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Date: Tue, 14 Nov 2000 19:25:22 +0100
From: Jan Kara <jack@atrey.karlin.mff.cuni.cz>
To: Petr Vandrovec <VANDROVE@vc.cvut.cz>
Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: Re: Used space in bytes
Message-ID: <20001114192522.A18870@atrey.karlin.mff.cuni.cz>
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> On 14 Nov 00 at 18:39, Jan Kara wrote:
> >   Hello.
> > 
> > > On  9 Nov 00 at 19:18, Jan Kara wrote:
> > > > used (I tried to contact Ulrich Drepper <drepper@redhat.com> who should
> > > > be right person to ask about such things (at least I was said so) but go
> > > > no answer...). Does anybody have any better solution?
> > > >   I know about two others - really ugly ones:
> > > >    1) fs specific ioctl()
> > > >    2) compute needed number of bytes from st_size and st_blocks, which is
> > > >       currently possible but won't be in future
> > > 
> > > If I may, please do not add it into stat/stat64 structure. On Netware, 
> > > computing really used space can take eons because of it has to read 
> > > allocation tables to memory to find size. It is usually about 500% 
> > > slower than retrieving all other file informations.
> >   And how do you fill in st_blocks field?
> 
> Currently as st_size / st_blksize. If I'll want to report real used size,
> so that quotas could be built on the top of Netware space restrictions,
> Netware is willing to return size in its allocation blocks after holes 
> and compression takes place, but while computation time is afforable for 
> open(), it is not for stat()ing thousands of entries in directories.
  Hmm.. But that's problem as 'quotacheck' uses stat to get space used by
file... So it won't work on Netware anyway.

							Honza

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