Some concern about the journal support

[Bean]

Hi,

I think we need to disable journal sometimes. Tools like grub-setup
and grub-install is run in an active system, that means sectors could
easily end up in the journal. However, journal is a temperately
buffer, space can be reused after a while. In this case, we should
bypass the journal and access the underlying file system directly.
Perhaps we can use a variable like no_journal to control the journal
support, any suggestions ?

-- 
Bean