v4.19.13 snapshot.
diff --git a/fs/cifs/cifs_debug.h b/fs/cifs/cifs_debug.h
new file mode 100644
index 0000000..f4f3f08
--- /dev/null
+++ b/fs/cifs/cifs_debug.h
@@ -0,0 +1,86 @@
+/*
+ *
+ * Copyright (c) International Business Machines Corp., 2000,2002
+ * Modified by Steve French (sfrench@us.ibm.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
+ * the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+*/
+
+#ifndef _H_CIFS_DEBUG
+#define _H_CIFS_DEBUG
+
+void cifs_dump_mem(char *label, void *data, int length);
+void cifs_dump_detail(void *buf, struct TCP_Server_Info *ptcp_info);
+void cifs_dump_mids(struct TCP_Server_Info *);
+extern bool traceSMB; /* flag which enables the function below */
+void dump_smb(void *, int);
+#define CIFS_INFO 0x01
+#define CIFS_RC 0x02
+#define CIFS_TIMER 0x04
+
+#define VFS 1
+#define FYI 2
+extern int cifsFYI;
+#ifdef CONFIG_CIFS_DEBUG2
+#define NOISY 4
+#else
+#define NOISY 0
+#endif
+#define ONCE 8
+
+/*
+ * debug ON
+ * --------
+ */
+#ifdef CONFIG_CIFS_DEBUG
+
+/* information message: e.g., configuration, major event */
+#define cifs_dbg_func(ratefunc, type, fmt, ...) \
+do { \
+ if ((type) & FYI && cifsFYI & CIFS_INFO) { \
+ pr_debug_ ## ratefunc("%s: " \
+ fmt, __FILE__, ##__VA_ARGS__); \
+ } else if ((type) & VFS) { \
+ pr_err_ ## ratefunc("CIFS VFS: " \
+ fmt, ##__VA_ARGS__); \
+ } else if ((type) & NOISY && (NOISY != 0)) { \
+ pr_debug_ ## ratefunc(fmt, ##__VA_ARGS__); \
+ } \
+} while (0)
+
+#define cifs_dbg(type, fmt, ...) \
+do { \
+ if ((type) & ONCE) \
+ cifs_dbg_func(once, \
+ type, fmt, ##__VA_ARGS__); \
+ else \
+ cifs_dbg_func(ratelimited, \
+ type, fmt, ##__VA_ARGS__); \
+} while (0)
+
+/*
+ * debug OFF
+ * ---------
+ */
+#else /* _CIFS_DEBUG */
+#define cifs_dbg(type, fmt, ...) \
+do { \
+ if (0) \
+ pr_debug(fmt, ##__VA_ARGS__); \
+} while (0)
+#endif
+
+#endif /* _H_CIFS_DEBUG */