Re: [PATCH V3 5/5] xfs: Check correctness of metadump/mdrestore's ability to work with dirty log

["Darrick J. Wong" <djwong@kernel.org>]

On Thu, Jan 11, 2024 at 05:28:29PM +0530, Chandan Babu R wrote:
> Add a new test to verify if metadump/mdrestore are able to dump and restore
> the contents of a dirty log.
> 
> Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>

Looks fine to me, thanks for adding the new functionality test so we can
cover dirty log restoration.

Reviewed-by: Darrick J. Wong <djwong@kernel.org>

--D

> ---
>  tests/xfs/801     | 178 ++++++++++++++++++++++++++++++++++++++++++++++
>  tests/xfs/801.out |  14 ++++
>  2 files changed, 192 insertions(+)
>  create mode 100755 tests/xfs/801
>  create mode 100644 tests/xfs/801.out
> 
> diff --git a/tests/xfs/801 b/tests/xfs/801
> new file mode 100755
> index 00000000..56acc5ed
> --- /dev/null
> +++ b/tests/xfs/801
> @@ -0,0 +1,178 @@
> +#! /bin/bash
> +# SPDX-License-Identifier: GPL-2.0
> +# Copyright (c) 2024 Oracle, Inc.  All Rights Reserved.
> +#
> +# FS QA Test 801
> +#
> +# Test metadump/mdrestore's ability to dump a dirty log and restore it
> +# correctly.
> +#
> +. ./common/preamble
> +_begin_fstest auto quick metadump log logprint punch
> +
> +# Override the default cleanup function.
> +_cleanup()
> +{
> +	cd /
> +	rm -r -f $tmp.*
> +	_scratch_unmount > /dev/null 2>&1
> +	[[ -n $logdev && $logdev != "none" && $logdev != $SCRATCH_LOGDEV ]] && \
> +		_destroy_loop_device $logdev
> +	[[ -n $datadev ]] && _destroy_loop_device $datadev
> +	rm -r -f $metadump_file $TEST_DIR/data-image \
> +	   $TEST_DIR/log-image
> +}
> +
> +# Import common functions.
> +. ./common/dmflakey
> +. ./common/inject
> +
> +# real QA test starts here
> +_supported_fs xfs
> +_require_scratch
> +_require_test
> +_require_loop
> +_require_xfs_debug
> +_require_xfs_io_error_injection log_item_pin
> +_require_dm_target flakey
> +_require_xfs_io_command "pwrite"
> +_require_test_program "punch-alternating"
> +
> +metadump_file=${TEST_DIR}/${seq}.md
> +testfile=${SCRATCH_MNT}/testfile
> +
> +echo "Format filesystem on scratch device"
> +_scratch_mkfs >> $seqres.full 2>&1
> +
> +max_md_version=1
> +_scratch_metadump_v2_supported && max_md_version=2
> +
> +external_log=0
> +if [[ $USE_EXTERNAL = yes && -n "$SCRATCH_LOGDEV" ]]; then
> +	external_log=1
> +fi
> +
> +if [[ $max_md_version == 1 && $external_log == 1 ]]; then
> +	_notrun "metadump v1 does not support external log device"
> +fi
> +
> +verify_metadump_v1()
> +{
> +	local version=""
> +	if [[ $max_md_version == 2 ]]; then
> +		version="-v 1"
> +	fi
> +
> +	_scratch_xfs_metadump $metadump_file -a -o $version
> +
> +	SCRATCH_DEV=$TEST_DIR/data-image _scratch_xfs_mdrestore $metadump_file
> +
> +	datadev=$(_create_loop_device $TEST_DIR/data-image)
> +
> +	SCRATCH_DEV=$datadev _scratch_mount
> +	SCRATCH_DEV=$datadev _check_scratch_fs
> +	SCRATCH_DEV=$datadev _scratch_unmount
> +
> +	_destroy_loop_device $datadev
> +	datadev=""
> +	rm -f $TEST_DIR/data-image
> +}
> +
> +verify_metadump_v2()
> +{
> +	local version="-v 2"
> +
> +	_scratch_xfs_metadump $metadump_file -a -o $version
> +
> +	# Metadump v2 files can contain contents dumped from an external log
