Ashish Gupta wrote:

>     When calling sys_open,it calls NDINIT with UIO_USERSPACE
> as one of the arguments.But as i am calling from KERNEL space
> should i have to change some fields of VM sturcts to have illusion 
> that call is made from USERSPACE and latter on restore the values.

As an example, you could look at the way sys_acct() opens the accounting
file in sys/kern/kern_acct.c.

Simon.