Fix `zfs set atime|relatime=off|on` behavior on inherited datasets

[mirror_zfs.git] / tests / zfs-tests / include / libtest.shlib

#
# CDDL HEADER START
#
# The contents of this file are subject to the terms of the
# Common Development and Distribution License (the "License").
# You may not use this file except in compliance with the License.
#
# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
# or http://www.opensolaris.org/os/licensing.
# See the License for the specific language governing permissions
# and limitations under the License.
#
# When distributing Covered Code, include this CDDL HEADER in each
# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
# If applicable, add the following below this CDDL HEADER, with the
# fields enclosed by brackets "[]" replaced with your own identifying
# information: Portions Copyright [yyyy] [name of copyright owner]
#
# CDDL HEADER END
#

#
# Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
# Use is subject to license terms.
# Copyright (c) 2012, 2017 by Delphix. All rights reserved.
# Copyright (c) 2017 by Tim Chase. All rights reserved.
# Copyright (c) 2017 by Nexenta Systems, Inc. All rights reserved.
# Copyright (c) 2017 Lawrence Livermore National Security, LLC.
# Copyright (c) 2017 Datto Inc.
# Copyright (c) 2017 Open-E, Inc. All Rights Reserved.
# Use is subject to license terms.
#

. ${STF_TOOLS}/include/logapi.shlib
. ${STF_SUITE}/include/math.shlib
. ${STF_SUITE}/include/blkdev.shlib

#
# Apply constrained path when available.  This is required since the
# PATH may have been modified by sudo's secure_path behavior.
#
if [ -n "$STF_PATH" ]; then
        PATH="$STF_PATH"
fi

#
# Generic dot version comparison function
#
# Returns success when version $1 is greater than or equal to $2.
#
function compare_version_gte
{
        if [[ "$(printf "$1\n$2" | sort -V | tail -n1)" == "$1" ]]; then
                return 0
        else
                return 1
        fi
}

# Linux kernel version comparison function
#
# $1 Linux version ("4.10", "2.6.32") or blank for installed Linux version
#
# Used for comparison: if [ $(linux_version) -ge $(linux_version "2.6.32") ]
#
function linux_version
{
        typeset ver="$1"

        [[ -z "$ver" ]] && ver=$(uname -r | grep -Eo "^[0-9]+\.[0-9]+\.[0-9]+")

        typeset version=$(echo $ver | cut -d '.' -f 1)
        typeset major=$(echo $ver | cut -d '.' -f 2)
        typeset minor=$(echo $ver | cut -d '.' -f 3)

        [[ -z "$version" ]] && version=0
        [[ -z "$major" ]] && major=0
        [[ -z "$minor" ]] && minor=0

        echo $((version * 10000 + major * 100 + minor))
}

# Determine if this is a Linux test system
#
# Return 0 if platform Linux, 1 if otherwise

function is_linux
{
        if [[ $(uname -o) == "GNU/Linux" ]]; then
                return 0
        else
                return 1
        fi
}

# Determine if this is a 32-bit system
#
# Return 0 if platform is 32-bit, 1 if otherwise

function is_32bit
{
        if [[ $(getconf LONG_BIT) == "32" ]]; then
                return 0
        else
                return 1
        fi
}

# Determine if kmemleak is enabled
#
# Return 0 if kmemleak is enabled, 1 if otherwise

function is_kmemleak
{
        if is_linux && [[ -e /sys/kernel/debug/kmemleak ]]; then
                return 0
        else
                return 1
        fi
}

# Determine whether a dataset is mounted
#
# $1 dataset name
# $2 filesystem type; optional - defaulted to zfs
#
# Return 0 if dataset is mounted; 1 if unmounted; 2 on error

function ismounted
{
        typeset fstype=$2
        [[ -z $fstype ]] && fstype=zfs
        typeset out dir name ret

        case $fstype in
                zfs)
                        if [[ "$1" == "/"* ]] ; then
                                for out in $(zfs mount | awk '{print $2}'); do
                                        [[ $1 == $out ]] && return 0
                                done
                        else
                                for out in $(zfs mount | awk '{print $1}'); do
                                        [[ $1 == $out ]] && return 0
                                done
                        fi
                ;;
                ufs|nfs)
                        out=$(df -F $fstype $1 2>/dev/null)
                        ret=$?
                        (($ret != 0)) && return $ret

                        dir=${out%%\(*}
                        dir=${dir%% *}
                        name=${out##*\(}
                        name=${name%%\)*}
                        name=${name%% *}

                        [[ "$1" == "$dir" || "$1" == "$name" ]] && return 0
                ;;
                ext*)
                        out=$(df -t $fstype $1 2>/dev/null)
                        return $?
                ;;
                zvol)
                        if [[ -L "$ZVOL_DEVDIR/$1" ]]; then
                                link=$(readlink -f $ZVOL_DEVDIR/$1)
                                [[ -n "$link" ]] && \
                                        mount | grep -q "^$link" && \
                                                return 0
                        fi
                ;;
        esac

        return 1
}

# Return 0 if a dataset is mounted; 1 otherwise
#
# $1 dataset name
# $2 filesystem type; optional - defaulted to zfs

function mounted
{
        ismounted $1 $2
        (($? == 0)) && return 0
        return 1
}

# Return 0 if a dataset is unmounted; 1 otherwise
#
# $1 dataset name
# $2 filesystem type; optional - defaulted to zfs

function unmounted
{
        ismounted $1 $2
        (($? == 1)) && return 0
        return 1
}

# split line on ","
#
# $1 - line to split

function splitline
{
        echo $1 | sed "s/,/ /g"
}

function default_setup
{
        default_setup_noexit "$@"

        log_pass
}

function default_setup_no_mountpoint
{
        default_setup_noexit "$1" "$2" "$3" "yes"

        log_pass
}

#
# Given a list of disks, setup storage pools and datasets.
#
function default_setup_noexit
{
        typeset disklist=$1
        typeset container=$2
        typeset volume=$3
        typeset no_mountpoint=$4
        log_note begin default_setup_noexit

        if is_global_zone; then
                if poolexists $TESTPOOL ; then
                        destroy_pool $TESTPOOL
                fi
                [[ -d /$TESTPOOL ]] && rm -rf /$TESTPOOL
                log_must zpool create -f $TESTPOOL $disklist
        else
                reexport_pool
        fi

        rm -rf $TESTDIR  || log_unresolved Could not remove $TESTDIR
        mkdir -p $TESTDIR || log_unresolved Could not create $TESTDIR

        log_must zfs create $TESTPOOL/$TESTFS
        if [[ -z $no_mountpoint ]]; then
                log_must zfs set mountpoint=$TESTDIR $TESTPOOL/$TESTFS
        fi

        if [[ -n $container ]]; then
                rm -rf $TESTDIR1  || \
                        log_unresolved Could not remove $TESTDIR1
                mkdir -p $TESTDIR1 || \
                        log_unresolved Could not create $TESTDIR1

                log_must zfs create $TESTPOOL/$TESTCTR
                log_must zfs set canmount=off $TESTPOOL/$TESTCTR
                log_must zfs create $TESTPOOL/$TESTCTR/$TESTFS1
                if [[ -z $no_mountpoint ]]; then
                        log_must zfs set mountpoint=$TESTDIR1 \
                            $TESTPOOL/$TESTCTR/$TESTFS1
                fi
        fi

        if [[ -n $volume ]]; then
                if is_global_zone ; then
                        log_must zfs create -V $VOLSIZE $TESTPOOL/$TESTVOL
                        block_device_wait
                else
                        log_must zfs create $TESTPOOL/$TESTVOL
                fi
        fi
}

#
# Given a list of disks, setup a storage pool, file system and
# a container.
#
function default_container_setup
{
        typeset disklist=$1

        default_setup "$disklist" "true"
}

#
# Given a list of disks, setup a storage pool,file system
# and a volume.
#
function default_volume_setup
{
        typeset disklist=$1

        default_setup "$disklist" "" "true"
}

#
# Given a list of disks, setup a storage pool,file system,
# a container and a volume.
#
function default_container_volume_setup
{
        typeset disklist=$1

        default_setup "$disklist" "true" "true"
}

#
# Create a snapshot on a filesystem or volume. Defaultly create a snapshot on
# filesystem
#
# $1 Existing filesystem or volume name. Default, $TESTPOOL/$TESTFS
# $2 snapshot name. Default, $TESTSNAP
#
function create_snapshot
{
        typeset fs_vol=${1:-$TESTPOOL/$TESTFS}
        typeset snap=${2:-$TESTSNAP}

        [[ -z $fs_vol ]] && log_fail "Filesystem or volume's name is undefined."
        [[ -z $snap ]] && log_fail "Snapshot's name is undefined."

        if snapexists $fs_vol@$snap; then
                log_fail "$fs_vol@$snap already exists."
        fi
        datasetexists $fs_vol || \
                log_fail "$fs_vol must exist."

        log_must zfs snapshot $fs_vol@$snap
}

#
# Create a clone from a snapshot, default clone name is $TESTCLONE.
#
# $1 Existing snapshot, $TESTPOOL/$TESTFS@$TESTSNAP is default.
# $2 Clone name, $TESTPOOL/$TESTCLONE is default.
#
function create_clone   # snapshot clone
{
        typeset snap=${1:-$TESTPOOL/$TESTFS@$TESTSNAP}
        typeset clone=${2:-$TESTPOOL/$TESTCLONE}

        [[ -z $snap ]] && \
                log_fail "Snapshot name is undefined."
        [[ -z $clone ]] && \
                log_fail "Clone name is undefined."

        log_must zfs clone $snap $clone
}

#
# Create a bookmark of the given snapshot.  Defaultly create a bookmark on
# filesystem.
#
# $1 Existing filesystem or volume name. Default, $TESTFS
# $2 Existing snapshot name. Default, $TESTSNAP
# $3 bookmark name. Default, $TESTBKMARK
#
function create_bookmark
{
        typeset fs_vol=${1:-$TESTFS}
        typeset snap=${2:-$TESTSNAP}
        typeset bkmark=${3:-$TESTBKMARK}

        [[ -z $fs_vol ]] && log_fail "Filesystem or volume's name is undefined."
        [[ -z $snap ]] && log_fail "Snapshot's name is undefined."
        [[ -z $bkmark ]] && log_fail "Bookmark's name is undefined."

        if bkmarkexists $fs_vol#$bkmark; then
                log_fail "$fs_vol#$bkmark already exists."
        fi
        datasetexists $fs_vol || \
                log_fail "$fs_vol must exist."
        snapexists $fs_vol@$snap || \
                log_fail "$fs_vol@$snap must exist."

        log_must zfs bookmark $fs_vol@$snap $fs_vol#$bkmark
}

#
# Create a temporary clone result of an interrupted resumable 'zfs receive'
# $1 Destination filesystem name. Must not exist, will be created as the result
#    of this function along with its %recv temporary clone
# $2 Source filesystem name. Must not exist, will be created and destroyed
#
function create_recv_clone
{
        typeset recvfs="$1"
        typeset sendfs="${2:-$TESTPOOL/create_recv_clone}"
        typeset snap="$sendfs@snap1"
        typeset incr="$sendfs@snap2"
        typeset mountpoint="$TESTDIR/create_recv_clone"
        typeset sendfile="$TESTDIR/create_recv_clone.zsnap"

        [[ -z $recvfs ]] && log_fail "Recv filesystem's name is undefined."

        datasetexists $recvfs && log_fail "Recv filesystem must not exist."
        datasetexists $sendfs && log_fail "Send filesystem must not exist."

