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#!/usr/bin/ksh
#
# This file and its contents are supplied under the terms of the
# Common Development and Distribution License ("CDDL"), version 1.0.
# You may only use this file in accordance with the terms of version
# 1.0 of the CDDL.
#
# A full copy of the text of the CDDL should have accompanied this
# source. A copy of the CDDL is also available via the Internet at
# http://www.illumos.org/license/CDDL.
#
#
# Copyright 2016 Joyent, Inc.
#
#
# Verify that if we fill up a tmpfs that we can't then perform
# additional things to it that would result in the creation or use of
# kernel memory.
#
te_arg0=$(basename $0)
te_root=$(dirname $0)
te_bin=$te_root/tmpfs_full
te_mountpoint="/var/tmp/$0.$$"
te_mount=/usr/sbin/mount
te_umount=/usr/sbin/umount
te_testfile=1m
te_mounted=
te_exit=1
function fatal
{
[[ -n "$te_mounted" ]] && $te_umount $te_mountpoint
rmdir $te_mountpoint
typeset msg="$*"
[[ -z "$msg" ]] && msg="test failed"
echo "$te_arg0: test failed $msg" >&2
exit 1
}
function setup
{
typeset ofile=$te_mountpoint/$te_testfile
mkdir -p $te_mountpoint || fatal \
"failed to make mountpoint $te_mountpoint"
$te_mount -F tmpfs swap $te_mountpoint || fatal \
"failed to mount tmpfs, check user perms"
te_mounted=1
dd if=/dev/zero of=$ofile bs=1M count=1 2>/dev/null || fatal \
"failed to create a 1 MB file"
$te_mount -F tmpfs -o remount,size=512k swap $te_mountpoint ||
fatal "failed to remount tmpfs"
}
function run_test
{
$te_bin $te_mountpoint $te_testfile || fatal "$te_bin failed"
}
function cleanup
{
te_mounted=
$te_umount $te_mountpoint || fatal "failed to unmount $te_mountpoint"
rmdir $te_mountpoint || fatal "failed to remove $te_mountpoint"
}
setup
run_test
cleanup
exit 0
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