Softupdates a mount option?

[Bernd Walter]

On Thu, May 27, 2004 at 05:45:50PM +0200, Ivan Voras wrote:
> Bernd Walter wrote:
> 
> >>>SU makes perfectly sense for swap backed md drives.
> >>
> >>I always thought the "swap backed" meant the memory is allocated from the 
> >>same pool as for userland applications, e.g. they only get swapped out if 
> >>memory is scarce. Is this wrong?
> >
> >
> >You are right, but md(4) doesn't know about the filesystem and therefor
> >can't know which blocks have content to keep and which are unused.
> >SU now allows files that are deleted quite fast to never touch the
> >block device and md never need to write those blocks into swap storage
> >as they never got dirty.
> 
> As opposed to the 'async' mode?

I think all async mode files get writen sooner or later even if already
deleted, but I'm not shure.

-- 
B.Walter                   BWCT                http://www.bwct.de
bernd at bwct.de                                  info at bwct.de