        log_must zfs create -o mountpoint="$mountpoint" $sendfs
        log_must zfs snapshot $snap
        log_must eval "zfs send $snap | zfs recv -u $recvfs"
        log_must mkfile 1m "$mountpoint/data"
        log_must zfs snapshot $incr
        log_must eval "zfs send -i $snap $incr | dd bs=10K count=1 > $sendfile"
        log_mustnot eval "zfs recv -su $recvfs < $sendfile"
        destroy_dataset "$sendfs" "-r"
        log_must rm -f "$sendfile"

        if [[ $(get_prop 'inconsistent' "$recvfs/%recv") -ne 1 ]]; then
                log_fail "Error creating temporary $recvfs/%recv clone"
        fi
}

function default_mirror_setup
{
        default_mirror_setup_noexit $1 $2 $3

        log_pass
}

#
# Given a pair of disks, set up a storage pool and dataset for the mirror
# @parameters: $1 the primary side of the mirror
#   $2 the secondary side of the mirror
# @uses: ZPOOL ZFS TESTPOOL TESTFS
function default_mirror_setup_noexit
{
        readonly func="default_mirror_setup_noexit"
        typeset primary=$1
        typeset secondary=$2

        [[ -z $primary ]] && \
                log_fail "$func: No parameters passed"
        [[ -z $secondary ]] && \
                log_fail "$func: No secondary partition passed"
        [[ -d /$TESTPOOL ]] && rm -rf /$TESTPOOL
        log_must zpool create -f $TESTPOOL mirror $@
        log_must zfs create $TESTPOOL/$TESTFS
        log_must zfs set mountpoint=$TESTDIR $TESTPOOL/$TESTFS
}

#
# create a number of mirrors.
# We create a number($1) of 2 way mirrors using the pairs of disks named
# on the command line. These mirrors are *not* mounted
# @parameters: $1 the number of mirrors to create
#  $... the devices to use to create the mirrors on
# @uses: ZPOOL ZFS TESTPOOL
function setup_mirrors
{
        typeset -i nmirrors=$1

        shift
        while ((nmirrors > 0)); do
                log_must test -n "$1" -a -n "$2"
                [[ -d /$TESTPOOL$nmirrors ]] && rm -rf /$TESTPOOL$nmirrors
                log_must zpool create -f $TESTPOOL$nmirrors mirror $1 $2
                shift 2
                ((nmirrors = nmirrors - 1))
        done
}

#
# create a number of raidz pools.
# We create a number($1) of 2 raidz pools  using the pairs of disks named
# on the command line. These pools are *not* mounted
# @parameters: $1 the number of pools to create
#  $... the devices to use to create the pools on
# @uses: ZPOOL ZFS TESTPOOL
function setup_raidzs
{
        typeset -i nraidzs=$1

        shift
        while ((nraidzs > 0)); do
                log_must test -n "$1" -a -n "$2"
                [[ -d /$TESTPOOL$nraidzs ]] && rm -rf /$TESTPOOL$nraidzs
                log_must zpool create -f $TESTPOOL$nraidzs raidz $1 $2
                shift 2
                ((nraidzs = nraidzs - 1))
        done
}

#
# Destroy the configured testpool mirrors.
# the mirrors are of the form ${TESTPOOL}{number}
# @uses: ZPOOL ZFS TESTPOOL
function destroy_mirrors
{
        default_cleanup_noexit

        log_pass
}

#
# Given a minimum of two disks, set up a storage pool and dataset for the raid-z
# $1 the list of disks
#
function default_raidz_setup
{
        typeset disklist="$*"
        disks=(${disklist[*]})

        if [[ ${#disks[*]} -lt 2 ]]; then
                log_fail "A raid-z requires a minimum of two disks."
        fi

        [[ -d /$TESTPOOL ]] && rm -rf /$TESTPOOL
        log_must zpool create -f $TESTPOOL raidz $disklist
        log_must zfs create $TESTPOOL/$TESTFS
        log_must zfs set mountpoint=$TESTDIR $TESTPOOL/$TESTFS

        log_pass
}

#
# Common function used to cleanup storage pools and datasets.
#
# Invoked at the start of the test suite to ensure the system
# is in a known state, and also at the end of each set of
# sub-tests to ensure errors from one set of tests doesn't
# impact the execution of the next set.

function default_cleanup
{
        default_cleanup_noexit

        log_pass
}

#
# Utility function used to list all available pool names.
#
# NOTE: $KEEP is a variable containing pool names, separated by a newline
# character, that must be excluded from the returned list.
#
function get_all_pools
{
        zpool list -H -o name | grep -Fvx "$KEEP" | grep -v "$NO_POOLS"
}

function default_cleanup_noexit
{
        typeset pool=""
        #
        # Destroying the pool will also destroy any
        # filesystems it contains.
        #
        if is_global_zone; then
                zfs unmount -a > /dev/null 2>&1
                ALL_POOLS=$(get_all_pools)
                # Here, we loop through the pools we're allowed to
                # destroy, only destroying them if it's safe to do
                # so.
                while [ ! -z ${ALL_POOLS} ]
                do
                        for pool in ${ALL_POOLS}
                        do
                                if safe_to_destroy_pool $pool ;
                                then
                                        destroy_pool $pool
                                fi
                                ALL_POOLS=$(get_all_pools)
                        done
                done

                zfs mount -a
        else
                typeset fs=""
                for fs in $(zfs list -H -o name \
                    | grep "^$ZONE_POOL/$ZONE_CTR[01234]/"); do
                        destroy_dataset "$fs" "-Rf"
                done

                # Need cleanup here to avoid garbage dir left.
                for fs in $(zfs list -H -o name); do
                        [[ $fs == /$ZONE_POOL ]] && continue
                        [[ -d $fs ]] && log_must rm -rf $fs/*
                done

                #
                # Reset the $ZONE_POOL/$ZONE_CTR[01234] file systems property to
                # the default value
                #
                for fs in $(zfs list -H -o name); do
                        if [[ $fs == $ZONE_POOL/$ZONE_CTR[01234] ]]; then
                                log_must zfs set reservation=none $fs
                                log_must zfs set recordsize=128K $fs
                                log_must zfs set mountpoint=/$fs $fs
                                typeset enc=""
                                enc=$(get_prop encryption $fs)
                                if [[ $? -ne 0 ]] || [[ -z "$enc" ]] || \
                                        [[ "$enc" == "off" ]]; then
                                        log_must zfs set checksum=on $fs
                                fi
                                log_must zfs set compression=off $fs
                                log_must zfs set atime=on $fs
                                log_must zfs set devices=off $fs
                                log_must zfs set exec=on $fs
                                log_must zfs set setuid=on $fs
                                log_must zfs set readonly=off $fs
                                log_must zfs set snapdir=hidden $fs
                                log_must zfs set aclmode=groupmask $fs
                                log_must zfs set aclinherit=secure $fs
                        fi
                done
        fi

        [[ -d $TESTDIR ]] && \
                log_must rm -rf $TESTDIR

        disk1=${DISKS%% *}
        if is_mpath_device $disk1; then
                delete_partitions
        fi

        rm -f $TEST_BASE_DIR/{err,out}
}


#
# Common function used to cleanup storage pools, file systems
# and containers.
#
function default_container_cleanup
{
        if ! is_global_zone; then
                reexport_pool
        fi

        ismounted $TESTPOOL/$TESTCTR/$TESTFS1
        [[ $? -eq 0 ]] && \
            log_must zfs unmount $TESTPOOL/$TESTCTR/$TESTFS1

        destroy_dataset "$TESTPOOL/$TESTCTR/$TESTFS1" "-R"
        destroy_dataset "$TESTPOOL/$TESTCTR" "-Rf"

        [[ -e $TESTDIR1 ]] && \
            log_must rm -rf $TESTDIR1 > /dev/null 2>&1

        default_cleanup
}

#
# Common function used to cleanup snapshot of file system or volume. Default to
# delete the file system's snapshot
#
# $1 snapshot name
#
function destroy_snapshot
{
        typeset snap=${1:-$TESTPOOL/$TESTFS@$TESTSNAP}

        if ! snapexists $snap; then
                log_fail "'$snap' does not exist."
        fi

        #
        # For the sake of the value which come from 'get_prop' is not equal
        # to the really mountpoint when the snapshot is unmounted. So, firstly
        # check and make sure this snapshot's been mounted in current system.
        #
        typeset mtpt=""
        if ismounted $snap; then
                mtpt=$(get_prop mountpoint $snap)
                (($? != 0)) && \
                        log_fail "get_prop mountpoint $snap failed."
        fi

        destroy_dataset "$snap"
        [[ $mtpt != "" && -d $mtpt ]] && \
                log_must rm -rf $mtpt
}

#
# Common function used to cleanup clone.
#
# $1 clone name
#
function destroy_clone
{
        typeset clone=${1:-$TESTPOOL/$TESTCLONE}

        if ! datasetexists $clone; then
                log_fail "'$clone' does not existed."
        fi

        # With the same reason in destroy_snapshot
        typeset mtpt=""
        if ismounted $clone; then
                mtpt=$(get_prop mountpoint $clone)
                (($? != 0)) && \
                        log_fail "get_prop mountpoint $clone failed."
        fi

        destroy_dataset "$clone"
        [[ $mtpt != "" && -d $mtpt ]] && \
                log_must rm -rf $mtpt
}

#
# Common function used to cleanup bookmark of file system or volume.  Default
# to delete the file system's bookmark.
#
# $1 bookmark name
#
function destroy_bookmark
{
        typeset bkmark=${1:-$TESTPOOL/$TESTFS#$TESTBKMARK}

        if ! bkmarkexists $bkmark; then
                log_fail "'$bkmarkp' does not existed."
        fi

        destroy_dataset "$bkmark"
}

# Return 0 if a snapshot exists; $? otherwise
#
# $1 - snapshot name

function snapexists
{
        zfs list -H -t snapshot "$1" > /dev/null 2>&1
        return $?
}

#
# Return 0 if a bookmark exists; $? otherwise
#
# $1 - bookmark name
#
function bkmarkexists
{
        zfs list -H -t bookmark "$1" > /dev/null 2>&1
        return $?
}

#
# Set a property to a certain value on a dataset.
# Sets a property of the dataset to the value as passed in.
# @param:
#       $1 dataset who's property is being set
#       $2 property to set
#       $3 value to set property to
# @return:
#       0 if the property could be set.
#       non-zero otherwise.
# @use: ZFS
#
function dataset_setprop
{
        typeset fn=dataset_setprop

        if (($# < 3)); then
                log_note "$fn: Insufficient parameters (need 3, had $#)"
                return 1
        fi
        typeset output=
        output=$(zfs set $2=$3 $1 2>&1)
        typeset rv=$?
        if ((rv != 0)); then
                log_note "Setting property on $1 failed."
                log_note "property $2=$3"
                log_note "Return Code: $rv"
                log_note "Output: $output"
                return $rv
        fi
        return 0
}

#
# Assign suite defined dataset properties.
# This function is used to apply the suite's defined default set of
# properties to a dataset.
# @parameters: $1 dataset to use
# @uses: ZFS COMPRESSION_PROP CHECKSUM_PROP
# @returns:
#   0 if the dataset has been altered.
#   1 if no pool name was passed in.
#   2 if the dataset could not be found.
#   3 if the dataset could not have it's properties set.
#
function dataset_set_defaultproperties
{
        typeset dataset="$1"

        [[ -z $dataset ]] && return 1

        typeset confset=
        typeset -i found=0
        for confset in $(zfs list); do
                if [[ $dataset = $confset ]]; then
                        found=1
                        break
                fi
        done
        [[ $found -eq 0 ]] && return 2
        if [[ -n $COMPRESSION_PROP ]]; then
                dataset_setprop $dataset compression $COMPRESSION_PROP || \
                        return 3
                log_note "Compression set to '$COMPRESSION_PROP' on $dataset"
        fi
        if [[ -n $CHECKSUM_PROP ]]; then
                dataset_setprop $dataset checksum $CHECKSUM_PROP || \
                        return 3
                log_note "Checksum set to '$CHECKSUM_PROP' on $dataset"
        fi
        return 0
}

