linux-ext4 - Re: persistent preallocation

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Message-ID: <87aap4aqrf.fsf@dmon-lap.sw.ru>
Date:	Tue, 03 Aug 2010 15:18:28 +0400
From:	Dmitry Monakhov <dmonakhov@...nvz.org>
To:	Bo Brantén <bosse@....umu.se>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: persistent preallocation

Bo Brantén <bosse@....umu.se> writes:

> Hello,
>
> I have a question on the implementation of persistent preallocation,
> the reason to not return the disk block is because it can contain old
> data but I wonder if an implementation has to return zeros instead or
Please look at fallocate(2) syscall.
> if it could return any garbage as long as it is not _that_ garbage?
Off course it is not a garbage, it is old user's data which may be
very very useful (old passwords, cookies, and etc)for person who has
time to analyze it :)
>
> Bo Branten
>
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