##/bin/bash
#
# Copyright (c) 2000-2001,2005 Silicon Graphics, 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
#
#
# Functions useful for quota tests
#

#
# checks that the generic quota support in the kernel is enabled
# and that we have valid quota user tools installed.
#
_require_quota()
{
    [ -n "$QUOTA_PROG" ] || _notrun "Quota user tools not installed"

    case $FSTYP in
    ext2|ext3|ext4|ext4dev|reiserfs)
	if [ ! -d /proc/sys/fs/quota ]; then
	    _notrun "Installed kernel does not support quotas"
	fi
	;;
    gfs2)
	;;
    xfs)
	if [ ! -f /proc/fs/xfs/xqmstat ]; then
	    _notrun "Installed kernel does not support XFS quotas"
        fi
	if [ "$USE_EXTERNAL" = yes -a ! -z "$TEST_RTDEV" ]; then
	    _notrun "Quotas not supported on realtime test device"
	fi
	if [ "$USE_EXTERNAL" = yes -a ! -z "$SCRATCH_RTDEV" ]; then
	    _notrun "Quotas not supported on realtime scratch device"
	fi
	;;
    *)
	_notrun "disk quotas not supported by this filesystem type: $FSTYP"
	;;
    esac

    # SELinux adds extra xattrs which can mess up our expected output.
    # So, mount with a context, and they won't be created
    # nfs_t is a "liberal" context so we can use it.
    if [ -x /usr/sbin/selinuxenabled ] && /usr/sbin/selinuxenabled; then
        export SELINUX_MOUNT_OPTIONS="-o context=system_u:object_r:nfs_t:s0"
    fi
}

#
# checks that the XFS quota support in the kernel is enabled
# and that we have valid quota user tools installed.
#
_require_xfs_quota()
{
    src/feature -q $TEST_DEV
    [ $? -ne 0 ] && _notrun "Installed kernel does not support XFS quota"
    if [ "$USE_EXTERNAL" = yes -a ! -z "$TEST_RTDEV" ]; then
	_notrun "Quotas not supported on realtime test device"
    fi
    if [ "$USE_EXTERNAL" = yes -a ! -z "$SCRATCH_RTDEV" ]; then
	_notrun "Quotas not supported on realtime scratch device"
    fi
    [ -n "$XFS_QUOTA_PROG" ] || _notrun "XFS quota user tools not installed"
}

#
# checks that xfs_quota can operate on foreign (non-xfs) filesystems
# Skips check on xfs filesystems, old xfs_quota is fine there.
# Appends "-f" to enable foreign behavior on non-xfs filesystems if available.
#
_require_xfs_quota_foreign()
{
	if [ "$FSTYP" != "xfs" ]; then
		$XFS_QUOTA_PROG -f -V &>/dev/null || \
		 _notrun "xfs_quota binary does not support foreign filesystems"
		XFS_QUOTA_PROG="$XFS_QUOTA_PROG -f"
	fi
}

#
# checks that the project quota support in the kernel is enabled.
#
_require_prjquota()
{
    [ -n "$1" ] && _dev="$1" || _dev="$TEST_DEV"
    if [ "$FSTYP" == "ext4" ]; then
	dumpe2fs -h $_dev 2>&1 | grep -qw project || \
		_notrun "Project quota not available on this ext4"
    fi
    src/feature -P $_dev
    [ $? -ne 0 ] && _notrun "Installed kernel does not support project quotas"
    if [ "$USE_EXTERNAL" = yes -a ! -z "$_dev" ]; then
	_notrun "Project quotas not supported on realtime filesystem"
    fi
}

#
# ext4 (for now) is unique in that we must enable the project quota feature
# prior to mount.  This is a relatively new feature ...
_scratch_enable_pquota()
{
	[ "$FSTYP" != "ext4" ] && return

	tune2fs -O quota,project $SCRATCH_DEV >>$seqres.full 2>&1
}

#
# checks for user nobody in /etc/passwd and /etc/group.
#
_require_nobody()
{
    _cat_passwd | grep -q '^nobody'
    [ $? -ne 0 ] && _notrun "password file does not contain user nobody."

    _cat_group | egrep -q '^no(body|group)'
    [ $? -ne 0 ] && _notrun "group file does not contain nobody/nogroup."
}

# create a file as a specific user (uid)
# takes filename, id, type (u/g/p), blocksize, blockcount
#
_file_as_id()
{
    [ $# != 5 ] && _fail "broken call to _file_as_id in test $seq"

    parent=`dirname $1`
    if [ $3 = p ]; then
	echo PARENT: xfs_io -r -c "chproj $2" -c "chattr +P" $parent >>$seqres.full
	$XFS_IO_PROG -r -c "chproj $2" -c "chattr +P" $parent >>$seqres.full 2>&1
	magik='$>'	# (irrelevent, above set projid-inherit-on-parent)
    elif [ $3 = u ]; then
	magik='$>'	# perlspeak for effective uid
    elif [ $3 = g ]; then
	magik='$)'	# perlspeak for effective gid
    else
	_notrun "broken type in call to _file_as_id in test $seq"
    fi

    perl <<EOF >>$seqres.full 2>&1
	\$| = 1;
	$magik = $2;
	if ($5 == 0) {
	    print "touch $1";
	    exec "touch $1";
	} else {
	    print "dd if=/dev/zero of=$1 bs=$4 count=$5";
	    exec "dd if=/dev/zero of=$1 bs=$4 count=$5";
	}
EOF
# for debugging the above euid change, try... [need write in cwd]
#	exec "dd if=/dev/zero of=$1 bs=$4 count=$5 >>$seqres.full 2>&1";

    if [ $3 = p ]; then
	echo PARENT: xfs_io -r -c "chproj 0" -c "chattr -P" $parent >>$seqres.full
	$XFS_IO_PROG -r -c "chproj 0" -c "chattr -P" $parent >>$seqres.full 2>&1
    fi
}

