Refactor workspace

5 files changed, 0 insertions, 684 deletions

diff --git a/ayafs/src/memory/cached_block.rs b/ayafs/src/memory/cached_block.rs
deleted file mode 100644
index c3d0338..0000000
--- a/ayafs/src/memory/cached_block.rs
+++ /dev/null
@@ -1,180 +0,0 @@
-use crate::block_device::{BlockDevice, BLOCK_SIZE};
-use crate::disk::block::Block;
-use crate::AyaFS;
-use lru::LruCache;
-use std::num::NonZeroUsize;
-use std::sync::Arc;
-
-#[derive(Clone)]
-pub struct CachedBlock<T: Block> {
-    pub block: T,
-    pub index: usize,
-    pub dirty: bool,
-}
-
-pub fn convert_mut<U: Block, T: Block>(input_block: &mut CachedBlock<U>) -> &mut CachedBlock<T> {
-    let ptr = input_block as *const CachedBlock<U> as *mut u8;
-    let block = ptr.cast::<CachedBlock<T>>();
-    unsafe { &mut *block }
-}
-
-pub fn convert<U: Block, T: Block>(input_block: &CachedBlock<U>) -> &CachedBlock<T> {
-    let ptr = input_block as *const CachedBlock<U> as *mut u8;
-    let block = ptr.cast::<CachedBlock<T>>();
-    unsafe { &*block }
-}
-
-pub(crate) struct BlockCache<T: Block> {
-    device: Arc<dyn BlockDevice>,
-    cache: LruCache<usize, CachedBlock<T>>,
-}
-
-impl<T: Block> BlockCache<T> {
-    pub(crate) fn new(device: Arc<dyn BlockDevice>, cache_size: usize) -> Self {
-        Self {
-            device,
-            cache: LruCache::new(NonZeroUsize::new(cache_size).unwrap()),
-        }
-    }
-
-    pub(crate) fn load_block(&mut self, index: usize) -> bool {
-        if self.cache.contains(&index) == false {
-            let mut buffer = [0u8; BLOCK_SIZE];
-            self.device.read(index, &mut buffer);
-            let block: T = unsafe { std::mem::transmute_copy(&buffer) };
-            let cached_block = CachedBlock {
-                block,
-                index,
-                dirty: false,
-            };
-            if let Some((old_index, old_block)) = self.cache.push(index, cached_block) {
-                assert_ne!(old_index, index); // 只有 block 不在 cache 里的时候才会插入
-                if old_block.dirty {
-                    let old_block_ptr = &old_block.block as *const T as *mut u8;
-                    let old_block_buffer =
-                        unsafe { std::slice::from_raw_parts(old_block_ptr, BLOCK_SIZE) };
-                    self.device.write(old_index, old_block_buffer);
-                }
-            }
-        }
-        true
-    }
-
-    /// 从 LRU cache 里获取一个 block 的引用, 如果没有在 cache 中会加载.
-    /// 这个函数不应该返回 None
-    pub(crate) fn get_block<U: Block>(&mut self, index: usize) -> Option<&CachedBlock<U>> {
-        if !self.cache.contains(&index) {
-            self.load_block(index);
-        }
-        self.cache.get(&index).map(convert::<T, U>)
-    }
-
-    /// 从 LRU cache 里获取一个 block 的可变引用, 如果没有在 cache 中会加载.
-    /// 这个函数不应该返回 None
-    pub(crate) fn get_block_mut<U: Block>(&mut self, index: usize) -> Option<&mut CachedBlock<U>> {
-        if !self.cache.contains(&index) {
-            self.load_block(index);
-        }
-        self.cache.get_mut(&index).map(|block| {
-            block.dirty = true;
-            convert_mut::<T, U>(block)
-        })
-    }
-
-    /// 向 LRU cache 中插入一个全新初始化的 block
-    /// 这个 block 全 0, 而且是 dirty 的, 即使被挤出去也会触发一次落盘
-    pub(crate) fn init_block(&mut self, index: usize) {
-        let allocated_block = CachedBlock {
-            block: T::default(),
-            index,
-            dirty: true,
-        };
-        if let Some((old_index, old_block)) = self.cache.push(index, allocated_block) {
-            if old_block.dirty {
-                let old_block_ptr = &old_block.block as *const T as *mut u8;
-                let old_block_buffer =
-                    unsafe { std::slice::from_raw_parts(old_block_ptr, BLOCK_SIZE) };
-                self.device.write(old_index, old_block_buffer);
-            }
-        }
-    }
-
-    #[allow(unused)]
-    /// 从 LRU cache 中读取一个 block 的引用, *不会* 影响 LRU cache 的结构, 如果没有在 cache 中不会加载.
