#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2017 Oracle.  All Rights Reserved.
#
# FS QA Test 151
#
# Test if it's losing data chunk's raid profile after 'btrfs device
# remove'.
#
# The fix is
#	Btrfs: avoid losing data raid profile when deleting a device
#
seq=`basename $0`
seqres=$RESULT_DIR/$seq
echo "QA output created by $seq"

here=`pwd`
tmp=/tmp/$$
status=1	# failure is the default!
trap "_cleanup; exit \$status" 0 1 2 3 15

_cleanup()
{
	cd /
	rm -f $tmp.*
}

# get standard environment, filters and checks
. ./common/rc
. ./common/filter

# remove previous $seqres.full before test
rm -f $seqres.full

# real QA test starts here

# Modify as appropriate.
_supported_fs btrfs
_supported_os Linux
_require_scratch
_require_scratch_dev_pool 3
_require_btrfs_dev_del_by_devid

# We need exactly 3 disks to form a fixed stripe layout for this test.
_scratch_dev_pool_get 3

# create raid1 for data
_scratch_pool_mkfs "-d raid1 -b 1G" >> $seqres.full 2>&1

# we need an empty data chunk, so nospace_cache is required.
_scratch_mount -onospace_cache

# if data chunk is empty, 'btrfs device remove' can change raid1 to
# single.
$BTRFS_UTIL_PROG device delete 2 $SCRATCH_MNT >> $seqres.full 2>&1

# save btrfs filesystem df output for debug purpose
$BTRFS_UTIL_PROG filesystem df $SCRATCH_MNT 2>&1 | \
    tee -a $seqres.full | $AWK_PROG -F ':' '/Data,/ {print $1}'

_scratch_dev_pool_put

# success, all done
status=0
exit