> +	# device. Use a temporary file to hold the log device contents restored
> +	# from such a metadump file.
> +	slogdev=""
> +	if [[ -n $SCRATCH_LOGDEV ]]; then
> +		slogdev=$TEST_DIR/log-image
> +	fi
> +
> +	SCRATCH_DEV=$TEST_DIR/data-image SCRATCH_LOGDEV=$slogdev \
> +		   _scratch_xfs_mdrestore $metadump_file
> +
> +	datadev=$(_create_loop_device $TEST_DIR/data-image)
> +
> +	logdev=""
> +	if [[ -s $slogdev ]]; then
> +		logdev=$(_create_loop_device $slogdev)
> +	fi
> +
> +	SCRATCH_DEV=$datadev SCRATCH_LOGDEV=$logdev _scratch_mount
> +	SCRATCH_DEV=$datadev SCRATCH_LOGDEV=$logdev _check_scratch_fs
> +	SCRATCH_DEV=$datadev SCRATCH_LOGDEV=$logdev _scratch_unmount
> +
> +	if [[ -s $logdev ]]; then
> +		_destroy_loop_device $logdev
> +		logdev=""
> +		rm -f $slogdev
> +	fi
> +
> +	_destroy_loop_device $datadev
> +	datadev=""
> +	rm -f $TEST_DIR/data-image
> +}
> +
> +echo "Initialize and mount filesystem on flakey device"
> +_init_flakey
> +_load_flakey_table $FLAKEY_ALLOW_WRITES
> +_mount_flakey
> +
> +echo "Create test file"
> +$XFS_IO_PROG -s -f -c "pwrite 0 5M" $testfile >> $seqres.full
> +
> +echo "Punch alternative blocks of test file"
> +$here/src/punch-alternating $testfile
> +
> +echo "Mount cycle the filesystem on flakey device"
> +_unmount_flakey
> +_mount_flakey
> +
> +device=$(readlink -f $FLAKEY_DEV)
> +device=$(_short_dev $device)
> +
> +echo "Pin log items in the AIL"
> +echo 1 > /sys/fs/xfs/${device}/errortag/log_item_pin
> +
> +echo "Create two checkpoint transactions on ondisk log"
> +for ct in $(seq 1 2); do
> +	offset=$($XFS_IO_PROG -c 'fiemap' $testfile | tac |  grep -v hole | \
> +			 head -n 1 | awk -F '[\\[.]' '{ print $2 * 512; }')
> +	$XFS_IO_PROG -c "truncate $offset" -c fsync $testfile
> +done
> +
> +echo "Drop writes to filesystem from here onwards"
> +_load_flakey_table $FLAKEY_DROP_WRITES
> +
> +echo "Unpin log items in AIL"
> +echo 0 > /sys/fs/xfs/${device}/errortag/log_item_pin
> +
> +echo "Unmount filesystem on flakey device"
> +_unmount_flakey
> +
> +echo "Clean up flakey device"
> +_cleanup_flakey
> +
> +echo -n "Filesystem has a "
> +_print_logstate
> +
> +echo "Create metadump file, restore it and check restored fs"
> +
> +if [[ $external_log == 0 ]]; then
> +	verify_metadump_v1 $max_md_version
> +fi
> +
> +if [[ $max_md_version == 2 ]]; then
> +	verify_metadump_v2
> +fi
> +
> +# Mount the fs to replay the contents from the dirty log.
> +_scratch_mount
> +
> +# success, all done
> +status=0
> +exit
> diff --git a/tests/xfs/801.out b/tests/xfs/801.out
> new file mode 100644
> index 00000000..a2f2abca
> --- /dev/null
> +++ b/tests/xfs/801.out
> @@ -0,0 +1,14 @@
> +QA output created by 801
> +Format filesystem on scratch device
> +Initialize and mount filesystem on flakey device
> +Create test file
> +Punch alternative blocks of test file
> +Mount cycle the filesystem on flakey device
> +Pin log items in the AIL
> +Create two checkpoint transactions on ondisk log
> +Drop writes to filesystem from here onwards
> +Unpin log items in AIL
> +Unmount filesystem on flakey device
> +Clean up flakey device
> +Filesystem has a dirty log
> +Create metadump file, restore it and check restored fs
> -- 
> 2.43.0
> 
>