-    pub(crate) fn peek_block<U: Block>(&self, index: usize) -> Option<&CachedBlock<U>> {
-        self.cache.peek(&index).map(convert::<T, U>)
-    }
-
-    #[allow(unused)]
-    /// 从 LRU cache 中读取一个 block 的可变引用, *不会* 影响 LRU cache 的结构, 如果没有在 cache 中不会加载.
-    pub(crate) fn peek_block_mut<U: Block>(&mut self, index: usize) -> Option<&mut CachedBlock<U>> {
-        self.cache.peek_mut(&index).map(convert_mut::<T, U>)
-    }
-
-    pub(crate) fn update_block<U: Block>(&mut self, block: CachedBlock<U>) -> bool {
-        if self.cache.contains(&block.index) {
-            let mut data_block = convert::<U, T>(&block).clone();
-            data_block.dirty = true; // TODO 需要把显式写回的都标记为 dirty 吗
-            self.cache.push(block.index, data_block);
-            true
-        } else {
-            false
-        }
-    }
-
-    fn pop(&mut self, entry: &usize) -> Option<CachedBlock<T>> {
-        self.cache.pop(entry)
-    }
-}
-
-impl AyaFS {
-    pub(crate) fn init_block(&mut self, index: usize) {
-        self.cached_blocks.init_block(index);
-    }
-
-    pub(crate) fn get_block<T: Block>(&mut self, index: usize) -> Option<&CachedBlock<T>> {
-        if self.data_bitmap.query(index) {
-            Some(self.cached_blocks.get_block::<T>(index).unwrap())
-        } else {
-            self.cached_blocks.pop(&index);
-            None
-        }
-        // self.data_bitmap
-        //     .query(index)
-        //     .then(|| self.cached_blocks.get_block::<T>(index).unwrap())
-        // 返回 None 当且仅当 data_bitmap 中这个 block 为 invalid
-    }
-
-    pub(crate) fn get_block_mut<T: Block>(&mut self, index: usize) -> Option<&mut CachedBlock<T>> {
-        if self.data_bitmap.query(index) {
-            Some(self.cached_blocks.get_block_mut::<T>(index).unwrap())
-        } else {
-            self.cached_blocks.pop(&index);
-            None
-        }
-        // self.data_bitmap
-        //     .query(index)
-        //     .then(|| self.cached_blocks.get_block_mut::<T>(index).unwrap())
-        // 返回 None 当且仅当 data_bitmap 中这个 block 为 invalid
-    }
-
-    #[allow(unused)]
-    pub(crate) fn peek_block<T: Block>(&self, index: usize) -> Option<&CachedBlock<T>> {
-        self.data_bitmap
-            .query(index)
-            .then(|| self.cached_blocks.peek_block::<T>(index).unwrap())
-        // 返回 None 当且仅当 data_bitmap 中这个 block 为 invalid
-    }
-
-    #[allow(unused)]
-    pub(crate) fn peek_block_mut<T: Block>(&mut self, index: usize) -> Option<&mut CachedBlock<T>> {
-        self.data_bitmap
-            .query(index)
-            .then(|| self.cached_blocks.peek_block_mut::<T>(index).unwrap())
-        // 返回 None 当且仅当 data_bitmap 中这个 block 为 invalid
-    }
-
-    pub(crate) fn update_block<T: Block>(&mut self, block: CachedBlock<T>) -> bool {
-        self.cached_blocks.update_block(block)
-    }
-}
diff --git a/ayafs/src/memory/cached_inode.rs b/ayafs/src/memory/cached_inode.rs
deleted file mode 100644
index 2f26dde..0000000
--- a/ayafs/src/memory/cached_inode.rs
+++ /dev/null
@@ -1,178 +0,0 @@
-use crate::disk::block::InodeBlock;
-use crate::disk::inode::{Inode, INODE_SIZE};
-use crate::{utils, AyaFS};
-use and_then_some::BoolExt;
-use fuser::FileType;
-use libc::{c_int, EIO, EISDIR, ENOENT, ENOTDIR, ENOTEMPTY};
-
-impl AyaFS {
-    pub(crate) fn create_file(
-        &mut self,
-        permissions: u16,
-        uid: u32,
-        gid: u32,
-        flags: u32,
-    ) -> Option<(usize, &Inode)> {
-        self.inode_bitmap.allocate().map(|inode_index| {
-            self.get_inode_mut(inode_index).map(|inode| {
-                *inode = Inode::file(permissions, uid, gid, utils::time_now(), flags, 0, 0, 0);
-            });
-            (inode_index, self.get_inode(inode_index).unwrap())
