Re: missing partitions under /dev

[Corinna Vinschen <corinna-cygwin at cygwin dot com>]

Hi Aaron,

On Jun 10 21:45, Corinna Vinschen wrote:
> On Jun 10 20:51, Corinna Vinschen wrote:
> > On Jun 10 16:59, Aaron Schneider wrote:
> > > > Date: Fri, 10 Jun 2016 12:00:27 +0200
> > > > From: corinna-cygwin@cygwin.com
> > > >
> > > > Cygwin's /dev/sd* emulation doesn't support more than 15 partitions yet.
> > > > This would need some rework of the device naming code.
> > > >
> > > >
> > > > Corinna
> > > 
> > > I see. I though that it was a Windows problem that didn't provide
> > > the partitions properly to cygwin if they weren't formatted with a
> > > known filesystem or something related.Â
> > > 
> > > Isn't any other way to access those partitions even from WindowsÂ
> > > Powershell?
> > 
> > There may be a way even using Cygwin.  If you know which disk X it is,
> > you could try accessing it via /proc/sys/Device/HarddiskX/PartitionY.
> > No guarantee but for raw access this might be sufficient.
> > 
> > > Is the feature to support more than 15 partition planned
> > > toÂbe implemented? 		 	   		  
> > 
> > I looked into that and theoretically the changes are small.
> > 
> > However, there's an undesired side-effect.  The device parser code uses
> > an auto-generated minimally pruned 0-trie, created by a tool called
> > shilka.  The problem is that the resulting object file is already very
> > big, compared to the rest of the DLL.
> 
> > Amazing but true, about 20% of
> > the object file is just this trie code and its data, whihc,
> 
> Uh, this sentence makes no sense.  Let's try again:
> 
>  Amazing but true, about 20% of the Cygwin DLL size is just this device
>  parser code and its data, which...
> 
> > IMHO, is
> > already quite bad.  By adding support for partitions 16-63, this object
> > code gets 2.5 times bigger!
> > 
> > This is way too much, and I think what we have to do first is to 
> > replace this autogenerated 0-trie code by some simpler, hand-written
> > parser before we can consider adding support for more partitions.

I uploaded a new snapshot to https://cygwin.com/snapshots/ which
reduces the parser size and adds support for partitions 16 to 63.
Please give it a try.

Also, please note that this snapshot won't work on XP or Server 2003
anymore.


Thanks,
Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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