Re: [PATCH] fstests: btrfs/217 add a test for btrfs seed device stats

[Eryu Guan <guan@eryu.me>]

On Mon, Aug 03, 2020 at 03:25:59PM -0400, Josef Bacik wrote:
> This is a regression test for the issue fixed by
> 
>   btrfs: init device stats for seed devices
> 
> We create a seed device, add a sprout device, and then check the device
> stats after a remount to make sure it succeeds.
> 
> Signed-off-by: Josef Bacik <josef@toxicpanda.com>
> ---
>  tests/btrfs/217     | 71 +++++++++++++++++++++++++++++++++++++++++++++
>  tests/btrfs/217.out | 25 ++++++++++++++++
>  tests/btrfs/group   |  1 +
>  3 files changed, 97 insertions(+)
>  create mode 100755 tests/btrfs/217
>  create mode 100644 tests/btrfs/217.out
> 
> diff --git a/tests/btrfs/217 b/tests/btrfs/217
> new file mode 100755
> index 00000000..204298bd
> --- /dev/null
> +++ b/tests/btrfs/217
> @@ -0,0 +1,71 @@
> +#! /bin/bash
> +# SPDX-License-Identifier: GPL-2.0
> +# Copyright (c) 2020 Facebook.  All Rights Reserved.
> +#
> +# FS QA Test 217
> +#
> +# Regression test for the problem fixed by the patch
> +#
> +#  btrfs: init device stats for seed devices
> +#
> +# Make a seed device, add a sprout to it, and then make sure we can still read
> +# the device stats for both devices after we remount with the new sprout device.
> +#
> +seq=`basename $0`
> +seqres=$RESULT_DIR/$seq
> +echo "QA output created by $seq"
> +
> +here=`pwd`
> +tmp=/tmp/$$
> +status=1	# failure is the default!
> +trap "_cleanup; exit \$status" 0 1 2 3 15
> +
> +_cleanup()
> +{
> +	cd /
> +	rm -f $tmp.*
> +}
> +
> +# get standard environment, filters and checks
> +. ./common/rc
> +. ./common/filter
> +. ./common/filter.btrfs
> +
> +# remove previous $seqres.full before test
> +rm -f $seqres.full
> +
> +# real QA test starts here
> +
> +# Modify as appropriate.
> +_supported_fs btrfs
> +_supported_os Linux
> +_require_test
> +_require_scratch_dev_pool 2
> +
> +_scratch_dev_pool_get 2
> +
> +dev_seed=$(echo $SCRATCH_DEV_POOL | awk '{print $1}')
> +dev_sprout=$(echo $SCRATCH_DEV_POOL | awk '{print $2}')
> +
> +# Create the seed device
> +_mkfs_dev $dev_seed
> +run_check _mount $dev_seed $SCRATCH_MNT

We should avoid using run_check in new tests, as it hides too many
details and make debug much harder.

Otherwise test looks fine. But I'd like to see a review from other btrfs
folks.

Thanks,
Eryu

> +$XFS_IO_PROG -f -d -c "pwrite -S 0xab 0 1M" $SCRATCH_MNT/foo > /dev/null
> +$BTRFS_UTIL_PROG filesystem show -m $SCRATCH_MNT | \
> +	_filter_btrfs_filesystem_show
> +_scratch_unmount
> +$BTRFS_TUNE_PROG -S 1 $dev_seed
> +
> +# Mount the seed device and add the rw device
> +run_check _mount $dev_seed $SCRATCH_MNT
> +_run_btrfs_util_prog device add -f $dev_sprout $SCRATCH_MNT
> +$BTRFS_UTIL_PROG device stats $SCRATCH_MNT | _filter_scratch_pool
> +_scratch_unmount
> +
> +# Now remount, validate the device stats do not fail
> +run_check _mount $dev_sprout $SCRATCH_MNT
> +$BTRFS_UTIL_PROG device stats $SCRATCH_MNT | _filter_scratch_pool
> +
> +# success, all done
> +status=0
> +exit
> diff --git a/tests/btrfs/217.out b/tests/btrfs/217.out
> new file mode 100644
> index 00000000..86c6e775
> --- /dev/null
> +++ b/tests/btrfs/217.out
> @@ -0,0 +1,25 @@
> +QA output created by 217
> +Label: none  uuid: <UUID>
> +	Total devices <NUM> FS bytes used <SIZE>
> +	devid <DEVID> size <SIZE> used <SIZE> path SCRATCH_DEV
> +
> +[SCRATCH_DEV].write_io_errs    0
> +[SCRATCH_DEV].read_io_errs     0
> +[SCRATCH_DEV].flush_io_errs    0
> +[SCRATCH_DEV].corruption_errs  0
> +[SCRATCH_DEV].generation_errs  0
> +[SCRATCH_DEV].write_io_errs    0
> +[SCRATCH_DEV].read_io_errs     0
> +[SCRATCH_DEV].flush_io_errs    0
> +[SCRATCH_DEV].corruption_errs  0
> +[SCRATCH_DEV].generation_errs  0
> +[SCRATCH_DEV].write_io_errs    0
> +[SCRATCH_DEV].read_io_errs     0
> +[SCRATCH_DEV].flush_io_errs    0
> +[SCRATCH_DEV].corruption_errs  0
> +[SCRATCH_DEV].generation_errs  0
> +[SCRATCH_DEV].write_io_errs    0
> +[SCRATCH_DEV].read_io_errs     0
> +[SCRATCH_DEV].flush_io_errs    0
> +[SCRATCH_DEV].corruption_errs  0
> +[SCRATCH_DEV].generation_errs  0
> diff --git a/tests/btrfs/group b/tests/btrfs/group
> index ca90818b..32604e25 100644
> --- a/tests/btrfs/group
> +++ b/tests/btrfs/group
> @@ -219,3 +219,4 @@
>  214 auto quick send snapshot
>  215 auto quick
>  216 auto quick seed
> +217 auto quick volume
> -- 
> 2.24.1