Disk Device Protocols
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disk device job progress update message

target:		Registered progress update BMessenger for the given job
message:	B_DISK_DEVICE_JOB_UPDATE
			"job_id": B_INT32_TYPE
			"progress": B_UINT8_TYPE
			[ "description": B_STRING_TYPE ]
reply:      none (asynchronous message)

message fields:
- job_id: Unique job identifier
- progress: Percent of job completed (0 to 100)
- description: Optional description of current action being taken, i.e.
               "allocating inodes", "writing superblock", etc.

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disk device job finished message

target:		Registered progress update BMessenger for the given job
message:	B_DISK_DEVICE_JOB_FINISHED
			"job_id": B_INT32_TYPE
reply:      none (asynchronous message)

message fields:
- job_id: Unique job identifier

notes:
A separate job finished message is needed, as rounding error in
the computation of job progress may result in multiple
B_DISK_DEVICE_JOB_UPDATE messages with "progress" fields of 100.

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