2015-05-04 22:56:13 +10:00
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#! /bin/bash
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2018-06-09 11:35:42 +10:00
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# SPDX-License-Identifier: GPL-2.0
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# Copyright (c) 2015 Red Hat, Inc., Lukas Czerner <lczerner@redhat.com>
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#
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2015-05-04 22:56:13 +10:00
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# FS QA Test 086
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#
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# This test excercises the problem with unwritten and delayed extents
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# in ext4 extent status tree where we might in some cases lose a block
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# worth of data. Even though this was a ext4 specific problem the
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# reproducer can be easily tun on any file system so let's do that just
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# in case.
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#
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# This tests excercises the problem fixed in kernel with commit
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# "ext4: Fix data corruption caused by unwritten and delayed extents"
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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 $tmp.*
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}
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# get standard environment, filters and checks
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. ./common/rc
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. ./common/filter
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# real QA test starts here
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# Modify as appropriate.
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_supported_fs generic
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2017-07-20 21:22:05 -07:00
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_supported_os Linux
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2015-05-04 22:56:13 +10:00
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_require_test
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_require_xfs_io_command "falloc"
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test_file=${TEST_DIR}/testfile-$seq
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rm -f $test_file
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# The first write creates a delayed extent, fallocate creates
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# unwritten extent which will be marked as delayed in ext4
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# extent status tree. Second write will convert unwritten/delayed
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# block into written/delayed.
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$XFS_IO_PROG -f -c "pwrite -S 0xaa 4096 2048" \
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-c "falloc 0 131072" \
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-c "pwrite -S 0xbb 65536 2048" \
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-c "fsync" $test_file > $seqres.full 2>&1
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# Drop the caches to evict dirty buffers from memory
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echo 3 > /proc/sys/vm/drop_caches
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# Write into the second part of the block with 0xbb write from before
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# will create new empty! buffer because the block is still marked as
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# delayed even though it's already written - resulting in
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# overwriting previous data.
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$XFS_IO_PROG -c "pwrite -S 0xdd 67584 2048" $test_file >> $seqres.full 2>&1
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# On a faulty ext4 oxbb data will be missing, overwritten by zeroes.
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hexdump -C $test_file
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# success, all done
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status=0
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exit
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