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=-13.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 BA4A2C433E0 for ; Mon, 15 Mar 2021 05:40:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 87C5D64E1F for ; Mon, 15 Mar 2021 05:40:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229529AbhCOFjp (ORCPT ); Mon, 15 Mar 2021 01:39:45 -0400 Received: from mx2.suse.de ([195.135.220.15]:42522 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230046AbhCOFjV (ORCPT ); Mon, 15 Mar 2021 01:39:21 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1615786761; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=qlyiAoqmx4SfEkoYjNi8iAQwbg1RGbLLZQsCx8u+A1s=; b=iB5hgtJkC9oc2temsBBjT6ljqfakwntZhaFX6CHbRv3DxJnQiGbPWqpvDOZ2YNwynPy8Hc RECkGObp7ZVEFipulRelfJSvJZuIL55ZsZsLXBx9VFOoKrlWjusUV5eDIqP7kZfrAJamph 3oGujtIEE0Ro5nuD7tSSt2BE5EO2CnE= Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id E0FA5AC1F for ; Mon, 15 Mar 2021 05:39:20 +0000 (UTC) From: Qu Wenruo To: linux-btrfs@vger.kernel.org Subject: [PATCH 0/2] btrfs: fixes for subpage which also affect read-only mount Date: Mon, 15 Mar 2021 13:39:13 +0800 Message-Id: <20210315053915.62420-1-wqu@suse.com> X-Mailer: git-send-email 2.30.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org During the fstests run for btrfs subpage read-write support, generic/475 crashes the system with a very high chance. It turns out the cause is also affecting btrfs subpage read-only mount so it's worthy a quick fix. Also the crash call site shows a new rabbit hole of hard coded PAGE_SHIFT in readahead. This reada problem does not only greatly slow down my test on my ARM board, but also affects read-only mount. So this patchset is here to address the problems, and hope these fixes can fit into current merge window. Qu Wenruo (2): btrfs: fix wild pointer access during metadata read failure for subpage btrfs: make reada to be subpage compatible fs/btrfs/extent_io.c | 31 ++++++++++++++++++++++++++++++- fs/btrfs/reada.c | 35 ++++++++++++++++++----------------- 2 files changed, 48 insertions(+), 18 deletions(-) -- 2.30.1