CIFS: Add SMB2.1 lease break support

Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org>
Signed-off-by: Steve French <sfrench@us.ibm.com>
diff --git a/fs/cifs/smb2pdu.h b/fs/cifs/smb2pdu.h
index e818a5c..da09922 100644
--- a/fs/cifs/smb2pdu.h
+++ b/fs/cifs/smb2pdu.h
@@ -693,6 +693,31 @@
 	__u64  VolatileFid;
 } __packed;
 
+#define SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED cpu_to_le32(0x01)
+
+struct smb2_lease_break {
+	struct smb2_hdr hdr;
+	__le16 StructureSize; /* Must be 44 */
+	__le16 Reserved;
+	__le32 Flags;
+	__u8   LeaseKey[16];
+	__le32 CurrentLeaseState;
+	__le32 NewLeaseState;
+	__le32 BreakReason;
+	__le32 AccessMaskHint;
+	__le32 ShareMaskHint;
+} __packed;
+
+struct smb2_lease_ack {
+	struct smb2_hdr hdr;
+	__le16 StructureSize; /* Must be 36 */
+	__le16 Reserved;
+	__le32 Flags;
+	__u8   LeaseKey[16];
+	__le32 LeaseState;
+	__le64 LeaseDuration;
+} __packed;
+
 /*
  *	PDU infolevel structure definitions
  *	BB consider moving to a different header