scsi_debug version 1.68 mark III

Changelog since version 1.68 mark II:
  - merge Mike Anderson's probe() cleanup
     - num_devs is now "per host"
     - num_devs is sysfs writeable
  - add slave_alloc skeleton code

So to simulate 154 disks (for example) one might use:
  # modprobe scsi_debug add_host=11 num_devs=14

With max_luns at its default value of 2, 14 is the
maximum number of devices per host scsi_debug will
respond to (i.e. 7 targets, each with 2 lus).

Documentation updated at:
http://www.torque.net/sg/sdebug25.html

drivers/scsi/scsi_debug.h

@@ -2,6 +2,7 @@
 
 #include <linux/types.h>
 
+static int scsi_debug_slave_alloc(struct scsi_device *);
 static int scsi_debug_slave_configure(struct scsi_device *);
 static void scsi_debug_slave_destroy(struct scsi_device *);
 static int scsi_debug_queuecommand(struct scsi_cmnd *, 
@@ -27,6 +28,7 @@ static Scsi_Host_Template sdebug_driver_template = {
 	.proc_info =		scsi_debug_proc_info,
 	.name =			"SCSI DEBUG",
 	.info =			scsi_debug_info,
+	.slave_alloc =		scsi_debug_slave_alloc,
 	.slave_configure =	scsi_debug_slave_configure,
 	.slave_destroy =	scsi_debug_slave_destroy,
 	.ioctl =		scsi_debug_ioctl,