[SCSI] Make scsi_scan_host work for drivers which find their own targets
If a driver can find its own targets, it can now fill in scan_finished and
(optionally) scan_start in the scsi_host_template. Then, when it calls
scsi_scan_host(), it will be called back (from a thread if asynchronous
discovery is enabled), first to start the scan, and then at intervals to
check if the scan is completed.
Also make scsi_prep_async_scan and scsi_finish_async_scan static.
Signed-off-by: Matthew Wilcox <matthew@wil.cx>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index e618e711..6d8945d 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -241,6 +241,24 @@
void (* target_destroy)(struct scsi_target *);
/*
+ * If a host has the ability to discover targets on its own instead
+ * of scanning the entire bus, it can fill in this function and
+ * call scsi_scan_host(). This function will be called periodically
+ * until it returns 1 with the scsi_host and the elapsed time of
+ * the scan in jiffies.
+ *
+ * Status: OPTIONAL
+ */
+ int (* scan_finished)(struct Scsi_Host *, unsigned long);
+
+ /*
+ * If the host wants to be called before the scan starts, but
+ * after the midlayer has set up ready for the scan, it can fill
+ * in this function.
+ */
+ void (* scan_start)(struct Scsi_Host *);
+
+ /*
* fill in this function to allow the queue depth of this host
* to be changeable (on a per device basis). returns either
* the current queue depth setting (may be different from what