*Fetch device from local device.

*Allocate space for buffer,pointed to by dev->data.

*Check for error ,clear the allocated space using memset.

*Check if the fpos is beyond the device size.

*Check for errors.

*Check if the sufficient amount of space is available to write the count no of bytes.

** if not modify the count accordingly.

*Copy from user.

*Modify the file position.

*Identify the no. of bytes yet to be written.

*Modify the device data size.

*Return space for buffer,pointed to by dev->data.