tests/btrfs/163

#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2018 Oracle.  All Rights Reserved.
#
# FS QA Test 163
#
# Test case to verify that a sprouted device can be replaced
#  Create a seed device
#  Create a sprout device
#  Remount RW
#  Run device replace on the sprout device
#
# Depends on the kernel patch
#   c6a5d954950c btrfs: fail replace of seed 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.*
	_btrfs_rescan_devices
}

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

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

# real QA test starts here

# Modify as appropriate.
_supported_fs btrfs
_require_command "$BTRFS_TUNE_PROG" btrfstune
_require_scratch_dev_pool 3
_require_btrfs_forget_or_module_loadable

_scratch_dev_pool_get 3

dev_seed=$(echo $SCRATCH_DEV_POOL | awk '{print $1}')
dev_sprout=$(echo $SCRATCH_DEV_POOL | awk '{print $2}')
dev_replace_tgt=$(echo $SCRATCH_DEV_POOL | awk '{print $3}')

create_seed()
{
	_mkfs_dev $dev_seed
	run_check _mount $dev_seed $SCRATCH_MNT
	$XFS_IO_PROG -f -d -c "pwrite -S 0xab 0 4M" $SCRATCH_MNT/foobar >\
		/dev/null
	echo -- golden --
	od -x $SCRATCH_MNT/foobar
	_run_btrfs_util_prog filesystem show -m $SCRATCH_MNT
	_scratch_unmount
	$BTRFS_TUNE_PROG -S 1 $dev_seed
	run_check _mount $dev_seed $SCRATCH_MNT
}

add_sprout()
{
	_run_btrfs_util_prog device add -f $dev_sprout $SCRATCH_MNT
	_run_btrfs_util_prog filesystem show -m $SCRATCH_MNT
	_mount -o remount,rw $dev_sprout $SCRATCH_MNT
	$XFS_IO_PROG -f -c "pwrite -S 0xcd 0 4M" $SCRATCH_MNT/foobar2 >\
		/dev/null
}

replace_sprout()
{
	_run_btrfs_util_prog replace start -fB $dev_sprout $dev_replace_tgt $SCRATCH_MNT
	_run_btrfs_util_prog filesystem show -m $SCRATCH_MNT
	_scratch_unmount
	_btrfs_forget_or_module_reload
	run_check _mount -o device=$dev_seed $dev_replace_tgt $SCRATCH_MNT
	echo -- sprout --
	od -x $SCRATCH_MNT/foobar
	od -x $SCRATCH_MNT/foobar2
	_scratch_unmount

}

seed_is_mountable()
{
	_btrfs_forget_or_module_reload
	run_check _mount $dev_seed $SCRATCH_MNT
	_run_btrfs_util_prog filesystem show -m $SCRATCH_MNT
	_scratch_unmount
}

create_seed
add_sprout
replace_sprout

seed_is_mountable

_scratch_dev_pool_put
_btrfs_rescan_devices

status=0
exit