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Date: Thu, 23 Oct 2003 10:55:12 +0200
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: /proc/partitions question
Message-ID: <20031023085512.GV1653@cygbert.vinschen.de>
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References: <OF2F4D9013 DOT 064D29F0-ONC1256DC7 DOT 004D9A96 AT icos DOT be>
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On Wed, Oct 22, 2003 at 04:21:43PM +0200, erik DOT cumps AT icos DOT be wrote:
> Sorry, lost the previous mail so can't continue the thread.
> 
> I took a look at the sources as cgf suggested and
> have the following question:
> 
> in fhandler_proc.cc revision 1.36,
> in function format_proc_partitions() :
> 
> after getting the drive geometry with
> 'IOCTL_DISK_GET_DRIVE_GEOMETRY'
> the size of the disk is calculated in bytes and this number is
> right-shifted 6 bits, so that's a division by 64 and that maps
> with the scaling difference of 16 between df and /proc/partitions.
> 
> likewise after getting the drive's partition layout with
> 'IOCTL_DISK_GET_DRIVE_LAYOUT'
> the length of each parititions (which is in bytes) is again
> right-shifted 6 bits.
> 
> So why the right-shift 6 instead of 10 which would map
> with a blocksize of 1K?

Thanks for tracking this down.  I've applied a patch to Cygwin.  You
should find the corrected version in the next developers snapshot.

Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Developer                                mailto:cygwin AT cygwin DOT com
Red Hat, Inc.

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