cifs: Add support for FSCTL passthrough that write data to the server

Add support to pass a blob to the server in FSCTL passthrough.
Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

fs/cifs/smb2ops.c

@@ -1382,6 +1382,18 @@ smb2_ioctl_query_info(const unsigned int xid,
 	oparms.fid = &fid;
 	oparms.reconnect = false;
 
+	/*
+	 * FSCTL codes encode the special access they need in the fsctl code.
+	 */
+	if (qi.flags & PASSTHRU_FSCTL) {
+		switch (qi.info_type & FSCTL_DEVICE_ACCESS_MASK) {
+		case FSCTL_DEVICE_ACCESS_FILE_READ_WRITE_ACCESS:
+			oparms.desired_access = FILE_READ_DATA | FILE_WRITE_DATA | FILE_READ_ATTRIBUTES | SYNCHRONIZE;
+			;
+			break;
+		}
+	}
+
 	rc = SMB2_open_init(tcon, &rqst[0], &oplock, &oparms, path);
 	if (rc)
 		goto iqinf_exit;
@@ -1399,8 +1411,9 @@ smb2_ioctl_query_info(const unsigned int xid,
 
 			rc = SMB2_ioctl_init(tcon, &rqst[1],
 					     COMPOUND_FID, COMPOUND_FID,
-					     qi.info_type, true, NULL,
-					     0, CIFSMaxBufSize);
+					     qi.info_type, true, buffer,
+					     qi.output_buffer_length,
+					     CIFSMaxBufSize);
 		}
 	} else if (qi.flags == PASSTHRU_QUERY_INFO) {
 		memset(&qi_iov, 0, sizeof(qi_iov));

fs/cifs/smbfsctl.h

@@ -35,6 +35,33 @@
  * below). Additional detail on less common ones can be found in MS-FSCC
  * section 2.3.
  */
+
+/*
+ * FSCTL values are 32 bits and are constructed as
+ * <device 16bits> <access 2bits> <function 12bits> <method 2bits>
+ */
+/* Device */
+#define FSCTL_DEVICE_DFS                 (0x0006 << 16)
+#define FSCTL_DEVICE_FILE_SYSTEM         (0x0009 << 16)
+#define FSCTL_DEVICE_NAMED_PIPE          (0x0011 << 16)
+#define FSCTL_DEVICE_NETWORK_FILE_SYSTEM (0x0014 << 16)
+#define FSCTL_DEVICE_MASK                0xffff0000
+/* Access */
+#define FSCTL_DEVICE_ACCESS_FILE_ANY_ACCESS        (0x00 << 14)
+#define FSCTL_DEVICE_ACCESS_FILE_READ_ACCESS       (0x01 << 14)
+#define FSCTL_DEVICE_ACCESS_FILE_WRITE_ACCESS      (0x02 << 14)
+#define FSCTL_DEVICE_ACCESS_FILE_READ_WRITE_ACCESS (0x03 << 14)
+#define FSCTL_DEVICE_ACCESS_MASK                   0x0000c000
+/* Function */
+#define FSCTL_DEVICE_FUNCTION_MASK       0x00003ffc
+/* Method */
+#define FSCTL_DEVICE_METHOD_BUFFERED   0x00
+#define FSCTL_DEVICE_METHOD_IN_DIRECT  0x01
+#define FSCTL_DEVICE_METHOD_OUT_DIRECT 0x02
+#define FSCTL_DEVICE_METHOD_NEITHER    0x03
+#define FSCTL_DEVICE_METHOD_MASK       0x00000003
+
+
 #define FSCTL_DFS_GET_REFERRALS      0x00060194
 #define FSCTL_DFS_GET_REFERRALS_EX   0x000601B0
 #define FSCTL_REQUEST_OPLOCK_LEVEL_1 0x00090000