1#!/bin/ksh -p
2#
3# This file and its contents are supplied under the terms of the
4# Common Development and Distribution License ("CDDL"), version 1.0.
5# You may only use this file in accordance with the terms of version
6# 1.0 of the CDDL.
7#
8# A full copy of the text of the CDDL should have accompanied this
9# source.  A copy of the CDDL is also available via the Internet at
10# http://www.illumos.org/license/CDDL.
11#
12
13#
14# Copyright 2019 Joyent, Inc.
15#
16
17. $STF_SUITE/include/libtest.shlib
18. $STF_SUITE/tests/functional/refreserv/refreserv.cfg
19
20#
21# DESCRIPTION:
22#	raidz refreservation=auto accounts for extra parity and skip blocks
23#
24# STRATEGY:
25#	1. Create a pool with a single raidz vdev
26#	2. For each block size [512b, 1k, 128k] or [4k, 8k, 128k]
27#	    - create a volume
28#	    - fully overwrite it
29#	    - verify that referenced is less than or equal to reservation
30#	    - destroy the volume
31#	3. Destroy the pool
32#	4. Recreate the pool with one more disk in the vdev, then repeat steps
33#	   2 and 3.
34#	5. Repeat all steps above for raidz2 and raidz3.
35#
36# NOTES:
37#	1. This test will use up to 14 disks but can cover the key concepts with
38#	   5 disks.
39#	2. If the disks are a mixture of 4Kn and 512n/512e, failures are likely.
40#
41
42verify_runnable "global"
43
44typeset -a alldisks=($DISKS)
45
46# The larger the volsize, the better zvol_volsize_to_reservation() is at
47# guessing the right number.  At 10M on ashift=12, the estimate may be over 26%
48# too high.
49volsize=100
50
51function cleanup
52{
53	default_cleanup_noexit
54	default_setup_noexit "${alldisks[0]}"
55}
56
57log_assert "raidz refreservation=auto accounts for extra parity and skip blocks"
58log_onexit cleanup
59
60poolexists "$TESTPOOL" && log_must_busy zpool destroy "$TESTPOOL"
61
62# Testing tiny block sizes on ashift=12 pools causes so much size inflation
63# that small test disks may fill before creating small volumes.  However,
64# testing 512b and 1K blocks on ashift=9 pools is an ok approximation for
65# testing the problems that arise from 4K and 8K blocks on ashift=12 pools.
66if is_freebsd; then
67	bps=$(diskinfo -v ${alldisks[0]} | awk '/sectorsize/ { print $1 }')
68elif is_linux; then
69	bps=$(lsblk -nrdo min-io /dev/${alldisks[0]})
70fi
71log_must test "$bps" -eq 512 -o "$bps" -eq 4096
72case "$bps" in
73512)
74	allshifts=(9 10 17)
75	maxpct=151
76	;;
774096)
78	allshifts=(12 13 17)
79	maxpct=110
80	;;
81*)
82	log_fail "bytes/sector: $bps != (512|4096)"
83	;;
84esac
85log_note "Testing in ashift=${allshifts[0]} mode"
86
87# This loop handles all iterations of steps 1 through 4 described in strategy
88# comment above,
89for parity in 1 2 3; do
90	raid=raidz$parity
91
92	# Ensure we hit scenarios with and without skip blocks
93	for ndisks in $((parity * 2)) $((parity * 2 + 1)); do
94		typeset -a disks=(${alldisks[0..$((ndisks - 1))]})
95
96		if (( ${#disks[@]} < ndisks )); then
97			log_note "Too few disks to test $raid-$ndisks"
98			continue
99		fi
100
101		log_must zpool create -O compression=off "$TESTPOOL" "$raid" "${disks[@]}"
102
103		for bits in "${allshifts[@]}"; do
104			vbs=$((1 << bits))
105			log_note "Testing $raid-$ndisks volblocksize=$vbs"
106
107			vol=$TESTPOOL/$TESTVOL
108			log_must zfs create -V ${volsize}m \
109			    -o volblocksize=$vbs "$vol"
110			block_device_wait "/dev/zvol/$vol"
111			log_must dd if=/dev/zero of=/dev/zvol/$vol \
112			    bs=1024k count=$volsize
113			sync_pool $TESTPOOL
114
115			ref=$(zfs get -Hpo value referenced "$vol")
116			refres=$(zfs get -Hpo value refreservation "$vol")
117			log_must test -n "$ref"
118			log_must test -n "$refres"
119
120			typeset -F2 deltapct=$((refres * 100.0 / ref))
121			log_note "$raid-$ndisks refreservation $refres" \
122			    "is $deltapct% of reservation $res"
123
124			log_must test "$ref" -le "$refres"
125			log_must test "$deltapct" -le $maxpct
126
127			log_must_busy zfs destroy "$vol"
128			block_device_wait
129		done
130
131		log_must_busy zpool destroy "$TESTPOOL"
132	done
133done
134
135log_pass "raidz refreservation=auto accounts for extra parity and skip blocks"
136