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