-        })
-    }
-
-    pub(crate) fn create_symlink(
-        &mut self,
-        permissions: u16,
-        uid: u32,
-        gid: u32,
-        flags: u32,
-    ) -> Option<(usize, &Inode)> {
-        self.inode_bitmap.allocate().map(|inode_index| {
-            self.get_inode_mut(inode_index).map(|inode| {
-                *inode = Inode::symlink(permissions, uid, gid, utils::time_now(), flags, 0, 0, 0);
-            });
-            (inode_index, self.get_inode(inode_index).unwrap())
-        })
-    }
-
-    /// 根目录的 parent_inode_number 传入 None, 会直接以自己作为 .. 的 inode number
-    pub(crate) fn create_directory(
-        &mut self,
-        permissions: u16,
-        uid: u32,
-        gid: u32,
-        flags: u32,
-        parent_inode_number: Option<usize>,
-    ) -> Option<(usize, &Inode)> {
-        self.inode_bitmap.allocate().map(|inode_index| {
-            // 创建 Inode
-            let mut new_inode =
-                Inode::directory(permissions, uid, gid, utils::time_now(), flags, 0, 0, 0);
-            self.init_direntry_map(inode_index);
-            self.add_direntry(inode_index, &mut new_inode, inode_index, ".", 0x2)
-                .unwrap();
-            self.add_direntry(
-                inode_index,
-                &mut new_inode,
-                parent_inode_number.unwrap_or(inode_index),
-                "..",
-                0x2,
-            )
-            .unwrap();
-            // 把 inode 放到指定位置
-            self.get_inode_mut(inode_index).map(|inode| {
-                *inode = new_inode;
-            });
-
-            (inode_index, self.get_inode(inode_index).unwrap())
-        })
-    }
-
-    pub(crate) fn remove_file(&mut self, inode_index: usize) -> Result<bool, c_int> {
-        if self.inode_bitmap.query(inode_index) {
-            let (block_index, offset) = self.locate_inode(inode_index);
-            if let Some(cached_block) = self.cached_inodes.get_block::<InodeBlock>(block_index) {
-                let inode = cached_block.block.inodes[offset / INODE_SIZE].clone();
-                match inode.file_type() {
-                    FileType::RegularFile => self.deallocate_all_blocks_for(&inode).unwrap(),
-                    FileType::Symlink => {
-                        if inode.size >= 60 {
-                            self.deallocate_all_blocks_for(&inode).unwrap();
-                        }
-                    }
-                    FileType::Directory => return Err(EISDIR),
-                    _ => return Err(EIO),
-                }
-            }
-            self.inode_bitmap.deallocate(inode_index);
-            Ok(true)
-        } else {
-            Err(ENOENT)
-        }
-    }
-
-    // 要删除的 inode 一定得是空的
-    pub(crate) fn remove_dir(&mut self, inode_index: usize) -> Result<bool, c_int> {
-        if self.inode_bitmap.query(inode_index) {
-            let (block_index, offset) = self.locate_inode(inode_index);
-            if let Some(cached_block) = self.cached_inodes.get_block::<InodeBlock>(block_index) {
-                let inode = &cached_block.block.inodes[offset / INODE_SIZE].clone();
-                if !inode.is_dir() {
-                    // 不是 dir -> ENOTDIR
-                    return Err(ENOTDIR);
-                }
-                if inode.size > 2 {
-                    // 有 . 和 .. 以外的 entry -> ENOTEMPTY
-                    return Err(ENOTEMPTY);
-                }
-                // 销毁 inode 里的所有 block
-                self.deallocate_all_blocks_for(inode).unwrap();
-            }
-            // 销毁 inode
-            self.inode_bitmap.deallocate(inode_index);
-            Ok(true)
-        } else {
-            Err(ENOENT)
-        }
-    }
-