#
# Check a numeric assertion
# @parameter: $@ the assertion to check
# @output: big loud notice if assertion failed
# @use: log_fail
#
function assert
{
        (($@)) || log_fail "$@"
}

#
# Function to format partition size of a disk
# Given a disk cxtxdx reduces all partitions
# to 0 size
#
function zero_partitions #<whole_disk_name>
{
        typeset diskname=$1
        typeset i

        if is_linux; then
                DSK=$DEV_DSKDIR/$diskname
                DSK=$(echo $DSK | sed -e "s|//|/|g")
                log_must parted $DSK -s -- mklabel gpt
                blockdev --rereadpt $DSK 2>/dev/null
                block_device_wait
        else
                for i in 0 1 3 4 5 6 7
                do
                        log_must set_partition $i "" 0mb $diskname
                done
        fi

        return 0
}

#
# Given a slice, size and disk, this function
# formats the slice to the specified size.
# Size should be specified with units as per
# the `format` command requirements eg. 100mb 3gb
#
# NOTE: This entire interface is problematic for the Linux parted utilty
# which requires the end of the partition to be specified.  It would be
# best to retire this interface and replace it with something more flexible.
# At the moment a best effort is made.
#
function set_partition #<slice_num> <slice_start> <size_plus_units>  <whole_disk_name>
{
        typeset -i slicenum=$1
        typeset start=$2
        typeset size=$3
        typeset disk=$4

        if is_linux; then
                if [[ -z $size || -z $disk ]]; then
                        log_fail "The size or disk name is unspecified."
                fi
                typeset size_mb=${size%%[mMgG]}

                size_mb=${size_mb%%[mMgG][bB]}
                if [[ ${size:1:1} == 'g' ]]; then
                        ((size_mb = size_mb * 1024))
                fi

                # Create GPT partition table when setting slice 0 or
                # when the device doesn't already contain a GPT label.
                parted $DEV_DSKDIR/$disk -s -- print 1 >/dev/null
                typeset ret_val=$?
                if [[ $slicenum -eq 0 || $ret_val -ne 0 ]]; then
                        parted $DEV_DSKDIR/$disk -s -- mklabel gpt
                        if [[ $? -ne 0 ]]; then
                                log_note "Failed to create GPT partition table on $disk"
                                return 1
                        fi
                fi

                # When no start is given align on the first cylinder.
                if [[ -z "$start" ]]; then
                        start=1
                fi

                # Determine the cylinder size for the device and using
                # that calculate the end offset in cylinders.
                typeset -i cly_size_kb=0
                cly_size_kb=$(parted -m $DEV_DSKDIR/$disk -s -- \
                        unit cyl print | head -3 | tail -1 | \
                        awk -F '[:k.]' '{print $4}')
                ((end = (size_mb * 1024 / cly_size_kb) + start))

                parted $DEV_DSKDIR/$disk -s -- \
                    mkpart part$slicenum ${start}cyl ${end}cyl
                if [[ $? -ne 0 ]]; then
                        log_note "Failed to create partition $slicenum on $disk"
                        return 1
                fi

                blockdev --rereadpt $DEV_DSKDIR/$disk 2>/dev/null
                block_device_wait
        else
                if [[ -z $slicenum || -z $size || -z $disk ]]; then
                        log_fail "The slice, size or disk name is unspecified."
                fi

                typeset format_file=/var/tmp/format_in.$$

                echo "partition" >$format_file
                echo "$slicenum" >> $format_file
                echo "" >> $format_file
                echo "" >> $format_file
                echo "$start" >> $format_file
                echo "$size" >> $format_file
                echo "label" >> $format_file
                echo "" >> $format_file
                echo "q" >> $format_file
                echo "q" >> $format_file

                format -e -s -d $disk -f $format_file
        fi

        typeset ret_val=$?
        rm -f $format_file
        if [[ $ret_val -ne 0 ]]; then
                log_note "Unable to format $disk slice $slicenum to $size"
                return 1
        fi
        return 0
}

#
# Delete all partitions on all disks - this is specifically for the use of multipath
# devices which currently can only be used in the test suite as raw/un-partitioned
# devices (ie a zpool cannot be created on a whole mpath device that has partitions)
#
function delete_partitions
{
        typeset -i j=1

        if [[ -z $DISK_ARRAY_NUM ]]; then
                DISK_ARRAY_NUM=$(echo ${DISKS} | nawk '{print NF}')
        fi
        if [[ -z $DISKSARRAY ]]; then
                DISKSARRAY=$DISKS
        fi

        if is_linux; then
                if (( $DISK_ARRAY_NUM == 1 )); then
                        while ((j < MAX_PARTITIONS)); do
                                parted $DEV_DSKDIR/$DISK -s rm $j \
                                    > /dev/null 2>&1
                                if (( $? == 1 )); then
                                        lsblk | egrep ${DISK}${SLICE_PREFIX}${j} > /dev/null
                                                if (( $? == 1 )); then
                                                        log_note "Partitions for $DISK should be deleted"
                                                else
                                                        log_fail "Partition for ${DISK}${SLICE_PREFIX}${j} not deleted"
                                                fi
                                                return 0
                                else
                                        lsblk | egrep ${DISK}${SLICE_PREFIX}${j} > /dev/null
                                                if (( $? == 0 )); then
                                                        log_fail "Partition for ${DISK}${SLICE_PREFIX}${j} not deleted"
                                                fi
                                fi
                                ((j = j+1))
                        done
                else
                        for disk in `echo $DISKSARRAY`; do
                                while ((j < MAX_PARTITIONS)); do
                                        parted $DEV_DSKDIR/$disk -s rm $j > /dev/null 2>&1
                                        if (( $? == 1 )); then
                                                lsblk | egrep ${disk}${SLICE_PREFIX}${j} > /dev/null
                                                if (( $? == 1 )); then
                                                        log_note "Partitions for $disk should be deleted"
                                                else
                                                        log_fail "Partition for ${disk}${SLICE_PREFIX}${j} not deleted"
                                                fi
                                                j=7
                                        else
                                                lsblk | egrep ${disk}${SLICE_PREFIX}${j} > /dev/null
                                                if (( $? == 0 )); then
                                                        log_fail "Partition for ${disk}${SLICE_PREFIX}${j} not deleted"
                                                fi
                                        fi
                                        ((j = j+1))
                                done
                                j=1
                        done
                fi
        fi
        return 0
}

#
# Get the end cyl of the given slice
#
function get_endslice #<disk> <slice>
{
        typeset disk=$1
        typeset slice=$2
        if [[ -z $disk || -z $slice ]] ; then
                log_fail "The disk name or slice number is unspecified."
        fi

        if is_linux; then
                endcyl=$(parted -s $DEV_DSKDIR/$disk -- unit cyl print | \
                        grep "part${slice}" | \
                        awk '{print $3}' | \
                        sed 's,cyl,,')
                ((endcyl = (endcyl + 1)))
        else
                disk=${disk#/dev/dsk/}
                disk=${disk#/dev/rdsk/}
                disk=${disk%s*}

                typeset -i ratio=0
                ratio=$(prtvtoc /dev/rdsk/${disk}s2 | \
                    grep "sectors\/cylinder" | \
                    awk '{print $2}')

                if ((ratio == 0)); then
                        return
                fi

                typeset -i endcyl=$(prtvtoc -h /dev/rdsk/${disk}s2 |
                    nawk -v token="$slice" '{if ($1==token) print $6}')

                ((endcyl = (endcyl + 1) / ratio))
        fi

        echo $endcyl
}


#
# Given a size,disk and total slice number,  this function formats the
# disk slices from 0 to the total slice number with the same specified
# size.
#
function partition_disk #<slice_size> <whole_disk_name> <total_slices>
{
        typeset -i i=0
        typeset slice_size=$1
        typeset disk_name=$2
        typeset total_slices=$3
        typeset cyl

        zero_partitions $disk_name
        while ((i < $total_slices)); do
                if ! is_linux; then
                        if ((i == 2)); then
                                ((i = i + 1))
                                continue
                        fi
                fi
                log_must set_partition $i "$cyl" $slice_size $disk_name
                cyl=$(get_endslice $disk_name $i)
                ((i = i+1))
        done
}

#
# This function continues to write to a filenum number of files into dirnum
# number of directories until either file_write returns an error or the
# maximum number of files per directory have been written.
#
# Usage:
# fill_fs [destdir] [dirnum] [filenum] [bytes] [num_writes] [data]
#
# Return value: 0 on success
#               non 0 on error
#
# Where :
#       destdir:    is the directory where everything is to be created under
#       dirnum:     the maximum number of subdirectories to use, -1 no limit
#       filenum:    the maximum number of files per subdirectory
#       bytes:      number of bytes to write
#       num_writes: numer of types to write out bytes
#       data:       the data that will be written
#
#       E.g.
#       file_fs /testdir 20 25 1024 256 0
#
# Note: bytes * num_writes equals the size of the testfile
#
function fill_fs # destdir dirnum filenum bytes num_writes data
{
        typeset destdir=${1:-$TESTDIR}
        typeset -i dirnum=${2:-50}
        typeset -i filenum=${3:-50}
        typeset -i bytes=${4:-8192}
        typeset -i num_writes=${5:-10240}
        typeset data=${6:-0}

        typeset -i odirnum=1
        typeset -i idirnum=0
        typeset -i fn=0
        typeset -i retval=0

        mkdir -p $destdir/$idirnum
        while (($odirnum > 0)); do
                if ((dirnum >= 0 && idirnum >= dirnum)); then
                        odirnum=0
                        break
                fi
                file_write -o create -f $destdir/$idirnum/$TESTFILE.$fn \
                    -b $bytes -c $num_writes -d $data
                retval=$?
                if (($retval != 0)); then
                        odirnum=0
                        break
                fi
                if (($fn >= $filenum)); then
                        fn=0
                        ((idirnum = idirnum + 1))
                        mkdir -p $destdir/$idirnum
                else
                        ((fn = fn + 1))
                fi
        done
        return $retval
}

