linux-ext4 - Re: [PATCH] Add checks to validate extent entries.

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Message-ID: <499004C4.9040305@ph.tum.de>
Date:	Mon, 09 Feb 2009 11:26:12 +0100
From:	Thiemo Nagel <thiemo.nagel@...tum.de>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
CC:	tytso@....edu, linux-ext4@...r.kernel.org
Subject: Re: [PATCH] Add checks to validate extent entries.

Aneesh Kumar K.V wrote:
> This patch adds check to validate the extent entries along
> with extent  headers. Should handle crash with corrupt filesystem.

While your patch probably decreases the average number of checks that
are done, it makes single random accesses quite expensive since always
complete extent blocks are checked at once, even if just a single pblock
is accessed.  No idea whether there are workloads which have that as a
typical access pattern...

Kind regards,

Thiemo
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