linux-ext4 - Re: [PATCH -V3 09/11] ext4: Fix ext4 nomballoc allocator for ENOSPC

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Date:	Thu, 28 Aug 2008 22:06:14 -0700
From:	Mingming Cao <cmm@...ibm.com>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:	tytso@....edu, sandeen@...hat.com, linux-ext4@...r.kernel.org
Subject: Re: [PATCH -V3 09/11] ext4: Fix ext4 nomballoc allocator for ENOSPC


在 2008-08-29五的 09:14 +0530，Aneesh Kumar K.V写道：
> On Thu, Aug 28, 2008 at 02:57:49PM -0700, Mingming Cao wrote:
> > 
> > From: Mingming Cao <cmm@...ibm.com>
> > 
> > ext4: Fix ext4 nomballoc allocator for ENOSPC
> >     
> > We run into ENOSPC error on nonmballoc ext4, even when there is free blocks
> > on the filesystem.
> > 
> > The problem is triggered in the case the goal block group has 0 free blocks
> > , and the rest block groups are skipped due to the check of "free_blocks 
> > < windowsz/2".
> 
> The goal block group had free blocks < windowsz .
> 
Hmm, if the goal block group had free blocks, why allocation failed
(reservation is turned off by setting my_rsv as NULL)? I wonder if there
is other threads trying to allocating in the same goal block group at
the same time, steal the last free blocks?

Mingming

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