#
# Simple function to get the specified property. If unable to
# get the property then exits.
#
# Note property is in 'parsable' format (-p)
#
function get_prop # property dataset
{
        typeset prop_val
        typeset prop=$1
        typeset dataset=$2

        prop_val=$(zfs get -pH -o value $prop $dataset 2>/dev/null)
        if [[ $? -ne 0 ]]; then
                log_note "Unable to get $prop property for dataset " \
                "$dataset"
                return 1
        fi

        echo "$prop_val"
        return 0
}

#
# Simple function to get the specified property of pool. If unable to
# get the property then exits.
#
# Note property is in 'parsable' format (-p)
#
function get_pool_prop # property pool
{
        typeset prop_val
        typeset prop=$1
        typeset pool=$2

        if poolexists $pool ; then
                prop_val=$(zpool get -pH $prop $pool 2>/dev/null | tail -1 | \
                        awk '{print $3}')
                if [[ $? -ne 0 ]]; then
                        log_note "Unable to get $prop property for pool " \
                        "$pool"
                        return 1
                fi
        else
                log_note "Pool $pool not exists."
                return 1
        fi

        echo "$prop_val"
        return 0
}

# Return 0 if a pool exists; $? otherwise
#
# $1 - pool name

function poolexists
{
        typeset pool=$1

        if [[ -z $pool ]]; then
                log_note "No pool name given."
                return 1
        fi

        zpool get name "$pool" > /dev/null 2>&1
        return $?
}

# Return 0 if all the specified datasets exist; $? otherwise
#
# $1-n  dataset name
function datasetexists
{
        if (($# == 0)); then
                log_note "No dataset name given."
                return 1
        fi

        while (($# > 0)); do
                zfs get name $1 > /dev/null 2>&1 || \
                        return $?
                shift
        done

        return 0
}

# return 0 if none of the specified datasets exists, otherwise return 1.
#
# $1-n  dataset name
function datasetnonexists
{
        if (($# == 0)); then
                log_note "No dataset name given."
                return 1
        fi

        while (($# > 0)); do
                zfs list -H -t filesystem,snapshot,volume $1 > /dev/null 2>&1 \
                    && return 1
                shift
        done

        return 0
}

function is_shared_impl
{
        typeset fs=$1
        typeset mtpt

        if is_linux; then
                for mtpt in `share | awk '{print $1}'` ; do
                        if [[ $mtpt == $fs ]] ; then
                                return 0
                        fi
                done
                return 1
        fi

        for mtpt in `share | awk '{print $2}'` ; do
                if [[ $mtpt == $fs ]] ; then
                        return 0
                fi
        done

        typeset stat=$(svcs -H -o STA nfs/server:default)
        if [[ $stat != "ON" ]]; then
                log_note "Current nfs/server status: $stat"
        fi

        return 1
}

#
# Given a mountpoint, or a dataset name, determine if it is shared via NFS.
#
# Returns 0 if shared, 1 otherwise.
#
function is_shared
{
        typeset fs=$1
        typeset mtpt

        if [[ $fs != "/"* ]] ; then
                if datasetnonexists "$fs" ; then
                        return 1
                else
                        mtpt=$(get_prop mountpoint "$fs")
                        case $mtpt in
                                none|legacy|-) return 1
                                        ;;
                                *)      fs=$mtpt
                                        ;;
                        esac
                fi
        fi

        is_shared_impl "$fs"
}

#
# Given a dataset name determine if it is shared via SMB.
#
# Returns 0 if shared, 1 otherwise.
#
function is_shared_smb
{
        typeset fs=$1
        typeset mtpt

        if datasetnonexists "$fs" ; then
                return 1
        else
                fs=$(echo $fs | sed 's@/@_@g')
        fi

        if is_linux; then
                for mtpt in `net usershare list | awk '{print $1}'` ; do
                        if [[ $mtpt == $fs ]] ; then
                                return 0
                        fi
                done
                return 1
        else
                log_unsupported "Currently unsupported by the test framework"
                return 1
        fi
}

#
# Given a mountpoint, determine if it is not shared via NFS.
#
# Returns 0 if not shared, 1 otherwise.
#
function not_shared
{
        typeset fs=$1

        is_shared $fs
        if (($? == 0)); then
                return 1
        fi

        return 0
}

#
# Given a dataset determine if it is not shared via SMB.
#
# Returns 0 if not shared, 1 otherwise.
#
function not_shared_smb
{
        typeset fs=$1

        is_shared_smb $fs
        if (($? == 0)); then
                return 1
        fi

        return 0
}

#
# Helper function to unshare a mountpoint.
#
function unshare_fs #fs
{
        typeset fs=$1

        is_shared $fs || is_shared_smb $fs
        if (($? == 0)); then
                log_must zfs unshare $fs
        fi

        return 0
}

#
# Helper function to share a NFS mountpoint.
#
function share_nfs #fs
{
        typeset fs=$1

        if is_linux; then
                is_shared $fs
                if (($? != 0)); then
                        log_must share "*:$fs"
                fi
        else
                is_shared $fs
                if (($? != 0)); then
                        log_must share -F nfs $fs
                fi
        fi

        return 0
}

#
# Helper function to unshare a NFS mountpoint.
#
function unshare_nfs #fs
{
        typeset fs=$1

        if is_linux; then
                is_shared $fs
                if (($? == 0)); then
                        log_must unshare -u "*:$fs"
                fi
        else
                is_shared $fs
                if (($? == 0)); then
                        log_must unshare -F nfs $fs
                fi
        fi

        return 0
}

#
# Helper function to show NFS shares.
#
function showshares_nfs
{
        if is_linux; then
                share -v
        else
                share -F nfs
        fi

        return 0
}

#
# Helper function to show SMB shares.
#
function showshares_smb
{
        if is_linux; then
                net usershare list
        else
                share -F smb
        fi

        return 0
}

#
# Check NFS server status and trigger it online.
#
function setup_nfs_server
{
        # Cannot share directory in non-global zone.
        #
        if ! is_global_zone; then
                log_note "Cannot trigger NFS server by sharing in LZ."
                return
        fi

        if is_linux; then
                #
                # Re-synchronize /var/lib/nfs/etab with /etc/exports and
                # /etc/exports.d./* to provide a clean test environment.
                #
                log_must share -r

                log_note "NFS server must be started prior to running ZTS."
                return
        fi

        typeset nfs_fmri="svc:/network/nfs/server:default"
        if [[ $(svcs -Ho STA $nfs_fmri) != "ON" ]]; then
                #
                # Only really sharing operation can enable NFS server
                # to online permanently.
                #
                typeset dummy=/tmp/dummy

                if [[ -d $dummy ]]; then
                        log_must rm -rf $dummy
                fi

                log_must mkdir $dummy
                log_must share $dummy

                #
                # Waiting for fmri's status to be the final status.
                # Otherwise, in transition, an asterisk (*) is appended for
                # instances, unshare will reverse status to 'DIS' again.
                #
                # Waiting for 1's at least.
                #
                log_must sleep 1
                timeout=10
                while [[ timeout -ne 0 && $(svcs -Ho STA $nfs_fmri) == *'*' ]]
                do
                        log_must sleep 1

                        ((timeout -= 1))
                done

                log_must unshare $dummy
                log_must rm -rf $dummy
        fi

        log_note "Current NFS status: '$(svcs -Ho STA,FMRI $nfs_fmri)'"
}

#
# To verify whether calling process is in global zone
#
# Return 0 if in global zone, 1 in non-global zone
#
function is_global_zone
{
        if is_linux; then
                return 0
        else
                typeset cur_zone=$(zonename 2>/dev/null)
                if [[ $cur_zone != "global" ]]; then
                        return 1
                fi
                return 0
        fi
}

#
# Verify whether test is permitted to run from
# global zone, local zone, or both
#
# $1 zone limit, could be "global", "local", or "both"(no limit)
#
# Return 0 if permitted, otherwise exit with log_unsupported
#
function verify_runnable # zone limit
{
        typeset limit=$1

        [[ -z $limit ]] && return 0

        if is_global_zone ; then
                case $limit in
                        global|both)
                                ;;
                        local)  log_unsupported "Test is unable to run from "\
                                        "global zone."
                                ;;
                        *)      log_note "Warning: unknown limit $limit - " \
                                        "use both."
                                ;;
                esac
        else
                case $limit in
                        local|both)
                                ;;
                        global) log_unsupported "Test is unable to run from "\
                                        "local zone."
                                ;;
                        *)      log_note "Warning: unknown limit $limit - " \
                                        "use both."
                                ;;
                esac

                reexport_pool
        fi

        return 0
}

# Return 0 if create successfully or the pool exists; $? otherwise
# Note: In local zones, this function should return 0 silently.
#
# $1 - pool name
# $2-n - [keyword] devs_list

function create_pool #pool devs_list
{
        typeset pool=${1%%/*}

        shift

        if [[ -z $pool ]]; then
                log_note "Missing pool name."
                return 1
        fi

        if poolexists $pool ; then
                destroy_pool $pool
        fi

        if is_global_zone ; then
                [[ -d /$pool ]] && rm -rf /$pool
                log_must zpool create -f $pool $@
        fi

        return 0
}

# Return 0 if destroy successfully or the pool exists; $? otherwise
# Note: In local zones, this function should return 0 silently.
#
# $1 - pool name
# Destroy pool with the given parameters.

function destroy_pool #pool
{
        typeset pool=${1%%/*}
        typeset mtpt

        if [[ -z $pool ]]; then
                log_note "No pool name given."
                return 1
        fi

        if is_global_zone ; then
                if poolexists "$pool" ; then
                        mtpt=$(get_prop mountpoint "$pool")

                        # At times, syseventd/udev activity can cause attempts
                        # to destroy a pool to fail with EBUSY. We retry a few
                        # times allowing failures before requiring the destroy
                        # to succeed.
                        log_must_busy zpool destroy -f $pool

                        [[ -d $mtpt ]] && \
                                log_must rm -rf $mtpt
                else
                        log_note "Pool does not exist. ($pool)"
                        return 1
                fi
        fi

        return 0
}

# Return 0 if created successfully; $? otherwise
#
# $1 - dataset name
# $2-n - dataset options

function create_dataset #dataset dataset_options
{
        typeset dataset=$1

        shift

        if [[ -z $dataset ]]; then
                log_note "Missing dataset name."
                return 1
        fi

        if datasetexists $dataset ; then
                destroy_dataset $dataset
        fi

        log_must zfs create $@ $dataset

        return 0
}

# Return 0 if destroy successfully or the dataset exists; $? otherwise
# Note: In local zones, this function should return 0 silently.
#
# $1 - dataset name
# $2 - custom arguments for zfs destroy
# Destroy dataset with the given parameters.

function destroy_dataset #dataset #args
{
        typeset dataset=$1
        typeset mtpt
        typeset args=${2:-""}

        if [[ -z $dataset ]]; then
                log_note "No dataset name given."
                return 1
        fi

        if is_global_zone ; then
                if datasetexists "$dataset" ; then
                        mtpt=$(get_prop mountpoint "$dataset")
                        log_must_busy zfs destroy $args $dataset

                        [[ -d $mtpt ]] && \
                                log_must rm -rf $mtpt
                else
                        log_note "Dataset does not exist. ($dataset)"
                        return 1
                fi
        fi

        return 0
}

#
# Firstly, create a pool with 5 datasets. Then, create a single zone and
# export the 5 datasets to it. In addition, we also add a ZFS filesystem
# and a zvol device to the zone.
#
# $1 zone name
# $2 zone root directory prefix
# $3 zone ip
#
function zfs_zones_setup #zone_name zone_root zone_ip
{
        typeset zone_name=${1:-$(hostname)-z}
        typeset zone_root=${2:-"/zone_root"}
        typeset zone_ip=${3:-"10.1.1.10"}
        typeset prefix_ctr=$ZONE_CTR
        typeset pool_name=$ZONE_POOL
        typeset -i cntctr=5
        typeset -i i=0

        # Create pool and 5 container within it
        #
        [[ -d /$pool_name ]] && rm -rf /$pool_name
        log_must zpool create -f $pool_name $DISKS
        while ((i < cntctr)); do
                log_must zfs create $pool_name/$prefix_ctr$i
                ((i += 1))
        done

        # create a zvol
        log_must zfs create -V 1g $pool_name/zone_zvol
        block_device_wait

        #
        # If current system support slog, add slog device for pool
        #
        if verify_slog_support ; then
                typeset sdevs="$TEST_BASE_DIR/sdev1 $TEST_BASE_DIR/sdev2"
                log_must mkfile $MINVDEVSIZE $sdevs
                log_must zpool add $pool_name log mirror $sdevs
        fi

        # this isn't supported just yet.
        # Create a filesystem. In order to add this to
        # the zone, it must have it's mountpoint set to 'legacy'
        # log_must zfs create $pool_name/zfs_filesystem
        # log_must zfs set mountpoint=legacy $pool_name/zfs_filesystem

        [[ -d $zone_root ]] && \
                log_must rm -rf $zone_root/$zone_name
        [[ ! -d $zone_root ]] && \
                log_must mkdir -p -m 0700 $zone_root/$zone_name

