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 2008 Sun Microsystems, Inc.  All rights reserved.
25# Use is subject to license terms.
26#
27
28#
29# Copyright (c) 2016 by Delphix. All rights reserved.
30#
31
32. $STF_SUITE/include/libtest.shlib
33
34#
35# DESCRIPTION:
36#	Verify recursive snapshotting could not break ZFS.
37#
38# STRATEGY:
39#	1. Create deeply-nested filesystems until it is too long to create snap
40#	2. Verify zfs snapshot -r pool@snap will not break ZFS
41#
42
43verify_runnable "both"
44
45function cleanup
46{
47	datasetexists $initfs && destroy_dataset $initfs -rf
48}
49
50log_assert "Verify recursive snapshotting could not break ZFS."
51log_onexit cleanup
52
53initfs=$TESTPOOL/$TESTFS/$TESTFS
54basefs=$initfs
55typeset -i ret=0 len snaplen
56while ((ret == 0)); do
57	zfs create $basefs
58	zfs snapshot $basefs@snap1
59	ret=$?
60
61	if ((ret != 0)); then
62		len=${#basefs}
63		log_note "The deeply-nested filesystem len: $len"
64
65		#
66		# Make sure there are at least 2 characters left
67		# for snapshot name space, otherwise snapshot name
68		# is incorrect
69		#
70		if ((len >= 255)); then
71			datasetexists $basefs && destroy_dataset $basefs -r
72			basefs=${basefs%/*}
73			len=${#basefs}
74		fi
75		break
76	fi
77
78	basefs=$basefs/$TESTFS
79done
80
81# Make snapshot name is longer than the max length
82((snaplen = 256 - len + 10))
83snap=$(gen_dataset_name $snaplen "s")
84log_mustnot zfs snapshot -r $TESTPOOL@$snap
85
86log_must datasetnonexists $TESTPOOL@$snap
87while [[ $basefs != $TESTPOOL ]]; do
88	log_must datasetnonexists $basefs@$snap
89	basefs=${basefs%/*}
90done
91
92log_pass "Verify recursive snapshotting could not break ZFS."
93