Commit 135da0b0 authored Jan 23, 2008 by Christian Borntraeger Committed by Rusty Russell Feb 04, 2008

virtio_blk: provide getgeo



Rusty,

I currently try to make my guest boot from an virtio root device
without having an external kernel. Some of the tools that I tried
expect HDIO_GETGEO to work. The most interesting value is likely
the geo.start value to get the offset of a partition. This value
is filled by block/ioctl.c if fops->getgeo is set. This patch also
fills in some standard values for heads, sectors and cylinders.

Makes sense?

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

parent 6c0cd7c0

drivers/block/virtio_blk.c

+13 −2

Original line number	Diff line number	Diff line
		@@ -152,9 +152,20 @@ static int virtblk_ioctl(struct inode inode, struct file filp,
		(void __user *)data);
		}

		/* We provide getgeo only to please some old bootloader/partitioning tools */
		static int virtblk_getgeo(struct block_device bd, struct hd_geometry geo)
		{
		/* some standard values, similar to sd */
		geo->heads = 1 << 6;
		geo->sectors = 1 << 5;
		geo->cylinders = get_capacity(bd->bd_disk) >> 11;
		return 0;
		}

		static struct block_device_operations virtblk_fops = {
		.ioctl = virtblk_ioctl,
		.owner = THIS_MODULE,
		.getgeo = virtblk_getgeo,
		};

		static int virtblk_probe(struct virtio_device *vdev)