linux-kernel - Re: [PATCH 03/17] VFS: Implement handling for pathless pioctls

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Message-id: <20090617074711.GZ13073@webber.adilger.int>
Date:	Wed, 17 Jun 2009 01:47:11 -0600
From:	Andreas Dilger <adilger@....com>
To:	David Howells <dhowells@...hat.com>
Cc:	torvalds@...l.org, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linux-afs@...ts.infradead.org,
	linux-fsdevel@...r.kernel.org, Wang Lei <wang840925@...il.com>
Subject: Re: [PATCH 03/17] VFS: Implement handling for pathless pioctls

On Jun 16, 2009  21:39 +0100, David Howells wrote:
> Implement handling for pathless pioctls.  Because these take no path argument,
> there's no way to know for certain which filesystem they're aimed at, so we
> have to switch on command number instead.  This patch allows interested parties
> to register handlers.  Each registered handler function is tried in turn until
> one doesn't return -EOPNOTSUPP.
> 
> This is required because OpenAFS implemented a number of AFS calls that don't
> get given a path as they're aimed at AFS in general, and not at a particular
> file, volume or cell in the AFS world.

Wouldn't it make a lot more sense to create a virtual device, open the
mountpoint, or do _something_ that associates these calls with AFS
directly instead of having the kernel magically route the call to a
specific filesystem?

Not that I agree with having a filesystem-specific syscall either
(sys_reiserfs() was not allowed either :-), but wouldn't even that
be better suited to doing AFS-specific things?

Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.

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