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
18# information: Portions Copyright [yyyy] [name of copyright owner]
19#
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. $STF_SUITE/include/libtest.kshlib
28. $STF_SUITE/tests/reservation/reservation.kshlib
29
30###############################################################################
31#
32# __stc_assertion_start
33#
34# ID: reservation_008_pos
35#
36# DESCRIPTION:
37#
38# Setting a reservation reserves a defined minimum amount of space for
39# a dataset, and prevents other datasets using that space. Verify that
40# reducing the reservation on a filesystem allows other datasets in
41# the pool to use that space.
42#
43# STRATEGY:
44# 1) Create multiple filesystems
45# 2) Set reservations on all bar one of the filesystems
46# 3) Fill up the one non-reserved filesystem
47# 4) Reduce one of the reservations and verify can write more
48# data into the non-reserved filesystem
49#
50# TESTABILITY: explicit
51#
52# TEST_AUTOMATION_LEVEL: automated
53#
54# CODING_STATUS: COMPLETED (2005-07-04)
55#
56# __stc_assertion_end
57#
58################################################################################
59
60verify_runnable "both"
61
62log_assert "Verify reducing reservation allows other datasets to use space"
63
64log_must create_multiple_fs $RESV_NUM_FS $TESTPOOL/$TESTFS $TESTDIR
65
66space_avail=`get_prop available $TESTPOOL`
67space_used=`get_prop used $TESTPOOL`
68
69#
70# To make sure this test doesn't take too long to execute on
71# large pools, we calculate a reservation setting which when
72# applied to all bar one of the filesystems (RESV_NUM_FS-1) will
73# ensure we have RESV_FREE_SPACE left free in the pool, which we will
74# be able to quickly fill.
75#
76resv_space_avail=`expr $space_avail - $RESV_FREE_SPACE`
77num_resv_fs=`expr $RESV_NUM_FS - 1` # Number of FS to which resv will be applied
78resv_size_set=`expr $resv_space_avail / $num_resv_fs`
79
80#
81# We set the reservations now, rather than when we created the filesystems
82# to allow us to take into account space used by the filsystem metadata
83#
84# Note we don't set a reservation on the first filesystem we created,
85# hence num=1 rather than zero below.
86#
87typeset -i num=1
88while (( $num < $RESV_NUM_FS )); do
89	log_must $ZFS set reservation=$resv_size_set $TESTPOOL/$TESTFS$num
90	(( num = num + 1 ))
91done
92
93space_avail_still=`get_prop available $TESTPOOL`
94
95fill_size=`expr $space_avail_still + $RESV_TOLERANCE`
96write_count=`expr $fill_size / $BLOCK_SIZE`
97
98# Now fill up the first filesystem (which doesn't have a reservation set
99# and thus will use up whatever free space is left in the pool).
100num=0
101log_note "Writing to $TESTDIR$num/$TESTFILE1"
102
103$FILE_WRITE -o create -f $TESTDIR$num/$TESTFILE1 -b $BLOCK_SIZE \
104        -c $write_count -d 0
105ret=$?
106if (( $ret != $ENOSPC )); then
107	log_fail "Did not get ENOSPC as expected (got $ret)."
108fi
109
110# Remove the reservation on one of the other filesystems and verify
111# can write more data to the original non-reservation filesystem.
112num=1
113log_must $ZFS set reservation=none $TESTPOOL/${TESTFS}$num
114num=0
115log_must $FILE_WRITE -o create -f ${TESTDIR}$num/$TESTFILE2 -b $BLOCK_SIZE \
116        -c 1000 -d 0
117
118log_pass "reducing reservation allows other datasets to use space"
119