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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>
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1 changed files with 13 additions and 2 deletions
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@ -152,9 +152,20 @@ static int virtblk_ioctl(struct inode *inode, struct file *filp,
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(void __user *)data);
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}
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/* We provide getgeo only to please some old bootloader/partitioning tools */
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static int virtblk_getgeo(struct block_device *bd, struct hd_geometry *geo)
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{
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/* some standard values, similar to sd */
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geo->heads = 1 << 6;
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geo->sectors = 1 << 5;
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geo->cylinders = get_capacity(bd->bd_disk) >> 11;
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return 0;
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}
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static struct block_device_operations virtblk_fops = {
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.ioctl = virtblk_ioctl,
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.owner = THIS_MODULE,
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.ioctl = virtblk_ioctl,
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.owner = THIS_MODULE,
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.getgeo = virtblk_getgeo,
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};
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static int virtblk_probe(struct virtio_device *vdev)
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