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From: | Paolo Bonzini |
Subject: | [Qemu-devel] Re: [PATCH] Disk image shared and exclusive locks. |
Date: | Mon, 07 Dec 2009 15:38:50 +0100 |
User-agent: | Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.4pre) Gecko/20090922 Fedora/3.0-3.9.b4.fc12 Lightning/1.0pre Thunderbird/3.0b4 |
On 12/07/2009 02:39 PM, Anthony Liguori wrote:
That's a use-case that needs to be thought through. Maybe commit should attempt to force the lower level to acquire a write lock first?
Yes. This is an argument in favor of a "DWIM" lock option instead of giving shared/exclusive choice to the user: do not say what kind of operation you want to do, and let commit upgrade the lock in the future.
If the management tools wants to force shared/exclusive, they can do the locking themselves and tell QEMU to not lock.
Paolo
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