Disk Device Protocols=====================disk device job scheduled messagetarget: Registered job update BMessengersmessage: B_DISK_DEVICE_JOB_SCHEDULED"job_id": B_INT32_TYPEreply: none (asynchronous message)message fields:- job_id: Unique job identifier-----------------------------------------------------------------------disk device job initiated messagetarget: Registered job update BMessengersmessage: B_DISK_DEVICE_JOB_INITIATED"job_id": B_INT32_TYPEreply: none (asynchronous message)message fields:- job_id: Unique job identifier-----------------------------------------------------------------------disk device job canceled messagetarget: Registered job update BMessengersmessage: B_DISK_DEVICE_JOB_CANCELED"job_id": B_INT32_TYPEreply: none (asynchronous message)message fields:- job_id: Unique job identifier-----------------------------------------------------------------------disk device job finished messagetarget: Registered job update BMessengersmessage: B_DISK_DEVICE_JOB_FINISHED"job_id": B_INT32_TYPE"succeeded": B_BOOL_TYPE[ "info": B_STRING_TYPE ]reply: none (asynchronous message)message fields:- job_id: Unique job identifier- info: Optional description of success or failurenotes:A separate job finished message is needed, as rounding error inthe computation of job progress may result in multipleB_DISK_DEVICE_JOB_UPDATE messages with "progress" fields of 100.-----------------------------------------------------------------------disk device job simple progress update messagetarget: Registered job simple progress update BMessengersmessage: B_DISK_DEVICE_JOB_SIMPLE_PROGRESS"job_id": B_INT32_TYPE"progress": B_UINT8_TYPE"info": B_STRING_TYPEreply: none (asynchronous message)message fields:- job_id: Unique job identifier- progress: Percent of job completed (0 to 100)- info: Description of current action being taken, i.e."allocating inodes", "writing superblock", etc.-----------------------------------------------------------------------disk device job extra progress update messagetarget: Registered job extra progress update BMessengersmessage: B_DISK_DEVICE_JOB_EXTRA_PROGRESS"job_id": B_INT32_TYPE"info": B_STRING_TYPEreply: none (asynchronous message)message fields:- job_id: Unique job identifier- info: Extended progress info string, i.e. "block 123: foundinvalid inode; fixing"-----------------------------------------------------------------------