#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2016 SUSE Linux Products GmbH. All Rights Reserved.
#
# FSQA Test No. 116
#
# Verify that when a fitrim operation is made against a btrfs filesystem, the
# ranges [0, 64Kb[ and [68Kb, 1Mb[ of the device are not discarded, they remain
# with the content they had before the fitrim operation. These regions of the
# device are reserved for a boot loader to use at its will.
#
. ./common/preamble
_begin_fstest auto quick metadata

. ./common/filter

_supported_fs btrfs
_require_scratch
# Writing non-contiguous data directly to the device
_require_non_zoned_device $SCRATCH_DEV

_scratch_mkfs >>$seqres.full 2>&1

# Write to the [0, 64Kb[ and [68Kb, 1Mb[ ranges of the device. These ranges are
# reserved for a boot loader to use (GRUB for example) and btrfs should never
# use them - neither for allocating metadata/data nor should trim/discard them.
# The range [64Kb, 68Kb[ is used for the primary superblock of the filesystem.
$XFS_IO_PROG -c "pwrite -S 0xfd 0 64K" $SCRATCH_DEV | _filter_xfs_io
$XFS_IO_PROG -c "pwrite -S 0xfd 68K 956K" $SCRATCH_DEV | _filter_xfs_io

# Now mount the filesystem and perform a fitrim against it.
_scratch_mount
_require_batched_discard $SCRATCH_MNT
$FSTRIM_PROG $SCRATCH_MNT

# Now unmount the filesystem and verify the content of the ranges was not
# modified (no trim/discard happened on them).
_scratch_unmount
echo "Content of the ranges [0, 64Kb] and [68Kb, 1Mb[ after fitrim:"
od -t x1 -N $((64 * 1024)) $SCRATCH_DEV
od -t x1 -j $((68 * 1024)) -N $((956 * 1024)) $SCRATCH_DEV

status=0
exit