#! /usr/local/bin/ksh93 -p
#
# CDDL HEADER START
#
# The contents of this file are subject to the terms of the
# Common Development and Distribution License (the "License").
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# $FreeBSD: releng/12.3/tests/sys/cddl/zfs/tests/snapshot/snapshot_008_pos.ksh 329867 2018-02-23 16:31:00Z asomers $

#
# Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
# Use is subject to license terms.
#
# ident	"@(#)snapshot_008_pos.ksh	1.2	07/01/09 SMI"
#
. $STF_SUITE/include/libtest.kshlib

################################################################################
#
# __stc_assertion_start
#
# ID: snapshot_008_pos
#
# DESCRIPTION:
# Verify that destroying snapshots returns space to the pool.
#
# STRATEGY:
# 1. Create a file system and populate it while snapshotting.
# 2. Destroy the snapshots and remove the files.
# 3. Verify the space returns to the pool.
#
# TESTABILITY: explicit
#
# TEST_AUTOMATION_LEVEL: automated
#
# CODING_STATUS: COMPLETED (2005-09-29)
#
# __stc_assertion_end
#
################################################################################

verify_runnable "both"

function cleanup
{
	typeset -i i=1
	while [[ $i -lt $COUNT ]]; do
		snapexists $SNAPFS.$i
		[[ $? -eq 0 ]] && \
			log_must $ZFS destroy $SNAPFS.$i

		(( i = i + 1 ))
	done

	[[ -e $TESTDIR ]] && \
		log_must $RM -rf $TESTDIR/* > /dev/null 2>&1
}

log_assert "Verify that destroying snapshots returns space to the pool."

log_onexit cleanup

[[ -n $TESTDIR ]] && \
    log_must $RM -rf $TESTDIR/* > /dev/null 2>&1

typeset -i COUNT=10

orig_size=`get_prop available $TESTPOOL`

log_note "Populate the $TESTDIR directory"
populate_dir $TESTDIR/file $COUNT $NUM_WRITES $BLOCKSZ ITER $SNAPFS

typeset -i i=1
while [[ $i -lt $COUNT ]]; do
	log_must rm -f $TESTDIR/file.$i > /dev/null 2>&1
	log_must $ZFS destroy $SNAPFS.$i

	(( i = i + 1 ))
done

new_size=`get_prop available $TESTPOOL`

typeset -i tolerance=0

(( tolerance = new_size - orig_size))
if (( tolerance > LIMIT )); then
        log_fail "Space not freed. ($orig_size != $new_size)"
fi

log_pass "After destroying snapshots, the space is returned to the pool."
