#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2020 SUSE Linux Products GmbH. All Rights Reserved.
#
# FS QA Test No. 610
#
# Test a fallocate() zero range operation against a large file range for which
# there are many small extents allocated. Verify the operation does not fail
# and the respective range return zeroes on subsequent reads.
#
seq=`basename $0`
seqres=$RESULT_DIR/$seq
echo "QA output created by $seq"
tmp=/tmp/$$
status=1	# failure is the default!
trap "_cleanup; exit \$status" 0 1 2 3 15

_cleanup()
{
	cd /
	rm -f $tmp.*
}

# get standard environment, filters and checks
. ./common/rc
. ./common/filter

# real QA test starts here
_supported_fs generic
_require_scratch
_require_xfs_io_command "fzero"
_require_xfs_io_command "fpunch"
_require_test_program "punch-alternating"

rm -f $seqres.full

_scratch_mkfs >>$seqres.full 2>&1
_scratch_mount

# Create a file with many small extents. To speed up file creation, do
# buffered writes and then punch a hole on every other block.
$XFS_IO_PROG -f -c "pwrite -S 0xab -b 10M 0 100M" \
	$SCRATCH_MNT/foobar >>$seqres.full
$here/src/punch-alternating $SCRATCH_MNT/foobar >>$seqres.full

# For btrfs, trigger a transaction commit to force metadata COW for the
# following fallocate zero range operation.
sync

$XFS_IO_PROG -c "fzero 0 100M" $SCRATCH_MNT/foobar

# Check the file content after umounting and mounting again the fs, to verify
# everything was persisted.
_scratch_cycle_mount

echo "File content after zero range operation:"
od -A d -t x1 $SCRATCH_MNT/foobar

status=0
exit