##/bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.  All Rights Reserved.
#
# 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 $FSTYP in
    ext2|ext3|ext4|ext4dev|f2fs|reiserfs)
	if [ ! -d /proc/sys/fs/quota ]; then
	    _notrun "Installed kernel does not support quotas"
	fi
	;;
    gfs2|ocfs2|bcachefs)
	;;
    xfs)
	if [ ! -f /proc/fs/xfs/xqmstat ]; then
	    _notrun "Installed kernel does not support XFS quotas"
        fi
	if [ "$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
}

#
# checks that the XFS quota support in the kernel is enabled
# and that we have valid quota user tools installed.
#
_require_xfs_quota()
{
    $here/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"
}

# Check that a mounted fs has a particular type of quota accounting turned on.
#
# The first argument must be the data device of a mounted fs.  It must not be
# the actual mountpath.
#
# The second argument is the quota type ('usrquota', 'grpquota', 'prjquota',
# 'any', or 'all').
_xfs_quota_acct_enabled()
{
	local dev="$1"
	local qtype="$2"
	local f_args=()
	local any=

	case "$qtype" in
	"usrquota"|"uquota")	f_args=("-U");;
	"grpquota"|"gquota")	f_args=("-G");;
	"prjquota"|"pquota")	f_args=("-P");;
	"all")			f_args=("-U" "-G" "-P");;
	"any")			f_args=("-U" "-G" "-P"); any=1;;
	*)			echo "$qtype: Unknown quota type."; return 1;;
	esac

	if [ "$any" = "1" ]; then
		for arg in "$f_args"; do
			$here/src/feature "$arg" "$dev" && return 0
		done
		return 1
	fi

	$here/src/feature "${f_args[@]}" "$dev"
}

# Require that a mounted fs has a particular type of quota turned on.  This
# takes the same arguments as _xfs_quota_acct_enabled.  If the third argument is
# '-u' (or is empty and dev is $SCRATCH_DEV) the fs will be unmounted on
# failure.
_require_xfs_quota_acct_enabled()
{
	local dev="$1"
	local qtype="$2"
	local umount="$3"
	local fsname="$dev"

	_xfs_quota_acct_enabled "$dev" "$qtype" "$qmode" && return 0

	if [ -z "$umount" ] && [ "$dev" = "$SCRATCH_DEV" ]; then
		umount="-u"
	fi
	test "$umount" = "-u" && umount "$dev" &>/dev/null

	case "$dev" in
	"$TEST_DEV")	fsname="test";;
	"$SCRATCH_DEV")	fsname="scratch";;
	esac

	case "$qtype" in
	"any")		qtype="any quotas";;
	"all")		qtype="all quotas";;
	esac

	_notrun "$qtype: accounting not enabled on $fsname filesystem."
}

#
# 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.
# The device must be mounted for detection to work properly.
#
_require_prjquota()
{
    [ -n "$1" ] && _dev="$1" || _dev="$TEST_DEV"
    if [[ "$FSTYP" == ext[234] ]]; then
	dumpe2fs -h $_dev 2>&1 | grep -qw project || \
		_notrun "Project quota not available on this $FSTYP"
    fi
    if [ "$FSTYP" == "f2fs" ]; then
	dump.f2fs $_dev 2>&1 | grep -qw project_quota
	[ $? -ne 0 ] && _notrun "Project quota not enabled in this device $_dev"
	dump.f2fs $_dev 2>&1 | grep -qw quota_ino
	[ $? -ne 0 ] && _notrun "quota sysfile not enabled in this device $_dev"
	cat /sys/fs/f2fs/features/project_quota | grep -qw supported
	[ $? -ne 0 ] && _notrun "Installed kernel does not support project quotas"
	return
    fi
    $here/src/feature -P $_dev
    [ $? -ne 0 ] && _notrun "Installed kernel does not support project quotas"
    if [ "$USE_EXTERNAL" = yes ]; then
	if [ -n "$TEST_RTDEV" -o -n "$SCRATCH_RTDEV" ]; then
	    _notrun "Project quotas not supported on realtime filesystem"
	fi
    fi
}

#
# Do we have GETNEXTQUOTA?  Querying ID 0 should work.
#
_require_getnextquota()
{
	_require_test_program "test-nextquota"
	$here/src/test-nextquota -i 0 -u -d $SCRATCH_DEV &> $seqres.full || \
		_notrun "No GETNEXTQUOTA support"
}

#
# 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()
{
	case $FSTYP in
	ext2|ext3|ext4)
		tune2fs -O quota,project $SCRATCH_DEV >>$seqres.full 2>&1
		_try_scratch_mount >/dev/null 2>&1 \
			|| _notrun "kernel doesn't support project feature on $FSTYP"
		_scratch_unmount
		;;
	f2fs)
		_scratch_mkfs "-O extra_attr -O quota -O project_quota" >> $seqres.full 2>&1
		;;
	esac
}

