1 files changed, 0 insertions, 139 deletions
diff --git a/src/kernel/bio.cc b/src/kernel/bio.cc
deleted file mode 100644
index 5f1aae9..0000000
--- a/src/kernel/bio.cc
+++ /dev/null
@@ -1,139 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Copyright (C) 2026 Richard QIn
- */
-#include "kernel/buf.h"
-#include "kernel/spinlock.h"
-#include "kernel/riscv.h"
-#include "drivers/virtio.h"
-#include "drivers/uart.h"
-
-namespace BufferCache
-{
-    struct 
-    {
-        Spinlock lock;
-        struct Buf buf[NBUF];
-        struct Buf head;
-    } bcache;
-
-    void init()
-    {
-        bcache.lock.init("bcache");
-        // Initialize LRU doubly circular linked list
-        bcache.head.prev = &bcache.head;
-        bcache.head.next = &bcache.head;
-        for (struct Buf *b = bcache.buf; b < bcache.buf + NBUF; ++b)
-        {
-            b->lock.init("buffer");
-            b->next = bcache.head.next;
-            b->prev = &bcache.head;
-            bcache.head.next->prev = b;
-            bcache.head.next = b;
-        }
-        Drivers::uart_puts("[Bio] Buffer cache initialized.\n");
-    }
-
-    static struct Buf* bget(uint32 dev, uint32 blockno)
-    {
-        struct Buf* b;
-        bcache.lock.acquire();
-
-        // Attempt to hit the cache
-        for (b = bcache.head.next; b != &bcache.head; b = b->next)
-        {
-            if (b->dev == dev && b->blockno == blockno)
-            {
-                b->refcnt++;
-                bcache.lock.release();
-                b->lock.acquire(); // Acquire Sleep Lock
-                return b;
-            }
-        }
-
-        // Cache miss, evicting LRU
-        for (b = bcache.head.prev; b != &bcache.head; b = b->prev)
-        {
-            if (b->refcnt == 0)
-            {
-                b->dev = dev;
-                b->blockno = blockno;
-                b->valid = 0;
-                b->refcnt = 1;
-                bcache.lock.release();
-                b->lock.acquire();
-                return b;
-            }
-        }
-
-        Drivers::uart_puts("panic: bget: no buffers\n");
-        while (1)
-            ;
-    }
-
-    struct Buf* bread(uint32 dev, uint32 blockno)
-    {
-        struct Buf *b = bget(dev, blockno);
-
-        if (!b->valid)
-        {
-            VirtIO::rw(0, b->blockno, (char *)b->data);
-            b->valid = 1;
-        }
-
-        return b;
-    }
-
-    void bwrite(struct Buf *b)
-    {
-        if (!b->lock.holding())
-        { 
-            Drivers::uart_puts("panic: bwrite\n");
-            while (1)
-                ;
-        }
-        VirtIO::rw(1, b->blockno, (char *)b->data);
-    }
-
-    void brelse(struct Buf *b)
-    {
-        if (!b->lock.holding())
-        {
-            Drivers::uart_puts("panic: brelse\n");
-            while (1)
-                ;
-        }
-        b->lock.release();
-
-        bcache.lock.acquire();
-        b->refcnt--;
-
-        if (b->refcnt == 0)
-        {
-            b->next->prev = b->prev;
-            b->prev->next = b->next;
-
-            b->next = bcache.head.next;
-            b->prev = &bcache.head;
-            bcache.head.next->prev = b;
-            bcache.head.next = b;
-        }
-
-        bcache.lock.release();
-    }
-
-    void bpin(struct Buf *b)
-    {
-        bcache.lock.acquire();
-        b->refcnt++;
-        bcache.lock.release();
-    }
-
-    void bunpin(struct Buf* b)
-    {
-        bcache.lock.acquire();
-        b->refcnt --;
-        bcache.lock.release();
-    }
-
-} // namespace BufferCache