#!/bin/sh -e

. /usr/share/ganeti/extstorage/zfs/defaults.sh

# gnt-instance grow-disk t-plain 0 100M
# lvextend -L +102400k --test --alloc contiguous /dev/ffzgvg/fa2e60f4-22e5-4620-baac-385418139ce7.disk0
# lvextend -L +102400k --test --alloc cling /dev/ffzgvg/fa2e60f4-22e5-4620-baac-385418139ce7.disk0
# lvextend -L +102400k --test --alloc normal /dev/ffzgvg/fa2e60f4-22e5-4620-baac-385418139ce7.disk0

if echo $* | grep -q $EXTP_VG ; then
	TEST='-'
	while [ ! -z "$1" ] ; do
		case $1 in 

		-L*) VOL_SIZE_INC=`echo $2 | sed -e 's/-L//' -e 's/^\+//' -e 's/k$//'` ;;
		--test)  TEST='test' ;;
		/dev/$EXTP_VG/*) VOL_NAME=`echo $1 | cut -d/ -f4`

		esac
		shift
	done

	if [ $TEST = 'test' ] ; then

		available=`zfs get -H -p available -o value $EXTP_ZFS/$VOL_NAME`
		if [ `expr $available \/ 1024` -gt $VOL_SIZE_INC ] ; then
			exit 0 # OK to enlarge
		else
			exit 1
		fi

	else

		volsize=`zfs get -H -p volsize -o value $EXTP_ZFS/$VOL_NAME`
		zfs set volsize=`expr $volsize \/ 1024 + $VOL_SIZE_INC`k $EXTP_ZFS/$VOL_NAME

	fi

else
	/sbin/lvm lvextend $*
fi