Re: Persistent module data

[Jeff Mahoney <jeffm@suse.com>]

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sirpj@ecs.csus.edu wrote:
| Hi,
|
| I signed up a while ago. Because I am working at LLNL as an Intern and
| have been given a neat assignment that involves coding some extensions
| to reiser. I am implementing a file queueing mechanism that maintains
| files as they are written in FIFO order. When you call ioctl() the 'next
| file' in the queue is returned.
|
| I have the FIFO queue implemented as a linked list that keeps track of
| the file names and directory inodes that they are associated with. (This
| was my first stab at it).
|
| My question is about data preservation from inside a FS... I want to
| preserve the contents of my queue in case of a crash. When mount is
| called I want to scan this list and rebuild the queues in memory. Is it
| possible to write data out to a persistent file from within the system?
| Would using the module parameter approach be a good way to go? . . . But
| from what I understand it wouldn't necessarily export the data if the
| system hangs and the module can't be removed.
|
| If anyone can help, has ideas, or some pointers, I would be very
| grateful.

For pointers on how to do this, have a look at the reiserfs xattr
implementation. It manages normal files itself and hides them from the
user. Since you're working with reiserfs, you could probably put the
file underneath the .reiserfs_priv directory, and get all the hiding for
free.

- -Jeff

- --
Jeff Mahoney
SuSE Labs
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