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Re: [Qemu-devel] [PATCH] Add tar container format

From: Anthony Liguori
Subject: Re: [Qemu-devel] [PATCH] Add tar container format
Date: Thu, 13 Aug 2009 18:13:27 -0500
User-agent: Thunderbird (X11/20090320)

Alexander Graf wrote:

I'd almost rather see something like gio integration so that this sort of generic filesystem stuff could live somewhere else. I'm curious what others think though. Does it seem reasonable to include this type of functionality?

A plugin infrastructure sounds nice at first, but doesn't do all the fedoras and ubuntus out there too much good ;-).

If we did plugins, it would not be a GPL-safe boundary so all plugins would be forced to be GPL.

What's attractive about doing plugins for the block layer is that we have a relatively stable interface for block drivers. The current AIO ops should be good for a very long time so API churn shouldn't be a major issue. The code is all pretty well isolated today.

As part of the longer term refactoring, I think it also makes sense to split the block layer into a library that can be consumed independent of QEMU. Obviously, folks want to make use of our block code who don't care at all about QEMU. A lot of people use qemu-img for vmdk manipulation, for instance. It also makes tools like qemu-iotest able to consume the block layer in a saner way.

If others agree, I think we should start going down this road. block-tar/block-dictzip seem like obvious candidates for plugins.


Anthony Liguori


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