What is the device for /tmp in a default FC5 logical volume setup?

[Dunhausen]

I would have thought it was /dev/shm, because my /etc/fstab has this line

tmpfs                   /dev/shm                tmpfs   defaults        0 0

However, when this part runs in a startup script to automatically encrypt my /tmp directory, I get an error about not being able to mount the block device:

 	echo -n "Mounting encrypted $TMPDEV on /tmp"
		$cryptsetup -c aes-cbc-essiv:sha256 -d /dev/urandom create $CRYPTONAME $TMPDEV && \
		$mke2fs -q -m 0 /dev/mapper/$CRYPTONAME >& /dev/null && \
		mount /dev/mapper/$CRYPTONAME /tmp && \
		chmod 1777 /tmp && daemon /bin/true || daemon /bin/false

where I've set $TMPDEV to /dev/shm.

In the old days, my /tmp directory would be something like /dev/hda10, I've been reading up on the LVM stuff but I've not been able to figure out what I need to do differently.

[markkuk]

/tmp is by default a subdirectory on the root filesystem, not a separate volume. /dev/shm is used for shared memory functions. If you want a separate logical volume for /tmp, just create one by yourself.