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Date: Wed, 16 Sep 2009 08:32:12 -0400
Message-ID: <194f62550909160532q248cb45coee639a2da10292a@mail.gmail.com>
Subject: Re: Howto switch off ext4's delayed allocation?
From: Clemens Eisserer <linuxhippy@gmail.com>
To: linux-kernel@vger.kernel.org
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Hi,

Just happend again to me.
After the intel driver crashed my system, the source-file I was
working on was empty. Fourtunatly eclipse has a history-log.

Isn't there a way to switch off the more "dangerous" optimizations in ext4?
I already searched howto do this, but from what I've seen there was
only discussion about providing a switch for disabling delayed
allocation, but it was never done?

Thanks, Clemens

2009/9/9 Clemens Eisserer <linuxhippy@gmail.com>:
> Hi,
>
> Every since switching to ext4, I suffer fromt he empty files problem
> after crashes.
> Since GEM/KMS was included, as well as the changes to the usb-serial
> subsystem I experience crashes from time to time.
>
> As far as I understand this is caused by delayed allocation.
> I really enjoy the performance benefits of ext4, and I know
> applications should be fixed - but having this problem seen with so
> many apps I doubt it will ever happen. (Kwrite, bash itself, umtsmon,
> ...).
>
> Is there any way to disable delayed allocation? (running 2.6.31rc8)
>
> Thank you in advance, Clemens
>
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