BSONObject newContent = storage.inlineOrInsertContentsAndBackRefs(55,
contents, offset, len, fileId, filename, contentType);
// check if it has changed
ContentPointer newContents = getContentPointer(newContent);
if (newContents.contentEquals(oldContents))
return;
metaData.removeField("sha");
metaData.removeField("length");
metaData.removeField("in");