git-svn-id: https://profuse.googlecode.com/svn/branches/v2@205 aa027e90-d47c-11dd-86d7-074df07e0730

Cache/MappedBlockCache.cpp

@@ -0,0 +1,65 @@
+
+#include <algorithm>
+#include <cerrno>
+
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <unistd.h>
+
+#include <Cache/MappedBlockCache.h>
+#include <ProFUSE/Exception.h>
+#include <ProFUSE/auto.h>
+
+
+
+using namespace Device;
+
+using ProFUSE::Exception;
+using ProFUSE::POSIXException;
+
+
+MappedBlockCache::MappedBlockCache(Device *device, void *data) :
+    BlockCache(device)
+{
+    _data = (uint8_t *)data;
+    _dirty = false;
+}
+
+MappedBlockCache::~MappedBlockCache()
+{
+  if (_dirty) sync();
+}
+
+
+void *MappedBlockCache::acquire(unsigned block)
+{
+#undef __METHOD__
+#define __METHOD__ "MappedBlockCache::load"
+    
+    if (block >= blocks())
+        throw Exception(__METHOD__ ": Invalid block.");
+        
+    
+    return _data + block * 512;
+}
+
+void MappedBlockCache::unload(unsigned block, int flags)
+{
+#undef __METHOD__
+#define __METHOD__ "MappedBlockCache::unload"
+
+    if (flags & kBlockCommitNow)
+    {
+        _dirty = true;
+        sync();
+        return;
+    }
+
+    if (flags & kBlockDirty) _dirty = true;
+}
+
+void MappedBlockCache::sync()
+{
+  _device->sync();
+  _dirty = false;
+}