Re: [nfsv4] Questions about NFS deamons

On Tue, 15 Jul 2008, msalcedo@inf.puc-rio.br wrote:

> Hello all,
>
> I really want to understand how NFS deamons works. Please, I need your help.
>
This is implementation specific, but I'll try and give generic answers
that, hopefully, won't be too inaccurate for most nfs servers.

> What's the function of the deamon mountd (or rpc.mountd)? How it works?
>
Typically, it talks a separate protocol (the mount protocol) for NFSv2 and
NFSv3 clients (this protocol is no longer used for NFSv4). On some
implementations it also handles the exporting file systems, by maintaining
a database of what is exported and informing the kernel of these exports
via a system call.

> Meet all requests of NFS clients for mounting filesystems ?
See above. For NFSv2 and v3, a client normally talks to mountd first, via 
the mount protocol, in order to acquire an exported file handle for the
mount point. After that, the client uses the nfs protocol.

> Mountd don't "speak" with clients directly  but through the nfsd (another
> deamon)? So, nfsd get clients requests and pass to mountd? Mountd only
> meets nfsd requests ?
Nope, see above.

>
> How nfsd and mountd interacts?
>
There is very little. The nfsd uses the exported file system information 
and that might have been set up by the mountd daemon.

For NFSv4, there is no mount protocol, so a mountd daemon may not be 
needed at all. (If it is needed for an implementation, it will probably
be related to setting up the exported file system information.)

rick
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