-    pub(crate) fn update_inode(&mut self, inode_index: usize, inode: Inode) -> bool {
-        if self.inode_bitmap.query(inode_index) {
-            let (block_index, offset) = self.locate_inode(inode_index);
-            if let Some(cached_block) = self.cached_inodes.get_block_mut::<InodeBlock>(block_index)
-            {
-                cached_block.block.inodes[offset / INODE_SIZE] = inode;
-            }
-            true
-        } else {
-            false
-        }
-    }
-
-    pub(crate) fn get_inode(&mut self, inode_index: usize) -> Option<&Inode> {
-        self.inode_bitmap.query(inode_index).and_then(|| {
-            let (block_index, offset) = self.locate_inode(inode_index);
-            // debug!("get_inode(inode_index: {}) -> block_index: {}, offset: {}", inode_index, block_index, offset);
-            self.cached_inodes
-                .get_block::<InodeBlock>(block_index)
-                .map(|cached_block| &cached_block.block.inodes[offset / INODE_SIZE])
-        })
-    }
-
-    pub(crate) fn get_inode_mut(&mut self, inode_index: usize) -> Option<&mut Inode> {
-        self.inode_bitmap.query(inode_index).and_then(|| {
-            let (block_index, offset) = self.locate_inode(inode_index);
-            // debug!("get_inode_mut(inode_index: {}) -> block_index: {}, offset: {}", inode_index, block_index, offset);
-            self.cached_inodes
-                .get_block_mut::<InodeBlock>(block_index)
-                .map(|cached_block| {
-                    cached_block.dirty = true; // 保守一些, 只要返回了 &mut Inode 这个页一定标记为脏
-                    &mut cached_block.block.inodes[offset / INODE_SIZE]
-                })
-        })
-    }
-
-    #[allow(unused)]
-    pub(crate) fn peek_inode(&self, inode_index: usize) -> Option<&Inode> {
-        self.inode_bitmap.query(inode_index).and_then(|| {
-            let (block_index, offset) = self.locate_inode(inode_index);
-            self.cached_inodes
-                .peek_block::<InodeBlock>(block_index)
-                .map(|cached_block| &cached_block.block.inodes[offset / INODE_SIZE])
-        })
-    }
-
-    #[allow(unused)]
-    pub(crate) fn peek_inode_mut(&mut self, inode_index: usize) -> Option<&mut Inode> {
-        self.inode_bitmap.query(inode_index).and_then(|| {
-            let (block_index, offset) = self.locate_inode(inode_index);
-            self.cached_inodes
-                .peek_block_mut::<InodeBlock>(block_index)
-                .map(|cached_block| {
-                    cached_block.dirty = true; // 保守一些, 只要返回了 &mut Inode 这个页一定标记为脏
-                    &mut cached_block.block.inodes[offset / INODE_SIZE]
-                })
-        })
-    }
-}
diff --git a/ayafs/src/memory/dir_entry.rs b/ayafs/src/memory/dir_entry.rs
deleted file mode 100644
index c013e1e..0000000
--- a/ayafs/src/memory/dir_entry.rs
+++ /dev/null
@@ -1,305 +0,0 @@
-use crate::disk::block::{DirectoryBlock, DirectoryEntry};
-use crate::disk::inode::Inode;
-use crate::AyaFS;
-use indexmap::IndexMap;
-use libc::{c_int, ENOENT, ENOSPC};
-use log::debug;
-use std::ffi::{OsStr, OsString};
-use std::os::unix::ffi::OsStrExt;
-use indexmap::map::Entry::Occupied;
-
-impl AyaFS {
-    pub(crate) fn init_direntry_map(&mut self, index: usize) {
-        let direntry_map: IndexMap<OsString, DirectoryEntry> = IndexMap::new();
-        if let Some((old_inode_index, old_dir_entry_map)) =
-            self.dir_entry_map.push(index, direntry_map)
-        {
-            if let Some(old_inode) = self.get_inode(old_inode_index) {
-                let mut old_inode = old_inode.clone();
-                self.write_back_direntry(old_inode_index, &mut old_inode, old_dir_entry_map)
-                    .unwrap();
