// move the pending address into the freelist private void handleRegionSafeToFree(long start_addr, FreespaceExtent extent, LayerWriteGroup wg) { System.Console.WriteLine("*\n*\n*\n* handleRegionSafeToFree {0} \n*\n*\n*", start_addr); // (1) remove pending entry wg.setValue(pendingKeyForAddr(start_addr), RecordUpdate.DeletionTombstone()); // (2) write real freelist entry (TODO: merge with neighboring entries) { RecordKey key = new RecordKey().appendParsedKey(".ROOT/FREELIST/EXTENTS"); key.appendKeyPart(new RecordKeyType_Long(extent.end_addr)); wg.setValue(key, RecordUpdate.WithPayload(extent.pack())); } wg.finish(); }
public void mapSegment(LayerWriteGroup tx, int use_gen, RecordKey start_key, RecordKey end_key, IRegion reader) { if (! (tx.type == LayerWriteGroup.WriteGroupType.DISK_ATOMIC_NOFLUSH || tx.type == LayerWriteGroup.WriteGroupType.DISK_ATOMIC_FLUSH)) { throw new Exception("NewUnusedSegment.mapSegment() must be provided an ATOMIC write group"); } // remove the pending entry RecordKey key = new RecordKey().appendParsedKey(".ROOT/FREELIST/PENDING"); key.appendKeyPart(new RecordKeyType_Long(reader.getStartAddress())); tx.setValue(key, RecordUpdate.DeletionTombstone()); // add the new map tx.mylayer.rangemapmgr.mapGenerationToRegion(tx, use_gen, start_key, end_key, reader); }
public void freeSegment(LayerWriteGroup tx, FreespaceExtent segment_extent) { // (1) add the segment to the pending list (pending free) if (tx.type != LayerWriteGroup.WriteGroupType.DISK_ATOMIC_FLUSH) { throw new Exception("freeSegment() requires DISK_ATOMIC write group"); } // NOTE: DISK_ATOMIC writes are not seen in the memory segment until the atomic write group applies // so these changes will not be seen until then RecordKey key = new RecordKey().appendParsedKey(".ROOT/FREELIST/PENDING") .appendKeyPart(new RecordKeyType_Long(segment_extent.end_addr)); RecordUpdate payload = RecordUpdate.WithPayload(segment_extent.pack()); tx.setValue(key, payload); // (2) add a handler to get notified when the block is no longer referenced, so it can // be moved from pending to actually free. LayerWriteGroup fwg = this.store.newWriteGroup(LayerWriteGroup.WriteGroupType.DISK_ATOMIC_NOFLUSH); // we don't want to ask for the notification until the write-group freeing this segment is finished tx.addCompletion(delegate() { tx.mylayer.regionmgr.notifyRegionSafeToFree(segment_extent.start_addr, delegate(long addr) { this.handleRegionSafeToFree(addr, segment_extent, fwg); }); }); }