        # Create zone configure file and configure the zone
        #
        typeset zone_conf=/tmp/zone_conf.$$
        echo "create" > $zone_conf
        echo "set zonepath=$zone_root/$zone_name" >> $zone_conf
        echo "set autoboot=true" >> $zone_conf
        i=0
        while ((i < cntctr)); do
                echo "add dataset" >> $zone_conf
                echo "set name=$pool_name/$prefix_ctr$i" >> \
                        $zone_conf
                echo "end" >> $zone_conf
                ((i += 1))
        done

        # add our zvol to the zone
        echo "add device" >> $zone_conf
        echo "set match=/dev/zvol/dsk/$pool_name/zone_zvol" >> $zone_conf
        echo "end" >> $zone_conf

        # add a corresponding zvol rdsk to the zone
        echo "add device" >> $zone_conf
        echo "set match=$ZVOL_RDEVDIR/$pool_name/zone_zvol" >> $zone_conf
        echo "end" >> $zone_conf

        # once it's supported, we'll add our filesystem to the zone
        # echo "add fs" >> $zone_conf
        # echo "set type=zfs" >> $zone_conf
        # echo "set special=$pool_name/zfs_filesystem" >> $zone_conf
        # echo "set dir=/export/zfs_filesystem" >> $zone_conf
        # echo "end" >> $zone_conf

        echo "verify" >> $zone_conf
        echo "commit" >> $zone_conf
        log_must zonecfg -z $zone_name -f $zone_conf
        log_must rm -f $zone_conf

        # Install the zone
        zoneadm -z $zone_name install
        if (($? == 0)); then
                log_note "SUCCESS: zoneadm -z $zone_name install"
        else
                log_fail "FAIL: zoneadm -z $zone_name install"
        fi

        # Install sysidcfg file
        #
        typeset sysidcfg=$zone_root/$zone_name/root/etc/sysidcfg
        echo "system_locale=C" > $sysidcfg
        echo  "terminal=dtterm" >> $sysidcfg
        echo  "network_interface=primary {" >> $sysidcfg
        echo  "hostname=$zone_name" >> $sysidcfg
        echo  "}" >> $sysidcfg
        echo  "name_service=NONE" >> $sysidcfg
        echo  "root_password=mo791xfZ/SFiw" >> $sysidcfg
        echo  "security_policy=NONE" >> $sysidcfg
        echo  "timezone=US/Eastern" >> $sysidcfg

        # Boot this zone
        log_must zoneadm -z $zone_name boot
}

#
# Reexport TESTPOOL & TESTPOOL(1-4)
#
function reexport_pool
{
        typeset -i cntctr=5
        typeset -i i=0

        while ((i < cntctr)); do
                if ((i == 0)); then
                        TESTPOOL=$ZONE_POOL/$ZONE_CTR$i
                        if ! ismounted $TESTPOOL; then
                                log_must zfs mount $TESTPOOL
                        fi
                else
                        eval TESTPOOL$i=$ZONE_POOL/$ZONE_CTR$i
                        if eval ! ismounted \$TESTPOOL$i; then
                                log_must eval zfs mount \$TESTPOOL$i
                        fi
                fi
                ((i += 1))
        done
}

#
# Verify a given disk or pool state
#
# Return 0 is pool/disk matches expected state, 1 otherwise
#
function check_state # pool disk state{online,offline,degraded}
{
        typeset pool=$1
        typeset disk=${2#$DEV_DSKDIR/}
        typeset state=$3

        [[ -z $pool ]] || [[ -z $state ]] \
            && log_fail "Arguments invalid or missing"

        if [[ -z $disk ]]; then
                #check pool state only
                zpool get -H -o value health $pool \
                    | grep -i "$state" > /dev/null 2>&1
        else
                zpool status -v $pool | grep "$disk"  \
                    | grep -i "$state" > /dev/null 2>&1
        fi

        return $?
}

#
# Get the mountpoint of snapshot
# For the snapshot use <mp_filesystem>/.zfs/snapshot/<snap>
# as its mountpoint
#
function snapshot_mountpoint
{
        typeset dataset=${1:-$TESTPOOL/$TESTFS@$TESTSNAP}

        if [[ $dataset != *@* ]]; then
                log_fail "Error name of snapshot '$dataset'."
        fi

        typeset fs=${dataset%@*}
        typeset snap=${dataset#*@}

        if [[ -z $fs || -z $snap ]]; then
                log_fail "Error name of snapshot '$dataset'."
        fi

        echo $(get_prop mountpoint $fs)/.zfs/snapshot/$snap
}

#
# Given a device and 'ashift' value verify it's correctly set on every label
#
function verify_ashift # device ashift
{
        typeset device="$1"
        typeset ashift="$2"

        zdb -e -lll $device | awk -v ashift=$ashift '/ashift: / {
            if (ashift != $2)
                exit 1;
            else
                count++;
            } END {
            if (count != 4)
                exit 1;
            else
                exit 0;
            }'

        return $?
}

#
# Given a pool and file system, this function will verify the file system
# using the zdb internal tool. Note that the pool is exported and imported
# to ensure it has consistent state.
#
function verify_filesys # pool filesystem dir
{
        typeset pool="$1"
        typeset filesys="$2"
        typeset zdbout="/tmp/zdbout.$$"

        shift
        shift
        typeset dirs=$@
        typeset search_path=""

        log_note "Calling zdb to verify filesystem '$filesys'"
        zfs unmount -a > /dev/null 2>&1
        log_must zpool export $pool

        if [[ -n $dirs ]] ; then
                for dir in $dirs ; do
                        search_path="$search_path -d $dir"
                done
        fi

        log_must zpool import $search_path $pool

        zdb -cudi $filesys > $zdbout 2>&1
        if [[ $? != 0 ]]; then
                log_note "Output: zdb -cudi $filesys"
                cat $zdbout
                log_fail "zdb detected errors with: '$filesys'"
        fi

        log_must zfs mount -a
        log_must rm -rf $zdbout
}

#
# Given a pool issue a scrub and verify that no checksum errors are reported.
#
function verify_pool
{
        typeset pool=${1:-$TESTPOOL}

        log_must zpool scrub $pool
        log_must wait_scrubbed $pool

        cksum=$(zpool status $pool | awk 'L{print $NF;L=0} /CKSUM$/{L=1}')
        if [[ $cksum != 0 ]]; then
                log_must zpool status -v
                log_fail "Unexpected CKSUM errors found on $pool ($cksum)"
        fi
}

#
# Given a pool, and this function list all disks in the pool
#
function get_disklist # pool
{
        typeset disklist=""

        disklist=$(zpool iostat -v $1 | nawk '(NR >4) {print $1}' | \
            grep -v "\-\-\-\-\-" | \
            egrep -v -e "^(mirror|raidz[1-3]|spare|log|cache|special|dedup)$")

        echo $disklist
}

#
# Given a pool, and this function list all disks in the pool with their full
# path (like "/dev/sda" instead of "sda").
#
function get_disklist_fullpath # pool
{
        args="-P $1"
        get_disklist $args
}



# /**
#  This function kills a given list of processes after a time period. We use
#  this in the stress tests instead of STF_TIMEOUT so that we can have processes
#  run for a fixed amount of time, yet still pass. Tests that hit STF_TIMEOUT
#  would be listed as FAIL, which we don't want : we're happy with stress tests
#  running for a certain amount of time, then finishing.
#
# @param $1 the time in seconds after which we should terminate these processes
# @param $2..$n the processes we wish to terminate.
# */
function stress_timeout
{
        typeset -i TIMEOUT=$1
        shift
        typeset cpids="$@"

        log_note "Waiting for child processes($cpids). " \
                "It could last dozens of minutes, please be patient ..."
        log_must sleep $TIMEOUT

        log_note "Killing child processes after ${TIMEOUT} stress timeout."
        typeset pid
        for pid in $cpids; do
                ps -p $pid > /dev/null 2>&1
                if (($? == 0)); then
                        log_must kill -USR1 $pid
                fi
        done
}

#
# Verify a given hotspare disk is inuse or avail
#
# Return 0 is pool/disk matches expected state, 1 otherwise
#
function check_hotspare_state # pool disk state{inuse,avail}
{
        typeset pool=$1
        typeset disk=${2#$DEV_DSKDIR/}
        typeset state=$3

        cur_state=$(get_device_state $pool $disk "spares")

        if [[ $state != ${cur_state} ]]; then
                return 1
        fi
        return 0
}

#
# Wait until a hotspare transitions to a given state or times out.
#
# Return 0 when  pool/disk matches expected state, 1 on timeout.
#
function wait_hotspare_state # pool disk state timeout
{
        typeset pool=$1
        typeset disk=${2#*$DEV_DSKDIR/}
        typeset state=$3
        typeset timeout=${4:-60}
        typeset -i i=0

        while [[ $i -lt $timeout ]]; do
                if check_hotspare_state $pool $disk $state; then
                        return 0
                fi

                i=$((i+1))
                sleep 1
        done

        return 1
}

#
# Verify a given slog disk is inuse or avail
#
# Return 0 is pool/disk matches expected state, 1 otherwise
#
function check_slog_state # pool disk state{online,offline,unavail}
{
        typeset pool=$1
        typeset disk=${2#$DEV_DSKDIR/}
        typeset state=$3

        cur_state=$(get_device_state $pool $disk "logs")

        if [[ $state != ${cur_state} ]]; then
                return 1
        fi
        return 0
}

#
# Verify a given vdev disk is inuse or avail
#
# Return 0 is pool/disk matches expected state, 1 otherwise
#
function check_vdev_state # pool disk state{online,offline,unavail}
{
        typeset pool=$1
        typeset disk=${2#*$DEV_DSKDIR/}
        typeset state=$3

        cur_state=$(get_device_state $pool $disk)

        if [[ $state != ${cur_state} ]]; then
                return 1
        fi
        return 0
}

#
# Wait until a vdev transitions to a given state or times out.
#
# Return 0 when  pool/disk matches expected state, 1 on timeout.
#
function wait_vdev_state # pool disk state timeout
{
        typeset pool=$1
        typeset disk=${2#*$DEV_DSKDIR/}
        typeset state=$3
        typeset timeout=${4:-60}
        typeset -i i=0

        while [[ $i -lt $timeout ]]; do
                if check_vdev_state $pool $disk $state; then
                        return 0
                fi

                i=$((i+1))
                sleep 1
        done

        return 1
}

#
# Check the output of 'zpool status -v <pool>',
# and to see if the content of <token> contain the <keyword> specified.
#
# Return 0 is contain, 1 otherwise
#
function check_pool_status # pool token keyword <verbose>
{
        typeset pool=$1
        typeset token=$2
        typeset keyword=$3
        typeset verbose=${4:-false}

        scan=$(zpool status -v "$pool" 2>/dev/null | nawk -v token="$token:" '
                ($1==token) {print $0}')
        if [[ $verbose == true ]]; then
                log_note $scan
        fi
        echo $scan | grep -i "$keyword" > /dev/null 2>&1

        return $?
}

#
# These 6 following functions are instance of check_pool_status()
#       is_pool_resilvering - to check if the pool is resilver in progress
#       is_pool_resilvered - to check if the pool is resilver completed
#       is_pool_scrubbing - to check if the pool is scrub in progress
#       is_pool_scrubbed - to check if the pool is scrub completed
#       is_pool_scrub_stopped - to check if the pool is scrub stopped
#       is_pool_scrub_paused - to check if the pool has scrub paused
#       is_pool_removing - to check if the pool is removing a vdev
#       is_pool_removed - to check if the pool is remove completed
#
function is_pool_resilvering #pool <verbose>
{
        check_pool_status "$1" "scan" "resilver in progress since " $2
        return $?
}

