linux-kernel - Re: [PATCH 01/17] VFS: Implement the pioctl() system call

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Date:	Tue, 16 Jun 2009 16:54:54 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	David Howells <dhowells@...hat.com>
Cc:	torvalds@...l.org, akpm@...ux-foundation.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Jacob Thebault-Spieker <summatusmentis@...il.com>,
	linux-afs@...ts.infradead.org
Subject: Re: [PATCH 01/17] VFS: Implement the pioctl() system call

On Tue, Jun 16, 2009 at 09:38:51PM +0100, David Howells wrote:
> From: Jacob Thebault-Spieker <summatusmentis@...il.com>
> 
> Implement the pioctl() system call.  This is used to support a number of AFS
> functions, and could also be used for Coda and other filesystems.

Umm, adding a new system call multiplexer without any structure is a
serious no-go.  And this one is much worse than ioctl, which with a
fixed [fd,cmd,arg] tuple seems like a stronhold of sanity compred to this
monster with multiple arguments and a path that may or may not be there.

I think you'd be better of writing tools that use a sane interface than
adding a big pile of crap like this to the kernel.

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