linux-kernel - Re: [PATCH 5/5] CUSE: implement CUSE

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Message-ID: <20080828221525.GA2855@kroah.com>
Date:	Thu, 28 Aug 2008 15:15:25 -0700
From:	Greg KH <greg@...ah.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Tejun Heo <tj@...nel.org>, fuse-devel@...ts.sourceforge.net,
	miklos@...redi.hu, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/5] CUSE: implement CUSE - Character device in
	Userspace

On Thu, Aug 28, 2008 at 01:07:40PM -0700, Andrew Morton wrote:
> On Fri, 29 Aug 2008 03:19:04 +0900
> Tejun Heo <tj@...nel.org> wrote:
> > +#define fc_to_cc(_fc)		container_of((_fc), struct cuse_conn, fc)
> > +#define cdev_to_cc(_cdev)	container_of((_cdev), struct cuse_conn, cdev)
> > +#define cuse_conn_get(cc)	({mntget((cc)->mnt); cc;})
> > +#define cuse_conn_put(cc)	mntput((cc)->mnt)
> 
> I believe all the above could be implemented in C.

"traditionally" container_of() is used in #define, not a function call
as it is just pointer math that can be done at compile time.

thanks,

greg k-h
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