+static u64
+get_sort_key(HANDLE h)
+{
+ STARTING_VCN_INPUT_BUFFER in = { .StartingVcn.QuadPart = 0 };
+ RETRIEVAL_POINTERS_BUFFER out;
+ DWORD bytesReturned;
+
+ if (!DeviceIoControl(h, FSCTL_GET_RETRIEVAL_POINTERS,
+ &in, sizeof(in),
+ &out, sizeof(out),
+ &bytesReturned, NULL))
+ return 0;
+
+ if (out.ExtentCount < 1)
+ return 0;
+
+ return out.Extents[0].Lcn.QuadPart;
+}
+
+static void
+set_sort_key(struct wim_inode *inode, u64 sort_key)
+{
+ for (unsigned i = 0; i < inode->i_num_streams; i++) {
+ struct wim_inode_stream *strm = &inode->i_streams[i];
+ struct blob_descriptor *blob = stream_blob_resolved(strm);
+ if (blob && (blob->blob_location == BLOB_IN_WINNT_FILE_ON_DISK ||
+ blob->blob_location == BLOB_WIN32_ENCRYPTED))
+ blob->sort_key = sort_key;
+ }
+}
+