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=-9.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 DC6CBC2D0A3 for ; Mon, 9 Nov 2020 13:09:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8A6EB20731 for ; Mon, 9 Nov 2020 13:09:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604927352; bh=WDKk+UPeIRY8w8AwhkrS1+qUoIF2lOtRMFUGgca2mwg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=SY8iuXKdpQ6rDhOErFkqz4ZIvxUC6kKMV6OH7paeF0VHoSOwPGLosW6HmYn6exNe4 IVPtMC/V8Os2JDWQw98xfHnBhDdWSBryaI9aafGT3Karc4sOs/Us42spWzTkvrC+0F mLV95K5Ncwl/Ix9AkdAqRTx41wTjfz8xAJPFCF6A= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731801AbgKINJL (ORCPT ); Mon, 9 Nov 2020 08:09:11 -0500 Received: from mail.kernel.org ([198.145.29.99]:33984 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731794AbgKINJE (ORCPT ); Mon, 9 Nov 2020 08:09:04 -0500 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id BE8CC2083B; Mon, 9 Nov 2020 13:09:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604927344; bh=WDKk+UPeIRY8w8AwhkrS1+qUoIF2lOtRMFUGgca2mwg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZfbgJu/Kj3scDYyQSDQgjuFyO8svgw1PJYilNiDJeXklSdalg6EhmxiAuILG60LoI bBymw9o3o6c0UcAyQTDbm5LF9HbjEsytXf1aWvL9CG1xw2gySQAyBSqQtzOLPgyATJ laXufnCVeAlhwCddeYiGx8+e5cFLyWHyV6XPrPXc= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Anand Jain , Qu Wenruo , David Sterba , Ben Hutchings Subject: [PATCH 4.19 27/71] btrfs: tree-checker: Fix wrong check on max devid Date: Mon, 9 Nov 2020 13:55:21 +0100 Message-Id: <20201109125021.183039143@linuxfoundation.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201109125019.906191744@linuxfoundation.org> References: <20201109125019.906191744@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Qu Wenruo commit 8bb177d18f114358a57d8ae7e206861b48b8b4de upstream. [BUG] The following script will cause false alert on devid check. #!/bin/bash dev1=/dev/test/test dev2=/dev/test/scratch1 mnt=/mnt/btrfs umount $dev1 &> /dev/null umount $dev2 &> /dev/null umount $mnt &> /dev/null mkfs.btrfs -f $dev1 mount $dev1 $mnt _fail() { echo "!!! FAILED !!!" exit 1 } for ((i = 0; i < 4096; i++)); do btrfs dev add -f $dev2 $mnt || _fail btrfs dev del $dev1 $mnt || _fail dev_tmp=$dev1 dev1=$dev2 dev2=$dev_tmp done [CAUSE] Tree-checker uses BTRFS_MAX_DEVS() and BTRFS_MAX_DEVS_SYS_CHUNK() as upper limit for devid. But we can have devid holes just like above script. So the check for devid is incorrect and could cause false alert. [FIX] Just remove the whole devid check. We don't have any hard requirement for devid assignment. Furthermore, even devid could get corrupted by a bitflip, we still have dev extents verification at mount time, so corrupted data won't sneak in. This fixes fstests btrfs/194. Reported-by: Anand Jain Fixes: ab4ba2e13346 ("btrfs: tree-checker: Verify dev item") CC: stable@vger.kernel.org # 5.2+ Signed-off-by: Qu Wenruo Reviewed-by: David Sterba Signed-off-by: David Sterba [bwh: Backported to 4.19: adjust context] Signed-off-by: Ben Hutchings Signed-off-by: Greg Kroah-Hartman --- fs/btrfs/tree-checker.c | 7 ------- 1 file changed, 7 deletions(-) --- a/fs/btrfs/tree-checker.c +++ b/fs/btrfs/tree-checker.c @@ -629,7 +629,6 @@ static int check_dev_item(struct btrfs_f struct btrfs_key *key, int slot) { struct btrfs_dev_item *ditem; - u64 max_devid = max(BTRFS_MAX_DEVS(fs_info), BTRFS_MAX_DEVS_SYS_CHUNK); if (key->objectid != BTRFS_DEV_ITEMS_OBJECTID) { dev_item_err(fs_info, leaf, slot, @@ -637,12 +636,6 @@ static int check_dev_item(struct btrfs_f key->objectid, BTRFS_DEV_ITEMS_OBJECTID); return -EUCLEAN; } - if (key->offset > max_devid) { - dev_item_err(fs_info, leaf, slot, - "invalid devid: has=%llu expect=[0, %llu]", - key->offset, max_devid); - return -EUCLEAN; - } ditem = btrfs_item_ptr(leaf, slot, struct btrfs_dev_item); if (btrfs_device_id(leaf, ditem) != key->offset) { dev_item_err(fs_info, leaf, slot,