linux-kernel - Re: [PATCH 21/38] union-mount: Support for mounting union mount file systems

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Message-ID: <20100716210539.GE21201@shell>
Date:	Fri, 16 Jul 2010 17:05:40 -0400
From:	Valerie Aurora <vaurora@...hat.com>
To:	Ian Kent <raven@...maw.net>
Cc:	Alexander Viro <viro@...iv.linux.org.uk>,
	Miklos Szeredi <miklos@...redi.hu>,
	Jan Blunck <jblunck@...e.de>,
	Christoph Hellwig <hch@...radead.org>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 21/38] union-mount: Support for mounting union mount file systems

On Tue, Jul 13, 2010 at 12:47:02PM +0800, Ian Kent wrote:
> On Tue, Jun 15, 2010 at 11:39:51AM -0700, Valerie Aurora wrote:
> > +/**
> > + * prepare_mnt_union - do setup necessary for a union mount
> > + *
> > + * @topmost_mnt: vfsmount of topmost layer
> > + * @mntpnt: path of requested mountpoint
> > + *
> > + * A union mount clones the underlying read-only mounts and keeps them
> > + * in its own internal list of of vfsmounts, hanging off the
> > + * superblock.  The first underlying mount (at @mntpnt) has passed
> > + * check_mnt_union(), so we know we have at least one layer of union
> > + * mount underneath this one.  We union every underlying file system
> > + * that is mounted on the same mountpoint (well, pathname) and
> > + * read-only.
> 
> Last sentence looks a bit odd, would this be better?
> 
> We union every underlying file system that is mounted read-only on the
> same mountpoint (well, pathname).

Hm, I appear to have re-written that in the latest set of patches.

-VAL
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