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https://github.com/linux-apfs/apfstests.git
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Dave Chinner
1ff4192932
Fully scripted conversion, see script in initial SPDX license commit message. Signed-off-by: Dave Chinner <dchinner@redhat.com>
84 lines
2.4 KiB
Bash
Executable File
84 lines
2.4 KiB
Bash
Executable File
#! /bin/bash
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# SPDX-License-Identifier: GPL-2.0
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# Copyright (C) 2015 SUSE Linux Products GmbH. All Rights Reserved.
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#
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# FSQA Test No. 106
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#
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# Regression test for file read corruption when using compressed extents
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# that represent file ranges with a length that is a multiple of 16 pages
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# and that are shared by multiple consecutive ranges of the same 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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# 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_cloner
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rm -f $seqres.full
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test_clone_and_read_compressed_extent()
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{
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local mount_opts=$1
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_scratch_mkfs >>$seqres.full 2>&1
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_scratch_mount $mount_opts
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PAGE_SIZE=$(get_page_size)
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# Create our test file with 16 pages worth of data in a single extent
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# that is going to be compressed no matter which compression algorithm
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# is used (zlib/lzo).
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$XFS_IO_PROG -f -c "pwrite -S 0xaa 0K $((16 * $PAGE_SIZE))" \
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$SCRATCH_MNT/foo | _filter_xfs_io_pages_modified
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# Now clone the compressed extent into an adjacent file offset.
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$CLONER_PROG -s 0 -d $((16 * $PAGE_SIZE)) -l $((16 * $PAGE_SIZE)) \
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$SCRATCH_MNT/foo $SCRATCH_MNT/foo
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echo "File contents before unmount:"
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od -t x1 $SCRATCH_MNT/foo | _filter_od
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# Remount the fs or clear the page cache to trigger the bug in btrfs.
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# Because the extent has an uncompressed length that is a multiple of 16
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# pages, all the pages belonging to the second range of the file that is
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# mapped by the page index range [16, 31], which points to the same
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# extent as the first file range mapped by the page index range [0, 15],
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# had their contents full of zeroes instead of the byte 0xaa. This was a
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# bug exclusively in the read path of compressed extents, the correct
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# data was stored on disk, btrfs just failed to fill in the pages
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# correctly.
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_scratch_cycle_mount
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echo "File contents after remount:"
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# Must match the digest we got before.
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od -t x1 $SCRATCH_MNT/foo | _filter_od
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}
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echo -e "\nTesting with zlib compression..."
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test_clone_and_read_compressed_extent "-o compress=zlib"
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_scratch_unmount
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echo -e "\nTesting with lzo compression..."
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test_clone_and_read_compressed_extent "-o compress=lzo"
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status=0
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exit
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