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-rw-r--r--block/ioctl.c22
1 files changed, 22 insertions, 0 deletions
diff --git a/block/ioctl.c b/block/ioctl.c
index 6e278474f9a..82030e1dfd6 100644
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -1,6 +1,7 @@
#include <linux/sched.h> /* for capable() */
#include <linux/blkdev.h>
#include <linux/blkpg.h>
+#include <linux/hdreg.h>
#include <linux/backing-dev.h>
#include <linux/buffer_head.h>
#include <linux/smp_lock.h>
@@ -245,6 +246,27 @@ int blkdev_ioctl(struct inode *inode, struct file *file, unsigned cmd,
set_device_ro(bdev, n);
unlock_kernel();
return 0;
+ case HDIO_GETGEO: {
+ struct hd_geometry geo;
+
+ if (!arg)
+ return -EINVAL;
+ if (!disk->fops->getgeo)
+ return -ENOTTY;
+
+ /*
+ * We need to set the startsect first, the driver may
+ * want to override it.
+ */
+ geo.start = get_start_sect(bdev);
+ ret = disk->fops->getgeo(bdev, &geo);
+ if (ret)
+ return ret;
+ if (copy_to_user((struct hd_geometry __user *)arg, &geo,
+ sizeof(geo)))
+ return -EFAULT;
+ return 0;
+ }
}
lock_kernel();