IDE write-through with configurable property.

Co-authored-by: LSantha <LSantha@users.noreply.github.com>

Author: opencode-agent[bot]

fs/src/driver/org/jnode/driver/block/ide/disk/IDEDiskDriver.java

@@ -53,6 +53,7 @@
 import org.jnode.partitions.ibm.IBMPartitionTable;
 import org.jnode.partitions.ibm.IBMPartitionTableEntry;
 import org.jnode.util.TimeoutException;
+import org.jnode.vm.VmIOContext;
 
 /**
  * Device driver for IDE disks.
@@ -84,6 +85,7 @@ public class IDEDiskDriver extends Driver
     private boolean is48bit;
     private IDEDiskBus diskBus;
     private IBMPartitionTable pt;
+    private boolean writeThrough = true;
 
     protected void startDevice() throws DriverException {
         final IDEDevice dev = (IDEDevice) getDevice();
@@ -99,6 +101,9 @@ protected void startDevice() throws DriverException {
         is48bit = descr.supports48bitAddressing();
         maxSector = descr.getSectorsAddressable();
 
+        writeThrough = !"false".equals(
+            VmIOContext.getGlobalProperties().getProperty("jnode.ide.writethrough"));
+
         // Look for partitions
         try {
             // Find the devicemanager
@@ -269,6 +274,10 @@ protected void transfer(long devOffset, ByteBuffer buf, boolean isWrite) throws
             length -= partLength;
             devOffset += partLength;
         }
+
+        if (isWrite && writeThrough) {
+            flush();
+        }
     }
 
     static class IDEDiskBus extends Bus {