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SubjectRe: [PATCH 00/13] cross rename v4
On Thu, Feb 13, 2014 at 5:42 PM, David Howells <> wrote:
> Miklos Szeredi <> wrote:
>> Regarding whiteouts, I raised a couple of questions that nobody answered
>> yet, so let me ask again.
>> - If a filesystem containing whiteouts (fallthroughs, etc...) is mounted as
>> not part of a union, how are these special entities represented to
>> userspace?
> I would suggest that whiteouts appear as otherwise negative dentries and that
> they don't appear in getdents().

I'd argue that this is an administration nightmare. E.g. what if the
a backup needs to be made of the rw layer?

Will rmdir work normally in a directory containing whiteouts? Will
the VFS take care of that, just like if it was part of a union? Or
will it fail with ENOTEMPTY despite *appearing* empty?

And zillion other problems related to the fact that things happen to a
filesystem even when they do not appear to happen ("mv foo bar; mv bar
foo" has side effects).


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