-                self.update_inode(old_inode_index, old_inode);
-            }
-        }
-    }
-
-    pub(crate) fn load_direntry_map(&mut self, index: usize, inode: &Inode) -> Result<(), c_int> {
-        if self.dir_entry_map.contains(&index) {
-            debug!("load_direntry_map(ino: {}) already in cache", index);
-            return Ok(());
-        }
-
-        debug!("load_direntry_map(ino: {}) loading", index);
-        let mut dir_entry_map: IndexMap<OsString, DirectoryEntry> = IndexMap::new();
-        let mut entry_index: usize = 0;
-        loop {
-            let block_index_within_inode = entry_index / 15;
-            let entry_index_within_block = entry_index % 15;
-
-            match self.access_block::<DirectoryBlock>(inode, block_index_within_inode) {
-                Some(directory_block) => {
-                    if directory_block.block.query(entry_index_within_block) {
-                        let dir_entry = &directory_block.block.entries[entry_index_within_block];
-                        let name = dir_entry.name();
-                        dir_entry_map.insert(name, dir_entry.clone());
-                    } else {
-                        break;
-                    }
-                }
-                None => break,
-            }
-            entry_index += 1;
-        }
-
-        if let Some((old_inode_index, old_dir_entry_map)) =
-            self.dir_entry_map.push(index, dir_entry_map)
-        {
-            if let Some(old_inode) = self.get_inode(old_inode_index) {
-                let mut old_inode = old_inode.clone();
-                self.write_back_direntry(old_inode_index, &mut old_inode, old_dir_entry_map)?;
-                self.update_inode(old_inode_index, old_inode);
-            }
-        }
-
-        Ok(())
-    }
-
-    pub(crate) fn write_back_direntry(
-        &mut self,
-        _parent_index: usize,
-        parent_inode: &mut Inode,
-        dir_entry_map: IndexMap<OsString, DirectoryEntry>,
-    ) -> Result<(), c_int> {
-        for (entry_index, (_, dir_entry)) in dir_entry_map.into_iter().enumerate() {
-            let block_index_within_inode = entry_index / 15;
-            let entry_index_within_block = entry_index % 15;
-            // 不够就新分配
-            if self
-                .get_block_index(parent_inode, block_index_within_inode)
-                .is_none()
-            {
-                match self.allocate_block_for(parent_inode) {
-                    Some((_, block_index_within)) => {
-                        assert_eq!(block_index_within, block_index_within_inode);
-                    }
-                    None => {
-                        return Err(ENOSPC);
-                    }
-                }
-            }
-            match self.access_block_mut::<DirectoryBlock>(parent_inode, block_index_within_inode) {
-                Some(directory_block) => {
-                    directory_block.block.allocate(entry_index_within_block);
-                    directory_block.block.entries[entry_index_within_block] = dir_entry;
-                }
-                None => {
-                    return Err(ENOENT);
-                }
-            }
-        }
-        Ok(())
-    }
-
-    pub(crate) fn exchange_direntry<T: AsRef<OsStr>>(
-        &mut self,
-        parent_index: usize,
-        parent_inode: &mut Inode,
-        name: T,
-        new_parent_index: usize,
-        new_parent_inode: &mut Inode,
-        new_name: T,
-    ) -> Result<(), c_int> {
-        self.load_direntry_map(parent_index, parent_inode)?;
-        self.load_direntry_map(new_parent_index, new_parent_inode)?;
-
-        let dir_entry = self.dir_entry_map
-            .get(&parent_index)
-            .ok_or(ENOENT)?