_require_setquota_project()
{
	setquota --help 2>&1 | \
		grep -q -- "-P, --project[[:space:]]*set limits for project"
	if [ "$?" -ne 0 ];then
		_notrun "setquota doesn't support project quota (-P)"
	fi
}

#
# 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 | grep -Eq '^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_PROG -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_PROG -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 | grep -E '^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
    _try_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
        # try to turn on project quota if it's supported
        if quotaon --help 2>&1 | grep -q -- '--project'; then
            quotaon --project $SCRATCH_MNT >>$seqres.full 2>&1
        fi
    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 $MOUNT_OPTIONS \
	| sed   -e 's/uquota/QUOTA/g'      \
		-e 's/usrquota/QUOTA/g'    \
		-e 's/usrjquota=[^, ]*/QUOTA/g' \
		-e 's/gquota/QUOTA/g'      \
		-e 's/grpquota/QUOTA/g'    \
		-e 's/grpjquota=[^, ]*/QUOTA/g' \
		-e 's/\bpquota/QUOTA/g'    \
		-e 's/prjquota/QUOTA/g'    \
		-e 's/quota/QUOTA/g'       \
		-e 's/uqnoenforce/QUOTA/g' \
		-e 's/gqnoenforce/QUOTA/g' \
		-e 's/pqnoenforce/QUOTA/g' \
		-e 's/qnoenforce/QUOTA/g'  \
		-e "s/QUOTA/$OPTS/g"`

	# ext4 doesn't _do_ "-o pquota/prjquota" because reasons
	# Switch it to "quota" to enable mkfs-time pquota
	if [[ "$FSTYP" == ext[234] ]]; then
		OPTS=`echo $OPTS \
		| sed	-e 's/\bpquota/quota/g'	\
			-e 's/prjquota/quota/g'`
	fi
	# Ensure we have the given quota option - duplicates are fine
	if [ -n "$OPTS" ]; then
		export MOUNT_OPTIONS="$MOUNT_OPTIONS -o $OPTS"
	fi
	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|f2fs|reiserfs|gfs2|bcachefs)
		VFS_QUOTA=1
		quotaon -f -u -g $SCRATCH_MNT 2>/dev/null
		;;
	xfs)
		# Only way to make this reliable with cow/delalloc/speculative
		# preallocations is to unmount and remount the whole mess...
		_scratch_unmount
		_scratch_mount "-o usrquota,grpquota"
		;;
	*)
		;;
	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
	}
}

# Report the block usage of root, $qa_user, and nobody
_report_quota_blocks() {
	repquota $1 | grep -E "^($qa_user|root|nobody)" | awk '{print $1, $3, $4, $5}' | sort -r
}

# Report the inode usage of root, $qa_user, and nobody
_report_quota_inodes() {
	repquota $1 | grep -E "^($qa_user|root|nobody)" | awk '{print $1, $6, $7, $8}' | sort -r
}

# Determine which type of quota we're using
_qsetup()
{
	opt=$1
	enforce=0
	if [ $opt = "u" -o $opt = "uno" ]; then
		type=u
		eval `_choose_uid`
	elif [ $opt = "g" -o $opt = "gno" ]; then
		type=g
		eval `_choose_gid`
	elif [ $opt = "p" -o $opt = "pno" ]; then
		type=p
		eval `_choose_prid`
	fi
	[ $opt = "u" -o $opt = "g" -o $opt = "p" ] && enforce=1

	echo "Using type=$type id=$id" >> $seqres.full
}

# Help to create project quota on directory, works for xfs and other fs.
# Usage: _create_project_quota <dirname> <projid> [name]
# Although the [name] is optional, better to specify it if need a fixed name.
_create_project_quota()
{
	local prjdir=$1
	local id=$2
	local name=$3

	if [ -z "$name" ];then
		name=`echo $projdir | tr \/ \_`
	fi

	rm -rf $prjdir
	mkdir $prjdir
	chmod ugo+rwx $prjdir

	if [ -f /etc/projects -a ! -f $tmp.projects.bk ];then
		cat /etc/projects > $tmp.projects.bk
		echo >/etc/projects
	fi
	if [ -f /etc/projid -a ! -f $tmp.projid.bk ];then
		cat /etc/projid > $tmp.projid.bk
		echo >/etc/projid
	fi

	cat >>/etc/projects <<EOF
$id:$prjdir
EOF
	cat >>/etc/projid <<EOF
$name:$id
EOF
	$XFS_IO_PROG -r -c "chproj $id" -c "chattr +P" $prjdir
}

# If you've called _create_project_quota, then use this function in _cleanup
_restore_project_quota()
{
	if [ -f $tmp.projects.bk ];then
		cat $tmp.projects.bk > /etc/projects && \
			rm -f $tmp.projects.bk
	else
		rm -f /etc/projects
	fi
	if [ -f $tmp.projid.bk ];then
		cat $tmp.projid.bk > /etc/projid && \
			rm -f $tmp.projid.bk
	else
		rm -f /etc/projid
	fi
}

# make sure this script returns success
/bin/true