Re: [Qemu-devel] [RFC v4 17/21] blockjobs: add PENDING status and event

[Kevin Wolf]

Am 24.02.2018 um 00:51 hat John Snow geschrieben:
> 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.
> 
> Transitions:
> 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.
> 
> Verbs:
> Cancel: Can be applied to a pending job.
> 
>              +---------+
>              |UNDEFINED|
>              +--+------+
>                 |
>              +--v----+
>              |CREATED+-----------------+
>              +--+----+                 |
>                 |                      |
>              +--+----+     +------+    |
>    +---------+RUNNING<----->PAUSED|    |
>    |         +--+-+--+     +------+    |
>    |            | |                    |
>    |            | +------------------+ |
>    |            |                    | |
>    |         +--v--+       +-------+ | |
>    +---------+READY<------->STANDBY| | |
>    |         +--+--+       +-------+ | |
>    |            |                    | |
>    |         +--v----+               | |
>    +---------+WAITING+---------------+ |
>    |         +--+----+                 |
>    |            |                      |
>    |         +--v----+                 |
>    +---------+PENDING|                 |
>    |         +--+----+                 |
>    |            |                      |
> +--v-----+   +--v------+               |
> |ABORTING+--->CONCLUDED|               |
> +--------+   +--+------+               |
>                 |                      |
>              +--v-+                    |
>              |NULL+--------------------+
>              +----+
> 
> Signed-off-by: John Snow <address@hidden>

Your diagram lost two arrow heads in this commit. :-)

Reviewed-by: Kevin Wolf <address@hidden>