Assigning '*wdata' with a dynamic initializer creates a
temporary structure copy on the stack, and then the final
data is initialized with a "memcpy()".

As a result, these NFS functions use more than 800 bytes
of stack-space.

Changing the code to just do a memset followed by explicit
initialization of the non-zero member variables takes the
stack usage down to 36 bytes. 

Here is a patch that does exactly that.