Re: [PATCH 00/17] [RFC] AFS: Implement OpenAFS pioctls(version)s

From: Olivier Galibert
Date: Thu Jun 18 2009 - 08:50:54 EST

On Wed, Jun 17, 2009 at 08:28:29PM +0100, David Howells wrote:
> Al Viro <viro@xxxxxxxxxxxxxxxxxx> wrote:
> > ... so we need a syscall that would do that "drop the caches" operation.
> > _After_ having decided that it's really needed for symlinks.
> If you want to support disconnected operation, then you need a way to (a) lock
> an object in the cache, (b) unlock an object in the cache, (c) pull an object
> into the cache, (d) kick an object out of the cache, (e) ban an object from the
> cache, (f) reserve space in the cache for an object, (g) release the
> reservation on an object and (h) find out the lock/ban/reservation status of an
> object in the cache, and you'd need to support them for _all_ file types,
> including dirs, symlinks, dev files and fifos. Probably not UNIX sockets,
> though.

If I follow correctly, what you call "object" is "anything a name can
point to in a filesystem", and you need to be able to refer to any of
them without side effects. So, Al, whay should be used to refer to


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