bug#46905: Add a note about ext4's dir_index to the manual

[Tobias Geerinckx-Rice]

Hi Ludo'!

I should note that later in the IRC convo I corrected my sloppy 
‘full’ to ‘hash collision’.  Unfortunately it just returns an 
already overloaded -ENOSPC to user space.

Ludovic Courtès 写道：
> IIRC store accesses were much slower before [dir_index] was a 
> thing

Yes, it's a (t)horny dilemma :-/

> I don’t think we can claim there’s a design flaw.  WDYT?

Fine; implementation flaw, then?  Problem is, it's not like there 
are other implementations than the one we're stuck with, so it 
matters little what we call it.

Kind regards,

T G-R

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