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#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2024 Western Digital Corporation. All Rights Reserved.
#
# FS QA Test No. 747
#
# Inspired by btrfs/273 and generic/015
#
# This test stresses garbage collection in file systems
# by first filling up a scratch mount to a specific usage point with
# files of random size, then doing overwrites in parallel with
# deletes to fragment the backing zones, forcing reclaim.
. ./common/preamble
_begin_fstest auto
# real QA test starts here
_supported_fs generic
_require_scratch
# This test requires specific data space usage, skip if we have compression
# enabled.
_require_no_compress
M=$((1024 * 1024))
min_fsz=$((1 * ${M}))
max_fsz=$((256 * ${M}))
bs=${M}
fill_percent=95
overwrite_percentage=20
testseq=0
_create_file() {
local file_name=${SCRATCH_MNT}/data_$1
local file_sz=$2
local dd_extra=$3
POSIXLY_CORRECT=yes dd if=/dev/zero of=${file_name} \
bs=${bs} count=$(( $file_sz / ${bs} )) \
status=none $dd_extra 2>&1
if [ $? -ne 0 ]; then
_fail "Failed writing $file_name"
fi
}
_total_M() {
local total=$(stat -f -c '%b' ${SCRATCH_MNT})
local bs=$(stat -f -c '%S' ${SCRATCH_MNT})
echo $(( ${total} * ${bs} / ${M}))
}
_used_percent() {
local available=$(stat -f -c '%a' ${SCRATCH_MNT})
local total=$(stat -f -c '%b' ${SCRATCH_MNT})
echo $((100 - (100 * ${available}) / ${total} ))
}
_delete_random_file() {
local to_delete=$(find ${SCRATCH_MNT} -type f | shuf | head -1)
rm $to_delete
sync ${SCRATCH_MNT}
}
_get_random_fsz() {
local r=$RANDOM
echo $(( ${min_fsz} + (${max_fsz} - ${min_fsz}) * (${r} % 100) / 100 ))
}
_direct_fillup () {
while [ $(_used_percent) -lt $fill_percent ]; do
local fsz=$(_get_random_fsz)
_create_file $testseq $fsz "oflag=direct conv=fsync"
testseq=$((${testseq} + 1))
done
}
_mixed_write_delete() {
local dd_extra=$1
local total_M=$(_total_M)
local to_write_M=$(( ${overwrite_percentage} * ${total_M} / 100 ))
local written_M=0
while [ $written_M -lt $to_write_M ]; do
if [ $(_used_percent) -lt $fill_percent ]; then
local fsz=$(_get_random_fsz)
_create_file $testseq $fsz "$dd_extra"
written_M=$((${written_M} + ${fsz}/${M}))
testseq=$((${testseq} + 1))
else
_delete_random_file
fi
done
}
seed=$RANDOM
RANDOM=$seed
echo "Running test with seed=$seed" >>$seqres.full
_scratch_mkfs_sized $((8 * 1024 * 1024 * 1024)) &>>$seqres.full
_scratch_mount
echo "Starting fillup using direct IO"
_direct_fillup
echo "Starting mixed write/delete test using direct IO"
_mixed_write_delete "oflag=direct"
echo "Starting mixed write/delete test using buffered IO"
_mixed_write_delete ""
echo "Syncing"
sync ${SCRATCH_MNT}/*
echo "Done, all good"
# success, all done
status=0
exit
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