Re: [Netnice-kernels] NNFS was: Re: Sourceforge Account

[Scott B. <sco...@ve...>]

Hi Takashi,

> 
> my point is this: please use the CDROM system, to learn how it works. it
> is a working specification, you need to use for your linux-NNFS. but, to
> study how it is implemented on FreeBSD, please use the FreeBSD5/NNFS
> implementation, by checking out the source from our CVS repository.
> otherwise, you'll have a hard time to understand the messy implementation.
> (i think you're on the right track about this, right? since you're mentioning
> nnfs_vncache_alloc()... just in case.)
> 
> http://cvs.sourceforge.net/viewcvs.py/netnice/FreeBSD5/?only_with_tag=netnice53
> 
> thanks!!
> 

Thanks, I was working from the FreeBSD5 branch with the netnice521 tag.  I 
have since done cvs update -r netnice53 and will reference these files in 
the future.  

Been using the Boot CD and experimenting with the fundamentals of the nnfs
filesystem using the /proc/network/lo0/vif1, setting a symlink in
/proc/curproc/sockets and using telnet to localhost.

I am getting more comfortable with the internals. The VFS interface is
different under Linux than FreeBSD in that Linux VFS is more OO.  On
FreeBSD NNFS there are a lot of functions with switch statements
branching on the type of nnfs node (root vif, vif, virtual file,
etc...) .  On Linux VFS the different inodes (vnodes on BSD) each
contain function pointers which differ depending on the inode type.  I
think this will make the code smaller in the end.  

I think I should proceed with the mkdir/rmdir operation first, I think
this is relatively straight forward and maybe a small piece of the
control file implementation.  Next should come the implementation of
the <pid>/sockets directory, the code here will come from the existing
procfs code.  After that would be the symlink operation between the
socket and the and the vif, I suspect that this may be the most
difficult.

I will be going out of town tomorrow and will return Tuesday.  Looking
forward to a conference call next week when I return.


Thanks,


Scott Brumbaugh