functional/refreserv/refreserv_002_pos.ksh

#!/bin/ksh -p
#
# 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.
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# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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#
# Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
# Use is subject to license terms.
#

#
# Copyright (c) 2013, 2016 by Delphix. All rights reserved.
#

. $STF_SUITE/include/libtest.shlib
. $STF_SUITE/tests/functional/refreserv/refreserv.cfg

#
# DESCRIPTION:
#   Setting full size as refreservation, verify no snapshot can be created.
#
# STRATEGY:
#   1. Setting full size as refreservation on pool
#   2. Verify no snapshot can be created on this pool
#   3. Setting full size as refreservation on filesystem
#   4. Verify no snapshot can be created on it and its subfs
#

verify_runnable "both"

function cleanup
{
    if is_global_zone ; then
        log_must zfs set refreservation=none $TESTPOOL

        if datasetexists $TESTPOOL@snap ; then
            log_must zfs destroy -f $TESTPOOL@snap
        fi
    fi
    log_must zfs destroy -rf $TESTPOOL/$TESTFS
    log_must zfs create $TESTPOOL/$TESTFS
    log_must zfs set mountpoint=$TESTDIR $TESTPOOL/$TESTFS
}

# This function iteratively increases refreserv to its highest possible
# value. Simply setting refreserv == quota can allow enough writes to
# complete that the test fails.
function max_refreserv
{
    typeset ds=$1
    typeset -i incsize=131072
    typeset -i rr=$(get_prop available $ds)

    log_must zfs set refreserv=$rr $ds
    while :; do
        zfs set refreserv=$((rr + incsize)) $ds >/dev/null 2>&1
        if [[ $? == 0 ]]; then
            ((rr += incsize))
            continue
        else
            ((incsize /= 2))
            ((incsize == 0)) && break
        fi
    done
}


log_assert "Setting full size as refreservation, verify no snapshot " \
    "can be created."
log_onexit cleanup

log_must zfs create $TESTPOOL/$TESTFS/subfs

typeset datasets
if is_global_zone; then
    datasets="$TESTPOOL $TESTPOOL/$TESTFS $TESTPOOL/$TESTFS/subfs"
else
    datasets="$TESTPOOL/$TESTFS $TESTPOOL/$TESTFS/subfs"
fi

for ds in $datasets; do
    #
    # Verify refreservation on dataset
    #
    log_must zfs set quota=25M $ds
    max_refreserv $ds
    log_mustnot zfs snapshot $ds@snap
    if datasetexists $ds@snap ; then
        log_fail "ERROR: $ds@snap should not exists."
    fi

    log_must zfs set quota=none $ds
    log_must zfs set refreservation=none $ds
done

log_pass "Setting full size as refreservation, verify no snapshot " \
    "can be created."