proc-fs - single call back function for several files

Question

I have some problems with proc-filesystem.
Before Kernel 3.10 the proc-fs read and write functions had an argument void *data which allowed to use a single call back function for several files. In the read and write functions from struct file_operations such argument is missing and I have no idea how to solve.

Answer 1

works fine with proc_create_data and PDE_DATA(file_inode(filp)) macro