Walter A. Boring IV 2e9959878b Don't check cinder volume states during attach ...

This patch changes how Nova interacts with volumes at attach time.
Nova should rely upon Cinder's os-reserve to determine if the
state of the volume is in a good/valid state for attaching.
This fixes a race between when nova fetches the volume and calls
os-reserve.

This refactors the volume_api.check_attach a bit and adds a new
check_availability_zone, which is still done on the Nova side.
When Cinder's os-reserve supports passing in the availability
zone, then this check can also be removed.

This patch handles the volume attach API, which is not checked
again in the compute manager. Future patches will handle other
operations like boot from volume and swap volume.

Partial-Bug: #1581230

Change-Id: I5b069ba3480257c061541fc6c19e044c31417b5e

2016-07-22 16:31:49 -04:00

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