#!/bin/ksh

#
# This file and its contents are supplied under the terms of the
# Common Development and Distribution License ("CDDL"), version 1.0.
# You may only use this file in accordance with the terms of version
# 1.0 of the CDDL.
#
# A full copy of the text of the CDDL should have accompanied this
# source.  A copy of the CDDL is also available via the Internet at
# http://www.illumos.org/license/CDDL.
#

#
# Copyright (c) 2014, 2016 by Delphix. All rights reserved.
#

#
# Description:
# Verify that holes can be written and read back correctly in ZFS.
#
# Strategy:
# 1. Create a testfile with varying holes and data throughout the file.
# 2. Verify that each created file has the correct number of holes and
# data blocks as seen by both lseek and libzfs.
# 3. Do the same verification for a largefile.
# 4. Repeat for each recsize.
#

. $STF_SUITE/include/libtest.shlib
. $STF_SUITE/tests/functional/holes/holes.shlib

verify_runnable "both"
testfile="$TESTDIR/testfile"

for bs in 512 1024 2048 4096 8192 16384 32768 65536 131072; do
	log_must zfs set recsize=$bs $TESTPOOL/$TESTFS

	#
	# Create combinations of holes and data to verify holes ending files
	# and the like. (hhh, hhd, hdh...)
	#
	log_must mkholes -h 0:$((bs * 6)) $testfile
	verify_holes_and_data_blocks $testfile 6 0
	log_must rm $testfile

	log_must mkholes -h 0:$((bs * 4)) -d $((bs * 4)):$((bs * 2)) $testfile
	verify_holes_and_data_blocks $testfile 4 2
	log_must rm $testfile

	log_must mkholes -h 0:$((bs * 2)) -d $((bs * 2)):$((bs * 2)) \
	    -h $((bs * 4)):$((bs * 2)) $testfile
	verify_holes_and_data_blocks $testfile 4 2
	log_must rm $testfile

	log_must mkholes -h 0:$((bs * 2)) -d $((bs * 2)):$((bs * 4)) $testfile
	verify_holes_and_data_blocks $testfile 2 4
	log_must rm $testfile

	log_must mkholes -d 0:$((bs * 2)) -h $((bs * 2)):$((bs * 4)) $testfile
	verify_holes_and_data_blocks $testfile 4 2
	log_must rm $testfile

	log_must mkholes -d 0:$((bs * 2)) -h $((bs * 2)):$((bs * 2)) \
	    -d $((bs * 4)):$((bs * 2)) $testfile
	verify_holes_and_data_blocks $testfile 2 4
	log_must rm $testfile

	log_must mkholes -d 0:$((bs * 4)) -h $((bs * 4)):$((bs * 2)) $testfile
	verify_holes_and_data_blocks $testfile 2 4
	log_must rm $testfile

	log_must mkholes -d 0:$((bs * 6)) $testfile
	verify_holes_and_data_blocks $testfile 0 6
	log_must rm $testfile

	# Verify holes are correctly seen past the largefile limit.
	len=$((1024**3 * 5))
	nblks=$((len / bs))
	log_must mkholes -h 0:$len -d $len:$bs $testfile
	verify_holes_and_data_blocks $testfile $nblks 1
	log_must rm $testfile
done

log_pass "Basic hole tests pass."