Add volume event handling to virtio scsi driver #1628
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Virtio scsi uses the event queue to pass asynchronous information about volumes added or removed. This change implements handling of these events. Virtio scsi disks for a scsi device are now stored in a vector for lookup by the event handler. The rescan event sends an inquiry to the lun specified in the event, unless than lun is zero, which triggers a report luns for the target, as indicated by the specification. LUNs that are detected in this rescan are not re-added if they already exist in the disk list.
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Virtio scsi uses the event queue to pass asynchronous information about
volumes added or removed. This change implements handling of these events.
Virtio scsi disks for a scsi device are now stored in a vector for lookup
by the event handler. The rescan event sends an inquiry to the lun specified
in the event, unless than lun is zero, which triggers a report luns for
the target, as indicated by the specification. LUNs that are detected in this
rescan are not re-added if they already exist in the disk list.
I had implemented handling of unit attention sense codes but I could not trigger
them on GCP, so I left it out of this PR as I was unable to test it and that handling
is more complicated.