dmhugedisk

##/bin/bash
# Routines for creating huge (fake) disks
#-----------------------------------------------------------------------
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#-----------------------------------------------------------------------

_require_dmhugedisk()
{
	_require_dm_target zero
	_require_dm_target snapshot
}

_dmhugedisk_init()
{
	test -z "$1" && _fatal "must specify sector count to _dmhugedisk_init"
	local dm_backing_dev=$SCRATCH_DEV

	$DMSETUP_PROG remove huge-test > /dev/null 2>&1
	$DMSETUP_PROG remove huge-test-zero > /dev/null 2>&1

	local blk_dev_size=$1

	DMHUGEDISK_ZERO='/dev/mapper/huge-test-zero'
	DMHUGEDISK_DEV='/dev/mapper/huge-test'

	DMHUGEDISK_ZERO_TABLE="0 $blk_dev_size zero"
	DMHUGEDISK_DEV_TABLE="0 $blk_dev_size snapshot $DMHUGEDISK_ZERO $SCRATCH_DEV N 512"

	$DMSETUP_PROG create huge-test-zero --table "$DMHUGEDISK_ZERO_TABLE" || \
		_fatal "failed to create dm huge zero device"
	$DMSETUP_PROG create huge-test --table "$DMHUGEDISK_DEV_TABLE" || \
		_fatal "failed to create dm huge device"
}

_dmhugedisk_cleanup()
{
	$UMOUNT_PROG $SCRATCH_MNT > /dev/null 2>&1
	# wait for device to be fully settled so that 'dmsetup remove' doesn't
	# fail due to EBUSY
	$UDEV_SETTLE_PROG >/dev/null 2>&1
	$DMSETUP_PROG remove huge-test > /dev/null 2>&1
	$DMSETUP_PROG remove huge-test-zero > /dev/null 2>&1
}