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#! /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
. ./common/fail_make_request
_supported_fs btrfs
_require_scratch
_require_fail_make_request
_require_scratch_dev_pool 2
_scratch_dev_pool_get 2
_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}'`
_allow_fail_make_request
echo "Step 1: writing with one failing mirror:"
_bdev_fail_make_request $SCRATCH_DEV 1
$XFS_IO_PROG -f -c "pwrite -W -S 0xaa 0 8K" $SCRATCH_MNT/foobar | _filter_xfs_io
_bdev_fail_make_request $SCRATCH_DEV 0
# btrfs counts errors per IO, assuming the data is merged that'll be 1 IO, then
# the log tree block and then the log root tree block and then the super block.
# We should see at least 4 failed IO's, but with subpage blocksize we could see
# more if the log blocks end up on the same page, or if the data IO gets split
# at all.
errs=$($BTRFS_UTIL_PROG device stats $SCRATCH_DEV | \
$AWK_PROG '/write_io_errs/ { print $2 }')
if [ $errs -lt 4 ]; 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):"
_bdev_fail_make_request $SCRATCH_DEV 1
_bdev_fail_make_request $dev2 1
$XFS_IO_PROG -f -c "pwrite -W -S 0xbb 0 8K" $SCRATCH_MNT/foobar | _filter_xfs_io
_bdev_fail_make_request $dev2 0
_bdev_fail_make_request $SCRATCH_DEV 0
_disallow_fail_make_request
_scratch_dev_pool_put
# success, all done
status=0
exit
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