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#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2023 SUSE Linux Products GmbH. All Rights Reserved.
#
# FS QA Test 297
#
# Make sure btrfs scrub can fix parity stripe corruption
#
. ./common/preamble
_begin_fstest auto quick raid scrub
. ./common/filter
_supported_fs btrfs
_require_odirect
_require_non_zoned_device "${SCRATCH_DEV}"
_require_scratch_dev_pool 3
_fixed_by_kernel_commit 486c737f7fdc \
"btrfs: raid56: always verify the P/Q contents for scrub"
# If neither raid5 or raid6 are supported do _notrun
if ! _check_btrfs_raid_type raid5 && ! _check_btrfs_raid_type raid6; then
_notrun "requires either raid5 or raid6 support"
fi
workload()
{
local profile=$1
local nr_devs=$2
if ! _check_btrfs_raid_type $profile; then
echo "$profile isn't supported, skipping" >> $seqres.full
return
fi
echo "=== Testing $nr_devs devices $profile ===" >> $seqres.full
_scratch_dev_pool_get $nr_devs
_scratch_pool_mkfs -d $profile -m single >> $seqres.full 2>&1
# Use v2 space cache to prevent v1 space cache affecting
# the result.
_scratch_mount -o space_cache=v2
# Create one 64K extent which would cover one data stripe.
$XFS_IO_PROG -f -d -c "pwrite -S 0xaa -b 64K 0 64K" \
"$SCRATCH_MNT/foobar" > /dev/null
sync
# Corrupt the P/Q stripe
local logical=$(_btrfs_get_first_logical $SCRATCH_MNT/foobar)
# The 2nd copy is pointed to P stripe directly.
physical_p=$(_btrfs_get_physical ${logical} 2)
devpath_p=$(_btrfs_get_device_path ${logical} 2)
_scratch_unmount
echo "Corrupt stripe P at devpath $devpath_p physical $physical_p" \
>> $seqres.full
$XFS_IO_PROG -d -c "pwrite -S 0xff -b 64K $physical_p 64K" $devpath_p \
> /dev/null
# Do a scrub to try repair the P stripe.
_scratch_mount -o space_cache=v2
$BTRFS_UTIL_PROG scrub start -BdR $SCRATCH_MNT >> $seqres.full 2>&1
_scratch_unmount
# Verify the repaired content directly
local output=$($XFS_IO_PROG -c "pread -qv $physical_p 16" $devpath_p | _filter_xfs_io_offset)
local expect="XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................"
echo "The first 16 bytes of parity stripe after scrub:" >> $seqres.full
echo $output >> $seqres.full
if [ "$output" != "$expect" ]; then
echo "Unexpected parity content"
echo "has:"
echo "$output"
echo "expect"
echo "$expect"
fi
# Last safenet, let btrfs check --check-data-csum to do an offline scrub.
$BTRFS_UTIL_PROG check --check-data-csum $SCRATCH_DEV >> $seqres.full 2>&1
if [ $? -ne 0 ]; then
echo "Error detected after the scrub"
fi
_scratch_dev_pool_put
}
workload raid5 2
workload raid6 3
echo "Silence is golden"
status=0
exit
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