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

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Date:	Thu, 28 Aug 2008 11:20:51 -0700
From:	"H. Peter Anvin" <hpa@...nel.org>
To:	Tejun Heo <tj@...nel.org>
CC:	fuse-devel@...ts.sourceforge.net, miklos@...redi.hu,
	greg@...ah.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/7] FUSE: implement ioctl support

Tejun Heo wrote:
> ioctl support is tricky to implement because only the ioctl
> implementation itself knows which memory regions need to be read
> and/or written.  To support this, fuse client can request retry of
> ioctl specifying memory regions to read and write.  Deep copying
> (nested pointers) can be implemented by retrying multiple times
> resolving one depth of dereference at a time.

Okay, I'm going to say it... wouldn't it be better to have some kind of 
data structure description language which the userspace can register 
with the kernel to linearize the data on a per-ioctl basis (kind of like 
rpcgen)?

	-hpa
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