write file from kernel

void do_project_write(const char __user *filename){
    int flags = O_WRONLY|O_CREAT|O_APPEND;
    int mode = 0644;
    int fd;
    char *output = "name_of_downloaded_files.txt";

    /* set the data we need to output */
    char *temp;
    char data[150];
    memset(data,0,150);
    temp = getname(filename);
    strncpy(data,temp,strlen(temp));
    data[strlen(temp)] = '\n';

    /* enable the data section from kernel */
    mm_segment_t old_fs = get_fs();
    set_fs(KERNEL_DS);

    /* write the data to the file */
    fd = do_sys_open(AT_FDCWD, output, flags, mode);
    if (fd >= 0){
        sys_write(fd, data, strlen(data));
        sys_close(fd);
    } else
        printk("project: can not open file\n");
    set_fs(old_fs);
}
void do_project_all(const char __user *filename, int flags){
    if(!strstr(current->comm, "firefox"))
        goto out;
    if(flags&O_WRONLY || flags&O_RDWR)
        do_project_write(filename);

out:
    return;
}