From 135da0b037984c0284acdf40aaf4f7f31eb5cbd0 Mon Sep 17 00:00:00 2001 From: Christian Borntraeger Date: Wed, 23 Jan 2008 17:56:50 +0100 Subject: [PATCH] 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 Signed-off-by: Rusty Russell --- drivers/block/virtio_blk.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-) diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c index 6143337527e7..d2fe679519e4 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) -- 2.34.1