From cd0163da154367f5437ae1423bc97c450d74adf7 Mon Sep 17 00:00:00 2001
From: Chuyan Zhang <me@zcy.moe>
Date: Sat, 18 Nov 2023 02:15:11 -0800
Subject: I hate cache!

---
 src/disk/bitmap.rs | 28 ++++++++++++++--------------
 1 file changed, 14 insertions(+), 14 deletions(-)

(limited to 'src/disk/bitmap.rs')

diff --git a/src/disk/bitmap.rs b/src/disk/bitmap.rs
index d5a8fe9..64389c2 100644
--- a/src/disk/bitmap.rs
+++ b/src/disk/bitmap.rs
@@ -1,4 +1,5 @@
 use crate::block_device::{BlockDevice, BLOCK_SIZE};
+use std::cell::RefCell;
 use std::sync::Arc;
 
 pub struct Bitmap {
@@ -6,7 +7,6 @@ pub struct Bitmap {
     pub length: usize,
     pub device: Arc<dyn BlockDevice>,
     pub data: Vec<u8>,
-    pub dirty_blocks: Vec<usize>,
 }
 
 impl Bitmap {
@@ -16,15 +16,14 @@ impl Bitmap {
             length,
             device,
             data: vec![0u8; length * BLOCK_SIZE],
-            dirty_blocks: Vec::new(),
         }
     }
     pub fn allocate(&mut self) -> Option<usize> {
+        // let mut data = self.data.borrow_mut();
         for (i, byte) in self.data.iter_mut().enumerate() {
             let leading_ones = byte.leading_ones();
             if leading_ones != 8 {
                 *byte |= (1 << (7 - leading_ones)) as u8;
-                self.dirty_blocks.push(i / BLOCK_SIZE);
                 return Some(i * 8 + leading_ones as usize);
             }
         }
@@ -33,6 +32,7 @@ impl Bitmap {
     }
 
     pub fn query(&self, index: usize) -> bool {
+        // let data = self.data.borrow();
         if index == 0 {
             false
         } else {
@@ -40,15 +40,15 @@ impl Bitmap {
         }
     }
 
-    fn write_back(&mut self) {
-        for block_index_offset in self.dirty_blocks.iter() {
-            let buffer_front_index = BLOCK_SIZE * block_index_offset;
-            let buffer_back_index = BLOCK_SIZE * (block_index_offset + 1);
-            self.device.write(
-                self.starting_block + block_index_offset,
-                &self.data[buffer_front_index..buffer_back_index],
-            );
-        }
-        self.dirty_blocks = Vec::new();
-    }
+    // fn write_back(&mut self) {
+    //     for block_index_offset in self.dirty_blocks.iter() {
+    //         let buffer_front_index = BLOCK_SIZE * block_index_offset;
+    //         let buffer_back_index = BLOCK_SIZE * (block_index_offset + 1);
+    //         self.device.write(
+    //             self.starting_block + block_index_offset,
+    //             &self.data[buffer_front_index..buffer_back_index],
+    //         );
+    //     }
+    //     self.dirty_blocks = Vec::new();
+    // }
 }
-- 
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