linux-kernel - Re: [PATCH] Add MS_BIND

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Message-Id: <1203031982.18860.60.camel@heimdal.trondhjem.org>
Date:	Thu, 14 Feb 2008 18:33:02 -0500
From:	Trond Myklebust <trond.myklebust@....uio.no>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	menage@...gle.com, viro@...iv.linux.org.uk,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] Add MS_BIND_FLAGS mount flag


On Thu, 2008-02-14 at 23:18 +0100, Miklos Szeredi wrote:

> I understand perfectly that this is what you want to do.  And I'm
> saying that the following code snippet should do exactly the same,
> without having to add a new syscall:
> 
> 	char tmpbuf[64];
> 	sprintf(tmpbuf, "/proc/self/fd/%i", fd);
> 	mount(dev_name, tmpbuf, type, flags, data);
> 
> [ You could actually try to read people's responses, instead of
> immediately assuming they don't understand :-/ ]

I did read your reply, but the follow-link magic that is performed in
proc_fd_link() wasn't immediately obvious to someone who is unfamiliar
with that code. I understand where you're coming from now.

Anyhow, that does indeed look as if it will do what is needed for the
automounter.

   Trond

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