Accessing on-disk datastructures from a module

[Martin DeMello]

On Wed, Jan 19, 2011 at 1:03 PM, Manish Katiyar <mkatiyar at gmail.com> wrote:
> On Tue, Jan 18, 2011 at 11:23 PM, Martin DeMello
> <martindemello at gmail.com> wrote:
>> I would like to maintain some filesystem metadata as an on-disk
>> datastructure that can be read and written to from within the
>> filesystem module. I know file access from within the kernel is a bad
>> idea; what is the recommended alternative for this?
>
> You can try to have a reserved inode and use that.

That is what I was trying to do, but I can't find any documentation on
how to read/write to it. Could you point me towards some docs or
examples?

martin