linux-ext4 - Re: [PATCH] generic: Add integrity tests with synchronous directio

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Message-Id: <87sf765gq0.fsf@doe.com>
Date:   Fri, 22 Sep 2023 21:43:11 +0530
From:   Ritesh Harjani (IBM) <ritesh.list@...il.com>
To:     "Darrick J. Wong" <djwong@...nel.org>
Cc:     fstests@...r.kernel.org, linux-ext4@...r.kernel.org,
        Jan Kara <jack@...e.cz>, Theodore Ts'o <tytso@....edu>,
        Gao Xiang <hsiangkao@...ux.alibaba.com>
Subject: Re: [PATCH] generic: Add integrity tests with synchronous directio

"Darrick J. Wong" <djwong@...nel.org> writes:

> On Fri, Sep 22, 2023 at 05:40:36PM +0530, Ritesh Harjani (IBM) wrote:
>> This test covers data & metadata integrity check with directio with
>> o_sync flag and checks the file contents & size after sudden fileystem
>> shutdown once the directio write is completed. ext4 directio after iomap
>> conversion was broken in the sense that if the FS crashes after
>> synchronous directio write, it's file size is not properly updated.
>> This test adds a testcase to cover such scenario.
>> 
>> Man page of open says that -
>> O_SYNC provides synchronized I/O file integrity completion, meaning write
>> operations will flush data and all associated metadata to the underlying
>> hardware
>> 
>> Reported-by: Gao Xiang <hsiangkao@...ux.alibaba.com>
>> Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@...il.com>
>> ---
>>  tests/generic/471     | 45 +++++++++++++++++++++++++++++++++++++++++++
>>  tests/generic/471.out |  8 ++++++++
>>  2 files changed, 53 insertions(+)
>>  create mode 100755 tests/generic/471
>>  create mode 100644 tests/generic/471.out
>> 
>> diff --git a/tests/generic/471 b/tests/generic/471
>> new file mode 100755
>> index 00000000..6c31cff8
>> --- /dev/null
>> +++ b/tests/generic/471
>> @@ -0,0 +1,45 @@
>> +#! /bin/bash
>> +# SPDX-License-Identifier: GPL-2.0
>> +# Copyright (c) 2023 IBM Corporation.  All Rights Reserved.
>> +#
>> +# FS QA Test 471
>> +#
>> +# Integrity test with DIRECT_IO & O_SYNC with sudden shutdown
>> +#
>> +. ./common/preamble
>> +_begin_fstest auto quick shutdown
>> +
>> +# Override the default cleanup function.
>> +_cleanup()
>> +{
>> +	cd /
>> +	rm -r -f $tmp.*
>> +}
>> +
>> +# Import common functions.
>> +. ./common/filter
>> +
>> +# real QA test starts here
>> +
>> +# Modify as appropriate.
>> +_supported_fs generic
>> +_require_scratch
>> +_require_scratch_shutdown
>> +
>> +_scratch_mkfs > $seqres.full 2>&1
>> +_scratch_mount
>> +
>> +echo "Create a 1M file using O_DIRECT & O_SYNC"
>> +xfs_io -fsd -c "pwrite -S 0x5a 0 1M" $SCRATCH_MNT/testfile > /dev/null 2>&1
>
> $XFS_IO_PROG ?

Thanks for pointing out. Will fix it in next rev.

>
> Otherwise looks good to me...

Thanks. I am planning to enhance this integrity test to also cover
synchronous dio (already added), buff-io and aiodio writes as well
in the next revision.

-ritesh