linux-kernel - Re: [PATCH 5/7] FUSE: implement ioctl support

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Message-Id: <E1KYoX9-0004Mn-NX@pomaz-ex.szeredi.hu>
Date:	Thu, 28 Aug 2008 22:55:59 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	hpa@...nel.org
CC:	miklos@...redi.hu, tj@...nel.org, fuse-devel@...ts.sourceforge.net,
	greg@...ah.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/7] FUSE: implement ioctl support

On Thu, 28 Aug 2008, H. Peter Anvin wrote:
> This is *hard* to get right, and we screw this up in the kernel with 
> painful regularity.  The throught of having user-space processes, which 
> don't have access to the kernel locking primitives and functions like 
> copy_from_user() dealing with this stuff scares me crazy.

What issues exactly are you thinking of?

> That is why I'm suggesting using an in-kernel linearizer.

Lots of complexity, ugh...  Even Tejun's current scheme is better IMO.

Miklos

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