mirror of
https://github.com/linux-apfs/apfstests.git
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Eryu Guan
9953b149b5
Test if direct write invalidates pagecache correctly, so that
subsequent buffer read reads the correct data from disk.
This test is inspired by LTP tests dio29, and serves as a regression
test for the bug found by it, see kernel commit c771c14baa33
("iomap: invalidate page caches should be after iomap_dio_complete()
in direct write").
The test can be easily expanded to other write/read combinations,
e.g. buffer write + direct read and direct write + direct read, so
they are also being tested.
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>
123 lines
3.1 KiB
Bash
Executable File
123 lines
3.1 KiB
Bash
Executable File
#! /bin/bash
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# FS QA Test 418
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#
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# Test pagecache invalidation in buffer/direct write/read combination.
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#
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# Fork N children, each child writes to and reads from its own region of the
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# same test file, and check if what it reads is what it writes. The test region
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# is determined by N * blksz. Write and read operation can be either direct or
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# buffered.
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#
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# Regression test for commit c771c14baa33 ("iomap: invalidate page caches
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# should be after iomap_dio_complete() in direct write")
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#
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#-----------------------------------------------------------------------
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# Copyright (c) 2017 Red Hat Inc. All Rights Reserved.
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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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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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# remove previous $seqres.full before test
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rm -f $seqres.full
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# real QA test starts here
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_supported_fs generic
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_supported_os Linux
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_require_test
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_require_odirect
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_require_block_device $TEST_DEV
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_require_test_program "dio-invalidate-cache"
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_require_test_program "feature"
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diotest=$here/src/dio-invalidate-cache
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testfile=$TEST_DIR/$seq-diotest
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sectorsize=`blockdev --getss $TEST_DEV`
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pagesize=`src/feature -s`
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# test case array, test different write/read combinations
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# -r: use direct read
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# -w: use direct write
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# -t: truncate file to final size before test, i.e. write to hole
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# -p: fallocate whole file before test, i.e. write to allocated but unwritten extents
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# -F: fulfill whole file before test, i.e. write to allocated & written extents
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t_cases=(
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"-w"
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"-wt"
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"-wp"
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"-wF"
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"-r"
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"-rt"
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"-rp"
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"-rF"
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"-rw"
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"-rwt"
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"-rwp"
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"-rwF"
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)
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runtest()
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{
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local i=0
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local tc=""
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local loop=$1
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shift
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for tc in ${t_cases[*]}; do
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echo "diotest $tc $*" >> $seqres.full
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i=0
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while [ $i -lt $loop ]; do
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$diotest $tc $* -f $testfile
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if [ $? -ne 0 ]; then
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echo "diotest $tc $* failed at loop $i" | \
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tee -a $seqres.full
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break
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fi
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let i=i+1
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done
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done
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}
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while [ $sectorsize -le $((pagesize * 2)) ]; do
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# reproducer for the original bug
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runtest $((10 * LOAD_FACTOR)) -b $sectorsize -n 3 -i 1
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# try more processes and iterations
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runtest $((5 * LOAD_FACTOR)) -b $sectorsize -n 8 -i 4
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sectorsize=$((sectorsize * 2))
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done
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echo "Silence is golden"
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# success, all done
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status=0
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exit
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