-            .get(name.as_ref())
-            .cloned()
-            .ok_or(ENOENT)?;
-        let new_dir_entry = self.dir_entry_map
-            .get(&new_parent_index)
-            .ok_or(ENOENT)?
-            .get(new_name.as_ref())
-            .cloned()
-            .ok_or(ENOENT)?;
-
-        let name: &OsStr = name.as_ref();
-        let new_name: &OsStr = new_name.as_ref();
-
-        self.dir_entry_map
-            .get_mut(&parent_index)
-            .map(|dir_entry_map| {
-                if let Occupied(mut entry) = dir_entry_map.entry(name.to_os_string()) {
-                    *entry.get_mut() = new_dir_entry.clone();
-                }
-            })
-            .ok_or(ENOENT)?;
-        self.dir_entry_map
-            .get_mut(&new_parent_index)
-            .map(|new_dir_entry_map| {
-                if let Occupied(mut entry) = new_dir_entry_map.entry(new_name.to_os_string()) {
-                    *entry.get_mut() = dir_entry.clone();
-                }
-            })
-            .ok_or(ENOENT)?;
-
-        Ok(())
-    }
-
-    /// 删除第 entry_index 个 dir entry
-    pub(crate) fn remove_direntry<T: AsRef<OsStr>>(
-        &mut self,
-        parent_index: usize,
-        parent_inode: &mut Inode,
-        name: T,
-        _entry_index: u32,
-    ) -> Result<(), c_int> {
-        self.load_direntry_map(parent_index, parent_inode)?;
-        if let Some(dir_entry_map) = self.dir_entry_map.get_mut(&parent_index) {
-            debug!("  remove_direntry(ino: {}) using hashmap", parent_index);
-            if dir_entry_map.shift_remove(name.as_ref()).is_some() {
-                Ok(())
-            } else {
-                Err(ENOENT)
-            }
-        } else {
-            Err(ENOENT)
-        }
-    }
-
-    pub(crate) fn add_direntry_2<T: AsRef<OsStr>>(
-        &mut self,
-        parent_index: usize,
-        parent_inode: &mut Inode,
-        child_inode_name: T,
-        dir_entry: DirectoryEntry,
-    ) -> Result<u32, c_int> {
-        let child_inode_name = child_inode_name.as_ref();
-        self.load_direntry_map(parent_index, parent_inode)?;
-        if let Some(dir_entry_map) = self.dir_entry_map.get_mut(&parent_index) {
-            let (entry_index, _) =
-                dir_entry_map.insert_full(child_inode_name.to_os_string(), dir_entry);
-            debug!(
-                "  add_direntry(ino: {}) using hashmap, entry {}",
-                parent_index, entry_index
-            );
-            parent_inode.size += 1;
-            Ok(entry_index as u32)
-        } else {
-            Err(ENOENT)
-        }
-    }
-
-    pub(crate) fn add_direntry<T: AsRef<OsStr>>(
-        &mut self,
-        parent_index: usize,
-        parent_inode: &mut Inode,
-        child_inode_index: usize,
-        child_inode_name: T,
-        file_type: u8,
-    ) -> Result<u32, c_int> {
-        let child_inode_name = child_inode_name.as_ref();
-        self.load_direntry_map(parent_index, parent_inode)?;
-        if let Some(dir_entry_map) = self.dir_entry_map.get_mut(&parent_index) {
-            let name_len = child_inode_name.len() as u8;
-            let mut name = [0u8; 256];
-            (&mut name[0..child_inode_name.len()]).copy_from_slice(child_inode_name.as_bytes());
-
-            let dir_entry = DirectoryEntry {
-                inode: child_inode_index as u32,
-                record_len: 264,
-                name_len,
-                file_type,
-                name,
-            };
-
-            let (entry_index, _) =
-                dir_entry_map.insert_full(child_inode_name.to_os_string(), dir_entry);
-            debug!(
-                "  add_direntry(ino: {}) using hashmap, entry {}",
-                parent_index, entry_index
-            );
-            parent_inode.size += 1;
