Re: [PATCH v1] btrfs: Add new test for setting the chunk size.

[Eryu Guan <guan@eryu.me>]

On Tue, Feb 08, 2022 at 11:32:52AM -0800, Stefan Roesch wrote:
> Add new testcase for testing the new btrfs sysfs knob to change the
> chunk size. The new knob uses /sys/fs/btrfs/<UUID>/allocation/<block
> type>/chunk_size.
> 
> The test case implements three different cases:
> - Test allocation with the default chunk size
> - Test allocation after increasing the chunk size
> - Test allocation when the free space is smaller than the chunk size.
> 
> Note: this test needs to force the allocation of space. It uses the
> /sys/fs/btrfs/<UUID>/allocation/<block type>/force_chunk_alloc knob.
> 
> Testing:
> The test has been run with volumes of different sizes.
> 
> Signed-off-by: Stefan Roesch <shr@fb.com>

I think this test had been committed as btrfs/253, would you please
double check?

Thanks,
Eryu

> ---
>  tests/btrfs/257     | 273 ++++++++++++++++++++++++++++++++++++++++++++
>  tests/btrfs/257.out |  10 ++
>  2 files changed, 283 insertions(+)
>  create mode 100755 tests/btrfs/257
>  create mode 100644 tests/btrfs/257.out
> 
> diff --git a/tests/btrfs/257 b/tests/btrfs/257
> new file mode 100755
> index 00000000..00a099a5
> --- /dev/null
> +++ b/tests/btrfs/257
> @@ -0,0 +1,273 @@
> +#!/bin/bash
> +# SPDX-License-Identifier: GPL-2.0
> +# Copyright (c) 2021 Facebook.  All Rights Reserved.
> +#
> +# FS QA Test 257
> +#
> +# Test the new /sys/fs/btrfs/<uuid>/allocation/<block-type>/chunk_size
> +# setting. This setting allows the admin to change the chunk size
> +# setting for the next allocation.
> +#
> +# Test 1:
> +#   Allocate storage for all three block types (data, metadata and system)
> +#   with the default chunk size.
> +#
> +# Test 2:
> +#   Set a new chunk size to double the default size and allocate space
> +#   for all new block types with the new chunk size.
> +#
> +# Test 3:
> +#   Pick an allocation size that is used in a loop and make sure the last
> +#   allocation cannot be partially fullfilled.
> +#
> +# Note: Variable naming uses the following convention: if a variable name
> +#       ends in "_B" then its a byte value, if it ends in "_MB" then the
> +#       value is in megabytes.
> +#
> +. ./common/preamble
> +_begin_fstest auto
> +
> +seq=`basename $0`
> +seqres="${RESULT_DIR}/${seq}"
> +
> +# Parse a size string which is in the format "XX.XXMib".
> +#
> +# Parameters:
> +#   - (IN)    Block group type (Data, Metadata, System)
> +#   - (INOUT) Variable to store block group size in MB
> +#
> +parse_size_string() {
> +	local SIZE=$(echo "$1" | $AWK_PROG 'match($0, /([0-9.]+)/) { print substr($0, RSTART, RLENGTH) }')
> +	eval $2="${SIZE%.*}"
> +}
> +
> +# Determine the size of the device in MB.
> +#
> +# Parameters:
> +#   - (INOUT) Variable to store device size in MB
> +#
> +device_size() {
> +	$BTRFS_UTIL_PROG filesystem show ${SCRATCH_MNT} --mbytes | grep devid >> $seqres.full
> +	local SIZE=$($BTRFS_UTIL_PROG filesystem show ${SCRATCH_MNT} --mbytes | grep devid)
> +	parse_size_string $(echo "${SIZE}" | awk '{print $4}') SIZE_ALLOC
> +	eval $1=${SIZE_ALLOC%.*}
> +}
> +
> +# Determine the free space of a block group in MB.
> +#
> +# Parameters:
> +#   - (INOUT) Variable to store free space in MB
> +#
> +free_space() {
> +	local SIZE=$($BTRFS_UTIL_PROG filesystem show ${SCRATCH_MNT} --mbytes | grep devid)
> +	parse_size_string $(echo "${SIZE}" | awk '{print $4}') SIZE_ALLOC
> +	parse_size_string $(echo "${SIZE}" | awk '{print $6}') SIZE_USED
> +	eval $1=$(expr ${SIZE_ALLOC} - ${SIZE_USED})
> +}
> +
> +# Determine how much space in MB has been allocated to a block group.
