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#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2017 Red Hat Inc. All Rights Reserved.
#
# FS QA Test 418
#
# Test pagecache invalidation in buffer/direct write/read combination.
#
# Fork N children, each child writes to and reads from its own region of the
# same test file, and check if what it reads is what it writes. The test region
# is determined by N * blksz. Write and read operation can be either direct or
# buffered.
#
# Regression test for commit c771c14baa33 ("iomap: invalidate page caches
# should be after iomap_dio_complete() in direct write")
#
. ./common/preamble
_begin_fstest auto rw
# Import common functions.
. ./common/filter
# real QA test starts here
_supported_fs generic
_require_test
_require_odirect
_require_block_device $TEST_DEV
_require_test_program "dio-invalidate-cache"
_require_test_program "feature"
diotest=$here/src/dio-invalidate-cache
testfile=$TEST_DIR/$seq-diotest
sectorsize=`blockdev --getss $TEST_DEV`
pagesize=`$here/src/feature -s`
# test case array, test different write/read combinations
# -r: use direct read
# -w: use direct write
# -t: truncate file to final size before test, i.e. write to hole
# -p: fallocate whole file before test, i.e. write to allocated but unwritten extents
# -F: fulfill whole file before test, i.e. write to allocated & written extents
t_cases=(
"-w"
"-wt"
"-wp"
"-wF"
"-r"
"-rt"
"-rp"
"-rF"
"-rw"
"-rwt"
"-rwp"
"-rwF"
)
runtest()
{
local i=0
local tc=""
local loop=$1
shift
for tc in ${t_cases[*]}; do
echo "diotest $tc $*" >> $seqres.full
i=0
while [ $i -lt $loop ]; do
$diotest $tc $* -f $testfile
if [ $? -ne 0 ]; then
echo "diotest $tc $* failed at loop $i" | \
tee -a $seqres.full
break
fi
let i=i+1
done
done
}
while [ $sectorsize -le $((pagesize * 2)) ]; do
# reproducer for the original bug
runtest $((10 * LOAD_FACTOR)) -b $sectorsize -n 3 -i 1
# try more processes and iterations
runtest $((5 * LOAD_FACTOR)) -b $sectorsize -n 8 -i 4
sectorsize=$((sectorsize * 2))
done
echo "Silence is golden"
# success, all done
status=0
exit
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