#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2023 SUSE Linux Products GmbH. All Rights Reserved.
#
# FS QA Test 292
#
# Test btrfs behavior with large chunks (size beyond 4G) for basic read-write
# and discard.
# This test focus on RAID0.
#
. ./common/preamble
_begin_fstest auto raid volume trim

. ./common/filter

_supported_fs btrfs
_require_scratch_dev_pool 6
_require_fstrim
_fixed_by_kernel_commit a7299a18a179 \
	"btrfs: fix u32 overflows when left shifting @stripe_nr"

_scratch_dev_pool_get 6

datasize=$((5 * 1024 * 1024 * 1024))
filesize=$((8 * 1024 * 1024))
nr_files=$(($datasize / $filesize))

# Make sure each device has at least 2G.
# Btrfs has a limits on per-device stripe length of 1G.
# Double that so that we can ensure a RAID0 data chunk with 6G size.
for i in $SCRATCH_DEV_POOL; do
	devsize=$(blockdev --getsize64 "$i")
	if [ $devsize -lt $((2 * 1024 * 1024 * 1024)) ]; then
		_scratch_dev_pool_put
		_notrun "device $i is too small, need at least 2G"
	fi
done

_scratch_pool_mkfs -m raid1 -d raid0 >> $seqres.full 2>&1

# We disable async/sync auto discard, so that btrfs won't try to
# cache the discard result which can cause unexpected skip for some trim range.
_scratch_mount -o nodiscard
_require_batched_discard $SCRATCH_MNT

# Fill the data chunk with 5G data.
for (( i = 0; i < $nr_files; i++ )); do
	$XFS_IO_PROG -f -c "pwrite -i /dev/urandom 0 $filesize" \
		$SCRATCH_MNT/file_$i > /dev/null
done
sync
echo "=== With initial 5G data written ===" >> $seqres.full
$BTRFS_UTIL_PROG filesystem df $SCRATCH_MNT >> $seqres.full

_scratch_unmount

# Make sure we haven't corrupted anything.
$BTRFS_UTIL_PROG check --check-data-csum $SCRATCH_DEV >> $seqres.full 2>&1
if [ $? -ne 0 ]; then
	_scratch_dev_pool_put
	_fail "data corruption detected after initial data filling"
fi

_scratch_mount -o nodiscard
# Delete half of the data, and do discard
rm -rf - "$SCRATCH_MNT/*[02468]"
sync
$FSTRIM_PROG $SCRATCH_MNT

echo "=== With 2.5G data trimmed ===" >> $seqres.full
$BTRFS_UTIL_PROG filesystem df $SCRATCH_MNT >> $seqres.full
_scratch_unmount

# Make sure fstrim doesn't corrupt anything.
$BTRFS_UTIL_PROG check --check-data-csum $SCRATCH_DEV >> $seqres.full 2>&1
if [ $? -ne 0 ]; then
	_scratch_dev_pool_put
	_fail "data corruption detected after running fstrim"
fi

_scratch_dev_pool_put

echo "Silence is golden"

# success, all done
status=0
exit