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List:       fuse-devel
Subject:    Re: [fuse-devel] Accessing the underlying directory when
From:       John Hendrikx <hjohn () xs4all ! nl>
Date:       2009-07-17 13:18:32
Message-ID: 4A607A28.9050601 () xs4all ! nl
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Miklos Szeredi wrote:
> On Thu, 16 Jul 2009, Mike Morrison wrote:
>   
>> John Hendrikx <hjohn@xs4all.nl> writes:
>>
>>     
>>> Hi all,
>>>
>>> How does one access the directory your Fuse filesystem was mounted on
>>> top of?
>>>
>>> For example, I would like to mount a thin layer on top of an existing
>>> directory (let's say /music).  However, as soon as my fs is mounted  
>>> and
>>> I do an ls, it results in an infinite (getattr) loop and I'm forced to
>>> umount -f the filesystem.  This is not too surprising, but how do I
>>> avoid it?
>>>
>>> I seem to remember seeing this explained somewhere, but after googling
>>> and checking the archives of this list I couldn't find how this is  
>>> done.
>>>
>>> Any help appreciated,
>>> --John
>>>       
>> Perhaps I'm misunderstanding the question, but I've seen the  
>> combination of:
>>
>> In main():
>>    cwd = open(mountpoint, O_RDONLY);
>>
>> In FUSE init():
>>    fchdir(cwd);
>>    close(cwd);
>>
>> and from then out, use paths relative to mountpoint.
>>     
>
>
> Yes, apparently that will work too.  But this behavior is probably
> highly Linux specific, AFAIK there's no standard that says fchdir()
> does not follow mounts...
>
> Thanks,
> Miklos
>
>   

Thanks for the help, what Mike posted was what I was looking for and 
couldn't find again.

BTW, the fuse-devel mailinglist seems very bugged to me.  I see these 
messages, but they donot appear in the fuse mailinglist (it's cc'd but I 
don't see them there).  Also I had to prepend [fuse-devel] manually to 
the subject to even get my message to show up on the list. 

Others may have similar troubles as I donot think I did anything special 
(I routinely monitor a dozen mailinglists, and only fuse-devel is giving 
me troubles).

--John

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