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From: Alexander Zarochentcev <zam@namesys.com>
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Date: Tue, 5 Nov 2002 11:49:16 +0300
To: reiser@namesys.com
Cc: Nikita Danilov <Nikita@namesys.com>, Tomas Szepe <szepe@pinerecords.com>,
       lkml <linux-kernel@vger.kernel.org>, Oleg Drokin <green@namesys.com>,
       umka <umka@namesys.com>
Subject: Re: [BK][PATCH] Reiser4, will double Linux FS performance, pleaseapply
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reiser writes:
 > Alexander Zarochentcev wrote:
 > 
 > > > >
 > > > >In reiser4 allocation of disk space is delayed to transaction commit. It
 > > > >is not possible to estimate precisely amount of disk space that will be
 > > > >allocated during commit, and hence statfs(2) results are not updated
 > > > >until one does sync(2) (forcing commit) or transaction is committed due
 > > > >to age (10 minutes by default).
 > > > >
 > > > >  
 > > > >
 > > > The above is badly phrased, and the behavior complained of is indeed a 
 > > > bug not a feature.  Please fix.  
 > > > 
 > > > statfs should be updated immediately in accordance with estimates used 
 > > > by the space reservation code, and then adjusted at commit time in 
 > > > accordance with actual usage.
 > >
 > >We should not do that unless we implement forcing of commits at out of free
 > >space situation.
 > >
 > I thought we had agreed to do forcing of commits at out of free space 
 > quite some time ago?  In any event, we should do forcing of commits at 
 > out of free space.  Yes?

we will control this by a block allocator flag, we set it when we can close
current transaction. I think for most cases it will be set.
 

-- 
Alex.
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