Re: reiser4 plugins

[David Masover]

Hans Reiser wrote:
> Hubert Chan wrote:
> 
> 
>>On Fri, 01 Jul 2005 03:06:19 -0500, David Masover <ninja@xxxxxxxxxxxx> said:
>>
>> 
>>
>>
>>>Hubert Chan wrote:
>>>   
>>>
>>
>> 
>>
>>
>>>>The main thing blocking file-as-dir is that there are some
>>>>locking(IIRC?) issues.  And, of course, some people wouldn't want it
>>>>to be merged into the mainline kernel.  (Of course, the latter
>>>>doesn't prevent Namesys from maintaining their own patches for people
>>>>to play around with.)
>>>>     
>>>>
>>
>> 
>>
>>
>>>What's the locking issue?  I think that was more about transactions...
>>>   
>>>
>>
>>It was whatever was Al Viro's (technical) complaint about file-as-dir.
>>I don't remember exactly what it was.  The technical people know what it
>>is (and the Namesys guys are probably working on it), and the exact
>>issue doesn't concern us non-technical people that much, so I don't feel
>>like looking it up.  But if you want to, just look for Al Viro's message
>>in this thread.
>>
>> 
>>
> 
> Cycle detection when hard links to directories are allowed.  There is a
> debate over whether cycle detection is feasible that can only be
> resolved by working code or a formal proof that it is not
> computationally feasible.

Ah.  But then, one solution was to avoid the issue at all, and have the
directory inside a file act as a mountpoint.  After all, mount --bind
doesn't cause problems...

Hey!  This sounds like metafs (/meta) already!  I wonder if we can do
file-as-dir in /meta, and just not support user-created hardlinks there?
 (other than creating brand-new files, of course...)
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