tests/generic/306

#! /bin/bash
# FS QA Test No. 306
#
# Test RW open of a device on a RO fs
#
#-----------------------------------------------------------------------
# Copyright (c) 2013 Red Hat, Inc.  All Rights Reserved.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it would be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write the Free Software Foundation,
# Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
#-----------------------------------------------------------------------
#

seq=`basename $0`
seqres=$RESULT_DIR/$seq
echo "QA output created by $seq"

here=`pwd`
tmp=/tmp/$$
status=1	# failure is the default!
trap "_cleanup; exit \$status" 0 1 2 3 15

_cleanup()
{
    umount $BINDFILE
    cd /
    rm -f $tmp.*
}

# get standard environment, filters and checks
. ./common/rc
. ./common/filter

# real QA test starts here

# Modify as appropriate.
_supported_fs generic
_supported_os Linux
_require_scratch
_require_test

DEVNULL=$SCRATCH_MNT/devnull
DEVZERO=$SCRATCH_MNT/devzero
SYMLINK=$SCRATCH_MNT/symlink
BINDFILE=$SCRATCH_MNT/bindfile
TARGET=$TEST_DIR/target

rm -f $seqres.full
_scratch_mkfs > $seqres.full 2>&1
_scratch_mount

rm -f $DEVNULL $DEVZERO

mknod $DEVNULL c 1 3 || _fail "Could not create devnull device"
mknod $DEVZERO c 1 5 || _fail "Could not create devzero device"
touch $BINDFILE || _fail "Could not create bind mount file"
touch $TARGET || _fail "Could not create symlink target"
ln -s $TARGET $SYMLINK

_scratch_remount ro || _fail "Could not remount scratch readonly"

# We should be able to read & write to/from these devices even on an RO fs
echo "== try to create new file"
touch $SCRATCH_MNT/this_should_fail 2>&1 | _filter_scratch
echo "== pwrite to null device"
$XFS_IO_PROG -c "pwrite 0 512" $DEVNULL | _filter_xfs_io
echo "== pread from zero device"
$XFS_IO_PROG -c "pread 0 512" $DEVZERO | _filter_xfs_io

echo "== truncating write to null device"
echo foo > $DEVNULL 2>&1 | _filter_scratch
echo "== appending write to null device"
echo foo >> $DEVNULL 2>&1 | _filter_scratch

echo "== writing to symlink from ro fs to rw fs"
# Various combinations of O_CREAT & O_TRUNC
$XFS_IO_PROG -c "pwrite 0 512" $SYMLINK | _filter_xfs_io
$XFS_IO_PROG -f -c "pwrite 0 512" $SYMLINK | _filter_xfs_io
$XFS_IO_PROG -t -c "pwrite 0 512" $SYMLINK | _filter_xfs_io

echo "== write to bind-mounted rw file on ro fs"
mount --bind $TARGET $BINDFILE
# with and without -f (adds O_CREAT)
$XFS_IO_PROG -c "pwrite 0 512" $BINDFILE | _filter_xfs_io
$XFS_IO_PROG -f -c "pwrite 0 512" $BINDFILE | _filter_xfs_io
$XFS_IO_PROG -t -c "pwrite 0 512" $BINDFILE | _filter_xfs_io

# success, all done
status=0
exit