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

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Date:	Thu, 18 Jun 2009 14:50:02 +0200
From:	Olivier Galibert <galibert@...ox.com>
To:	David Howells <dhowells@...hat.com>
Cc:	Al Viro <viro@...IV.linux.org.uk>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andreas Dilger <adilger@....com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>, akpm@...ux-foundation.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-afs@...ts.infradead.org
Subject: Re: [PATCH 00/17] [RFC] AFS: Implement OpenAFS pioctls(version)s

On Wed, Jun 17, 2009 at 08:28:29PM +0100, David Howells wrote:
> Al Viro <viro@...IV.linux.org.uk> 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
them?

  OG.

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