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From: | Avi Kivity |
Subject: | Re: [Qemu-devel] qcow2 - safe on kill? safe on power fail? |
Date: | Tue, 22 Jul 2008 17:36:24 +0300 |
User-agent: | Thunderbird 2.0.0.14 (X11/20080501) |
Anthony Liguori wrote:
Avi Kivity wrote:Journalling is so out of fashion. It's better to sequence the operations so that failure results in a leak instead of corruption.Since the metadata is being updated synchronously, you could probably get away with a pretty simple journal. Maybe even a single field that contains the offset you are allocating which then gets reset once the allocation was completed.
Why would you want to get away with a simple journal when you can get away without one?
It's a simple matter of allocating, making sure the allocation is on disk, and recording that allocation in the tables.
-- I have a truly marvellous patch that fixes the bug which this signature is too narrow to contain.
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