[Bug 73301] Documentation misses case of link, linkat, symlink, symlinkat giving ENOENT for a directory with a reference only held by a process

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https://bugzilla.kernel.org/show_bug.cgi?id=73301

--- Comment #3 from Steven Stewart-Gallus <sstewartgallus00@xxxxxxxxxxxxxxx> ---
On further reflection, this is not a problem with the documentation of
symlink, symlinkat, link and linkat but a problem with the
documentation of ENOENT and what a nonexisting directory actually
means.

I suppose how one might describe the situation is that when a
directory is unlinked from a filesystem (but still has process
references to it) it enters a zombie state where many filesystem calls
become inappropriate to use on it.

I'm not sure where such documentation should be placed. We already
have shm_overview(7), mq_overview(7) and such; and I think if we had a
dir_overview(7) that would be the perfect place to put this corner
case. dir_overview(7) might be too big project for not really any gain
though.

> I'd be willing to give it a shot, but, first,I'm not sure what if
> anything to say about the symlink() case. Do you have a more
> realistic example of that case?

Nope. People should probably be able to figure that out from the
description of the symlink case. I was just pointing it out for
completeness and I'd be fine if that case was omitted.

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