You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: mod.rs
    path of file: ./repos/catfs/src/catfs
    
    the code of the file until where you have to start completion: extern crate fuse;
extern crate libc;
extern crate threadpool;
extern crate time;

use self::fuse::{ReplyEntry, ReplyAttr, ReplyOpen, ReplyEmpty, ReplyDirectory, ReplyData,
                 ReplyWrite, ReplyCreate, ReplyStatfs};

use self::time::{Duration, Timespec};

use std::cmp;
use std::collections::HashMap;
use std::ffi::OsStr;
use std::ffi::OsString;
use std::os::unix::ffi::OsStrExt;
use std::os::unix::io::RawFd;
use std::sync::{Arc, Mutex, MutexGuard, RwLock, RwLockWriteGuard};
use std::path::{Path, PathBuf};

use self::threadpool::ThreadPool;

pub mod error;
pub mod file;
pub mod flags;
pub mod rlibc;
pub mod tests;

mod dir;
mod inode;
mod substr;

use self::inode::Inode;
use self::flags::DiskSpace;
use super::evicter::Evicter;

#[derive(Default)]
struct InodeStore {
    inodes: HashMap<u64, Arc<RwLock<Inode>>>,
    inodes_cache: HashMap<PathBuf, u64>,
}

impl InodeStore {
    fn get(&self, ino: u64) -> Arc<RwLock<Inode>> {
        return self.inodes.get(&ino).unwrap().clone();
    }

    fn get_mut_by_path(&mut self, path: &Path) -> Option<Arc<RwLock<Inode>>> {
        let ino: u64;

        if let Some(ino_ref) = self.inodes_cache.get(path) {
            ino = *ino_ref;
        } else {
            return None;
        }

        return Some(self.get(ino));
    }

    fn remove_ino(&mut self, ino: u64) {
        let inode = self.inodes.remove(&ino).unwrap();
        let inode = inode.read().unwrap();
        self.inodes_cache.remove(inode.get_path());
    }
}

struct HandleStore<T> {
    handles: HashMap<u64, T>,
 
    
    pub fn flush(&mut self, ino: u64, fh: u64, _lock_owner: u64, reply: ReplyEmpty) {
        let s = make_self(self);
        self.tp.lock().unwrap().execute(move || {
            let flushed_to_src: bool;
            let inode: Arc<RwLock<Inode>>;
            {
                // first flush locally
                let file: Arc<Mutex<file::Handle>>;
                {
                    let fh_store = s.fh_store.lock().unwrap();
                    file = fh_store.handles.get(&fh).unwrap().clone();
                    let store = s.store.lock().unwrap();
                    inode = store.get(ino);
                }

                let mut file = file.lock().unwrap();
                match file.flush() {
                    Ok(b) => flushed_to_src = b,
                    Err(e) => {
                        let mut inode = inode.write().unwrap();
                        inode.flush_failed();

                        error!("<-- !flush {:016x} = {}", fh, e);
                        reply.error(error::errno(&e));
                        return;
                    }
                }
            }

            if flushed_to_src {
                let mut inode = inode.write().unwrap();
                inode.flushed();

                // refresh attr with the original file so it will be consistent with lookup
                if let Err(e) = inode.refresh() {
                    error!("<-- !flush {:?} = {}", inode.get_path(), e);
                    reply.error(error::errno(&e));
                    return;
                }
                debug!("<-- flush {:?}", inode.get_path());
            } else {
                let mut inode = inode.write().unwrap();
                inode.flushed();
                debug!("<-- flush ino: {:016x} fh: {}", ino, fh);
            }

            reply.ok();
        });
    }