> +#
> +# Parameters:
> +#   - (IN)    Block group type (Data, Metadata, System)
> +#   - (INOUT) Variable to store block group size in MB
> +#
> +alloc_size() {
> +	local SIZE_STRING=$($BTRFS_UTIL_PROG filesystem df ${SCRATCH_MNT} -m | grep  "$1" | awk '{print $3}')
> +	parse_size_string ${SIZE_STRING} BLOCK_GROUP_SIZE
> +	eval $2="${BLOCK_GROUP_SIZE}"
> +}
> +
> +. ./common/filter
> +_supported_fs btrfs
> +_require_test
> +_require_scratch
> +
> +# Delete log file if it exists.
> +rm -f "${seqres}.full"
> +
> +# Make filesystem. 10GB is needed to test different chunk sizes for
> +# metadata and data and the default size for volumes > 5GB is different.
> +_scratch_mkfs_sized $((10 * 1024 * 1024 * 1024)) >> $seqres.full 2>&1
> +_scratch_mount >> $seqres.full 2>&1
> +
> +# Check if there is sufficient sysfs support.
> +_require_fs_sysfs allocation/metadata/chunk_size
> +_require_fs_sysfs allocation/metadata/force_chunk_alloc
> +
> +# Get free space.
> +free_space  FREE_SPACE_MB
> +device_size DEVICE_SIZE_MB
> +
> +echo "free space = ${FREE_SPACE_MB}MB" >> ${seqres}.full
> +
> +# If device is a symbolic link, get block device.
> +SCRATCH_BDEV=$(_real_dev $SCRATCH_DEV)
> +
> +# Get chunk sizes.
> +echo "Capture default chunk sizes."
> +FIRST_DATA_CHUNK_SIZE_B=$(_get_fs_sysfs_attr ${SCRATCH_BDEV} allocation/data/chunk_size)
> +FIRST_METADATA_CHUNK_SIZE_B=$(_get_fs_sysfs_attr ${SCRATCH_BDEV} allocation/metadata/chunk_size)
> +
> +echo "Orig Data chunk size    = ${FIRST_DATA_CHUNK_SIZE_B}"     >> ${seqres}.full
> +echo "Orig Metaata chunk size = ${FIRST_METADATA_CHUNK_SIZE_B}" >> ${seqres}.full
> +
> +INIT_ALLOC_SIZE_MB=$(expr \( ${FIRST_DATA_CHUNK_SIZE_B} + ${FIRST_METADATA_CHUNK_SIZE_B} \) / 1024 / 1024)
> +echo "Allocation size for initial allocation = ${INIT_ALLOC_SIZE_MB}MB" >> $seqres.full
> +
> +#
> +# Do first allocation with the default chunk sizes for the different block
> +# types.
> +#
> +echo "First allocation."
> +alloc_size "Data"     DATA_SIZE_START_MB
> +alloc_size "Metadata" METADATA_SIZE_START_MB
> +
> +echo "Block group Data alloc size     = ${DATA_SIZE_START_MB}MB"     >> $seqres.full
> +echo "Block group Metadata alloc size = ${METADATA_SIZE_START_MB}MB" >> $seqres.full
> +
> +_set_fs_sysfs_attr ${SCRATCH_BDEV} allocation/data/force_chunk_alloc 1
> +_set_fs_sysfs_attr ${SCRATCH_BDEV} allocation/metadata/force_chunk_alloc 1
> +
> +alloc_size "Data"     FIRST_DATA_SIZE_MB
> +alloc_size "Metadata" FIRST_METADATA_SIZE_MB
> +
> +echo "First block group Data alloc size     = ${FIRST_DATA_SIZE_MB}MB"     >> ${seqres}.full
> +echo "First block group Metadata alloc size = ${FIRST_METADATA_SIZE_MB}MB" >> ${seqres}.full
> +
> +free_space FREE_SPACE_AFTER
> +echo "Free space after first allocation = ${FREE_SPACE_AFTER}MB" >> ${seqres}.full
> +
> +#
> +# Do allocation with the doubled chunk sizes for the different block types.
> +#
> +echo "Second allocation."
> +SECOND_DATA_CHUNK_SIZE_B=$(expr ${FIRST_DATA_CHUNK_SIZE_B} \* 2)
> +SECOND_METADATA_CHUNK_SIZE_B=$(expr ${FIRST_METADATA_CHUNK_SIZE_B} \* 2)
> +
> +echo "Second block group Data calc alloc size     = ${SECOND_DATA_CHUNK_SIZE_B}"     >> $seqres.full
> +echo "Second block group Metadata calc alloc size = ${SECOND_METADATA_CHUNK_SIZE_B}" >> $seqres.full
> +
> +# Stripe size is limited to 10% of device size.
