 2020 18:25:13 +0000 (UTC) Received: by mail-lf1-f65.google.com with SMTP id 77so4154589lfl.2 for ; Fri, 16 Oct 2020 11:25:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=kVhhuBbfLfLYQkngLsFD3UUt9rOgtrwkRBlITbSg1HA=; b=TuiG8BFDTqK33IsdvgsRzNjznNYhEPcEgZFtMZZjFXUvdEnKTK4CAvhFDpeWkfixSk PzmIe02r8wdxJIriM9RvsAEtD1V1EB7cQ4vXwojwGXrW9atpUOegVSWIg31NFsMHC/as MGmSGZm4CYtxH+Ah7sO9FCAths+ONkR8lo9xk= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=kVhhuBbfLfLYQkngLsFD3UUt9rOgtrwkRBlITbSg1HA=; b=rfj23OGp4c1If+lsN5DPZ0f++2uhf/6zitEJRfarbo6/AfwmFtWDJJPl81C2QrjALm VSRZ09jwMXEBLhJ0WD+GfU8UQ7byCPWXLGxBTmvrQU2hT6Yo70qHhoHS8UKSgBNXrlLc 6FY6n21ebkSNvgm7PA/KwGi7GgqNuoVdK7PKZwsSd4eI9NGzPZu83v7cSOgeeufkuYpV VHLFAwgXWr8w3fNK8xUPtB/eRMBzTQLapd9Z7QlO40OR6EAboiBv9rLuyTMUKMSVCFuK J2H+i2+GyocaNFfYwK85DjOiIi33h3j0hOheKmO3BQkkAlbsHLan1egFpDo0DjHjMa6a yUGg== X-Gm-Message-State: AOAM531cm3lxrGmKc/reDd7RNh6EFHoMFy/pYHcwGkDWkhSbaNihA50x 7DQAIqs5q3oIuR3riDsXbHS7pDAfeF4p2A== X-Google-Smtp-Source: ABdhPJxGVHZW78QX76GIHchFpuSrAf7P/Zj/UvaJrSfBRY1TMnkzxWDz57cpVBCnQUxibwiTDVGMTw== X-Received: by 2002:a19:ee12:: with SMTP id g18mr2091682lfb.515.1602872712249; Fri, 16 Oct 2020 11:25:12 -0700 (PDT) Received: from mail-lf1-f50.google.com (mail-lf1-f50.google.com. [209.85.167.50]) by smtp.gmail.com with ESMTPSA id u6sm1057964lfu.32.2020.10.16.11.25.10 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 16 Oct 2020 11:25:10 -0700 (PDT) Received: by mail-lf1-f50.google.com with SMTP id l28so4114914lfp.10 for ; Fri, 16 Oct 2020 11:25:10 -0700 (PDT) X-Received: by 2002:ac2:5f48:: with SMTP id 8mr1987164lfz.344.1602872709767; Fri, 16 Oct 2020 11:25:09 -0700 (PDT) MIME-Version: 1.0 References: <4794a3fa3742a5e84fb0f934944204b55730829b.camel@lca.pw> <20201015151606.GA226448@redhat.com> <20201015195526.GC226448@redhat.com> <20201016181908.GA282856@redhat.com> In-Reply-To: From: Linus Torvalds Date: Fri, 16 Oct 2020 11:24:53 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: Possible deadlock in fuse write path (Was: Re: [PATCH 0/4] Some more lock_page work..) To: Vivek Goyal Cc: Miklos Szeredi , Qian Cai , Hugh Dickins , Matthew Wilcox , "Kirill A . Shutemov" , Linux-MM , Andrew Morton , linux-fsdevel , Amir Goldstein Content-Type: text/plain; charset="UTF-8" X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, Oct 16, 2020 at 11:24 AM Linus Torvalds wrote: > > Looking at that code, I don't see why the page needs to be unlocked [..] That "unlocked" should be "locked", of course. Linus