#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2021 Chandan Babu R.  All Rights Reserved.
#
# FS QA Test 531
#
# Verify that XFS does not cause inode fork's extent count to overflow when
# punching out an extent.
. ./common/preamble
_begin_fstest auto quick punch zero insert collapse

# Import common functions.
. ./common/filter
. ./common/inject

# real QA test starts here

_supported_fs xfs
_require_scratch
_require_xfs_debug
_require_xfs_io_command "fpunch"
_require_xfs_io_command "finsert"
_require_xfs_io_command "fcollapse"
_require_xfs_io_command "fzero"
_require_xfs_io_error_injection "reduce_max_iextents"

echo "Format and mount fs"
_scratch_mkfs >> $seqres.full
_scratch_mount >> $seqres.full

bsize=$(_get_file_block_size $SCRATCH_MNT)
nr_blks=30

testfile=$SCRATCH_MNT/testfile

for op in fpunch finsert fcollapse fzero; do
	echo "* $op regular file"

	echo "Create \$testfile"
	touch $testfile

	echo "Inject reduce_max_iextents error tag"
	_scratch_inject_error reduce_max_iextents 1

	$XFS_IO_PROG -f -s \
		     -c "pwrite -b $((nr_blks * bsize)) 0 $((nr_blks * bsize))" \
		     $testfile  >> $seqres.full

	echo "$op alternating blocks"
	for i in $(seq 1 2 $((nr_blks - 1))); do
		$XFS_IO_PROG -f -c "$op $((i * bsize)) $bsize" $testfile \
		       >> $seqres.full 2>&1
		[[ $? != 0 ]] && break
	done

	echo "Verify \$testfile's extent count"

	nextents=$(_xfs_get_fsxattr nextents $testfile)
	if (( $nextents > 10 )); then
		echo "Extent count overflow check failed: nextents = $nextents"
		exit 1
	fi

	echo "Disable reduce_max_iextents error tag"
	_scratch_inject_error reduce_max_iextents 0

	rm $testfile
done

# success, all done
status=0
exit