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authorMatthew Wilcox <matthew@wil.cx>2006-11-22 13:24:54 -0700
committerJames Bottomley <jejb@mulgrave.il.steeleye.com>2006-11-22 16:42:42 -0600
commit1aa8fab2acf1cb8b341131b726773fcff0abc707 (patch)
tree27590ddf03adce3b6244d60d4a818d9bdbbe85b0
parent93b45af5c6b9d41bbe9da11442291ac4eefc15b4 (diff)
[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>
-rw-r--r--drivers/scsi/scsi_scan.c27
-rw-r--r--include/scsi/scsi_host.h18
2 files changed, 38 insertions, 7 deletions
diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index 3ccaa4be92d..4d656148bd6 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -1642,7 +1642,7 @@ static void scsi_sysfs_add_devices(struct Scsi_Host *shost)
* that other asynchronous scans started after this one won't affect the
* ordering of the discovered devices.
*/
-struct async_scan_data *scsi_prep_async_scan(struct Scsi_Host *shost)
+static struct async_scan_data *scsi_prep_async_scan(struct Scsi_Host *shost)
{
struct async_scan_data *data;
@@ -1686,7 +1686,7 @@ struct async_scan_data *scsi_prep_async_scan(struct Scsi_Host *shost)
* This function announces all the devices it has found to the rest
* of the system.
*/
-void scsi_finish_async_scan(struct async_scan_data *data)
+static void scsi_finish_async_scan(struct async_scan_data *data)
{
struct Scsi_Host *shost;
@@ -1719,12 +1719,25 @@ void scsi_finish_async_scan(struct async_scan_data *data)
kfree(data);
}
-static int do_scan_async(void *_data)
+static void do_scsi_scan_host(struct Scsi_Host *shost)
{
- struct async_scan_data *data = _data;
- scsi_scan_host_selected(data->shost, SCAN_WILD_CARD, SCAN_WILD_CARD,
+ if (shost->hostt->scan_finished) {
+ unsigned long start = jiffies;
+ if (shost->hostt->scan_start)
+ shost->hostt->scan_start(shost);
+
+ while (!shost->hostt->scan_finished(shost, jiffies - start))
+ msleep(10);
+ } else {
+ scsi_scan_host_selected(shost, SCAN_WILD_CARD, SCAN_WILD_CARD,
SCAN_WILD_CARD, 0);
+ }
+}
+static int do_scan_async(void *_data)
+{
+ struct async_scan_data *data = _data;
+ do_scsi_scan_host(data->shost);
scsi_finish_async_scan(data);
return 0;
}
@@ -1742,10 +1755,10 @@ void scsi_scan_host(struct Scsi_Host *shost)
data = scsi_prep_async_scan(shost);
if (!data) {
- scsi_scan_host_selected(shost, SCAN_WILD_CARD, SCAN_WILD_CARD,
- SCAN_WILD_CARD, 0);
+ do_scsi_scan_host(shost);
return;
}
+
kthread_run(do_scan_async, data, "scsi_scan_%d", shost->host_no);
}
EXPORT_SYMBOL(scsi_scan_host);
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index e618e711ea5..6d8945d71c6 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -241,6 +241,24 @@ struct scsi_host_template {
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