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Filipe Manana
53fc54907b
Regression test for read corruption of compressed and shared extents after punching holes into a file. The same extent is shared by the same file in consecutive ranges (without other extents in between). This is motivated by a bug recently found in btrfs for which there is a patch for the linux kernel titled: "Btrfs: fix corruption reading shared and compressed extents after hole punching" Signed-off-by: Filipe Manana <fdmanana@suse.com> Reviewed-by: Eryu Guan <guaneryu@gmail.com> Signed-off-by: Eryu Guan <guaneryu@gmail.com>
77 lines
2.0 KiB
Bash
Executable File
77 lines
2.0 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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# FSQA Test No. 183
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#
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# Regression test for read corruption of compressed and shared extents after
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# punching holes into a file.
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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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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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. ./common/reflink
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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_reflink
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_require_xfs_io_command "fpunch"
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rm -f $seqres.full
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_scratch_mkfs >>$seqres.full 2>&1
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_scratch_mount "-o compress"
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# Create a file with 3 consecutive compressed extents, each corresponds to 128Kb
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# of data (uncompressed size) and each is stored on disk as a 4Kb extent
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# (compressed size, regardless of compression algorithm used).
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# Each extent starts with 4Kb of zeroes, while the remaining bytes all have a
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# value of 0xff.
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$XFS_IO_PROG -f -c "pwrite -S 0xff 0 384K" \
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-c "pwrite -S 0x00 0 4K" \
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-c "pwrite -S 0x00 128K 4K" \
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-c "pwrite -S 0x00 256K 4K" \
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$SCRATCH_MNT/foobar | _filter_xfs_io
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echo "File digest after initial creation:"
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md5sum $SCRATCH_MNT/foobar | _filter_scratch
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# Clone the first extent into offsets 128K and 256K.
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$XFS_IO_PROG -c "reflink $SCRATCH_MNT/foobar 0 128K 128K" \
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-c "reflink $SCRATCH_MNT/foobar 0 256K 128K" \
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$SCRATCH_MNT/foobar | _filter_xfs_io
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echo "File digest after reflinking:"
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md5sum $SCRATCH_MNT/foobar | _filter_scratch
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# Punch holes into the regions that are already full of zeroes.
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$XFS_IO_PROG -c "fpunch 0 4K" \
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-c "fpunch 128K 4K" \
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-c "fpunch 256K 4K" \
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$SCRATCH_MNT/foobar
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echo "File digest after punching holes:"
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md5sum $SCRATCH_MNT/foobar | _filter_scratch
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echo 1 > /proc/sys/vm/drop_caches
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echo "File digest after dropping page cache:"
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md5sum $SCRATCH_MNT/foobar | _filter_scratch
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status=0
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exit
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