#! /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").
# 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.
# See the License for the specific language governing permissions
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# 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
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# $FreeBSD: releng/12.3/tests/sys/cddl/zfs/tests/reservation/reservation_010_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	"@(#)reservation_010_pos.ksh	1.2	07/01/09 SMI"
#

. $STF_SUITE/include/libtest.kshlib
. $STF_SUITE/tests/reservation/reservation.kshlib

###############################################################################
#
# __stc_assertion_start
#
# ID: reservation_010_pos
#
# DESCRIPTION:
#
# In pool with a full filesystem and a filesystem with a reservation
# destroying another filesystem should allow more data to be written to
# the full filesystem
#
#
# STRATEGY:
# 1) Create a filesystem as dataset
# 2) Create a filesystem at the same level
# 3) Set a reservation on the dataset filesystem
# 4) Fill up the second filesystem
# 5) Destroy the dataset filesystem
# 6) Verify can write more data to the full filesystem
#
# TESTABILITY: explicit
#
# TEST_AUTOMATION_LEVEL: automated
#
# CODING_STATUS: COMPLETED (2005-07-04)
#
# __stc_assertion_end
#
################################################################################

verify_runnable "both"

log_assert "Destroying top level filesystem with reservation allows more data to" \
	" be written to another top level filesystem"

log_must $ZFS create $TESTPOOL/$TESTFS1

space_avail=`get_prop available $TESTPOOL`

#
# To make sure this test doesn't take too long to execute on
# large pools, we calculate a reservation setting which when
# applied to the dataset filesystem  will ensure we have
# RESV_FREE_SPACE left free in the pool.
#
(( resv_size_set = space_avail - RESV_FREE_SPACE ))

log_must $ZFS set reservation=$resv_size_set $TESTPOOL/$TESTFS1

space_avail_still=`get_prop available $TESTPOOL`

fill_size=`expr $space_avail_still + $RESV_TOLERANCE`
write_count=`expr $fill_size / $BLOCK_SIZE`

# Now fill up the filesystem (which doesn't have a reservation set
# and thus will use up whatever free space is left in the pool).
$FILE_WRITE -o create -f $TESTDIR/$TESTFILE1 -b $BLOCK_SIZE \
        -c $write_count -d 0
ret=$?
if (( $ret != $ENOSPC )); then
	log_fail "Did not get ENOSPC as expected (got $ret)."
fi

log_must $ZFS destroy -f $TESTPOOL/$TESTFS1

log_must $FILE_WRITE -o create -f $TESTDIR/$TESTFILE2 -b $BLOCK_SIZE \
        -c 1000 -d 0

log_pass "Destroying top level filesystem with reservation allows more data to" \
	" be written to another top level filesystem"
