Mmap kernel <-> userspace

[dasalam]

Hello, all. I have kernel module that using mmap to communicte with usepscae program. Full code of this module paste.org.ru/?ii68m5. Compiliting ok, but when i try to read data drom userspace program(full code of userspace program paste.org.ru/?drk1vp) i get error "invalid address"

...
struct page *mmap_nopage(struct vm_area_struct *vma, unsigned long address, int *type)
{
    struct page *page;
    struct mmap_info *info;
    /* is the address valid? */
    if (address > vma->vm_end) {
        printk("invalid address\n");
        return NULL;
    }
...

Please, help me to fix this mistake. Thank you

[rulingminds]

struct vm_operations_struct mmap_vm_ops = {
.open = mmap_open,
.close = mmap_close,
.fault = mmap_nopage,
};

Check the prototype of the fault. it is int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf);, I think you are referring to nopage method. But nopage method is not there in latest kernels.

[dasalam]

Thank you for answer. I tryed to use remap_pfn_range method. My code i borrowed it from LDD 3 (cs.fsu.edu/~baker/devices/lxr/http/source/ldd-examples/simple/simple.c) paste.org.ru/?5zs0xh . But i can't get data from kernel with userspace program.
PS. It's normal that vma->vm_pgoff << PAGE_SHIFT in mmap_open = 0 ?

PPS. I wrote working module using chrdev. Module code paste.org.ru/?d6jt5k. User space code paste.org.ru/?vtb1ki (/dev/simple char device created with "mknod /dev/simple c 241 0"). I understand how to read and write info from userspace, but i dont khow how do it from kernel space. Can anybody explain me?