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authorChristian Borntraeger <borntraeger@de.ibm.com>2008-01-23 17:56:50 +0100
committerRusty Russell <rusty@rustcorp.com.au>2008-02-04 23:50:09 +1100
commit135da0b037984c0284acdf40aaf4f7f31eb5cbd0 (patch)
tree733f368d62f5e1367550380d50c2e6d98e498660
parent6c0cd7c000dc0851035c5003bf9d47733d0b257b (diff)
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>
-rw-r--r--drivers/block/virtio_blk.c15
1 files changed, 13 insertions, 2 deletions
diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index 6143337527e..d2fe679519e 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -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,
+ .ioctl = virtblk_ioctl,
+ .owner = THIS_MODULE,
+ .getgeo = virtblk_getgeo,
};
static int virtblk_probe(struct virtio_device *vdev)