linux-kernel - Re: Status of union-mount?

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Message-ID: <3190.1363916335@warthog.procyon.org.uk>
Date:	Fri, 22 Mar 2013 01:38:55 +0000
From:	David Howells <dhowells@...hat.com>
To:	sedat.dilek@...il.com
Cc:	dhowells@...hat.com, Al Viro <viro@...iv.linux.org.uk>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: Status of union-mount?

Sedat Dilek <sedat.dilek@...il.com> wrote:

> Hmmm, sorry for asking, but when do you plan to offer a "working"
> union-mount (u-m)?

It's a maze of twisty locking problems - some of which also apply to things
like overlayfs:-(

> What's the status of the user-space tools or are they no more needed?

You need to be able to tell mount(2) that you want a union.  This is currently
done with a mount flag, but it might be portable to something in the mount
option string.

> AFAICS the original authors patched e2fsprogs etc. (see Valerie's old
> homepage [1]).

Yeah... I guess fsck programs need to be able to handle whiteout and fallthru
directory entries.

> >> Where does the development happen - in [1]?
> >
> > On a git tree on my PC - which is occasionally mirrored in [1] when I've got
> > it working.
> >
> 
> Development on your local workstation does not look like you do an
> open development.

Excuse me.  But it's quite hard to develop this on a remote git tree.
Further, I prefer not to push partially working stuff to my git tree, lest
someone pull it, try playing with it and have their fs eaten.

If someone wants it, I can mail the partially working stuff to them, but not
many people ask.

> So, it's currently only you doing the work on u-m?

Almost entirely, yes.

David
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