BZ#6895: Describe DT_LNK

[Nix]

On 8 Apr 2012, Andreas Jaeger uttered the following:

> On 04/08/2012 06:33 PM, Paul Eggert wrote:
>> On 04/08/2012 08:09 AM, Andreas Jaeger wrote:
>>> DT_WHT is still not documented - and set by the coda FS only.
>>> Google could not help me with an explanation what it is.
>>
>> Presumably that's for BSD-style whiteouts.
>> For more, please see:
>>
>> Aurora V. Union file systems: implementations, part I.
>> LWN.net 2009-03-25<http://lwn.net/Articles/325369/>.
>
> Thanks, Paul. Reading this, I think that DT_WHT should not be seen by
> userland apps and filtered out by readdir. In that case, let's not
> document it. What do you think of removing it from dirent.h?

Note that Coda is not a union filesystem in this sense: it has userspace
helpers as well, and DT_WHT can be returned by the Coda library's
userspace readdir function. I'm not certain that nothing relies on it.

Jan?

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