> +if [[ ${SECOND_DATA_CHUNK_SIZE_B} -gt $(expr ${DEVICE_SIZE_MB} \* 10 \* 1024 \* 1024 / 100) ]]; then
> +	SECOND_DATA_CHUNK_SIZE_B=$(expr ${DEVICE_SIZE_MB} \* 10 / 100 \* 1024 \* 1024)
> +fi
> +if [[ ${SECOND_METADATA_CHUNK_SIZE_B} -gt $(expr ${DEVICE_SIZE_MB} \* 10 \* 1024 \* 1024 / 100) ]]; then
> +	SECOND_METADATA_CHUNK_SIZE_B=$(expr ${DEVICE_SIZE_MB} \* 10 / 100 \* 1024 \* 1024)
> +fi
> +
> +echo "Second block group Data alloc size     = ${SECOND_DATA_CHUNK_SIZE_B}"     >> $seqres.full
> +echo "Second block group Metadata alloc size = ${SECOND_METADATA_CHUNK_SIZE_B}" >> $seqres.full
> +
> +_set_fs_sysfs_attr ${SCRATCH_BDEV} allocation/data/chunk_size ${SECOND_DATA_CHUNK_SIZE_B}
> +_set_fs_sysfs_attr ${SCRATCH_BDEV} allocation/metadata/chunk_size ${SECOND_METADATA_CHUNK_SIZE_B}
> +
> +SECOND_DATA_CHUNK_SIZE_READ_B=$(_get_fs_sysfs_attr ${SCRATCH_BDEV} allocation/data/chunk_size)
> +SECOND_METADATA_CHUNK_SIZE_READ_B=$(_get_fs_sysfs_attr ${SCRATCH_BDEV} allocation/metadata/chunk_size)
> +
> +_set_fs_sysfs_attr ${SCRATCH_BDEV} allocation/data/force_chunk_alloc 1
> +echo "Allocated data chunk" >> $seqres.full
> +_set_fs_sysfs_attr ${SCRATCH_BDEV} allocation/metadata/force_chunk_alloc 1
> +echo "Allocated metadata chunk" >> $seqres.full
> +
> +alloc_size "Data"     SECOND_DATA_SIZE_MB
> +alloc_size "Metadata" SECOND_METADATA_SIZE_MB
> +alloc_size "System"   SECOND_SYSTEM_SIZE_MB
> +
> +echo "Calculate request size so last memory allocation cannot be completely fullfilled."
> +free_space FREE_SPACE_MB
> +
> +# Find request size whose space allocation cannot be completely fullfilled.
> +THIRD_DATA_CHUNK_SIZE_MB=$(expr 256)
> +until [ ${THIRD_DATA_CHUNK_SIZE_MB} -gt $(expr 7 \* 1024) ]; do
> +	if [ $((FREE_SPACE_MB%THIRD_DATA_CHUNK_SIZE_MB)) -ne 0 ]; then
> +		break
> +	fi
> +	THIRD_DATA_CHUNK_SIZE_MB=$((THIRD_DATA_CHUNK_SIZE_MB+256))
> +done
> +
> +if [[ ${THIRD_DATA_CHUNK_SIZE_MB} -eq $(expr 7 \* 1024) ]]; then
> +	_fail "Cannot find allocation size for partial block allocation."
> +fi
> +
> +THIRD_DATA_CHUNK_SIZE_B=$(expr ${THIRD_DATA_CHUNK_SIZE_MB} \* 1024 \* 1024)
> +echo "Allocation size in mb    = ${THIRD_DATA_CHUNK_SIZE_MB}" >> ${seqres}.full
> +echo "Allocation size in bytes = ${THIRD_DATA_CHUNK_SIZE_B}"  >> ${seqres}.full
> +
> +#
> +# Do allocation until free space is exhausted.
> +#
> +echo "Third allocation."
> +_set_fs_sysfs_attr ${SCRATCH_BDEV} allocation/data/chunk_size ${THIRD_DATA_CHUNK_SIZE_B}
> +
> +free_space FREE_SPACE_MB
> +while [ $FREE_SPACE_MB -gt $THIRD_DATA_CHUNK_SIZE_MB ]
> +do
> +	alloc_size "Data" THIRD_DATA_SIZE_MB
> +	_set_fs_sysfs_attr ${SCRATCH_BDEV} allocation/data/force_chunk_alloc 1
> +
> +	free_space FREE_SPACE_MB
> +done
> +
> +alloc_size "Data" FOURTH_DATA_SIZE_MB
> +
> +#
> +# Force chunk allocation of system block type must fail.
