zfs/tests/zfs-tests/tests/functional/fallocate/fallocate_punch-hole.ksh

#!/bin/ksh -p
#
# CDDL HEADER START
#
# The contents of this file are subject to the terms of the
# Common Development and Distribution License (the "License").
# You may not use this file except in compliance with the License.
#
# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
# or http://www.opensolaris.org/os/licensing.
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# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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#
# Copyright (c) 2020 by Lawrence Livermore National Security, LLC.
# Copyright (c) 2021 by The FreeBSD Foundation.
#

. $STF_SUITE/include/libtest.shlib

#
# DESCRIPTION:
# Test hole-punching functionality
#
# STRATEGY:
# 1. Create a dense file
# 2. Punch an assortment of holes in the file and verify the result.
#

verify_runnable "global"

#
# Prior to __FreeBSD_version 1400032 there are no mechanism to punch hole in a
# file on FreeBSD.  truncate -d support is required to call fspacectl(2) on
# behalf of the script.
#
if is_freebsd; then
	if [[ $(uname -K) -lt 1400032 ]]; then
		log_unsupported "Requires fspacectl(2) support on FreeBSD"
	fi
	if truncate -d 2>&1 | grep "illegal option" > /dev/null; then
		log_unsupported "Requires truncate(1) -d support on FreeBSD"
	fi
fi

FILE=$TESTDIR/$TESTFILE0
BLKSZ=$(get_prop recordsize $TESTPOOL)

function cleanup
{
	[[ -e $TESTDIR ]] && log_must rm -f $FILE
}

function check_reported_size
{
	typeset expected_size=$1

	if ! [ -e "${FILE}" ]; then
		log_fail "$FILE does not exist"
	fi
		
	reported_size=$(du "${FILE}" | awk '{print $1}')
	if [ "$reported_size" != "$expected_size" ]; then
		log_fail "Incorrect reported size: $reported_size != $expected_size"
	fi
}

function check_apparent_size
{
	typeset expected_size=$1

	apparent_size=$(stat_size "${FILE}")
	if [ "$apparent_size" != "$expected_size" ]; then
		log_fail "Incorrect apparent size: $apparent_size != $expected_size"
	fi
}

log_assert "Ensure holes can be punched in files making them sparse"

log_onexit cleanup

# Create a dense file and check it is the correct size.
log_must file_write -o create -f $FILE -b $BLKSZ -c 8
sync_pool $TESTPOOL
log_must check_reported_size 1027

# Punch a hole for the first full block.
log_must punch_hole 0 $BLKSZ $FILE
sync_pool $TESTPOOL
log_must check_reported_size 899

# Partially punch a hole in the second block.
log_must punch_hole $BLKSZ $((BLKSZ / 2)) $FILE
sync_pool $TESTPOOL
log_must check_reported_size 899

# Punch a hole which overlaps the third and fourth block.
log_must punch_hole $(((BLKSZ * 2) + (BLKSZ / 2))) $((BLKSZ)) $FILE
sync_pool $TESTPOOL
log_must check_reported_size 899

# Punch a hole from the fifth block past the end of file.  The apparent
# file size should not change since --keep-size is implied.
apparent_size=$(stat_size $FILE)
log_must punch_hole $((BLKSZ * 4)) $((BLKSZ * 10)) $FILE
sync_pool $TESTPOOL
log_must check_reported_size 387
log_must check_apparent_size $apparent_size

log_pass "Ensure holes can be punched in files making them sparse"