[PATCH] Add block_device_operations.getgeo block device method

[mirror_ubuntu-zesty-kernel.git] / drivers / s390 / block / dasd.c

diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index f779f674dfa0414b498f1cf0be497e4a87a89291..2472fa1a1be14c72a6e324ec28e42070ea4fb253 100644 (file)
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -18,6 +18,7 @@
 #include <linux/major.h>
 #include <linux/slab.h>
 #include <linux/buffer_head.h>
+#include <linux/hdreg.h>
 
 #include <asm/ccwdev.h>
 #include <asm/ebcdic.h>
@@ -1723,12 +1724,34 @@ dasd_release(struct inode *inp, struct file *filp)
        return 0;
 }
 
+/*
+ * Return disk geometry.
+ */
+static int
+dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
+{
+       struct dasd_device *device;
+
+       device = bdev->bd_disk->private_data;
+       if (!device)
+               return -ENODEV;
+
+       if (!device->discipline ||
+           !device->discipline->fill_geometry)
+               return -EINVAL;
+
+       device->discipline->fill_geometry(device, geo);
+       geo->start = get_start_sect(bdev) >> device->s2b_shift;
+       return 0;
+}
+
 struct block_device_operations
 dasd_device_operations = {
        .owner          = THIS_MODULE,
        .open           = dasd_open,
        .release        = dasd_release,
        .ioctl          = dasd_ioctl,
+       .getgeo         = dasd_getgeo,
 };