function is_pool_resilvered #pool <verbose>
{
        check_pool_status "$1" "scan" "resilvered " $2
        return $?
}

function is_pool_scrubbing #pool <verbose>
{
        check_pool_status "$1" "scan" "scrub in progress since " $2
        return $?
}

function is_pool_scrubbed #pool <verbose>
{
        check_pool_status "$1" "scan" "scrub repaired" $2
        return $?
}

function is_pool_scrub_stopped #pool <verbose>
{
        check_pool_status "$1" "scan" "scrub canceled" $2
        return $?
}

function is_pool_scrub_paused #pool <verbose>
{
        check_pool_status "$1" "scan" "scrub paused since " $2
        return $?
}

function is_pool_removing #pool
{
        check_pool_status "$1" "remove" "in progress since "
        return $?
}

function is_pool_removed #pool
{
        check_pool_status "$1" "remove" "completed on"
        return $?
}

function wait_for_degraded
{
        typeset pool=$1
        typeset timeout=${2:-30}
        typeset t0=$SECONDS

        while :; do
                [[ $(get_pool_prop health $pool) == "DEGRADED" ]] && break
                log_note "$pool is not yet degraded."
                sleep 1
                if ((SECONDS - t0 > $timeout)); then
                        log_note "$pool not degraded after $timeout seconds."
                        return 1
                fi
        done

        return 0
}

#
# Use create_pool()/destroy_pool() to clean up the information in
# in the given disk to avoid slice overlapping.
#
function cleanup_devices #vdevs
{
        typeset pool="foopool$$"

        if poolexists $pool ; then
                destroy_pool $pool
        fi

        create_pool $pool $@
        destroy_pool $pool

        return 0
}

#/**
# A function to find and locate free disks on a system or from given
# disks as the parameter. It works by locating disks that are in use
# as swap devices and dump devices, and also disks listed in /etc/vfstab
#
# $@ given disks to find which are free, default is all disks in
# the test system
#
# @return a string containing the list of available disks
#*/
function find_disks
{
        # Trust provided list, no attempt is made to locate unused devices.
        if is_linux; then
                echo "$@"
                return
        fi


        sfi=/tmp/swaplist.$$
        dmpi=/tmp/dumpdev.$$
        max_finddisksnum=${MAX_FINDDISKSNUM:-6}

        swap -l > $sfi
        dumpadm > $dmpi 2>/dev/null

# write an awk script that can process the output of format
# to produce a list of disks we know about. Note that we have
# to escape "$2" so that the shell doesn't interpret it while
# we're creating the awk script.
# -------------------
        cat > /tmp/find_disks.awk <<EOF
#!/bin/nawk -f
        BEGIN { FS="."; }

        /^Specify disk/{
                searchdisks=0;
        }

        {
                if (searchdisks && \$2 !~ "^$"){
                        split(\$2,arr," ");
                        print arr[1];
                }
        }

        /^AVAILABLE DISK SELECTIONS:/{
                searchdisks=1;
        }
EOF
#---------------------

        chmod 755 /tmp/find_disks.awk
        disks=${@:-$(echo "" | format -e 2>/dev/null | /tmp/find_disks.awk)}
        rm /tmp/find_disks.awk

        unused=""
        for disk in $disks; do
        # Check for mounted
                grep "${disk}[sp]" /etc/mnttab >/dev/null
                (($? == 0)) && continue
        # Check for swap
                grep "${disk}[sp]" $sfi >/dev/null
                (($? == 0)) && continue
        # check for dump device
                grep "${disk}[sp]" $dmpi >/dev/null
                (($? == 0)) && continue
        # check to see if this disk hasn't been explicitly excluded
        # by a user-set environment variable
                echo "${ZFS_HOST_DEVICES_IGNORE}" | grep "${disk}" > /dev/null
                (($? == 0)) && continue
                unused_candidates="$unused_candidates $disk"
        done
        rm $sfi
        rm $dmpi

# now just check to see if those disks do actually exist
# by looking for a device pointing to the first slice in
# each case. limit the number to max_finddisksnum
        count=0
        for disk in $unused_candidates; do
                if [ -b $DEV_DSKDIR/${disk}s0 ]; then
                if [ $count -lt $max_finddisksnum ]; then
                        unused="$unused $disk"
                        # do not impose limit if $@ is provided
                        [[ -z $@ ]] && ((count = count + 1))
                fi
                fi
        done

# finally, return our disk list
        echo $unused
}

#
# Add specified user to specified group
#
# $1 group name
# $2 user name
# $3 base of the homedir (optional)
#
function add_user #<group_name> <user_name> <basedir>
{
        typeset gname=$1
        typeset uname=$2
        typeset basedir=${3:-"/var/tmp"}

        if ((${#gname} == 0 || ${#uname} == 0)); then
                log_fail "group name or user name are not defined."
        fi

        log_must useradd -g $gname -d $basedir/$uname -m $uname
        echo "export PATH=\"$STF_PATH\"" >>$basedir/$uname/.profile
        echo "export PATH=\"$STF_PATH\"" >>$basedir/$uname/.bash_profile
        echo "export PATH=\"$STF_PATH\"" >>$basedir/$uname/.login

        # Add new users to the same group and the command line utils.
        # This allows them to be run out of the original users home
        # directory as long as it permissioned to be group readable.
        if is_linux; then
                cmd_group=$(stat --format="%G" $(which zfs))
                log_must usermod -a -G $cmd_group $uname
        fi

        return 0
}

#
# Delete the specified user.
#
# $1 login name
# $2 base of the homedir (optional)
#
function del_user #<logname> <basedir>
{
        typeset user=$1
        typeset basedir=${2:-"/var/tmp"}

        if ((${#user} == 0)); then
                log_fail "login name is necessary."
        fi

        if id $user > /dev/null 2>&1; then
                log_must_retry "currently used" 5 userdel $user
        fi

        [[ -d $basedir/$user ]] && rm -fr $basedir/$user

        return 0
}

#
# Select valid gid and create specified group.
#
# $1 group name
#
function add_group #<group_name>
{
        typeset group=$1

        if ((${#group} == 0)); then
                log_fail "group name is necessary."
        fi

        # Assign 100 as the base gid, a larger value is selected for
        # Linux because for many distributions 1000 and under are reserved.
        if is_linux; then
                while true; do
                        groupadd $group > /dev/null 2>&1
                        typeset -i ret=$?
                        case $ret in
                                0) return 0 ;;
                                *) return 1 ;;
                        esac
                done
        else
                typeset -i gid=100
                while true; do
                        groupadd -g $gid $group > /dev/null 2>&1
                        typeset -i ret=$?
                        case $ret in
                                0) return 0 ;;
                                # The gid is not  unique
                                4) ((gid += 1)) ;;
                                *) return 1 ;;
                        esac
                done
        fi
}

#
# Delete the specified group.
#
# $1 group name
#
function del_group #<group_name>
{
        typeset grp=$1
        if ((${#grp} == 0)); then
                log_fail "group name is necessary."
        fi

        if is_linux; then
                getent group $grp > /dev/null 2>&1
                typeset -i ret=$?
                case $ret in
                        # Group does not exist.
                        2) return 0 ;;
                        # Name already exists as a group name
                        0) log_must groupdel $grp ;;
                        *) return 1 ;;
                esac
        else
                groupmod -n $grp $grp > /dev/null 2>&1
                typeset -i ret=$?
                case $ret in
                        # Group does not exist.
                        6) return 0 ;;
                        # Name already exists as a group name
                        9) log_must groupdel $grp ;;
                        *) return 1 ;;
                esac
        fi

        return 0
}

#
# This function will return true if it's safe to destroy the pool passed
# as argument 1. It checks for pools based on zvols and files, and also
# files contained in a pool that may have a different mountpoint.
#
function safe_to_destroy_pool { # $1 the pool name

        typeset pool=""
        typeset DONT_DESTROY=""

        # We check that by deleting the $1 pool, we're not
        # going to pull the rug out from other pools. Do this
        # by looking at all other pools, ensuring that they
        # aren't built from files or zvols contained in this pool.

        for pool in $(zpool list -H -o name)
        do
                ALTMOUNTPOOL=""

                # this is a list of the top-level directories in each of the
                # files that make up the path to the files the pool is based on
                FILEPOOL=$(zpool status -v $pool | grep /$1/ | \
                        awk '{print $1}')

                # this is a list of the zvols that make up the pool
                ZVOLPOOL=$(zpool status -v $pool | grep "$ZVOL_DEVDIR/$1$" \
                    | awk '{print $1}')

                # also want to determine if it's a file-based pool using an
                # alternate mountpoint...
                POOL_FILE_DIRS=$(zpool status -v $pool | \
                                        grep / | awk '{print $1}' | \
                                        awk -F/ '{print $2}' | grep -v "dev")

                for pooldir in $POOL_FILE_DIRS
                do
                        OUTPUT=$(zfs list -H -r -o mountpoint $1 | \
                                        grep "${pooldir}$" | awk '{print $1}')

                        ALTMOUNTPOOL="${ALTMOUNTPOOL}${OUTPUT}"
                done


                if [ ! -z "$ZVOLPOOL" ]
                then
                        DONT_DESTROY="true"
                        log_note "Pool $pool is built from $ZVOLPOOL on $1"
                fi

                if [ ! -z "$FILEPOOL" ]
                then
                        DONT_DESTROY="true"
                        log_note "Pool $pool is built from $FILEPOOL on $1"
                fi

                if [ ! -z "$ALTMOUNTPOOL" ]
                then
                        DONT_DESTROY="true"
                        log_note "Pool $pool is built from $ALTMOUNTPOOL on $1"
                fi
        done

        if [ -z "${DONT_DESTROY}" ]
        then
                return 0
        else
                log_note "Warning: it is not safe to destroy $1!"
                return 1
        fi
}

#
# Get the available ZFS compression options
# $1 option type zfs_set|zfs_compress
#
function get_compress_opts
{
        typeset COMPRESS_OPTS
        typeset GZIP_OPTS="gzip gzip-1 gzip-2 gzip-3 gzip-4 gzip-5 \
                        gzip-6 gzip-7 gzip-8 gzip-9"

        if [[ $1 == "zfs_compress" ]] ; then
                COMPRESS_OPTS="on lzjb"
        elif [[ $1 == "zfs_set" ]] ; then
                COMPRESS_OPTS="on off lzjb"
        fi
        typeset valid_opts="$COMPRESS_OPTS"
        zfs get 2>&1 | grep gzip >/dev/null 2>&1
        if [[ $? -eq 0 ]]; then
                valid_opts="$valid_opts $GZIP_OPTS"
        fi
        echo "$valid_opts"
}

#
# Verify zfs operation with -p option work as expected
# $1 operation, value could be create, clone or rename
# $2 dataset type, value could be fs or vol
# $3 dataset name
# $4 new dataset name
#
function verify_opt_p_ops
{
        typeset ops=$1
        typeset datatype=$2
        typeset dataset=$3
        typeset newdataset=$4

        if [[ $datatype != "fs" && $datatype != "vol" ]]; then
                log_fail "$datatype is not supported."
        fi

        # check parameters accordingly
        case $ops in
                create)
                        newdataset=$dataset
                        dataset=""
                        if [[ $datatype == "vol" ]]; then
                                ops="create -V $VOLSIZE"
                        fi
                        ;;
                clone)
                        if [[ -z $newdataset ]]; then
                                log_fail "newdataset should not be empty" \
                                        "when ops is $ops."
                        fi
                        log_must datasetexists $dataset
                        log_must snapexists $dataset
                        ;;
                rename)
                        if [[ -z $newdataset ]]; then
                                log_fail "newdataset should not be empty" \
                                        "when ops is $ops."
                        fi
                        log_must datasetexists $dataset
                        ;;
                *)
                        log_fail "$ops is not supported."
                        ;;
        esac

