tests/btrfs/269

#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2022 Christoph Hellwig.
#
# FS QA Test 269
#
# Test btrfs read repair over tricky stripe boundaries on the raid10 profile:
#
#             | stripe 0 | stripe 2
#   --------------------------------
#    mirror 1 | I/O FAIL | GOOD    
#    mirror 2 | GOOD     | CSUM FAIL
#

. ./common/preamble
_begin_fstest auto quick read_repair

. ./common/filter

_require_scratch
_require_odirect
# No data checksums for NOCOW case, so can't detect corruption and repair data.
_require_btrfs_no_nodatacow
_require_non_zoned_device "${SCRATCH_DEV}" # no overwrites on zoned devices
_require_scratch_dev_pool 4
_scratch_dev_pool_get 4

echo "step 1......mkfs.btrfs"

_scratch_pool_mkfs "-d raid10 -b 1G" >>$seqres.full 2>&1
_scratch_mount

$XFS_IO_PROG -f -d -c "pwrite -S 0xaa -b 128K 0 128K" \
	"$SCRATCH_MNT/foobar" | \
	_filter_xfs_io_offset

# ensure btrfs-map-logical sees the tree updates
sync

logical=$(_btrfs_get_first_logical $SCRATCH_MNT/foobar)

physical1=$(_btrfs_get_physical ${logical} 1)
devpath1=$(_btrfs_get_device_path ${logical} 1)

physical4=$(_btrfs_get_physical ${logical} 3)
devpath4=$(_btrfs_get_device_path ${logical} 3)

_scratch_unmount

echo "step 2......corrupt file extent"

$XFS_IO_PROG -d -c "pwrite -S 0xbd -b 64K $physical1 64K" \
	$devpath1 > /dev/null
$XFS_IO_PROG -d -c "pwrite -S 0xbb -b 64K $((physical4 + 65536)) 64K" \
	$devpath4 > /dev/null

_scratch_mount

echo "step 3......repair the bad copy"

_btrfs_direct_read_on_mirror 0 2 "$SCRATCH_MNT/foobar" 0 128K
_btrfs_direct_read_on_mirror 1 2 "$SCRATCH_MNT/foobar" 0 128K

_scratch_unmount

echo "step 4......check if the repair worked"
$XFS_IO_PROG -d -c "pread -v -b 512 $physical1 512" $devpath1 |\
	_filter_xfs_io_offset
$XFS_IO_PROG -d -c "pread -v -b 512 $((physical4 + 65536)) 512" $devpath4 |\
	_filter_xfs_io_offset

_scratch_dev_pool_put
# success, all done
status=0
exit