#!/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 https://opensource.org/licenses/CDDL-1.0.
# See the License for the specific language governing permissions
# and limitations under the License.
#
# When distributing Covered Code, include this CDDL HEADER in each
# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
# If applicable, add the following below this CDDL HEADER, with the
# fields enclosed by brackets "[]" replaced with your own identifying
# information: Portions Copyright [yyyy] [name of copyright owner]
#
# CDDL HEADER END
#

#
# Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
# Use is subject to license terms.
#

#
# Copyright (c) 2013, 2016 by Delphix. All rights reserved.
#

. $STF_SUITE/include/libtest.shlib
. $STF_SUITE/tests/functional/sparse/sparse.cfg

#
# DESCRIPTION:
# Holes in ZFS files work correctly.
#
# STRATEGY:
# 1. Open file
# 2. Write random blocks in random places
# 3. Read each block back to check for correctness.
# 4. Repeat steps 2 and 3 lots of times
#

verify_runnable "global"

function cleanup
{
	[[ -e $TESTDIR ]] && log_must rm -rf $TESTDIR/*
}

log_assert "Ensure random blocks are read back correctly"

options=""
options_display="default options"

log_onexit cleanup

[[ -n "$HOLES_FILESIZE" ]] && options=" $options -f $HOLES_FILESIZE "

[[ -n "$HOLES_BLKSIZE" ]] && options="$options -b $HOLES_BLKSIZE "

[[ -n "$HOLES_COUNT" ]] && options="$options -c $HOLES_COUNT "

[[ -n "$HOLES_SEED" ]] && options="$options -s $HOLES_SEED "

[[ -n "$HOLES_FILEOFFSET" ]] && options="$options -o $HOLES_FILEOFFSET "

options="$options -r "

[[ -n "$options" ]] && options_display=$options

log_note "Invoking file_trunc with: $options_display"
log_must file_trunc $options $TESTDIR/$TESTFILE

typeset dir=$(get_device_dir $DISKS)
verify_filesys "$TESTPOOL" "$TESTPOOL/$TESTFS" "$dir"

log_pass "Random blocks have been read back correctly."
