mirror of
https://github.com/linux-apfs/apfstests.git
synced 2026-05-01 15:01:44 -07:00
Darrick J. Wong
a860a167d8
fstests only supports Linux, so get rid of this unnecessary predicate. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Eryu Guan <guaneryu@gmail.com>
101 lines
2.7 KiB
Bash
Executable File
101 lines
2.7 KiB
Bash
Executable File
#! /bin/bash
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# SPDX-License-Identifier: GPL-2.0
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# Copyright (C) 2019 SUSE Linux Products GmbH. All Rights Reserved.
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#
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# FS QA Test 181
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#
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# Test if btrfs will commit too many transactions for nothing and cause
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# performance regression during balance.
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#
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# This bug is going to be fixed by a patch for kernel title
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# "btrfs: don't end the transaction for delayed refs in throttle"
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#
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seq=`basename $0`
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seqres=$RESULT_DIR/$seq
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echo "QA output created by $seq"
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here=`pwd`
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tmp=/tmp/$$
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status=1 # failure is the default!
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trap "_cleanup; exit \$status" 0 1 2 3 15
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_cleanup()
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{
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cd /
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rm -f $tmp.*
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}
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# get standard environment, filters and checks
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. ./common/rc
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. ./common/filter
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# remove previous $seqres.full before test
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rm -f $seqres.full
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# real QA test starts here
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# Modify as appropriate.
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_supported_fs btrfs
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_require_scratch
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_require_btrfs_command inspect-internal dump-super
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_scratch_mkfs > /dev/null
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_scratch_mount
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nr_files=1024
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get_super_gen()
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{
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local ret=$($BTRFS_UTIL_PROG inspect dump-super "$SCRATCH_DEV" |\
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grep ^generation | awk '{print $2}')
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if [ -z $ret ]; then
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_fail "failed to get super block generation"
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fi
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echo "$ret"
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}
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$BTRFS_UTIL_PROG subvolume create "$SCRATCH_MNT/subvol" > /dev/null
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# Create some small files to take up enough metadata reserved space
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for ((i = 0; i < $nr_files; i++)) do
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_pwrite_byte 0xcd 0 1K "$SCRATCH_MNT/subvol/file_$i" > /dev/null
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done
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# Commit the fs so we can get a stable super generation
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sync
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before_gen=$(get_super_gen)
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_run_btrfs_balance_start -m $SCRATCH_MNT >> $seqres.full
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after_gen=$(get_super_gen)
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# Since the fs is pretty small, we should have only 1 small metadata chunk and
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# one tiny system chunk.
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# Relocating such small chunks only needs 6 commits for each, thus 12 commits for
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# 2 chunks.
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# Here we use 10x the theoretic value as threshold.
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theoretic_gen=$(( 6 * 2 ))
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threshold_gen=$(( 10 * $theoretic_gen ))
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if [ $(( $after_gen - $before_gen )) -gt 120 ]; then
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echo "balance committed too many transactions"
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echo "super generation before balance: ${before_gen}"
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echo "super generation after balance: ${after_gen}"
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echo "super generation difference: $((after_gen - before_gen))"
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echo "theoretic generation difference: ${theoretic_gen}"
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echo "threshold generation difference: ${threshold_gen}"
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fi
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echo "super generation before balance: ${before_gen}" >> $seqres.full
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echo "super generation after balance: ${after_gen}" >> $seqres.full
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echo "super generation difference: $((after_gen - before_gen))" >> $seqres.full
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echo "theoretic generation difference: ${theoretic_gen}" >> $seqres.full
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echo "threshold generation difference: ${threshold_gen}" >> $seqres.full
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# success, all done
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echo "Silence is golden"
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status=0
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exit
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