-            Ok(entry_index as u32)
-        } else {
-            Err(ENOENT)
-        }
-    }
-
-    pub(crate) fn get_direntry_by_name<T: AsRef<OsStr>>(
-        &mut self,
-        parent_index: usize,
-        parent_inode: &Inode,
-        name: T,
-    ) -> Result<DirectoryEntry, c_int> {
-        self.load_direntry_map(parent_index, parent_inode)?;
-        if let Some(dir_entry_map) = self.dir_entry_map.get(&parent_index) {
-            debug!(
-                "  get_direntry(ino: {}, name: {:?}) using hashmap",
-                parent_index, name.as_ref()
-            );
-            dir_entry_map
-                .get(name.as_ref())
-                .cloned()
-                .ok_or(ENOENT)
-        } else {
-            Err(ENOENT)
-        }
-    }
-
-    pub(crate) fn get_direntry(
-        &mut self,
-        parent_index: usize,
-        parent_inode: &Inode,
-        entry_index: u32,
-    ) -> Result<DirectoryEntry, c_int> {
-        self.load_direntry_map(parent_index, parent_inode)?;
-        if let Some(dir_entry_map) = self.dir_entry_map.get(&parent_index) {
-            debug!(
-                "  get_direntry(ino: {}, entry_index: {}) using hashmap",
-                parent_index, entry_index
-            );
-            dir_entry_map
-                .iter()
-                .skip(entry_index as usize)
-                .next()
-                .map(|entry| entry.1.clone())
-                .ok_or(ENOENT)
-        } else {
-            Err(ENOENT)
-        }
-    }
-
-    /// 返回 inode_index, inode 在 parent 里的 index, inode 本身
-    pub fn lookup_name(
-        &mut self,
-        parent_index: usize,
-        parent_inode: &Inode,
-        name: &OsStr,
-    ) -> Result<(u32, u32, Inode), c_int> {
-        self.load_direntry_map(parent_index, parent_inode)?;
-        if let Some(dir_entry_map) = self.dir_entry_map.get(&parent_index) {
-            if let Some((entry_index, _, dir_entry)) = dir_entry_map.get_full(name) {
-                let inode_index = dir_entry.inode;
-                let inode = self.get_inode(inode_index as usize).unwrap().clone();
-                Ok((inode_index, entry_index as u32, inode))
-            } else {
-                Err(ENOENT)
-            }
-        } else {
-            let mut entry_index = 0;
-            while entry_index < parent_inode.size {
-                if let Ok(entry) = self.get_direntry(parent_index, parent_inode, entry_index) {
-                    if entry.name() == name {
-                        let inode = self.get_inode(entry.inode as usize).unwrap().clone();
-                        return Ok((entry.inode, entry_index, inode));
-                    }
-                }
-                entry_index += 1;
-            }
-            Err(ENOENT)
-        }
-    }
-}
diff --git a/ayafs/src/memory/file_handle.rs b/ayafs/src/memory/file_handle.rs
deleted file mode 100644
index c821619..0000000
--- a/ayafs/src/memory/file_handle.rs
+++ /dev/null
@@ -1,15 +0,0 @@
-use crate::AyaFS;
-use std::sync::atomic::Ordering;
-
-impl AyaFS {
-    pub(crate) fn allocate_file_descriptor(
-        &mut self,
-        inode_index: usize,
-        read: bool,
-        write: bool,
-    ) -> u64 {
-        let fd = self.next_file_handle.fetch_add(1, Ordering::SeqCst);
-        self.file_handle_map.insert(fd, (inode_index, read, write));
-        fd
-    }
-}
diff --git a/ayafs/src/memory/mod.rs b/ayafs/src/memory/mod.rs
deleted file mode 100644
index d1f1ab8..0000000
--- a/ayafs/src/memory/mod.rs
+++ /dev/null
@@ -1,6 +0,0 @@
-/// In-memory data structures and logic.
-/// This is where the crucial block and inode methods presented to upper calls implemented.
-pub mod cached_block;
-pub mod cached_inode;
-mod dir_entry;
-mod file_handle;