new branch to integrate BlockDevice, BlockCache

git-svn-id: https://profuse.googlecode.com/svn/branches/profuse_interim@331 aa027e90-d47c-11dd-86d7-074df07e0730

Cache/BlockCache.cpp

@@ -0,0 +1,73 @@
+
+#include <algorithm>
+#include <cerrno>
+#include <cstring>
+
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <unistd.h>
+
+
+#include <Cache/BlockCache.h>
+#include <Device/BlockDevice.h>
+
+#include <ProFUSE/Exception.h>
+#include <ProFUSE/auto.h>
+
+
+
+
+using namespace Device;
+
+using ProFUSE::Exception;
+using ProFUSE::POSIXException;
+
+
+BlockCache::BlockCache(BlockDevice *device)
+{
+    _device = device;
+    _blocks = device->blocks();
+    _readOnly = device->readOnly();
+}
+
+BlockCache::~BlockCache()
+{
+    delete _device;
+}
+
+void BlockCache::write(unsigned block, const void *bp)
+{
+    void *address = acquire(block);
+    std::memcpy(address, bp, 512);
+    release(block, true);
+}
+
+void BlockCache::read(unsigned block, void *bp)
+{
+    void *address = acquire(block);
+    std::memcpy(bp, address, 512);
+    release(block, false);
+}
+
+
+BlockCache *BlockCache::Create(BlockDevice *device)
+{
+    if (!device) return NULL;
+    
+    return device->createBlockCache();
+}
+
+
+void BlockCache::zeroBlock(unsigned block)
+{
+    /*
+    void *address = acquire(block);
+    std::memset(address, 0, 512);
+    release(block, true);
+    */
+
+    uint8_t buffer[512];
+    
+    std::memset(buffer, 0, 512);
+    write(block, buffer);    
+}