SMB3: clarify some of the unused CreateOption flags

Update comments to show flags which should be not set (zero).

See MS-SMB2 section 2.2.13

Signed-off-by: Steve French <stfrench@microsoft.com>

fs/smb/common/smb2pdu.h

@@ -1097,16 +1097,23 @@ struct smb2_change_notify_rsp {
 #define FILE_WRITE_THROUGH_LE		cpu_to_le32(0x00000002)
 #define FILE_SEQUENTIAL_ONLY_LE		cpu_to_le32(0x00000004)
 #define FILE_NO_INTERMEDIATE_BUFFERING_LE cpu_to_le32(0x00000008)
+/* FILE_SYNCHRONOUS_IO_ALERT_LE		cpu_to_le32(0x00000010) should be zero, ignored */
+/* FILE_SYNCHRONOUS_IO_NONALERT		cpu_to_le32(0x00000020) should be zero, ignored */
 #define FILE_NON_DIRECTORY_FILE_LE	cpu_to_le32(0x00000040)
 #define FILE_COMPLETE_IF_OPLOCKED_LE	cpu_to_le32(0x00000100)
 #define FILE_NO_EA_KNOWLEDGE_LE		cpu_to_le32(0x00000200)
+/* FILE_OPEN_REMOTE_INSTANCE		cpu_to_le32(0x00000400) should be zero, ignored */
 #define FILE_RANDOM_ACCESS_LE		cpu_to_le32(0x00000800)
-#define FILE_DELETE_ON_CLOSE_LE		cpu_to_le32(0x00001000)
+#define FILE_DELETE_ON_CLOSE_LE		cpu_to_le32(0x00001000) /* MBZ */
 #define FILE_OPEN_BY_FILE_ID_LE		cpu_to_le32(0x00002000)
 #define FILE_OPEN_FOR_BACKUP_INTENT_LE	cpu_to_le32(0x00004000)
 #define FILE_NO_COMPRESSION_LE		cpu_to_le32(0x00008000)
+/* FILE_OPEN_REQUIRING_OPLOCK		cpu_to_le32(0x00010000) should be zero, ignored */
+/* FILE_DISALLOW_EXCLUSIVE		cpu_to_le32(0x00020000) should be zero, ignored */
+/* FILE_RESERVE_OPFILTER		cpu_to_le32(0x00100000) MBZ */
 #define FILE_OPEN_REPARSE_POINT_LE	cpu_to_le32(0x00200000)
 #define FILE_OPEN_NO_RECALL_LE		cpu_to_le32(0x00400000)
+/* #define FILE_OPEN_FOR_FREE_SPACE_QUERY cpu_to_le32(0x00800000) should be zero, ignored */
 #define CREATE_OPTIONS_MASK_LE          cpu_to_le32(0x00FFFFFF)
 
 #define FILE_READ_RIGHTS_LE (FILE_READ_DATA_LE | FILE_READ_EA_LE \