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Re: [Qemu-block] [Qemu-devel] [RFC v4 17/21] blockjobs: add PENDING stat

From: Eric Blake
Subject: Re: [Qemu-block] [Qemu-devel] [RFC v4 17/21] blockjobs: add PENDING status and event
Date: Tue, 27 Feb 2018 14:05:58 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0

On 02/23/2018 05:51 PM, John Snow wrote:
For jobs utilizing the new manual workflow, we intend to prohibit
them from modifying the block graph until the management layer provides
an explicit ACK via block-job-finalize to move the process forward.

To distinguish this runstate from "ready" or "waiting," we add a new
"pending" event.

For now, the transition from PENDING to CONCLUDED/ABORTING is automatic,
but a future commit will add the explicit block-job-finalize step.

Waiting -> Pending:   Normal transition.
Pending -> Concluded: Normal transition.
Pending -> Aborting:  Late transactional failures and cancellations.

Removed Transitions:
Waiting -> Concluded: Jobs must go to PENDING first.

Cancel: Can be applied to a pending job.

+# Emitted when a block job is awaiting explicit authorization to finalize graph
+# changes via @block-job-finalize. If this job is part of a transaction, it 
+# not emit this event until the transaction has converged first.

Same question of whether this new event is always emitted (and older clients presumably ignore it), or only emitted for clients that requested new-style state management.

Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org

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