linux-kernel - Re: [GIT PULL -mm] Unionfs branch management code

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Message-ID: <461BC7EC.5080101@cs.columbia.edu>
Date:	Tue, 10 Apr 2007 13:22:52 -0400
From:	Shaya Potter <spotter@...columbia.edu>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	"Josef 'Jeff' Sipek" <jsipek@...sunysb.edu>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [GIT PULL -mm] Unionfs branch management code

Andrew Morton wrote:
> On Mon,  9 Apr 2007 10:53:51 -0400 "Josef 'Jeff' Sipek" <jsipek@...sunysb.edu> wrote:
> 
>> The following patches introduce new branch-management code into Unionfs as
>> well as fix a number of stability issues and resource leaks.
> 
> I have a mental note that unionfs is in the "stuck" state, due to general
> agreement that we should implement this functionality at the VFS level, one
> reason for which is unionfs's upper-vs-lower coherency problems.

How can a union file system with a decent set of useful semantics be 
fully implemented at the VFS layer in a "clean" manner?

For instance, a major use of unionfs is live CDs, namely unionfs w/ a 
read-only and read-write layer.  Unionfs enables files to be copied up 
from the read-only layer to the read-write layer.

Does one really want to implement "copyup" in the VFS?

just my 2 agarot.
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