Accessing filesystem from a KLD

[Seb]

Hello,
How can I access the filesystem from a kernel module ?
In fact, I want my device driver to retreive a firmware image stored on the 
filesystem (instead of putting the firmware data in a static array at 
compile-time) for memory usage and legal concerns. Blocking calls are OK.
I have searched the manpages and the web, but I haven't found anything 
relevant.
Thanks,
Sebastien