How to get the disk size

Hi, everyone, does anyone know how to get the size of the disk, say hard disk? In the Writing Device Driver it says that the block device driver must create an 'nblocks' property for each minor block device. I want to get the size of the block device in another driver. Is there any DDI/DKI kernel function for this?
How to get the same thing in a user mode application? Is there any API to do this?
Thank you very much.

I just found a function in include/sys/conf.h. The prototype is:
extern int bdev_size(dev_t);
Can I use this function to get the disk size of the device dev_t? I couldn't find the documentation of this function.
Thanks

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pstein wrote:
...The following code does not work. Work?! It does not even compile! Please consider posting code in the form of an SSCCE in future.
Here is an SSCCE.
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