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Xiao Yang
ff5eca9b68
This test reproduces a race between a direct I/O read and
a mapped write to a hole in a file. On xfs filesystem, it
will trigger a BUG_ON(), and this XFS bug has been fixed by:
04197b3 ("xfs: don't BUG() on mixed direct and mapped I/O")
[ eguan: umount before check dmesg log, and add rw group ]
Signed-off-by: Xiao Yang <yangx.jy@cn.fujitsu.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>
92 lines
2.5 KiB
Bash
Executable File
92 lines
2.5 KiB
Bash
Executable File
#! /bin/bash
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# FS QA Test No. 446
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#
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# Regression test for commit:
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# 04197b3 ("xfs: don't BUG() on mixed direct and mapped I/O")
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#
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# This case tests a race between a direct I/O read and a
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# mapped write to a hole in a file. On xfs filesystem, it
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# will trigger a BUG_ON().
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#
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#-----------------------------------------------------------------------
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# Copyright (c) 2017 Fujitsu. All Rights Reserved.
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# Author: Xiao Yang <yangx.jy@cn.fujitsu.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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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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rm -rf $tmp.*
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}
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# get standard environment and checks
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. ./common/rc
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# real QA test starts here
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_supported_os Linux
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_require_scratch
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_require_xfs_io_command "truncate"
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_require_xfs_io_command "fpunch"
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rm -f $seqres.full
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# format and mount
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_scratch_mkfs > $seqres.full 2>&1
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_scratch_mount >> $seqres.full 2>&1
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filesz=$((65536 * 2))
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# create a test file with a hole
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$XFS_IO_PROG -f -c "truncate $((filesz * 2))" $SCRATCH_MNT/file >> $seqres.full
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# run a background dio read to a hole in a loop
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while true; do
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$XFS_IO_PROG -d -c "pread 0 $filesz" $SCRATCH_MNT/file > /dev/null 2>&1
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done &
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dread_pid=$!
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# run mapped write to the same hole as dio read
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for i in `seq 0 999`; do
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$XFS_IO_PROG -c "mmap 0 $filesz" -c "mwrite 0 $filesz" $SCRATCH_MNT/file \
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> /dev/null
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$XFS_IO_PROG -c "fpunch 0 $filesz" $SCRATCH_MNT/file > /dev/null
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done
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kill -9 $dread_pid > /dev/null 2>&1
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wait $dread_pid > /dev/null 2>&1
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echo "Silence is golden"
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# check dmesg, filtering out expected XFS warnings about mixed mmap/dio
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# and umount first in case umount triggers warnings
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_scratch_unmount
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if [ "$FSTYP" == "xfs" ]; then
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_check_dmesg _filter_xfs_dmesg
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else
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_check_dmesg
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fi
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status=$?
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exit
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