_choose_uid()
{
    _cat_passwd | grep '^nobody' | perl -ne '@a = split(/:/); END { printf "id=%d name=%s\n", $a[2],$a[0] }'
}

_choose_gid()
{
    _cat_group | egrep '^no(body|group)' | perl -ne '@a = split(/:/); END { printf "id=%d name=%s\n", $a[2],$a[0] }'
}

_choose_prid()
{
    if [ "X$projid_file" == "X" ]; then
	projid_file=/etc/projid
    fi
    if [ ! -f $projid_file ]; then
	echo 0
	return
    fi
    perl -ne '@a = split(/:/); END { printf "id=%d name=%s\n", $a[1],$a[0] }' \
	$projid_file
}

_qmount()
{
    _scratch_unmount >/dev/null 2>&1
    _scratch_mount || _fail "qmount failed"
    # xfs doesn't need these setups and quotacheck even fails on xfs
    # redirect the output to $seqres.full for debug purpose and ignore results
    if [ "$FSTYP" != "xfs" ]; then
        quotacheck -ug $SCRATCH_MNT >>$seqres.full 2>&1
        quotaon -ug $SCRATCH_MNT >>$seqres.full 2>&1
    fi
    chmod ugo+rwx $SCRATCH_MNT
}

#
# Ensures only the given quota mount option is used
#
_qmount_option()
{
	OPTS=$1

	# Replace any user defined quota options
	# with the quota option that we want.
	# Simplest to do this rather than delete existing ones first because
	# of the variety of commas and spaces and multiple -o's
	# that we'd have to cater for. Doesn't matter if we have duplicates.
	# Use "QUOTA" string so that we don't have any substring confusion
	# thanks to "quota" which will match with "uquota" and "gquota" etc.
	export MOUNT_OPTIONS=`echo $MOUNT_OPTIONS \
	| sed   -e 's/uquota/QUOTA/g'      \
		-e 's/usrquota/QUOTA/g'    \
		-e 's/gquota/QUOTA/g'      \
		-e 's/grpquota/QUOTA/g'    \
		-e 's/\bpquota/QUOTA/g'    \
		-e 's/prjquota/QUOTA/g'    \
		-e 's/quota/QUOTA/g'       \
		-e 's/uqnoenforce/QUOTA/g' \
		-e 's/gqnoenforce/QUOTA/g' \
		-e 's/pqnoenforce/QUOTA/g' \
		-e 's/qnoenforce/QUOTA/g'  \
		-e "s/QUOTA/$OPTS/g"`

	# ext4 doesn't _do_ "-o pquota/prjquota" because reasons
	# Switch it to "quota" to enable mkfs-time pquota
	if [ "$FSTYP" == "ext4" ]; then
		OPTS=`echo $OPTS \
		| sed	-e 's/\bpquota/quota/g'	\
			-e 's/prjquota/quota/g'`
	fi
	# Ensure we have the given quota option - duplicates are fine
	export MOUNT_OPTIONS="$MOUNT_OPTIONS -o $OPTS"
	echo "MOUNT_OPTIONS = $MOUNT_OPTIONS" >>$seqres.full
}

_check_quota_usage()
{
	# Sync to get delalloc to disk
	sync

	# kill caches to guarantee removal speculative delalloc
	# XXX: really need an ioctl instead of this big hammer
	echo 3 > /proc/sys/vm/drop_caches

	VFS_QUOTA=0
	case $FSTYP in
	ext2|ext3|ext4|ext4dev|reiserfs|gfs2)
		VFS_QUOTA=1
		quotaon -f -u -g $SCRATCH_MNT 2>/dev/null
		;;
	*)
		;;
	esac
	repquota -u -n $SCRATCH_MNT  | grep -v "^#0" | _filter_scratch |
		sort >$tmp.user.orig
	repquota -g -n $SCRATCH_MNT  | grep -v "^#0" | _filter_scratch |
		sort >$tmp.group.orig
	if [ $VFS_QUOTA -eq 1 ]; then
		quotacheck -u -g $SCRATCH_MNT 2>/dev/null
	else
		# use XFS method to force quotacheck
		xfs_quota -x -c "off -ug" $SCRATCH_MNT
		_scratch_unmount
		_scratch_mount "-o usrquota,grpquota"
	fi
	repquota -u -n $SCRATCH_MNT  | grep -v "^#0" | _filter_scratch |
		sort >$tmp.user.checked
	repquota -g -n $SCRATCH_MNT  | grep -v "^#0" | _filter_scratch |
		sort >$tmp.group.checked
	if [ $VFS_QUOTA -eq 1 ]; then
		quotaon -u -g $SCRATCH_MNT 2>/dev/null
	fi
	{
		echo "Comparing user usage"
		diff $tmp.user.orig $tmp.user.checked
	} && {
		echo "Comparing group usage"
		diff $tmp.group.orig $tmp.group.checked
	}
}

# make sure this script returns success
/bin/true
