What's the best way to check if device is already deactivated ?

Hi,
Planning to post a patch within a shell script , how about simply check
if /dev/mapper/DEV_NAME exist is well enough ?

	if [ -e /dev/mapper/$target ];then
		...
	else
		...
	fi

	Thanks.

Best Regards,
Aaron Lewis - PGP: 0xDFE6C29E ( http://keyserver.veridis.com )
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