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#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2014 Red Hat, Inc. All Rights Reserved.
#
# FS QA Test No. 032
#
# This test implements a data corruption scenario on XFS filesystems with
# sub-page sized blocks and unwritten extents. Inode lock contention during
# writeback of pages to unwritten extents leads to failure to convert those
# extents on I/O completion. This causes data corruption as unwritten extents
# are always read back as zeroes.
#
. ./common/preamble
_begin_fstest auto quick rw fiemap prealloc
# Override the default cleanup function.
_cleanup()
{
cd /
kill -9 $syncpid > /dev/null 2>&1
wait
rm -f $tmp.*
}
# Import common functions.
. ./common/punch
# real QA test starts here
_syncloop()
{
while [ true ]; do
sync
done
}
# Modify as appropriate.
_supported_fs generic
_require_scratch
_require_xfs_io_command "falloc"
_require_xfs_io_command "fiemap"
_scratch_mkfs >/dev/null 2>&1
_scratch_mount
# run background sync thread
_syncloop &
syncpid=$!
for iters in $(seq 1 100)
do
rm -f $SCRATCH_MNT/file
# create a delalloc block in each page of the first 64k of the file
for pgoff in $(seq 0 0x1000 0xf000); do
offset=$((pgoff + 0xc00))
$XFS_IO_PROG -f \
-c "pwrite $offset 0x1" \
$SCRATCH_MNT/file >> $seqres.full 2>&1
done
# preallocate the first 64k and overwite, writing past 64k to contend
# with writeback
file_len=0x100000
$XFS_IO_PROG \
-c "falloc 0 0x10000" \
-c "pwrite 0 $file_len" \
-c "fsync" \
$SCRATCH_MNT/file >> $seqres.full 2>&1
# Check for unwritten extents. We should have none before EOF since we
# wrote over the entire preallocated region and ran fsync.
eof_sector=$(( file_len / 512 ))
$XFS_IO_PROG -c 'fiemap -v' $SCRATCH_MNT/file | \
_filter_fiemap | \
tr '[.]:' ' ' | \
awk "{if (\$2 < $eof_sector) {print \$0}}" | \
grep -q unwritten && _fail "Unwritten extents found!"
done
echo $iters iterations
kill $syncpid
wait
# clear page cache and dump the file
_scratch_cycle_mount
_hexdump $SCRATCH_MNT/file
status=0
exit
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