Messages in this thread | | | Date | Mon, 18 Mar 2002 23:38:27 +0100 | From | Pavel Machek <> | Subject | Re: VFS mediator? |
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Hi!
> >> * NFS (v2,v3): Portable. And that's the only good thing to say > >> about it - it's stateless, it has messy semantics all over the > >> place and implementing userland server requires a lot of glue. > > > Does not work... If you mount nfs server on localhost, you can > > deadlock. > > Huh? Examples please? A hell of a lot of work has gone into ensuring > that this cannot happen. I do most of my NFS client work on this sort > of setup, so it had bloody well better work...
Okay, take userland nfs-server. (This thread was about userland filesystems).
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]. Pavel -- Casualities in World Trade Center: ~3k dead inside the building, cryptography in U.S.A. and free speech in Czech Republic. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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