1 files changed, 9 insertions, 7 deletions
diff --git a/src/memory/cached_block.rs b/src/memory/cached_block.rs
index 9e266ef..eb59a4b 100644
--- a/src/memory/cached_block.rs
+++ b/src/memory/cached_block.rs
@@ -2,6 +2,7 @@ use crate::block_device::{BlockDevice, BLOCK_SIZE};
 use crate::disk::block::Block;
 use crate::AyaFS;
 use and_then_some::BoolExt;
+use log::debug;
 use lru::LruCache;
 use std::num::NonZeroUsize;
 use std::sync::Arc;
@@ -46,11 +47,9 @@ impl<T: Block> BlockCache<T> {
 
     pub(crate) fn load_block(&mut self, index: usize) -> bool {
         if self.cache.contains(&index) == false {
-            let block = T::default();
-            let buffer = unsafe {
-                std::slice::from_raw_parts_mut(&block as *const T as *mut u8, BLOCK_SIZE)
-            };
-            self.device.read(index, buffer);
+            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,
@@ -77,8 +76,11 @@ impl<T: Block> BlockCache<T> {
 
     /// 从 LRU cache 里获取一个 block 的可变引用, 如果没有在 cache 中会加载.
     pub(crate) fn get_block_mut<U: Block>(&mut self, index: usize) -> Option<&mut CachedBlock<U>> {
-        self.load_block(index)
-            .and_then(|| self.cache.get_mut(&index).map(convert_mut::<T, U>))
+        debug!("Blockcache get block mut");
+        self.load_block(index).and_then(|| {
+            debug!("block loaded");
+            self.cache.get_mut(&index).map(convert_mut::<T, U>)
+        })
     }
 
     /// 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.