1#!/bin/ksh -p
2#
3# CDDL HEADER START
4#
5# This file and its contents are supplied under the terms of the
6# Common Development and Distribution License ("CDDL"), version 1.0.
7# You may only use this file in accordance with the terms of version
8# 1.0 of the CDDL.
9#
10# A full copy of the text of the CDDL should have accompanied this
11# source.  A copy of the CDDL is also available via the Internet at
12# http://www.illumos.org/license/CDDL.
13#
14# CDDL HEADER END
15#
16
17#
18# Copyright (c) 2020, George Amanakis. All rights reserved.
19#
20
21. $STF_SUITE/include/libtest.shlib
22. $STF_SUITE/tests/functional/l2arc/l2arc.cfg
23
24#
25# DESCRIPTION:
26#	Persistent L2ARC with an unencrypted ZFS file system succeeds
27#
28# STRATEGY:
29#	1. Create pool with a cache device.
30#	2. Export and re-import pool without writing any data.
31#	3. Create a random file in that pool and random read for 10 sec.
32#	4. Export pool.
33#	5. Read the amount of log blocks written from the header of the
34#		L2ARC device.
35#	6. Import pool.
36#	7. Read the amount of log blocks rebuilt in arcstats and compare to
37#		(5).
38#	8. Check if the labels of the L2ARC device are intact.
39#
40#	* We can predict the minimum bytes of L2ARC restored if we subtract
41#	from the effective size of the cache device the bytes l2arc_evict()
42#	evicts:
43#	l2: L2ARC device size - VDEV_LABEL_START_SIZE - l2ad_dev_hdr_asize
44#	wr_sz: l2arc_write_max + l2arc_write_boost (worst case)
45#	blk_overhead: wr_sz / SPA_MINBLOCKSIZE / (l2 / SPA_MAXBLOCKSIZE) *
46#		sizeof (l2arc_log_blk_phys_t)
47#	min restored size: l2 - (wr_sz + blk_overhead)
48#
49
50verify_runnable "global"
51
52command -v fio > /dev/null || log_unsupported "fio missing"
53
54log_assert "Persistent L2ARC with an unencrypted ZFS file system succeeds."
55
56function cleanup
57{
58	if poolexists $TESTPOOL ; then
59		destroy_pool $TESTPOOL
60	fi
61
62	log_must set_tunable32 L2ARC_NOPREFETCH $noprefetch
63	log_must set_tunable32 L2ARC_REBUILD_BLOCKS_MIN_L2SIZE \
64		$rebuild_blocks_min_l2size
65}
66log_onexit cleanup
67
68# L2ARC_NOPREFETCH is set to 0 to let L2ARC handle prefetches
69typeset noprefetch=$(get_tunable L2ARC_NOPREFETCH)
70typeset rebuild_blocks_min_l2size=$(get_tunable L2ARC_REBUILD_BLOCKS_MIN_L2SIZE)
71log_must set_tunable32 L2ARC_NOPREFETCH 0
72log_must set_tunable32 L2ARC_REBUILD_BLOCKS_MIN_L2SIZE 0
73
74typeset fill_mb=800
75typeset cache_sz=$(( floor($fill_mb / 2) ))
76export FILE_SIZE=$(( floor($fill_mb / $NUMJOBS) ))M
77
78log_must truncate -s ${cache_sz}M $VDEV_CACHE
79
80log_must zpool create -f $TESTPOOL $VDEV cache $VDEV_CACHE
81
82log_must zpool export $TESTPOOL
83log_must zpool import -d $VDIR $TESTPOOL
84
85log_must fio $FIO_SCRIPTS/mkfiles.fio
86log_must fio $FIO_SCRIPTS/random_reads.fio
87
88arcstat_quiescence_noecho l2_size
89log_must zpool export $TESTPOOL
90arcstat_quiescence_noecho l2_feeds
91
92typeset l2_dh_log_blk=$(zdb -l $VDEV_CACHE | awk '/log_blk_count/ {print $2}')
93
94typeset l2_rebuild_log_blk_start=$(get_arcstat l2_rebuild_log_blks)
95
96log_must zpool import -d $VDIR $TESTPOOL
97arcstat_quiescence_noecho l2_size
98
99typeset l2_rebuild_log_blk_end=$(arcstat_quiescence_echo l2_rebuild_log_blks)
100
101log_must test $l2_dh_log_blk -eq $(( $l2_rebuild_log_blk_end -
102	$l2_rebuild_log_blk_start ))
103log_must test $l2_dh_log_blk -gt 0
104
105log_must zpool offline $TESTPOOL $VDEV_CACHE
106arcstat_quiescence_noecho l2_size
107
108log_must zdb -lllq $VDEV_CACHE
109
110log_must zpool destroy -f $TESTPOOL
111
112log_pass "Persistent L2ARC with an unencrypted ZFS file system succeeds."
113