From ff62de072261c2ee49ea817c51c5ec7c6e74775f Mon Sep 17 00:00:00 2001
From: Direktor799 <priceclaptrap@hotmail.com>
Date: Sat, 28 May 2022 11:25:55 +0800
Subject: [PATCH] fix(BlockCache): Vec as aligned buf

use a Vec allocated from buddy system to make sure it's well aligned
---
 easy-fs/src/block_cache.rs | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/easy-fs/src/block_cache.rs b/easy-fs/src/block_cache.rs
index 4b90294..1b3b969 100644
--- a/easy-fs/src/block_cache.rs
+++ b/easy-fs/src/block_cache.rs
@@ -1,11 +1,13 @@
 use super::{BlockDevice, BLOCK_SZ};
 use alloc::collections::VecDeque;
 use alloc::sync::Arc;
+use alloc::vec;
+use alloc::vec::Vec;
 use lazy_static::*;
 use spin::Mutex;
 
 pub struct BlockCache {
-    cache: [u8; BLOCK_SZ],
+    cache: Vec<u8>,
     block_id: usize,
     block_device: Arc<dyn BlockDevice>,
     modified: bool,
@@ -14,7 +16,8 @@ pub struct BlockCache {
 impl BlockCache {
     /// Load a new BlockCache from disk.
     pub fn new(block_id: usize, block_device: Arc<dyn BlockDevice>) -> Self {
-        let mut cache = [0u8; BLOCK_SZ];
+        // for alignment and move effciency
+        let mut cache = vec![0u8; BLOCK_SZ];
         block_device.read_block(block_id, &mut cache);
         Self {
             cache,