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#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2017 Red Hat Inc. All Rights Reserved.
#
# FS QA Test 464
#
# Run delalloc writes & append writes & non-data-integrity syncs concurrently
# to test the race between block map change vs writeback.
#
. ./common/preamble
_begin_fstest auto rw
# Import common functions.
. ./common/filter
MAXFILES=200
BLOCK_SZ=65536
LOOP_CNT=10
LOOP_TIME=5
PROC_CNT=16
stop=$tmp.stop
# get a random file to work on
getfile()
{
echo $SCRATCH_MNT/$((RANDOM % MAXFILES))
}
# delalloc write a relative big file to get enough dirty pages to be written
# back, and XFS needs big enough file to trigger speculative preallocations, so
# freeing these eofblocks could change the extent record
do_write()
{
local blockcount=$((RANDOM % 100))
local filesize=$((blockcount * BLOCK_SZ))
$XFS_IO_PROG -ftc "pwrite -b $BLOCK_SZ 0 $filesize" `getfile` \
>/dev/null 2>&1
}
# append another dirty page to the file, the writeback might pick it up too if
# the file is already under writeback
do_append()
{
echo "test string" >> `getfile`
}
# issue WB_SYNC_NONE writeback with the '-w' option of sync_range xfs_io
# command, so that the last dirty page from append write can be picked up in
# this writeback cycle. This is not mandatory but could help reproduce XFS
# corruption more easily.
do_writeback()
{
$XFS_IO_PROG -c "sync_range -w 0 0" `getfile` >/dev/null 2>&1
}
# real QA test starts here
_supported_fs generic
# do fsck after each iteration in test
_require_scratch_nocheck
_require_xfs_io_command "sync_range"
_scratch_mkfs >>$seqres.full 2>&1
_scratch_mount
# loop for $LOOP_CNT iterations, and each iteration starts $PROC_CNT processes
# for each operation and runs for $LOOP_TIME seconds, and check filesystem
# consistency after each iteration
for i in `seq 1 $LOOP_CNT`; do
rm -f $stop
for j in `seq 1 $PROC_CNT`; do
while [ ! -e $stop ]; do
do_write
done &
while [ ! -e $stop ]; do
do_append
done &
while [ ! -e $stop ]; do
do_writeback
done &
done
sleep $LOOP_TIME
touch $stop
wait
_scratch_unmount
# test exits here if fs is inconsistent
_check_scratch_fs
_scratch_mount
done
echo "Silence is golden"
# success, all done
status=0
exit
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