        # make sure the upper level filesystem does not exist
        destroy_dataset "${newdataset%/*}" "-rRf"

        # without -p option, operation will fail
        log_mustnot zfs $ops $dataset $newdataset
        log_mustnot datasetexists $newdataset ${newdataset%/*}

        # with -p option, operation should succeed
        log_must zfs $ops -p $dataset $newdataset
        block_device_wait

        if ! datasetexists $newdataset ; then
                log_fail "-p option does not work for $ops"
        fi

        # when $ops is create or clone, redo the operation still return zero
        if [[ $ops != "rename" ]]; then
                log_must zfs $ops -p $dataset $newdataset
        fi

        return 0
}

#
# Get configuration of pool
# $1 pool name
# $2 config name
#
function get_config
{
        typeset pool=$1
        typeset config=$2
        typeset alt_root

        if ! poolexists "$pool" ; then
                return 1
        fi
        alt_root=$(zpool list -H $pool | awk '{print $NF}')
        if [[ $alt_root == "-" ]]; then
                value=$(zdb -C $pool | grep "$config:" | awk -F: \
                    '{print $2}')
        else
                value=$(zdb -e $pool | grep "$config:" | awk -F: \
                    '{print $2}')
        fi
        if [[ -n $value ]] ; then
                value=${value#'}
                value=${value%'}
        fi
        echo $value

        return 0
}

#
# Privated function. Random select one of items from arguments.
#
# $1 count
# $2-n string
#
function _random_get
{
        typeset cnt=$1
        shift

        typeset str="$@"
        typeset -i ind
        ((ind = RANDOM % cnt + 1))

        typeset ret=$(echo "$str" | cut -f $ind -d ' ')
        echo $ret
}

#
# Random select one of item from arguments which include NONE string
#
function random_get_with_non
{
        typeset -i cnt=$#
        ((cnt =+ 1))

        _random_get "$cnt" "$@"
}

#
# Random select one of item from arguments which doesn't include NONE string
#
function random_get
{
        _random_get "$#" "$@"
}

#
# Detect if the current system support slog
#
function verify_slog_support
{
        typeset dir=$TEST_BASE_DIR/disk.$$
        typeset pool=foo.$$
        typeset vdev=$dir/a
        typeset sdev=$dir/b

        mkdir -p $dir
        mkfile $MINVDEVSIZE $vdev $sdev

        typeset -i ret=0
        if ! zpool create -n $pool $vdev log $sdev > /dev/null 2>&1; then
                ret=1
        fi
        rm -r $dir

        return $ret
}

#
# The function will generate a dataset name with specific length
# $1, the length of the name
# $2, the base string to construct the name
#
function gen_dataset_name
{
        typeset -i len=$1
        typeset basestr="$2"
        typeset -i baselen=${#basestr}
        typeset -i iter=0
        typeset l_name=""

        if ((len % baselen == 0)); then
                ((iter = len / baselen))
        else
                ((iter = len / baselen + 1))
        fi
        while ((iter > 0)); do
                l_name="${l_name}$basestr"

                ((iter -= 1))
        done

        echo $l_name
}

#
# Get cksum tuple of dataset
# $1 dataset name
#
# sample zdb output:
# Dataset data/test [ZPL], ID 355, cr_txg 2413856, 31.0K, 7 objects, rootbp
# DVA[0]=<0:803046400:200> DVA[1]=<0:81199000:200> [L0 DMU objset] fletcher4
# lzjb LE contiguous unique double size=800L/200P birth=2413856L/2413856P
# fill=7 cksum=11ce125712:643a9c18ee2:125e25238fca0:254a3f74b59744
function datasetcksum
{
        typeset cksum
        sync
        cksum=$(zdb -vvv $1 | grep "^Dataset $1 \[" | grep "cksum" \
                | awk -F= '{print $7}')
        echo $cksum
}

#
# Get cksum of file
# #1 file path
#
function checksum
{
        typeset cksum
        cksum=$(cksum $1 | awk '{print $1}')
        echo $cksum
}

#
# Get the given disk/slice state from the specific field of the pool
#
function get_device_state #pool disk field("", "spares","logs")
{
        typeset pool=$1
        typeset disk=${2#$DEV_DSKDIR/}
        typeset field=${3:-$pool}

        state=$(zpool status -v "$pool" 2>/dev/null | \
                nawk -v device=$disk -v pool=$pool -v field=$field \
                'BEGIN {startconfig=0; startfield=0; }
                /config:/ {startconfig=1}
                (startconfig==1) && ($1==field) {startfield=1; next;}
                (startfield==1) && ($1==device) {print $2; exit;}
                (startfield==1) &&
                ($1==field || $1 ~ "^spares$" || $1 ~ "^logs$") {startfield=0}')
        echo $state
}


#
# print the given directory filesystem type
#
# $1 directory name
#
function get_fstype
{
        typeset dir=$1

        if [[ -z $dir ]]; then
                log_fail "Usage: get_fstype <directory>"
        fi

        #
        #  $ df -n /
        #  /              : ufs
        #
        df -n $dir | awk '{print $3}'
}

#
# Given a disk, label it to VTOC regardless what label was on the disk
# $1 disk
#
function labelvtoc
{
        typeset disk=$1
        if [[ -z $disk ]]; then
                log_fail "The disk name is unspecified."
        fi
        typeset label_file=/var/tmp/labelvtoc.$$
        typeset arch=$(uname -p)

        if is_linux; then
                log_note "Currently unsupported by the test framework"
                return 1
        fi

        if [[ $arch == "i386" ]]; then
                echo "label" > $label_file
                echo "0" >> $label_file
                echo "" >> $label_file
                echo "q" >> $label_file
                echo "q" >> $label_file

                fdisk -B $disk >/dev/null 2>&1
                # wait a while for fdisk finishes
                sleep 60
        elif [[ $arch == "sparc" ]]; then
                echo "label" > $label_file
                echo "0" >> $label_file
                echo "" >> $label_file
                echo "" >> $label_file
                echo "" >> $label_file
                echo "q" >> $label_file
        else
                log_fail "unknown arch type"
        fi

        format -e -s -d $disk -f $label_file
        typeset -i ret_val=$?
        rm -f $label_file
        #
        # wait the format to finish
        #
        sleep 60
        if ((ret_val != 0)); then
                log_fail "unable to label $disk as VTOC."
        fi

        return 0
}

#
# check if the system was installed as zfsroot or not
# return: 0 ture, otherwise false
#
function is_zfsroot
{
        df -n / | grep zfs > /dev/null 2>&1
        return $?
}

#
# get the root filesystem name if it's zfsroot system.
#
# return: root filesystem name
function get_rootfs
{
        typeset rootfs=""

        if ! is_linux; then
                rootfs=$(awk '{if ($2 == "/" && $3 == "zfs") print $1}' \
                        /etc/mnttab)
        fi
        if [[ -z "$rootfs" ]]; then
                log_fail "Can not get rootfs"
        fi
        zfs list $rootfs > /dev/null 2>&1
        if (($? == 0)); then
                echo $rootfs
        else
                log_fail "This is not a zfsroot system."
        fi
}

#
# get the rootfs's pool name
# return:
#       rootpool name
#
function get_rootpool
{
        typeset rootfs=""
        typeset rootpool=""

        if ! is_linux; then
                rootfs=$(awk '{if ($2 == "/" && $3 =="zfs") print $1}' \
                         /etc/mnttab)
        fi
        if [[ -z "$rootfs" ]]; then
                log_fail "Can not get rootpool"
        fi
        zfs list $rootfs > /dev/null 2>&1
        if (($? == 0)); then
                rootpool=`echo $rootfs | awk -F\/ '{print $1}'`
                echo $rootpool
        else
                log_fail "This is not a zfsroot system."
        fi
}

#
# Get the package name
#
function get_package_name
{
        typeset dirpath=${1:-$STC_NAME}

        echo "SUNWstc-${dirpath}" | /usr/bin/sed -e "s/\//-/g"
}

#
# Get the word numbers from a string separated by white space
#
function get_word_count
{
        echo $1 | wc -w
}

#
# To verify if the require numbers of disks is given
#
function verify_disk_count
{
        typeset -i min=${2:-1}

        typeset -i count=$(get_word_count "$1")

        if ((count < min)); then
                log_untested "A minimum of $min disks is required to run." \
                        " You specified $count disk(s)"
        fi
}

function ds_is_volume
{
        typeset type=$(get_prop type $1)
        [[ $type = "volume" ]] && return 0
        return 1
}

function ds_is_filesystem
{
        typeset type=$(get_prop type $1)
        [[ $type = "filesystem" ]] && return 0
        return 1
}

function ds_is_snapshot
{
        typeset type=$(get_prop type $1)
        [[ $type = "snapshot" ]] && return 0
        return 1
}

#
# Check if Trusted Extensions are installed and enabled
#
function is_te_enabled
{
        svcs -H -o state labeld 2>/dev/null | grep "enabled"
        if (($? != 0)); then
                return 1
        else
                return 0
        fi
}

# Utility function to determine if a system has multiple cpus.
function is_mp
{
        if is_linux; then
                (($(nproc) > 1))
        else
                (($(psrinfo | wc -l) > 1))
        fi

        return $?
}

function get_cpu_freq
{
        if is_linux; then
                lscpu | awk '/CPU MHz/ { print $3 }'
        else
                psrinfo -v 0 | awk '/processor operates at/ {print $6}'
        fi
}

# Run the given command as the user provided.
function user_run
{
        typeset user=$1
        shift

        log_note "user:$user $@"
        eval su - \$user -c \"$@\" > $TEST_BASE_DIR/out 2>$TEST_BASE_DIR/err
        return $?
}

#
# Check if the pool contains the specified vdevs
#
# $1 pool
# $2..n <vdev> ...
#
# Return 0 if the vdevs are contained in the pool, 1 if any of the specified
# vdevs is not in the pool, and 2 if pool name is missing.
#
function vdevs_in_pool
{
        typeset pool=$1
        typeset vdev

        if [[ -z $pool ]]; then
                log_note "Missing pool name."
                return 2
        fi

        shift

        # We could use 'zpool list' to only get the vdevs of the pool but we
        # can't reference a mirror/raidz vdev using its ID (i.e mirror-0),
        # therefore we use the 'zpool status' output.
        typeset tmpfile=$(mktemp)
        zpool status -v "$pool" | grep -A 1000 "config:" >$tmpfile
        for vdev in $@; do
                grep -w ${vdev##*/} $tmpfile >/dev/null 2>&1
                [[ $? -ne 0 ]] && return 1
        done

        rm -f $tmpfile

        return 0;
}

function get_max
{
        typeset -l i max=$1
        shift

        for i in "$@"; do
                max=$(echo $((max > i ? max : i)))
        done

        echo $max
}

function get_min
{
        typeset -l i min=$1
        shift

        for i in "$@"; do
                min=$(echo $((min < i ? min : i)))
        done

        echo $min
}

#
# Generate a random number between 1 and the argument.
#
function random
{
        typeset max=$1
        echo $(( ($RANDOM % $max) + 1 ))
}

# Write data that can be compressed into a directory
function write_compressible
{
        typeset dir=$1
        typeset megs=$2
        typeset nfiles=${3:-1}
        typeset bs=${4:-1024k}
        typeset fname=${5:-file}

        [[ -d $dir ]] || log_fail "No directory: $dir"

        # Under Linux fio is not currently used since its behavior can
        # differ significantly across versions.  This includes missing
        # command line options and cases where the --buffer_compress_*
        # options fail to behave as expected.
        if is_linux; then
                typeset file_bytes=$(to_bytes $megs)
                typeset bs_bytes=4096
                typeset blocks=$(($file_bytes / $bs_bytes))

                for (( i = 0; i < $nfiles; i++ )); do
                        truncate -s $file_bytes $dir/$fname.$i

