1#!/bin/ksh -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 https://opensource.org/licenses/CDDL-1.0.
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# In pool with a full filesystem and another filesystem with a reservation
39# setting the reservation on the second filesystem to 'none' should allow more
40# data to be written to the first filesystem.
41#
42#
43# STRATEGY:
44# 1) Create a filesystem as a dataset
45# 2) Create a filesystem at the same level
46# 3) Set a reservation on the dataset filesystem
47# 4) Fill up the filesystem
48# 5) Set the reservation on the dataset filesystem to 'none'
49# 6) Verify we can write more data to the first filesystem
50#
51
52verify_runnable "both"
53
54log_assert "Setting top level dataset reservation to 'none' allows more data " \
55    "to be written to top level filesystem"
56
57function cleanup
58{
59	log_must rm -rf $TESTDIR/$TESTFILE1
60	log_must rm -rf $TESTDIR/$TESTFILE2
61
62	datasetexists $TESTPOOL/$TESTFS1 && \
63		destroy_dataset $TESTPOOL/$TESTFS1 -f
64}
65
66log_onexit cleanup
67
68log_must zfs create $TESTPOOL/$TESTFS1
69
70space_avail=`get_prop available $TESTPOOL`
71
72#
73# To make sure this test doesn't take too long to execute on
74# large pools, we calculate a reservation setting which when
75# applied to the dataset will ensure we have RESV_FREE_SPACE
76# left free in the pool which we can quickly fill.
77#
78((resv_size_set = space_avail - RESV_FREE_SPACE))
79
80log_must zfs set reservation=$resv_size_set $TESTPOOL/$TESTFS1
81
82space_avail_still=`get_prop available $TESTPOOL`
83
84fill_size=`expr $space_avail_still + $RESV_TOLERANCE`
85write_count=`expr $fill_size / $BLOCK_SIZE`
86
87# Now fill up the filesystem (which doesn't have a reservation set
88# and thus will use up whatever free space is left in the pool).
89file_write -o create -f $TESTDIR/$TESTFILE1 -b $BLOCK_SIZE \
90        -c $write_count -d 0
91ret=$?
92if (($ret != $ENOSPC)); then
93	log_fail "Did not get ENOSPC as expected (got $ret)."
94fi
95
96log_must zfs set reservation=none $TESTPOOL/$TESTFS1
97
98log_must file_write -o create -f $TESTDIR/$TESTFILE2 \
99    -b $(getconf PAGESIZE) -c 1000 -d 0
100
101log_pass "Setting top level dataset reservation to 'none' allows more " \
102    "data to be written to the top level filesystem"
103