#! /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.
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# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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#
# Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
# Use is subject to license terms.
#
# ident	"@(#)reservation_009_pos.ksh	1.3	09/08/06 SMI"
#

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

###############################################################################
#
# __stc_assertion_start
#
# ID: reservation_009_pos
#
# DESCRIPTION:
#
# In pool with a full filesystem and another filesystem with a reservation
# setting the reservation on the second filesystem to 'none' should allow more
# data to be written to the first filesystem.
#
#
# STRATEGY:
# 1) Create a filesystem as a dataset
# 2) Create a filesystem at the same level
# 3) Set a reservation on the dataset filesystem
# 4) Fill up the filesystem
# 5) Set the reservation on the dataset filesystem to 'none'
# 6) Verify we can write more data to the first filesystem
#
# TESTABILITY: explicit
#
# TEST_AUTOMATION_LEVEL: automated
#
# CODING_STATUS: COMPLETED (2005-07-04)
#
# __stc_assertion_end
#
################################################################################

verify_runnable "both"

log_assert "Setting top level dataset reservation to 'none' allows more data to" \
	" be written to 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 will ensure we have RESV_FREE_SPACE 
# left free in the pool which we can quickly fill.
#
(( 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 set reservation=none $TESTPOOL/$TESTFS1

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

log_pass "Setting top level dataset reservation to 'none' allows more " \
	"data to be written to the top level filesystem"