                        # Write every third block to get 66% compression.
                        for (( j = 0; j < $blocks; j += 3 )); do
                                dd if=/dev/urandom of=$dir/$fname.$i \
                                    seek=$j bs=$bs_bytes count=1 \
                                    conv=notrunc >/dev/null 2>&1
                        done
                done
        else
                log_must eval "fio \
                    --name=job \
                    --fallocate=0 \
                    --minimal \
                    --randrepeat=0 \
                    --buffer_compress_percentage=66 \
                    --buffer_compress_chunk=4096 \
                    --directory=$dir \
                    --numjobs=$nfiles \
                    --nrfiles=$nfiles \
                    --rw=write \
                    --bs=$bs \
                    --filesize=$megs \
                    --filename_format='$fname.\$jobnum' >/dev/null"
        fi
}

function get_objnum
{
        typeset pathname=$1
        typeset objnum

        [[ -e $pathname ]] || log_fail "No such file or directory: $pathname"
        objnum=$(stat -c %i $pathname)
        echo $objnum
}

#
# Sync data to the pool
#
# $1 pool name
# $2 boolean to force uberblock (and config including zpool cache file) update
#
function sync_pool #pool <force>
{
        typeset pool=${1:-$TESTPOOL}
        typeset force=${2:-false}

        if [[ $force == true ]]; then
                log_must zpool sync -f $pool
        else
                log_must zpool sync $pool
        fi

        return 0
}

#
# Wait for zpool 'freeing' property drops to zero.
#
# $1 pool name
#
function wait_freeing #pool
{
        typeset pool=${1:-$TESTPOOL}
        while true; do
                [[ "0" == "$(zpool list -Ho freeing $pool)" ]] && break
                log_must sleep 1
        done
}

#
# Wait for every device replace operation to complete
#
# $1 pool name
#
function wait_replacing #pool
{
        typeset pool=${1:-$TESTPOOL}
        while true; do
                [[ "" == "$(zpool status $pool |
                    awk '/replacing-[0-9]+/ {print $1}')" ]] && break
                log_must sleep 1
        done
}

#
# Wait for a pool to be scrubbed
#
# $1 pool name
# $2 number of seconds to wait (optional)
#
# Returns true when pool has been scrubbed, or false if there's a timeout or if
# no scrub was done.
#
function wait_scrubbed
{
        typeset pool=${1:-$TESTPOOL}
        while true ; do
                is_pool_scrubbed $pool && break
                log_must sleep 1
        done
}

# Backup the zed.rc in our test directory so that we can edit it for our test.
#
# Returns: Backup file name.  You will need to pass this to zed_rc_restore().
function zed_rc_backup
{
        zedrc_backup="$(mktemp)"
        cp $ZEDLET_DIR/zed.rc $zedrc_backup
        echo $zedrc_backup
}

function zed_rc_restore
{
        mv $1 $ZEDLET_DIR/zed.rc
}

#
# Setup custom environment for the ZED.
#
# $@ Optional list of zedlets to run under zed.
function zed_setup
{
        if ! is_linux; then
                return
        fi

        if [[ ! -d $ZEDLET_DIR ]]; then
                log_must mkdir $ZEDLET_DIR
        fi

        if [[ ! -e $VDEVID_CONF ]]; then
                log_must touch $VDEVID_CONF
        fi

        if [[ -e $VDEVID_CONF_ETC ]]; then
                log_fail "Must not have $VDEVID_CONF_ETC file present on system"
        fi
        EXTRA_ZEDLETS=$@

        # Create a symlink for /etc/zfs/vdev_id.conf file.
        log_must ln -s $VDEVID_CONF $VDEVID_CONF_ETC

        # Setup minimal ZED configuration.  Individual test cases should
        # add additional ZEDLETs as needed for their specific test.
        log_must cp ${ZEDLET_ETC_DIR}/zed.rc $ZEDLET_DIR
        log_must cp ${ZEDLET_ETC_DIR}/zed-functions.sh $ZEDLET_DIR

        # Scripts must only be user writable.
        if [[ -n "$EXTRA_ZEDLETS" ]] ; then
                saved_umask=$(umask)
                log_must umask 0022
                for i in $EXTRA_ZEDLETS ; do
                        log_must cp ${ZEDLET_LIBEXEC_DIR}/$i $ZEDLET_DIR
                done
                log_must umask $saved_umask
        fi

        # Customize the zed.rc file to enable the full debug log.
        log_must sed -i '/\#ZED_DEBUG_LOG=.*/d' $ZEDLET_DIR/zed.rc
        echo "ZED_DEBUG_LOG=$ZED_DEBUG_LOG" >>$ZEDLET_DIR/zed.rc

}

#
# Cleanup custom ZED environment.
#
# $@ Optional list of zedlets to remove from our test zed.d directory.
function zed_cleanup
{
        if ! is_linux; then
                return
        fi
        EXTRA_ZEDLETS=$@

        log_must rm -f ${ZEDLET_DIR}/zed.rc
        log_must rm -f ${ZEDLET_DIR}/zed-functions.sh
        log_must rm -f ${ZEDLET_DIR}/all-syslog.sh
        log_must rm -f ${ZEDLET_DIR}/all-debug.sh
        log_must rm -f ${ZEDLET_DIR}/state

        if [[ -n "$EXTRA_ZEDLETS" ]] ; then
                for i in $EXTRA_ZEDLETS ; do
                        log_must rm -f ${ZEDLET_DIR}/$i
                done
        fi
        log_must rm -f $ZED_LOG
        log_must rm -f $ZED_DEBUG_LOG
        log_must rm -f $VDEVID_CONF_ETC
        log_must rm -f $VDEVID_CONF
        rmdir $ZEDLET_DIR
}

#
# Check if ZED is currently running, if not start ZED.
#
function zed_start
{
        if ! is_linux; then
                return
        fi

        # ZEDLET_DIR=/var/tmp/zed
        if [[ ! -d $ZEDLET_DIR ]]; then
                log_must mkdir $ZEDLET_DIR
        fi

        # Verify the ZED is not already running.
        pgrep -x zed > /dev/null
        if (($? == 0)); then
                log_fail "ZED already running"
        fi

        log_note "Starting ZED"
        # run ZED in the background and redirect foreground logging
        # output to $ZED_LOG.
        log_must truncate -s 0 $ZED_DEBUG_LOG
        log_must eval "zed -vF -d $ZEDLET_DIR -p $ZEDLET_DIR/zed.pid -P $PATH" \
            "-s $ZEDLET_DIR/state 2>$ZED_LOG &"

        return 0
}

#
# Kill ZED process
#
function zed_stop
{
        if ! is_linux; then
                return
        fi

        log_note "Stopping ZED"
        if [[ -f ${ZEDLET_DIR}/zed.pid ]]; then
                zedpid=$(<${ZEDLET_DIR}/zed.pid)
                kill $zedpid
                while ps -p $zedpid > /dev/null; do
                        sleep 1
                done
                rm -f ${ZEDLET_DIR}/zed.pid
        fi
        return 0
}

#
# Drain all zevents
#
function zed_events_drain
{
        while [ $(zpool events -H | wc -l) -ne 0 ]; do
                sleep 1
                zpool events -c >/dev/null
        done
}

# Set a variable in zed.rc to something, un-commenting it in the process.
#
# $1 variable
# $2 value
function zed_rc_set
{
        var="$1"
        val="$2"
        # Remove the line
        cmd="'/$var/d'"
        eval sed -i $cmd $ZEDLET_DIR/zed.rc

        # Add it at the end
        echo "$var=$val" >> $ZEDLET_DIR/zed.rc
}


#
# Check is provided device is being active used as a swap device.
#
function is_swap_inuse
{
        typeset device=$1

        if [[ -z $device ]] ; then
                log_note "No device specified."
                return 1
        fi

        if is_linux; then
                swapon -s | grep -w $(readlink -f $device) > /dev/null 2>&1
        else
                swap -l | grep -w $device > /dev/null 2>&1
        fi

        return $?
}

#
# Setup a swap device using the provided device.
#
function swap_setup
{
        typeset swapdev=$1

        if is_linux; then
                log_must eval "mkswap $swapdev > /dev/null 2>&1"
                log_must swapon $swapdev
        else
                log_must swap -a $swapdev
        fi

        return 0
}

#
# Cleanup a swap device on the provided device.
#
function swap_cleanup
{
        typeset swapdev=$1

        if is_swap_inuse $swapdev; then
                if is_linux; then
                        log_must swapoff $swapdev
                else
                        log_must swap -d $swapdev
                fi
        fi

        return 0
}

#
# Set a global system tunable (64-bit value)
#
# $1 tunable name
# $2 tunable values
#
function set_tunable64
{
        set_tunable_impl "$1" "$2" Z
}

#
# Set a global system tunable (32-bit value)
#
# $1 tunable name
# $2 tunable values
#
function set_tunable32
{
        set_tunable_impl "$1" "$2" W
}

function set_tunable_impl
{
        typeset tunable="$1"
        typeset value="$2"
        typeset mdb_cmd="$3"
        typeset module="${4:-zfs}"

        [[ -z "$tunable" ]] && return 1
        [[ -z "$value" ]] && return 1
        [[ -z "$mdb_cmd" ]] && return 1

        case "$(uname)" in
        Linux)
                typeset zfs_tunables="/sys/module/$module/parameters"
                [[ -w "$zfs_tunables/$tunable" ]] || return 1
                echo -n "$value" > "$zfs_tunables/$tunable"
                return "$?"
                ;;
        SunOS)
                [[ "$module" -eq "zfs" ]] || return 1
                echo "${tunable}/${mdb_cmd}0t${value}" | mdb -kw
                return "$?"
                ;;
        esac
}

#
# Get a global system tunable
#
# $1 tunable name
#
function get_tunable
{
        get_tunable_impl "$1"
}

function get_tunable_impl
{
        typeset tunable="$1"
        typeset module="${2:-zfs}"

        [[ -z "$tunable" ]] && return 1

        case "$(uname)" in
        Linux)
                typeset zfs_tunables="/sys/module/$module/parameters"
                [[ -f "$zfs_tunables/$tunable" ]] || return 1
                cat $zfs_tunables/$tunable
                return "$?"
                ;;
        SunOS)
                [[ "$module" -eq "zfs" ]] || return 1
                ;;
        esac

        return 1
}

#
# Prints the current time in seconds since UNIX Epoch.
#
function current_epoch
{
        printf '%(%s)T'
}

#
# Get decimal value of global uint32_t variable using mdb.
#
function mdb_get_uint32
{
        typeset variable=$1
        typeset value

        value=$(mdb -k -e "$variable/X | ::eval .=U")
        if [[ $? -ne 0 ]]; then
                log_fail "Failed to get value of '$variable' from mdb."
                return 1
        fi

        echo $value
        return 0
}

#
# Set global uint32_t variable to a decimal value using mdb.
#
function mdb_set_uint32
{
        typeset variable=$1
        typeset value=$2

        mdb -kw -e "$variable/W 0t$value" > /dev/null
        if [[ $? -ne 0 ]]; then
                echo "Failed to set '$variable' to '$value' in mdb."
                return 1
        fi

        return 0
}

#
# Set global scalar integer variable to a hex value using mdb.
# Note: Target should have CTF data loaded.
#
function mdb_ctf_set_int
{
        typeset variable=$1
        typeset value=$2

        mdb -kw -e "$variable/z $value" > /dev/null
        if [[ $? -ne 0 ]]; then
                echo "Failed to set '$variable' to '$value' in mdb."
                return 1
        fi

        return 0
}