F9: fsck gotcha on booting

[Patrick O'Callaghan]

My fstab contains the line:

LABEL=/xtra             /xtra                   ext3    defaults        1 2

which worked fine on F8. Now with F9-Preview the boot process halts with
the following error (I'm working form memory here):

	Fsck: cannot resolve "LABEL=/xtra"

and drops me to a Shell to fix the problem. Two things:

1) From the Shell I can happily "mount /xtra" with no problems, so what
gives?

2) I can't edit /etc/fstab from this Shell. "mount" claims that the
system disk is mounted rw. but when I try to edit fstab "vi" tells me
it's read-only, and in fact "> foo" from the Shell gives the same error.
So I feel I have to ask why is the emergency Shell set up to not let me
edit anything?

poc