SMB3: update structures for new compression protocol definitions

Protocol has been extended for additional compression headers.
See MS-SMB2 section 2.2.42
Signed-off-by: NSteve French <stfrench@microsoft.com>

fs/cifs/smb2pdu.h

@@ -144,7 +144,7 @@ struct smb2_transform_hdr {
 } __packed;
 
 /* See MS-SMB2 2.2.42 */
-struct smb2_compression_transform_hdr {
+struct smb2_compression_transform_hdr_unchained {
 	__le32 ProtocolId;	/* 0xFC 'S' 'M' 'B' */
 	__le32 OriginalCompressedSegmentSize;
 	__le16 CompressionAlgorithm;
@@ -160,10 +160,17 @@ struct compression_payload_header {
 	__le16	CompressionAlgorithm;
 	__le16	Flags;
 	__le32	Length; /* length of compressed playload including field below if present */
-	/* __le32 OriginalPayloadSize; */ /* optional */
+	/* __le32 OriginalPayloadSize; */ /* optional, present when LZNT1, LZ77, LZ77+Huffman */
 } __packed;
 
 /* See MS-SMB2 2.2.42.2 */
+struct smb2_compression_transform_hdr_chained {
+	__le32 ProtocolId;	/* 0xFC 'S' 'M' 'B' */
+	__le32 OriginalCompressedSegmentSize;
+	/* struct compression_payload_header[] */
+} __packed;
+
+/* See MS-SMB2 2.2.42.2.2 */
 struct compression_pattern_payload_v1 {
 	__le16	Pattern;
 	__le16	Reserved1;