mirror of
https://github.com/linux-apfs/apfstests.git
synced 2026-05-01 15:01:44 -07:00
Dave Chinner
1ff4192932
Fully scripted conversion, see script in initial SPDX license commit message. Signed-off-by: Dave Chinner <dchinner@redhat.com>
83 lines
2.1 KiB
Bash
Executable File
83 lines
2.1 KiB
Bash
Executable File
#! /bin/bash
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# SPDX-License-Identifier: GPL-2.0
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# Copyright (c) 2017 Facebook. All Rights Reserved.
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#
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# FS QA Test 138
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#
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# Test decompression in the middle of large extents. Regression test for Linux
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# kernel commit 6e78b3f7a193 ("Btrfs: fix btrfs_decompress_buf2page()").
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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 $seqres.full
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# real QA test starts here
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_supported_fs btrfs
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_supported_os Linux
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_require_scratch
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_require_btrfs_command property
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algos=($(_btrfs_compression_algos))
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_scratch_mkfs >>$seqres.full 2>&1
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_scratch_mount
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# Need 1GB for the uncompressed file plus <1GB for each compressed file.
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_require_fs_space $SCRATCH_MNT $((1024 * 1024 * (1 + ${#algos[@]})))
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# Checksum a piece in the middle of the file. This hits the unaligned case that
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# caused the original bug.
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do_csum()
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{
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dd if="$1" bs=4K skip=555 count=100 2>>$seqres.full| md5sum | cut -d ' ' -f 1
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}
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# Create a large, uncompressed (but compressible) file.
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touch "${SCRATCH_MNT}/uncompressed"
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$BTRFS_UTIL_PROG property set "${SCRATCH_MNT}/uncompressed" compression ""
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_ddt of="${SCRATCH_MNT}/uncompressed" bs=1M count=1K 2>&1 | _filter_dd
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csum="$(do_csum "${SCRATCH_MNT}/uncompressed")"
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for algo in ${algos[@]}; do
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echo "Testing ${algo}" >> $seqres.full
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# Copy the same data, but with compression enabled.
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touch "${SCRATCH_MNT}/${algo}"
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$BTRFS_UTIL_PROG property set "${SCRATCH_MNT}/${algo}" compression "${algo}"
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dd if="${SCRATCH_MNT}/uncompressed" of="${SCRATCH_MNT}/${algo}" bs=1M 2>&1 | _filter_dd
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# The correct data is likely still cached. Cycle the mount to drop the
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# cache and start fresh.
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_scratch_cycle_mount
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# Check the checksum.
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compressed_csum="$(do_csum "${SCRATCH_MNT}/${algo}")"
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if [ "${compressed_csum}" != "${csum}" ]; then
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echo "Checksum mismatch for ${algo} (expected ${csum}, got ${compressed_csum})"
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fi
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done
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echo "Silence is golden"
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status=0
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exit
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