linux-ext4 - Re: delayed allocatiou result in Oops

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Message-ID: <4678E20D.6060108@clusterfs.com>
Date:	Wed, 20 Jun 2007 12:15:09 +0400
From:	Alex Tomas <alex@...sterfs.com>
To:	cmm@...ibm.com
CC:	Dmitriy Monakhov <dmonakhov@...ru>, linux-ext4@...r.kernel.org
Subject: Re: delayed allocatiou result in Oops

Mingming Cao wrote:
> Hmm, PageMappedToDisk is probably not sufficient enough for pagesize!
> =blocksize. Is that the reason we need page->private to pass the
> request?

PageMappedToDisk isn't enough in that case, definitely. bh is the way
to track state of each block (this is what i'm implementing now), but
I think current nobh version (per-page flags are used) is valuable.

> That's good to know, thanks for the update. So probably above error case
> handling will be addressed in the new version? 

well, you actually can move that SetPagePrivate() few lines above
(Dmitriy already tested this).

> BTW, can you point me your latest and greatest mballoc patch? I am
> trying to forward port and merge that patch to ext4 patch queue....

I don't have version for mainline yet. will prepare soon. thanks for
your interest.

thanks, Alex

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