#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2022 Christoph Hellwig.
#
# FS QA Test btrfs/271
#
# Test btrfs write error propagation and reporting on the raid1 profile.
#
. ./common/preamble
_begin_fstest auto quick raid

. ./common/filter

_supported_fs btrfs
_require_scratch
_require_fail_make_request
_require_scratch_dev_pool 2
_scratch_dev_pool_get 2

enable_io_failure()
{
	local sysfs_bdev=`_sysfs_dev $1`

	echo 1 > $sysfs_bdev/make-it-fail
}

disable_io_failure()
{
	local sysfs_bdev=`_sysfs_dev $1`

	echo 0 > $sysfs_bdev/make-it-fail
}

_check_minimal_fs_size $(( 1024 * 1024 * 1024 ))
_scratch_pool_mkfs "-d raid1 -b 1G" >> $seqres.full 2>&1

_scratch_mount

dev2=`echo $SCRATCH_DEV_POOL | $AWK_PROG '{print $2}'`

pagesize=$(get_page_size)
blocksize=$(_get_block_size $SCRATCH_MNT)
sectors_per_page=$(($pagesize / $blocksize))

# enable block I/O error injection
echo 100 > $DEBUGFS_MNT/fail_make_request/probability
echo 1000 > $DEBUGFS_MNT/fail_make_request/times
echo 0 > $DEBUGFS_MNT/fail_make_request/verbose

echo "Step 1: writing with one failing mirror:"
enable_io_failure $SCRATCH_DEV
$XFS_IO_PROG -f -c "pwrite -W -S 0xaa 0 8K" $SCRATCH_MNT/foobar | _filter_xfs_io
disable_io_failure $SCRATCH_DEV

errs=$($BTRFS_UTIL_PROG device stats $SCRATCH_DEV | \
	$AWK_PROG '/write_io_errs/ { print $2 }')
if [ $errs -ne $((4 * $sectors_per_page)) ]; then
        _fail "Errors: $errs expected: 4"
fi

echo "Step 2: verify that the data reads back fine:"
$XFS_IO_PROG -c "pread -v 0 8K" $SCRATCH_MNT/foobar | _filter_xfs_io_offset

echo "Step 3: writing with two failing mirrors (should fail):"
enable_io_failure $SCRATCH_DEV
enable_io_failure $dev2
$XFS_IO_PROG -f -c "pwrite -W -S 0xbb 0 8K" $SCRATCH_MNT/foobar | _filter_xfs_io
disable_io_failure $dev2
disable_io_failure $SCRATCH_DEV

# disable block I/O error injection
echo 0 > $DEBUGFS_MNT/fail_make_request/probability
echo 0 > $DEBUGFS_MNT/fail_make_request/times

_scratch_dev_pool_put
# success, all done
status=0
exit
