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https://github.com/linux-apfs/apfstests.git
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98 lines
3.0 KiB
Bash
98 lines
3.0 KiB
Bash
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#! /bin/bash
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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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#-----------------------------------------------------------------------
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#
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# Copyright (C) 2015 SUSE Linux Products GmbH. All Rights Reserved.
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# Author: Filipe Manana <fdmanana@suse.com>
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License as
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# published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it would be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write the Free Software Foundation,
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# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#-----------------------------------------------------------------------
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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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_need_to_be_root
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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 $mount_opts
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# Create our test file with a single extent of 64Kb that is going to be
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# compressed no matter which compression algorithm is used (zlib/lzo).
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$XFS_IO_PROG -f -c "pwrite -S 0xaa 0K 64K" \
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$SCRATCH_MNT/foo | _filter_xfs_io
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# Now clone the compressed extent into an adjacent file offset.
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$CLONER_PROG -s 0 -d $((64 * 1024)) -l $((64 * 1024)) \
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$SCRATCH_MNT/foo $SCRATCH_MNT/foo
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echo "File digest before unmount:"
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md5sum $SCRATCH_MNT/foo | _filter_scratch
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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
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# 16 pages, all the pages belonging to the second range of the file
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# (64K to 128K), which points to the same extent as the first range
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# (0K to 64K), had their contents full of zeroes instead of the byte
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# 0xaa. This was a bug exclusively in the read path of compressed
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# extents, the correct data was stored on disk, btrfs just failed to
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# fill in the pages correctly.
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_scratch_remount
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echo "File digest after remount:"
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# Must match the digest we got before.
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md5sum $SCRATCH_MNT/foo | _filter_scratch
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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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