linux-kernel - Re: [RFC PATCH] Show data flow for file copyup in unions

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Date:	Thu, 18 Mar 2010 17:10:57 +0900
From:	"J. R. Okajima" <hooanon05@...oo.co.jp>
To:	Valerie Aurora <vaurora@...hat.com>
Cc:	Alexander Viro <viro@...iv.linux.org.uk>,
	Miklos Szeredi <miklos@...redi.hu>,
	Dmitry Monakhov <dmonakhov@...nvz.org>,
	Jeff Layton <jlayton@...hat.com>,
	Christoph Hellwig <hch@...radead.org>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] Show data flow for file copyup in unions


Valerie Aurora:
> I think what people will expect is that we copy up in that case.  I
> can think of ways this can go wrong, but perhaps that should be an
> explicit requirement on the top-layer file system, that it can handle
> create/unlink() in a directory without write permission.

I am not sure such requirement is the right way.
How about delegating open() to keventd or some other workqueue which
will succeed to create files under a directory without write permission?
Of course, we should handle some error cases after creating a file.


J. R. Okajima
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