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Date:   Thu, 19 Aug 2021 16:49:08 +0800
From:   Zorro Lang <zlang@...hat.com>
To:     bxue@...hat.com
Cc:     fstests@...r.kernel.org, jack@...e.cz, eguan@...ux.alibaba.com,
        linux-ext4@...r.kernel.org
Subject: Re: [PATCH v2] ext4: regression test for "tune2fs -l" after ext4
 shutdown

On Thu, Aug 19, 2021 at 04:07:51PM +0800, bxue@...hat.com wrote:
> From: Boyang Xue <bxue@...hat.com>
> 
> Regression test for:
> 
> e905fbe3fd0f ext4: Fix tune2fs checksum failure for mounted filesystem
> 
> This test runs "tune2fs -l" after ext4 shutdown. tune2fs reads superblock
> checksum from the buffer cache. On unfixed kernels, the checksum is incorrect
> until the writeout happens, so tune2fs fails with "superblock checksum does not
> match" in this case.
> 
> Signed-off-by: Boyang Xue <bxue@...hat.com>
> ---

Good to me,
Reviewed-by: Zorro Lang <zlang@...hat.com>

> Hi,
> 
> This is the v2 of the test. I have fixed various errors in this version
> according to comments for v1. Hope I'm not missing anything here. Please help
> review it. Thanks!
> 
> 
> JFYI, I paste the test log here:
> 
> On good kernel
> ```
> [root@...101 repo_xfstests]# ./check ext4/309
> FSTYP         -- ext4
> PLATFORM      -- Linux/x86_64 kvm101 4.18.0-305.el8.x86_64 #1 SMP Mon Aug 16 15:20:14 EDT 2021
> MKFS_OPTIONS  -- -b 1024 /dev/vda2
> MOUNT_OPTIONS -- -o rw,relatime,seclabel -o context=system_u:object_r:root_t:s0 /dev/vda2 /scratch
> 
> ext4/309 1s ...  1s
> Ran: ext4/309
> Passed all 1 tests
> 
> [root@...101 repo_xfstests]# cat results/ext4/309.out.bad
> cat: results/ext4/309.out.bad: No such file or directory
> [root@...101 repo_xfstests]# cat results/ext4/309.full
> tune2fs 1.45.6 (20-Mar-2020)
> Filesystem volume name:   <none>
> Last mounted on:          /scratch
> Filesystem UUID:          f1ffdc35-a925-4007-99ab-b8f3bdec21cd
> ```
> 
> On bad kerenel
> ```
> [root@...102 repo_xfstests]# ./check ext4/309
> FSTYP         -- ext4
> PLATFORM      -- Linux/x86_64 kvm102 5.14.0-0.rc4.35.xx.x86_64 #1 SMP Tue Aug 3 13:02:44 EDT 2021
> MKFS_OPTIONS  -- -b 1024 /dev/vda3
> MOUNT_OPTIONS -- -o acl,user_xattr -o context=system_u:object_r:root_t:s0 /dev/vda3 /scratch
> 
> ext4/309        - output mismatch (see /root/repo_xfstests/results//ext4/309.out.bad)
>     --- tests/ext4/309.out      2021-08-19 05:02:40.188366781 -0400
>     +++ /root/repo_xfstests/results//ext4/309.out.bad   2021-08-19 08:02:47.902366781 -0400
>     @@ -1,2 +1,4 @@
>      QA output created by 309
>      Silence is golden
>     +/usr/sbin/tune2fs: Superblock checksum does not match superblock while trying to open /dev/vda3
>     +Couldn't find valid filesystem superblock.
>     ...
>     (Run 'diff -u /root/repo_xfstests/tests/ext4/309.out /root/repo_xfstests/results//ext4/309.out.bad'  to see the entire diff)
> Ran: ext4/309
> Failures: ext4/309
> Failed 1 of 1 tests
> [root@...102 repo_xfstests]# cat results/ext4/309.out.bad
> QA output created by 309
> Silence is golden
> /usr/sbin/tune2fs: Superblock checksum does not match superblock while trying to open /dev/vda3
> Couldn't find valid filesystem superblock.
> [root@...102 repo_xfstests]# cat results/ext4/309.full
> tune2fs 1.46.2 (28-Feb-2021)
> ```
> 
> -Boyang
> 
>  tests/ext4/309     | 29 +++++++++++++++++++++++++++++
>  tests/ext4/309.out |  2 ++
>  2 files changed, 31 insertions(+)
>  create mode 100755 tests/ext4/309
>  create mode 100644 tests/ext4/309.out
> 
> diff --git a/tests/ext4/309 b/tests/ext4/309
> new file mode 100755
> index 00000000..8594d264
> --- /dev/null
> +++ b/tests/ext4/309
> @@ -0,0 +1,29 @@
> +#! /bin/bash
> +# SPDX-License-Identifier: GPL-2.0
> +# Copyright (c) 2021 Red Hat Inc.  All Rights Reserved.
> +#
> +# FS QA Test 309
> +#
> +# Test that tune2fs doesn't fail after ext4 shutdown
> +# Regression test for commit:
> +# e905fbe3fd0f ext4: Fix tune2fs checksum failure for mounted filesystem
> +#
> +. ./common/preamble
> +_begin_fstest auto rw quick
> +
> +# real QA test starts here
> +_supported_fs ext4
> +_require_scratch
> +_require_scratch_shutdown
> +_require_command "$TUNE2FS_PROG" tune2fs
> +
> +echo "Silence is golden"
> +
> +_scratch_mkfs >/dev/null 2>&1
> +_scratch_mount
> +echo "This is a test" > $SCRATCH_MNT/testfile
> +_scratch_shutdown
> +_scratch_cycle_mount
> +$TUNE2FS_PROG -l $SCRATCH_DEV >> $seqres.full
> +status=0
> +exit
> diff --git a/tests/ext4/309.out b/tests/ext4/309.out
> new file mode 100644
> index 00000000..56330d65
> --- /dev/null
> +++ b/tests/ext4/309.out
> @@ -0,0 +1,2 @@
> +QA output created by 309
> +Silence is golden
> -- 
> 2.27.0
> 

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