> +#
> +echo "Force allocation of system block type must fail."
> +_set_fs_sysfs_attr ${SCRATCH_BDEV} allocation/system/force_chunk_alloc 1 2>/dev/null
> +
> +#
> +# Verification of initial allocation.
> +#
> +echo "Verify first allocation."
> +FIRST_DATA_CHUNK_SIZE_MB=$(expr ${FIRST_DATA_CHUNK_SIZE_B} / 1024 / 1024)
> +FIRST_METADATA_CHUNK_SIZE_MB=$(expr ${FIRST_METADATA_CHUNK_SIZE_B} / 1024 / 1024)
> +
> +# if [[ $(expr ${FIRST_DATA_CHUNK_SIZE_MB} + ${DATA_SIZE_START_MB}) -ne $(expr ${FIRST_DATA_SIZE_MB}) ]]; then
> +if [[ $(expr ${FIRST_DATA_CHUNK_SIZE_MB} + ${DATA_SIZE_START_MB}) -ne ${FIRST_DATA_SIZE_MB} ]]; then
> +	echo "tInitial data allocation not correct."
> +fi
> +
> +if [[ $(expr ${FIRST_METADATA_CHUNK_SIZE_MB} + ${METADATA_SIZE_START_MB}) -ne ${FIRST_METADATA_SIZE_MB} ]]; then
> +	echo "Initial metadata allocation not correct."
> +fi
> +
> +#
> +# Verification of second allocation.
> +#
> +echo "Verify second allocation."
> +SECOND_DATA_CHUNK_SIZE_MB=$(expr ${SECOND_DATA_CHUNK_SIZE_B} / 1024 / 1024)
> +SECOND_METADATA_CHUNK_SIZE_MB=$(expr ${SECOND_METADATA_CHUNK_SIZE_B} / 1024 / 1024)
> +
> +if [[ ${SECOND_DATA_CHUNK_SIZE_B} -ne ${SECOND_DATA_CHUNK_SIZE_READ_B} ]]; then
> +	echo "Value written to allocation/data/chunk_size and read value are different."
> +fi
> +
> +if [[ ${SECOND_METADATA_CHUNK_SIZE_B} -ne ${SECOND_METADATA_CHUNK_SIZE_READ_B} ]]; then
> +	echo "Value written to allocation/metadata/chunk_size and read value are different."
> +fi
> +
> +if [[ $(expr ${SECOND_DATA_CHUNK_SIZE_MB} + ${FIRST_DATA_SIZE_MB}) -ne ${SECOND_DATA_SIZE_MB} ]]; then
> +	echo "Data allocation after chunk size change not correct."
> +fi
> +
> +if [[ $(expr ${SECOND_METADATA_CHUNK_SIZE_MB} + ${FIRST_METADATA_SIZE_MB}) -ne ${SECOND_METADATA_SIZE_MB} ]]; then
> +	echo "Metadata allocation after chunk size change not correct."
> +fi
> +
> +#
> +# Verification of third allocation.
> +#
> +echo "Verify third allocation."
> +if [[ ${FREE_SPACE_MB} -gt ${THIRD_DATA_CHUNK_SIZE_MB} ]]; then
> +	echo "Free space after allocating over memlimit is too high."
> +fi
> +
> +# The + 1 is required as 1MB is always kept as free space.
> +if [[ $(expr ${THIRD_DATA_CHUNK_SIZE_MB} + ${THIRD_DATA_SIZE_MB} + 1) -le $(expr ${FOURTH_DATA_SIZE_MB}) ]]; then
> +	echo "Allocation until out of memory: last memory allocation size is not correct."
> +fi
> +
> +status=0
> +exit
> +
> diff --git a/tests/btrfs/257.out b/tests/btrfs/257.out
> new file mode 100644
> index 00000000..49be3b16
> --- /dev/null
> +++ b/tests/btrfs/257.out
> @@ -0,0 +1,10 @@
> +QA output created by 257
> +Capture default chunk sizes.
> +First allocation.
> +Second allocation.
> +Calculate request size so last memory allocation cannot be completely fullfilled.
> +Third allocation.
> +Force allocation of system block type must fail.
> +Verify first allocation.
> +Verify second allocation.
> +Verify third allocation.
> 
> base-commit: d8dee1222ecdfa1cff1386a61248e587eb3b275d
> -- 
> 2.30.2