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

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Message-ID: <14280.1268939924@jrobl>
Date:	Fri, 19 Mar 2010 04:18:44 +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:
> Hm, I don't understand how handing it off to another thread would
> help.  The thing I am worried about is some internal assumption in the
> file system that a directory without write permission can't be
> changed.  Totally manufactured example:
>
> somefs_create()
> {
> 	BUG_ON(IS_RDONLY(dir->d_inode);
> [...]
> }

While I don't know whether there suce fs exists or not, for such fs we
cannot create files. I agree with you.


J. R. Okajima
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