diff --git a/fs/cifs/smb2pdu.h b/fs/cifs/smb2pdu.h
index 6183b1b..b50a129 100644
--- a/fs/cifs/smb2pdu.h
+++ b/fs/cifs/smb2pdu.h
@@ -534,9 +534,16 @@
 	} Data;
 } __packed;
 
+#define COPY_CHUNK_RES_KEY_SIZE	24
+struct resume_key_req {
+	char ResumeKey[COPY_CHUNK_RES_KEY_SIZE];
+	__le32	ContextLength;	/* MBZ */
+	char	Context[0];	/* ignored, Windows sets to 4 bytes of zero */
+} __packed;
+
 /* this goes in the ioctl buffer when doing a copychunk request */
 struct copychunk_ioctl {
-	char SourceKey[24];
+	char SourceKey[COPY_CHUNK_RES_KEY_SIZE];
 	__le32 ChunkCount; /* we are only sending 1 */
 	__le32 Reserved;
 	/* array will only be one chunk long for us */
@@ -546,6 +553,12 @@
 	__u32 Reserved2;
 } __packed;
 
+struct copychunk_ioctl_rsp {
+	__le32 ChunksWritten;
+	__le32 ChunkBytesWritten;
+	__le32 TotalBytesWritten;
+} __packed;
+
 /* Response and Request are the same format */
 struct validate_negotiate_info {
 	__le32 Capabilities;