Re: VFS mediator?

[Trond Myklebust <trond.myklebust@fys.uio.no>]

>>>>> " " == Pavel Machek <pavel@suse.cz> writes:

     > Okay, take userland nfs-server. (This thread was about userland
     > filesystems).

Yech... Nobody should be seriously considering using unfsd: it does
not even manage to follow the NFS protocol. That inability was one of
the many reasons why Olaf Kirch abandoned further develpement of unfsd
and started work on knfsd.

     > Then, make memory full of dirty pages. Imagine that nfs-server
     > is swapped-out by some bad luck. What you have is extremely
     > nasty deadlock, AFAICS. [To free memory you have to write out
     > dirty data, but you can't do that because you don't have enough
     > memory for nfs-server].

So that is another argument for using knfsd rather than unfsd. I will
agree with you that NFS is not perfect, but please judge it on its
actual merits and not on some trumped up charge...

Cheers,
  Trond