tests/btrfs/223

#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2020 SUSE Linux Products GmbH. All Rights Reserved.
#
# FS QA Test No. btrfs/223
#
# Test that after replacing a device, if we run fstrim against the filesystem
# we do not trim/discard allocated chunks in the new device. We verify that
# allocated chunks in the new device were not trim/discarded by mounting the
# new device only in degraded mode, as this is the easiest way to verify it.
#
seq=`basename $0`
seqres=$RESULT_DIR/$seq
echo "QA output created by $seq"

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

# real QA test starts here
_supported_fs btrfs
_require_scratch_dev_pool 3
_require_command "$WIPEFS_PROG" wipefs

rm -f $seqres.full

_scratch_dev_pool_get 2
_spare_dev_get
dev1=$(echo $SCRATCH_DEV_POOL | $AWK_PROG '{ print $1 }')
dev2=$(echo $SCRATCH_DEV_POOL | $AWK_PROG '{ print $2 }')

_scratch_pool_mkfs "-m raid1 -d raid1"
_scratch_mount
_require_batched_discard $SCRATCH_MNT

# Add a test file with some data.
$XFS_IO_PROG -f -c "pwrite -S 0xab 0 10M" $SCRATCH_MNT/foo | _filter_xfs_io

# Replace the first device, $dev1, with a new device.
$BTRFS_UTIL_PROG replace start -Bf $dev1 $SPARE_DEV $SCRATCH_MNT

# Run fstrim, it should not trim/discard allocated extents in the new device.
$FSTRIM_PROG $SCRATCH_MNT

# Unmount the filesystem.
_scratch_unmount

# Mount the filesystem in degraded mode using the new device and verify that the
# mount succeeds and our file exists, with a size of 10Mb and all its bytes have
# a value of 0xab.
$WIPEFS_PROG -a $dev1 $dev2 >> $seqres.full 2>&1
_mount -o degraded $SPARE_DEV $SCRATCH_MNT

echo "File foo data:"
od -A d -t x1 $SCRATCH_MNT/foo

_spare_dev_put
_scratch_dev_pool_put

status=0
exit