don't use full allocation on network drives (on windows)

ChangeLog

@@ -1,5 +1,6 @@
 1.0 release
 
+	* don't use full allocation on network drives (on windows)
 	* added clear_piece_deadlines() to remove all piece deadlines
 	* improve queuing logic of inactive torrents (dont_count_slow_torrents)
 	* expose optimistic unchoke logic to plugins

src/storage.cpp

@@ -405,6 +405,14 @@ namespace libtorrent
 	bool default_storage::initialize(bool allocate_files)
 	{
 		m_allocate_files = allocate_files;
+
+#ifdef TORRENT_WINDOWS
+		// don't do full file allocations on network drives
+		int drive_type = GetDriveType(m_save_path.c_str());
+		if (drive_type == DRIVE_REMOTE)
+			m_allocate_files = false;
+#endif
+
 		error_code ec;
 		m_file_created.resize(files().num_files(), false);