diff options
| author | Christian Borntraeger <borntraeger@de.ibm.com> | 2008-01-23 17:56:50 +0100 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2008-02-04 23:50:09 +1100 |
| commit | 135da0b037984c0284acdf40aaf4f7f31eb5cbd0 (patch) | |
| tree | 733f368d62f5e1367550380d50c2e6d98e498660 /drivers/block | |
| parent | 6c0cd7c000dc0851035c5003bf9d47733d0b257b (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>
Diffstat (limited to 'drivers/block')
| -rw-r--r-- | drivers/block/virtio_blk.c | 15 |
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) |