1#!/usr/bin/bash -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
28#
29# Copyright (c) 2013, 2016 by Delphix. All rights reserved.
30#
31
32. $STF_SUITE/include/libtest.shlib
33. $STF_SUITE/tests/functional/reservation/reservation.shlib
34
35#
36# DESCRIPTION:
37#
38# Setting a reservation reserves a defined minimum amount of space for
39# a dataset, and prevents other datasets using that space. Verify that
40# reducing the reservation on a filesystem allows other datasets in
41# the pool to use that space.
42#
43# STRATEGY:
44# 1) Create multiple filesystems
45# 2) Set reservations on all bar one of the filesystems
46# 3) Fill up the one non-reserved filesystem
47# 4) Reduce one of the reservations and verify can write more
48# data into the non-reserved filesystem
49#
50
51verify_runnable "both"
52
53log_assert "Verify reducing reservation allows other datasets to use space"
54
55function cleanup
56{
57	typeset -i loop=0
58	while (($loop < $RESV_NUM_FS)); do
59		datasetexists $TESTPOOL/${TESTFS}$loop && \
60		    log_must zfs destroy -f $TESTPOOL/${TESTFS}$loop
61
62		[[ -d ${TESTDIR}$loop ]] && log_must rm -r ${TESTDIR}$loop
63
64		((loop = loop + 1))
65	done
66}
67
68log_onexit cleanup
69
70log_must create_multiple_fs $RESV_NUM_FS $TESTPOOL/$TESTFS $TESTDIR
71
72space_avail=`get_prop available $TESTPOOL`
73space_used=`get_prop used $TESTPOOL`
74
75#
76# To make sure this test doesn't take too long to execute on
77# large pools, we calculate a reservation setting which when
78# applied to all bar one of the filesystems (RESV_NUM_FS-1) will
79# ensure we have RESV_FREE_SPACE left free in the pool, which we will
80# be able to quickly fill.
81#
82resv_space_avail=`expr $space_avail - $RESV_FREE_SPACE`
83num_resv_fs=`expr $RESV_NUM_FS - 1` # Number of FS to which resv will be applied
84resv_size_set=`expr $resv_space_avail / $num_resv_fs`
85
86#
87# We set the reservations now, rather than when we created the filesystems
88# to allow us to take into account space used by the filsystem metadata
89#
90# Note we don't set a reservation on the first filesystem we created,
91# hence num=1 rather than zero below.
92#
93typeset -i num=1
94while (($num < $RESV_NUM_FS)); do
95	log_must zfs set reservation=$resv_size_set $TESTPOOL/$TESTFS$num
96	((num = num + 1))
97done
98
99space_avail_still=`get_prop available $TESTPOOL`
100
101fill_size=`expr $space_avail_still + $RESV_TOLERANCE`
102write_count=`expr $fill_size / $BLOCK_SIZE`
103
104# Now fill up the first filesystem (which doesn't have a reservation set
105# and thus will use up whatever free space is left in the pool).
106num=0
107log_note "Writing to $TESTDIR$num/$TESTFILE1"
108
109file_write -o create -f $TESTDIR$num/$TESTFILE1 -b $BLOCK_SIZE \
110    -c $write_count -d 0
111ret=$?
112if (($ret != $ENOSPC)); then
113	log_fail "Did not get ENOSPC as expected (got $ret)."
114fi
115
116# Remove the reservation on one of the other filesystems and verify
117# can write more data to the original non-reservation filesystem.
118num=1
119log_must zfs set reservation=none $TESTPOOL/${TESTFS}$num
120num=0
121log_must file_write -o create -f ${TESTDIR}$num/$TESTFILE2 -b pagesize \
122    -c 1000 -d 0
123
124log_pass "reducing reservation allows other datasets to use space"
125