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#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2017 Plexistor Ltd. All Rights Reserved.
#
# FS QA Test No. 415
#
# test for races between write or fpunch operations on reflinked files
# to read operations on the target file
#
. ./common/preamble
_begin_fstest auto clone punch
status=0 # success is the default!
# Import common functions.
. ./common/reflink
# real QA test starts here
_supported_fs generic
_require_scratch_reflink
_require_cp_reflink
_require_xfs_io_command "fpunch"
_scratch_mkfs >> $seqres.full 2>&1 || _fail "mkfs failed"
_scratch_mount || _fail "mount failed"
_require_fs_space $SCRATCH_MNT $((250 * 1024))
echo "Silence is golden"
workfile=${SCRATCH_MNT}/workfile
light_clone=${SCRATCH_MNT}/light_clone
file_size=$((10 * 1024 * 1024))
bs=`_get_block_size $SCRATCH_MNT`
block_num=$((file_size / bs))
reflinks_num=20
$XFS_IO_PROG -f -c "pwrite 0 $file_size" $workfile >> $seqres.full
for ((i=1; i<=reflinks_num; i++)); do
_cp_reflink $workfile ${light_clone}_$i
done
# for each block simultaneously pwrite (or fpunch) all reflinks
# while performing pread from the targted file
for ((block_index=0; block_index<block_num; block_index++)); do
for ((i=1; i<=reflinks_num; i++)); do
$XFS_IO_PROG -c "pread $((block_index * bs)) $bs" \
$workfile >> $seqres.full &
if [ $((block_index % 2)) -eq 0 ]; then
$XFS_IO_PROG -c "pwrite $((block_index * bs)) $bs" \
${light_clone}_$i >> $seqres.full &
else
$XFS_IO_PROG -c "fpunch $((block_index * bs)) $bs" \
${light_clone}_$i >> $seqres.full &
fi
done
# wait for all threads to join before moving to next block
wait
done
# success, all done
status=0
exit
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