mirror of
https://github.com/linux-apfs/apfstests.git
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Dave Chinner
cf89aed924
Fully scripted conversion, see script in initial SPDX license commit message. Signed-off-by: Dave Chinner <dchinner@redhat.com>
97 lines
2.0 KiB
Bash
Executable File
97 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) 2014 Red Hat, Inc. All Rights Reserved.
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#
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# FS QA Test No. 032
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#
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# This test implements a data corruption scenario on XFS filesystems with
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# sub-page sized blocks and unwritten extents. Inode lock contention during
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# writeback of pages to unwritten extents leads to failure to convert those
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# extents on I/O completion. This causes data corruption as unwritten extents
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# are always read back as zeroes.
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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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kill -9 $syncpid > /dev/null 2>&1
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wait
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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/punch
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# real QA test starts here
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rm -f $seqres.full
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_syncloop()
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{
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while [ true ]; do
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sync
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done
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}
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# Modify as appropriate.
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_supported_fs generic
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_supported_os Linux
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_require_scratch
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_require_xfs_io_command "falloc"
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_require_xfs_io_command "fiemap"
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_scratch_mkfs >/dev/null 2>&1
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_scratch_mount
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# run background sync thread
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_syncloop &
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syncpid=$!
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for iters in $(seq 1 100)
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do
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rm -f $SCRATCH_MNT/file
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# create a delalloc block in each page of the first 64k of the file
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for pgoff in $(seq 0 0x1000 0xf000); do
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offset=$((pgoff + 0xc00))
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$XFS_IO_PROG -f \
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-c "pwrite $offset 0x1" \
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$SCRATCH_MNT/file >> $seqres.full 2>&1
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done
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# preallocate the first 64k and overwite, writing past 64k to contend
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# with writeback
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$XFS_IO_PROG \
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-c "falloc 0 0x10000" \
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-c "pwrite 0 0x100000" \
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-c "fsync" \
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$SCRATCH_MNT/file >> $seqres.full 2>&1
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# Check for unwritten extents. We should have none since we wrote over
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# the entire preallocated region and ran fsync.
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$XFS_IO_PROG -c "fiemap -v" $SCRATCH_MNT/file | \
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tee -a $seqres.full | \
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_filter_fiemap | grep unwritten
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[ $? == 0 ] && _fail "Unwritten extents found!"
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done
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echo $iters iterations
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kill $syncpid
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wait
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# clear page cache and dump the file
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_scratch_cycle_mount
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hexdump $SCRATCH_MNT/file
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status=0
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exit
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