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

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Message-Id: <E1KYn0U-00047F-Qa@pomaz-ex.szeredi.hu>
Date:	Thu, 28 Aug 2008 21:18:10 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	hpa@...nel.org
CC:	tj@...nel.org, 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

On Thu, 28 Aug 2008, H. Peter Anvin wrote:
> Tejun Heo wrote:
> > 
> > Ah.... funky.  If this retry thing is too repulsive, I guess the best
> > alternative would be directly accessing caller's memory as Miklos suggested.
> > 
> 
> Be careful -- there are some serious dragons there in the presence of 
> multiple threads.

OK, it should map /proc/pid/task/tid/mem.  Or rather
/proc/tid/task/tid/mem, as the pid (tgid) of the caller is not
currently passed to the filesystem.

Miklos
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