1. static const struct file_operations fuse_file_operations = {
    2.     .llseek        = fuse_file_llseek,
    3.     .read_iter    = fuse_file_read_iter,
    4.     .write_iter    = fuse_file_write_iter,
    5.     .mmap        = fuse_file_mmap,
    6.     .open        = fuse_open,
    7.     .flush        = fuse_flush,
    8.     .release    = fuse_release,
    9.     .fsync        = fuse_fsync,
    10.     .lock        = fuse_file_lock,
    11.     .flock        = fuse_file_flock,
    12.     .splice_read    = generic_file_splice_read,
    13.     .unlocked_ioctl    = fuse_file_ioctl,
    14.     .compat_ioctl    = fuse_file_compat_ioctl,
    15.     .poll        = fuse_file_poll,
    16.     .fallocate    = fuse_file_fallocate,
    17. };
    2. static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr)
    3. {
    4.     inode->i_mode = attr->mode & S_IFMT;
    5.     inode->i_size = attr->size;
    6.     inode->i_mtime.tv_sec  = attr->mtime;
    7.     inode->i_mtime.tv_nsec = attr->mtimensec;
    8.     inode->i_ctime.tv_sec  = attr->ctime;
    9.     inode->i_ctime.tv_nsec = attr->ctimensec;
    10.     if (S_ISREG(inode->i_mode)) {
    11.         fuse_init_common(inode);
    12.         fuse_init_file_inode(inode);
    13.     } else if (S_ISDIR(inode->i_mode))
    14.         fuse_init_dir(inode);
    15.     else if (S_ISLNK(inode->i_mode))
    16.         fuse_init_symlink(inode);
    17.     else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
    18.          S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
    19.         fuse_init_common(inode);
    20.         init_special_inode(inode, inode->i_mode,
    21.                    new_decode_dev(attr->rdev));
    22.     } else
    23.         BUG();
    24. }

    USER Space

    static ssize_t fuse_dev_do_read(struct fuse_dev *fud, struct file *file, struct fuse_copy_state *cs, size_t nbytes)

    fuse_do_work