Hi,
I saw these two elements are included in struct scsi_device, i.e.
device_busy and device_blocked.
But I am wondering what the difference between these two variables
are?Or in other words, what do these two variables mean?
struct scsi_device {
struct Scsi_Host *host;
struct request_queue *request_queue;
/* the next two are protected by the host->host_lock */
struct list_head siblings; /* list of all devices on this host */
struct list_head same_target_siblings; /* just the devices sharing
same target id */
/* this is now protected by the request_queue->queue_lock */
unsigned int device_busy; /* commands actually active on
* low-level. protected by queue_lock.
*/
...
unsigned int device_blocked; /* Device returned QUEUE_FULL. */
...
}
Thanks
Jason
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