[uml-devel] os_lock_file removal

[uml-devel] os_lock_file removal

[Allan Graves]

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Hi guys.  I'm working on developing a cluster file system and I'd like 
to simulate concurrent shared storage access using uml and disk files.  
I traced down the file locking, and it seems that (assuming I have a 
cluster file system that keeps things up to date in the metadata of the 
filesystem) if I remove this function I should be able to have more than 
1 instance accessing storage at the same time.  I realize this is a bit 
dangerous, since it involves *all* block devices,  but I don't see a 
much better way.  COW is not what I'm looking for, and that seems to be 
the standard answer.  Can anyone provide positive or negative feedback 
on this approach?  Possibly a better approach? 
Thanks,
Allan Graves

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Re: [uml-devel] os_lock_file removal

[Jeff Dike]

On Fri, Jun 24, 2005 at 03:19:53PM -0400, Allan Graves wrote:
> Hi guys.  I'm working on developing a cluster file system and I'd like 
> to simulate concurrent shared storage access using uml and disk files.  
> I traced down the file locking, and it seems that (assuming I have a 
> cluster file system that keeps things up to date in the metadata of the 
> filesystem) if I remove this function I should be able to have more than 
> 1 instance accessing storage at the same time.  

Feel free to remove it if you personally guarantee that you will not run
two UMLs on the same host file without using a clusterfs.

It's purely a safety measure - if you're doing development using scratch
filesystems, it's not really benefitting you.

				Jeff


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