[SCSI] osd_uld: OSD scsi ULD

Add a Linux driver module that registers as a SCSI ULD and probes
for OSD type SCSI devices.

When an OSD-type SCSI device is found a character device is created
in the form of /dev/osdX - where X goes from 0 up to hard coded 64.
The Major character device number used is 260.
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Reviewed-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

drivers/scsi/osd/Kbuild

@@ -17,6 +17,9 @@ ifneq ($(OSD_INC),)
 CONFIG_SCSI_OSD_INITIATOR=m
 ccflags-y += -DCONFIG_SCSI_OSD_INITIATOR -DCONFIG_SCSI_OSD_INITIATOR_MODULE
 
+CONFIG_SCSI_OSD_ULD=m
+ccflags-y += -DCONFIG_SCSI_OSD_ULD -DCONFIG_SCSI_OSD_ULD_MODULE
+
 # Uncomment to turn debug on
 # ccflags-y += -DCONFIG_SCSI_OSD_DEBUG
 
@@ -30,3 +33,7 @@ endif
 # libosd.ko - osd-initiator library
 libosd-y := osd_initiator.o
 obj-$(CONFIG_SCSI_OSD_INITIATOR) += libosd.o
+
+# osd.ko - SCSI ULD and char-device
+osd-y := osd_uld.o
+obj-$(CONFIG_SCSI_OSD_ULD) += osd.o

include/scsi/osd_initiator.h

@@ -33,6 +33,12 @@ struct osd_dev {
 	unsigned def_timeout;
 };
 
+/* Add/remove test ioctls from external modules */
+typedef int (do_test_fn)(struct osd_dev *od, unsigned cmd, unsigned long arg);
+int osduld_register_test(unsigned ioctl, do_test_fn *do_test);
+void osduld_unregister_test(unsigned ioctl);
+
+/* These are called by uld at probe time */
 void osd_dev_init(struct osd_dev *od, struct scsi_device *scsi_device);
 void osd_dev_fini(struct osd_dev *od);