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

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Message-ID: <48B6E79E.6020702@kernel.org>
Date:	Thu, 28 Aug 2008 19:59:58 +0200
From:	Tejun Heo <tj@...nel.org>
To:	Greg KH <greg@...ah.com>
CC:	fuse-devel@...ts.sourceforge.net, miklos@...redi.hu,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/7] FUSE: implement ioctl support

Greg KH wrote:
> Why do we need ioctls?  For CUSE?  In that case, would we need to copy
> the memory from userspace, into the kernel, and then back out into
> userspace again?  Can't we just have a "pass-through" type fixed ioctl
> instead?

Can you elaborate a bit?  How the fixed ioctl would know how much to
copy in and out and from where?

Thanks.

-- 
tejun
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