block cache support.

git-svn-id: https://profuse.googlecode.com/svn/branches/v2@220 aa027e90-d47c-11dd-86d7-074df07e0730

Device/DiskCopy42Image.cpp

@@ -9,6 +9,9 @@
 #include <Endian/Endian.h>
 #include <Endian/IOBuffer.h>
 
+#include <Cache/MappedBlockCache.h>
+
+
 using namespace Device;
 using namespace BigEndian;
 
@@ -17,6 +20,7 @@ using ProFUSE::Exception;
 using ProFUSE::POSIXException;
 
 
+
 enum {
     oDataSize = 64,
     oDataChecksum = 72,
@@ -219,4 +223,14 @@ void DiskCopy42Image::write(unsigned block, const void *bp)
 {
     DiskImage::write(block, bp);
     _changed = true;
+}
+
+
+BlockCache *DiskCopy42Image::createBlockCache(unsigned size)
+{
+    // if not readonly, mark changed so crc will be updated at close.
+    
+    if (!readOnly()) _changed = true;
+    
+    return new MappedBlockCache(this, address());
 }