1#! /usr/local/bin/ksh93 -p
2#
3# CDDL HEADER START
4#
5# The contents of this file are subject to the terms of the
6# Common Development and Distribution License (the "License").
7# You may not use this file except in compliance with the License.
8#
9# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10# or http://www.opensolaris.org/os/licensing.
11# See the License for the specific language governing permissions
12# and limitations under the License.
13#
14# When distributing Covered Code, include this CDDL HEADER in each
15# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16# If applicable, add the following below this CDDL HEADER, with the
17# fields enclosed by brackets "[]" replaced with your own identifying
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20# CDDL HEADER END
21#
22
23#
24# Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
25# Use is subject to license terms.
26#
27# ident	"@(#)reservation_008_pos.ksh	1.3	09/08/06 SMI"
28#
29
30. $STF_SUITE/include/libtest.kshlib
31. $STF_SUITE/tests/reservation/reservation.kshlib
32
33###############################################################################
34#
35# __stc_assertion_start
36#
37# ID: reservation_008_pos
38#
39# DESCRIPTION:
40#
41# Setting a reservation reserves a defined minimum amount of space for
42# a dataset, and prevents other datasets using that space. Verify that
43# reducing the reservation on a filesystem allows other datasets in
44# the pool to use that space.
45#
46# STRATEGY:
47# 1) Create multiple filesystems
48# 2) Set reservations on all bar one of the filesystems
49# 3) Fill up the one non-reserved filesystem
50# 4) Reduce one of the reservations and verify can write more
51# data into the non-reserved filesystem
52#
53# TESTABILITY: explicit
54#
55# TEST_AUTOMATION_LEVEL: automated
56#
57# CODING_STATUS: COMPLETED (2005-07-04)
58#
59# __stc_assertion_end
60#
61################################################################################
62
63verify_runnable "both"
64
65log_assert "Verify reducing reservation allows other datasets to use space"
66
67log_must create_multiple_fs $RESV_NUM_FS $TESTPOOL/$TESTFS $TESTDIR
68
69space_avail=`get_prop available $TESTPOOL`
70space_used=`get_prop used $TESTPOOL`
71
72#
73# To make sure this test doesn't take too long to execute on
74# large pools, we calculate a reservation setting which when
75# applied to all bar one of the filesystems (RESV_NUM_FS-1) will
76# ensure we have RESV_FREE_SPACE left free in the pool, which we will
77# be able to quickly fill.
78#
79resv_space_avail=`expr $space_avail - $RESV_FREE_SPACE`
80num_resv_fs=`expr $RESV_NUM_FS - 1` # Number of FS to which resv will be applied
81resv_size_set=`expr $resv_space_avail / $num_resv_fs`
82
83#
84# We set the reservations now, rather than when we created the filesystems
85# to allow us to take into account space used by the filsystem metadata
86#
87# Note we don't set a reservation on the first filesystem we created,
88# hence num=1 rather than zero below.
89#
90typeset -i num=1
91while (( $num < $RESV_NUM_FS )); do
92	log_must $ZFS set reservation=$resv_size_set $TESTPOOL/$TESTFS$num
93	(( num = num + 1 ))
94done
95
96space_avail_still=`get_prop available $TESTPOOL`
97
98fill_size=`expr $space_avail_still + $RESV_TOLERANCE`
99write_count=`expr $fill_size / $BLOCK_SIZE`
100
101# Now fill up the first filesystem (which doesn't have a reservation set
102# and thus will use up whatever free space is left in the pool).
103num=0
104log_note "Writing to $TESTDIR$num/$TESTFILE1"
105
106$FILE_WRITE -o create -f $TESTDIR$num/$TESTFILE1 -b $BLOCK_SIZE \
107        -c $write_count -d 0
108ret=$?
109if (( $ret != $ENOSPC )); then
110	log_fail "Did not get ENOSPC as expected (got $ret)."
111fi
112
113# Remove the reservation on one of the other filesystems and verify
114# can write more data to the original non-reservation filesystem.
115num=1
116log_must $ZFS set reservation=none $TESTPOOL/${TESTFS}$num
117num=0
118log_must $FILE_WRITE -o create -f ${TESTDIR}$num/$TESTFILE2 -b $BLOCK_SIZE \
119        -c 1000 -d 0
120
121log_pass "reducing reservation allows other datasets to use space"
122