#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2023 SUSE Linux Products GmbH. All Rights Reserved.
#
# FS QA Test 286
#
# Make sure btrfs dev-replace on missing device won't cause data corruption
# for NODATASUM data.
#
. ./common/preamble
_begin_fstest auto replace

. ./common/filter

_supported_fs btrfs
_require_command "$WIPEFS_PROG" wipefs
_btrfs_get_profile_configs replace-missing
_require_fssum
_require_scratch_dev_pool 5
_scratch_dev_pool_get 4
_spare_dev_get

workload()
{
	local profile=$1
	local victim="$(echo $SCRATCH_DEV_POOL | $AWK_PROG '{print $2}')"

	echo "=== Profile: $profile ===" >> $seqres.full
	rm -f $tmp.fssum
	_scratch_pool_mkfs "$profile" >> $seqres.full 2>&1

	# Use nodatasum mount option, so all data won't have checksum.
	_scratch_mount -o nodatasum

	$FSSTRESS_PROG -p 10 -n 200 -d $SCRATCH_MNT >> $seqres.full
	sync

	# Generate fssum for later verification, here we only care
	# about the file contents, thus we don't bother metadata at all.
	$FSSUM_PROG -n -d -f -w $tmp.fssum $SCRATCH_MNT
	_scratch_unmount

	# Wipe devid 2
	$WIPEFS_PROG -a $victim >> $seqres.full 2>&1

	# Mount the fs with the victim device missing
	_scratch_mount -o degraded,nodatasum

	# Verify no data corruption first.
	echo "=== Verify the contents before replace ===" >> $seqres.full
	$FSSUM_PROG -r $tmp.fssum $SCRATCH_MNT >> $seqres.full 2>&1

	# Replace the missing device
	$BTRFS_UTIL_PROG replace start -Bf 2 $SPARE_DEV $SCRATCH_MNT >> $seqres.full

	# Drop all cache to make sure later read are all from the disks
	echo 3 > /proc/sys/vm/drop_caches

	# Re-check the file contents
	echo "=== Verify the contents after replace ===" >> $seqres.full
	$FSSUM_PROG -r $tmp.fssum $SCRATCH_MNT >> $seqres.full 2>&1

	_scratch_unmount
}

for t in "${_btrfs_profile_configs[@]}"; do
	workload "$t"
done

_spare_dev_put
_scratch_dev_pool_put

echo "Silence is golden"

# success, all done
status=0
exit