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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CD2F8C433EF for ; Wed, 6 Oct 2021 02:18:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B284361207 for ; Wed, 6 Oct 2021 02:18:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237172AbhJFCUc (ORCPT ); Tue, 5 Oct 2021 22:20:32 -0400 Received: from out30-44.freemail.mail.aliyun.com ([115.124.30.44]:53083 "EHLO out30-44.freemail.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229908AbhJFCUb (ORCPT ); Tue, 5 Oct 2021 22:20:31 -0400 X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R901e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e04357;MF=rongwei.wang@linux.alibaba.com;NM=1;PH=DS;RN=7;SR=0;TI=SMTPD_---0Uqi9lTZ_1633486717; Received: from localhost.localdomain(mailfrom:rongwei.wang@linux.alibaba.com fp:SMTPD_---0Uqi9lTZ_1633486717) by smtp.aliyun-inc.com(127.0.0.1); Wed, 06 Oct 2021 10:18:38 +0800 From: Rongwei Wang To: linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: akpm@linux-foundation.org, willy@infradead.org, song@kernel.org, william.kucharski@oracle.com, hughd@google.com Subject: [PATCH v3 v3 0/2] mm, thp: fix file-backed THP race in collapse_file and truncate pagecache Date: Wed, 6 Oct 2021 10:18:35 +0800 Message-Id: <20211006021837.59721-1-rongwei.wang@linux.alibaba.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210906121200.57905-1-rongwei.wang@linux.alibaba.com> References: <20210906121200.57905-1-rongwei.wang@linux.alibaba.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, We found two bugs related to file-backed THP in our cases, recently. The two bugs rough description as following: 1. in truncate_inode_pages_range, subpage(s) of file-backed THP can be revealed by find_get_entry. 2. 'collapse_file' miss the pages which in writeback but no private. This situation will be triggered in XFS when block size is set to PAGESIZE. These two patches mainly fix the above mentioned bugs, and have been tested in latest branch. Changelog: v2 -> v3: - Patch "mm, thp: lock filemap when truncating page cache" add filemap_invalidate_{un}lock before and after calling truncate_pagecache (Suggested by Song Liu and Matthew). v1 -> v2: - Patch "mm, thp: check page mapping when truncating page cache" move the check of page mapping to behind lock_page. - Patch "mm, thp: bail out early in collapse_file for writeback page" check the writeback flag before taking page lock (Suggested by Yang Shi). v1 link: https://patchwork.kernel.org/project/linux-mm/cover/20210906121200.57905-1-rongwei.wang@linux.alibaba.com/ v2 link: https://patchwork.kernel.org/project/linux-mm/patch/20210922070645.47345-2-rongwei.wang@linux.alibaba.com/ Rongwei Wang (2): mm, thp: lock filemap when truncating page cache mm, thp: bail out early in collapse_file for writeback page fs/open.c | 5 ++++- mm/khugepaged.c | 7 ++++++- 2 files changed, 10 insertions(+), 2 deletions(-) -- 2.27.0