linux-kernel - Re: [PATCHv2 4/4] generic/677: Add a test to check unwritten extents tracking

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Date:   Tue, 15 Mar 2022 09:56:07 -0700
From:   "Darrick J. Wong" <djwong@...nel.org>
To:     Ritesh Harjani <riteshh@...ux.ibm.com>
Cc:     fstests <fstests@...r.kernel.org>, linux-ext4@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2 4/4] generic/677: Add a test to check unwritten extents
 tracking

On Tue, Mar 15, 2022 at 07:58:59PM +0530, Ritesh Harjani wrote:
> With these sequence of operation (in certain cases like with ext4 fast_commit)
> could miss to track unwritten extents during replay phase
> (after sudden FS shutdown).
> 
> This fstest adds a test case to test this.
> 
> 5e4d0eba1ccaf19f
> ext4: fix fast commit may miss tracking range for FALLOC_FL_ZERO_RANGE
> 
> Signed-off-by: Ritesh Harjani <riteshh@...ux.ibm.com>
> ---
>  tests/generic/677     | 64 +++++++++++++++++++++++++++++++++++++++++++
>  tests/generic/677.out |  6 ++++
>  2 files changed, 70 insertions(+)
>  create mode 100755 tests/generic/677
>  create mode 100644 tests/generic/677.out
> 
> diff --git a/tests/generic/677 b/tests/generic/677
> new file mode 100755
> index 00000000..e316763a
> --- /dev/null
> +++ b/tests/generic/677
> @@ -0,0 +1,64 @@
> +#! /bin/bash
> +# SPDX-License-Identifier: GPL-2.0
> +# Copyright (c) 2022 IBM Corporation.  All Rights Reserved.
> +#
> +# FS QA Test 677
> +#
> +# Test below sequence of operation which (w/o below kernel patch) in case of
> +# ext4 with fast_commit may misss to track unwritten extents.
> +# commit 5e4d0eba1ccaf19f
> +# ext4: fix fast commit may miss tracking range for FALLOC_FL_ZERO_RANGE
> +#
> +. ./common/preamble
> +_begin_fstest auto quick log shutdown recoveryloop
> +
> +# Override the default cleanup function.
> +_cleanup()
> +{
> +	cd /
> +	rm -r -f $tmp.*
> +}
> +
> +# Import common functions.
> +. ./common/filter
> +. ./common/punch
> +
> +# real QA test starts here
> +
> +# Modify as appropriate.
> +_supported_fs generic
> +_require_scratch
> +_require_xfs_io_command "fzero"
> +_require_xfs_io_command "fiemap"
> +
> +t1=$SCRATCH_MNT/t1
> +
> +_scratch_mkfs > $seqres.full 2>&1
> +
> +_scratch_mount >> $seqres.full 2>&1
> +
> +bs=$(_get_block_size $SCRATCH_MNT)

Same comments about blocksize, group names, and
_require_scratch_shutdown as the last patch.

--D

> +
> +# create and write data to t1
> +$XFS_IO_PROG -f -c "pwrite 0 $((100*$bs))" $t1 | _filter_xfs_io_numbers
> +
> +# fsync t1
> +$XFS_IO_PROG -c "fsync" $t1
> +
> +# fzero certain range in between
> +$XFS_IO_PROG -c "fzero -k  $((40*$bs)) $((20*$bs))" $t1
> +
> +# fsync t1
> +$XFS_IO_PROG -c "fsync" $t1
> +
> +# shutdown FS now for replay of journal to kick during next mount
> +_scratch_shutdown -v >> $seqres.full 2>&1
> +
> +_scratch_cycle_mount
> +
> +# check fiemap reported is valid or not
> +$XFS_IO_PROG -c "fiemap -v" $t1 | _filter_fiemap_flags $bs
> +
> +# success, all done
> +status=0
> +exit
> diff --git a/tests/generic/677.out b/tests/generic/677.out
> new file mode 100644
> index 00000000..b91ab77a
> --- /dev/null
> +++ b/tests/generic/677.out
> @@ -0,0 +1,6 @@
> +QA output created by 677
> +wrote XXXX/XXXX bytes at offset XXXX
> +XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> +0: [0..39]: none
> +1: [40..59]: unwritten
> +2: [60..99]: nonelast
> --
> 2.31.1
>