linux-kernel - Re: [PATCH 00/13] overlay filesystem: request for inclusion (v15)

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Date:	Thu, 20 Sep 2012 22:48:06 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	"J. R. Okajima" <hooanon05@...oo.co.jp>
Cc:	viro@...IV.linux.org.uk, torvalds@...ux-foundation.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	hch@...radead.org, akpm@...ux-foundation.org, apw@...onical.com,
	nbd@...nwrt.org, neilb@...e.de, jordipujolp@...il.com,
	ezk@....cs.sunysb.edu, dhowells@...hat.com,
	sedat.dilek@...glemail.com
Subject: Re: [PATCH 00/13] overlay filesystem: request for inclusion (v15)

"J. R. Okajima" <hooanon05@...oo.co.jp> writes:

> Miklos, how do you think about this?
> <http://marc.info/?l=linux-kernel&m=123938533724484&w=2>
> Do you think UnionMount is totally gone?

Unionmount provides almost the same functionality as overlayfs.  The big
difference between the two is that unionmounts resides 100% in the VFS
while 95% of overlayfs is plain filesystem code.  I think that's the
biggest advantage: filesystem code is easier to maintain, has less
impact on core complexity, etc.

Aufs provides much better filesystem semantics than either unionmounts
or overlayfs.  But that does come at a price:

aufs:       98 files changed, 29893 insertions(+), 7 deletions(-)
overlayfs:  22 files changed, 2981 insertions(+), 10 deletions(-)

Thanks,
Miklos
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