Re: Elastic Quota File System (EQFS)

[Pavel Machek <pavel@ucw.cz>]

Hi!

> >This sounds like a hack to get around a badly designed system with too
> I do believe that this system can be done in userspace, but it has its 
> own flaws then. Suppose theres a daemon, call it eqfsd. It forks parent 
> listens a char device, child watches the disk space usage. A kernel 
> module reports the file deletes, chowns to the char device, parent does 
> the needfull. Child 'periodically' checks that the threshold is not 
> reached. Here what can be done is suppose a user can transfer data with  
> say 5 Mbps speed to his account....then we can easily get the
> minimum 

I believe I can write data at 1GB/sec at common hardware (~RAM
speed). You'll either need a *lot* of free space, or very fast
polling, and it will still break when the daemon is swapped out, when
scheduler decides writer is more important etc.
								Pavel
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