linux-kernel - Re: [PATCH 15/32] union-mount: Documentation

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Date:	Mon, 25 May 2009 15:25:43 +0900
From:	hooanon05@...oo.co.jp
To:	Jan Blunck <jblunck@...e.de>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	viro@...iv.linux.org.uk, bharata@...ibm.com, dwmw2@...radead.org,
	mszeredi@...e.cz, vaurora@...hat.com
Subject: Re: [PATCH 15/32] union-mount: Documentation 


Jan Blunck:
> +Rename across different levels of the union is implemented as a copy-up
> +operation for regular files. Rename of directories simply returns EXDEV, the
> +same as if we tried to rename across different mounts. Most applications have
> +to handle this case anyway. Some applications do not expect EXDEV on
> +rename operations within the same directory, but these applications will also
> +be broken with bind mounts.

Is renaming a regular file supported?
Accrding to the change in "[PATCH 24/32] union-mount: in-kernel file
copy between union mounted filesystems", every rename under union seems
to be rejected.

link(2) may be similar.
When a "fileA" exists in the lower fs only, link("fileA", "new_file")
will return EXDEV too.


J. R. Okajima
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