1 files changed, 30 insertions, 0 deletions

diff --git a/drivers/s390/block/dasd_devmap.c b/drivers/s390/block/dasd_devmap.c
index 42e1bf35f689..d71511c7850a 100644
--- a/drivers/s390/block/dasd_devmap.c
+++ b/drivers/s390/block/dasd_devmap.c
@@ -674,6 +674,36 @@ dasd_device_from_cdev(struct ccw_device *cdev)
         return device;
 }
 
+void dasd_add_link_to_gendisk(struct gendisk *gdp, struct dasd_device *device)
+{
+        struct dasd_devmap *devmap;
+
+        devmap = dasd_find_busid(dev_name(&device->cdev->dev));
+        if (IS_ERR(devmap))
+                return;
+        spin_lock(&dasd_devmap_lock);
+        gdp->private_data = devmap;
+        spin_unlock(&dasd_devmap_lock);
+}
+
+struct dasd_device *dasd_device_from_gendisk(struct gendisk *gdp)
+{
+        struct dasd_device *device;
+        struct dasd_devmap *devmap;
+
+        if (!gdp->private_data)
+                return NULL;
+        device = NULL;
+        spin_lock(&dasd_devmap_lock);
+        devmap = gdp->private_data;
+        if (devmap && devmap->device) {
+                device = devmap->device;
+                dasd_get_device(device);
+        }
+        spin_unlock(&dasd_devmap_lock);
+        return device;
+}
+
 /*
  * SECTION: files in sysfs
  */