Re: reiser4 plugins

[Hans Reiser]

David Masover wrote:

>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...
>  
>
Can you explain this idea at greater length?

>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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