void get_cwd(char* buf)
{
    char *result;

  current->fs->pwd;
    result = get_dentry_path(current->fs->pwd);

    memcpy(buf, result, strlen(result)+1);

    kfree(result);
}

error: dereferencing pointer to incomplete type

The error points to current->fs->pwd;

includes:

#include <asm/stat.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/dirent.h>
#include <linux/sched.h>
#include <asm/uaccess.h>
#include <asm/current.h>
#include <linux/path.h>

If I type current->fs; on 5th line gcc don't give error on this line. The problem is with pwd field.