linux-kernel - Re: [RFC 0/7] [RFC] cramfs: fake write support

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Message-ID: <344eb09a0806012307v8a8c0e4pd4ccfd27825cc0c4@mail.gmail.com>
Date:	Mon, 2 Jun 2008 11:37:07 +0530
From:	"Bharata B Rao" <bharata.rao@...il.com>
To:	"Erez Zadok" <ezk@...sunysb.edu>
Cc:	"Arnd Bergmann" <arnd@...db.de>,
	"Jamie Lokier" <jamie@...reable.org>,
	"Phillip Lougher" <phillip@...gher.demon.co.uk>,
	"Jan Engelhardt" <jengelh@...putergmbh.de>,
	"David Newall" <davidn@...idnewall.com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	hch@....de
Subject: Re: [RFC 0/7] [RFC] cramfs: fake write support

On Mon, Jun 2, 2008 at 10:07 AM, Erez Zadok <ezk@...sunysb.edu> wrote:
>
> Nevertheless, I can understand if the embedded community wants lightweight
> unioning.  Union Mounts initially may not support everything that unionfs
> does, but it should be smaller, and it should be enough I believe for the
> basic unioning uses --- perhaps even for the embedded community.  If so,
> then I suggest people offer to help Bharata and Jan Blunk's efforts, rather
> than [sic] cramming unioning into a single file system.
>

Though Union Mount effort has become slow and silent lately, some of
us are still working on it. While I worked on readdir support lately,
Jan Blunck and David Woodhouse are working on having a generic
whiteout support for linux.

Talking about help, Union Mount effort could take a generous help in
getting directory listing implementation right. We first tried to
handle duplicate elimination (during readdir) inside the kernel
entirely. The outcome was neither clean nor efficient.
(http://lkml.org/lkml/2007/12/5/147). Then there was a suggestion to
push the duplicate elimination to userspace. When that was tried out
(http://lkml.org/lkml/2008/4/29/248), we were told that NFS support is
going to be an issue. (BTW NFS support is going to be an issue
irrespective of where directory listing is implemented: kernel or
userspace). Some insights into  feasibility of supporting NFS with
Union Mount from people who understand NFS better would be very
helpful.

Regards,
Bharata.
-- 
http://bharata.sulekha.com/blog/posts.htm
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