linux-ext4 - Re: delayed allocatiou result in Oops

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Message-ID: <20070619215005.GU5181@schatzie.adilger.int>
Date:	Tue, 19 Jun 2007 15:50:05 -0600
From:	Andreas Dilger <adilger@...sterfs.com>
To:	Dmitry Monakhov <dmonakhov@...ru>
Cc:	Alex Tomas <alex@...sterfs.com>, cmm@...ibm.com,
	linux-ext4@...r.kernel.org
Subject: Re: delayed allocatiou result in Oops

On Jun 19, 2007  13:16 +0400, Dmitry Monakhov wrote:
> But whole approach based on using PagePrivate bit and page->private
> ptr for special purposes is realy dengerous, and imho wrong,
> because avery fs-related code assume that page->private points to
> page_buffers.

This is actually a misconception.  page->private can be anything.  While
many fs helper routines use page->private as buffers, that only happens
when the fs itself causes those helper routines to be called.  Lustre,
for example, has no buffer heads on the clients, and uses page->private
to track RPC batching information and data checksums.

Cheers, Andreas
--
Andreas Dilger
Principal Software Engineer
Cluster File Systems, Inc.

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