How to get the size of the block device ???? (Important)

[Sanjay Kumar]

Hi,
  I am Sanjay Kumar and wants to write my own file
system on Linux. I have almost written the code.
  But,now i have a problem while writing the code 
for "mkfs" for my filesystem.

Problem Summary : I need the size of the block device
in bytes on which my file system will be created.
Actually, there is a feild in the super block, needs
the total no of blocks on the device while while
creating the filesystem. So, Can you Plz. help me out
of this problem.

I got your email id from :

 http://lwn.net/2001/0906/a/last-sector.php3

Sanjay Kumar.
M.C.A.,
Univeristy of Pune,
India.

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