linux-kernel - Re: [RFC PATCH] file as directory

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Message-ID: <20070523102437.GS4095@ftp.linux.org.uk>
Date:	Wed, 23 May 2007 11:24:38 +0100
From:	Al Viro <viro@....linux.org.uk>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	akpm@...ux-foundation.org, torvalds@...ux-foundation.org
Subject: Re: [RFC PATCH] file as directory

On Wed, May 23, 2007 at 12:09:19PM +0200, Miklos Szeredi wrote:
> Right.  After locking vfsmount_lock, mount_dironfile() should recheck
> if there was a race and bail out.

Owww...  Not pretty, that...

> I don't think the filesystem ought to try _creating_ a vfsmount.  I
> imagine, that the fs has already a kernel-internal mounted for this
> kind of stuff, and it just supplies a dentry from that.  The vfsmount
> isn't actually important, but it should be readily available, and it's
> easier to clone from a vfsmount/dentry pair.

I don't get it.  What's the point of that exercise, then?  When do you
create that kernel-internal mount?

> As I said, the superblock should be persistent, so we'll get a stable
> st_dev for multiple mounts.

OK, but then I guess I don't understand the intended use.
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