#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2017 Intel Corporation.  All Rights Reserved.
#
# FS QA Test No. 470
#
# Use dm-log-writes to verify that MAP_SYNC actually syncs metadata during
# page faults.
#
. ./common/preamble
_begin_fstest auto quick dax

# Override the default cleanup function.
_cleanup()
{
	cd /
	_log_writes_cleanup
	rm -f $tmp.*
}

# Import common functions.
. ./common/filter
. ./common/dmlogwrites

# real QA test starts here
_supported_fs generic
_require_scratch
_require_no_logdev
_require_log_writes_dax_mountopt "dax"
_require_xfs_io_command "mmap" "-S"
_require_xfs_io_command "log_writes"
_require_command "$BLKDISCARD_PROG" blkdiscard

MAPPED_LEN=$((512 * 1024 * 1024)) # 512 MiB
LEN=$((1024 * 1024)) # 1 MiB

_log_writes_init $SCRATCH_DEV $MAPPED_LEN
_log_writes_mkfs >> $seqres.full 2>&1
_log_writes_mount -o dax

$XFS_IO_PROG -t -c "truncate $LEN" -c "mmap -S 0 $LEN" -c "mwrite 0 $LEN" \
	-c "log_writes -d $LOGWRITES_NAME -m preunmap" \
	-f $SCRATCH_MNT/test

# Unmount the scratch dir and tear down the log writes target
_log_writes_unmount
_log_writes_remove
_check_scratch_fs

# Forcibly zero the mapped range of scratch device and destroy
# previous filesystem so we can be sure our rebuild works.
# Note that blkdiscard -z will fall back to writing buffers of zeroes
# if scratch device doesn't support write zeroes operation(i.e.
# REQ_OP_WRITE_ZEROES).
$BLKDISCARD_PROG -fzl $MAPPED_LEN $SCRATCH_DEV >> $seqres.full 2>&1
_scratch_mkfs >> $seqres.full 2>&1

# check pre-unmap state
_log_writes_replay_log preunmap $SCRATCH_DEV
_scratch_mount

# We should see $SCRATCH_MNT/test as having 1 MiB in block allocations
du -sh $SCRATCH_MNT/test | _filter_scratch | _filter_spaces

status=0
exit