CIFS: add ONCE flag for cifs_dbg type

* Since cifs_vfs_error was just using pr_debug_ratelimited like the rest
  of cifs_dbg, move it there too
* Add a ONCE type flag to call the pr_xxx_once() debug function instead
  of the ratelimited ones.

To convert existing printk_once() calls to this we can run:

    perl -i -pE \
      's/printk_once\s*\(([^" \n]+)(.*)/cifs_dbg(VFS|ONCE,$2/g' \
      fs/cifs/*.c
Signed-off-by: Aurelien Aptel <aaptel@suse.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

fs/cifs/cifs_debug.c

@@ -42,23 +42,6 @@ cifs_dump_mem(char *label, void *data, int length)
 		       data, length, true);
 }
 
-#ifdef CONFIG_CIFS_DEBUG
-void cifs_vfs_err(const char *fmt, ...)
-{
-	struct va_format vaf;
-	va_list args;
-
-	va_start(args, fmt);
-
-	vaf.fmt = fmt;
-	vaf.va = &args;
-
-	pr_err_ratelimited("CIFS VFS: %pV", &vaf);
-
-	va_end(args);
-}
-#endif
-
 void cifs_dump_detail(void *buf)
 {
 #ifdef CONFIG_CIFS_DEBUG2

fs/cifs/cifs_debug.h

@@ -39,6 +39,7 @@ extern int cifsFYI;
 #else
 #define NOISY 0
 #endif
+#define ONCE 8
 
 /*
  *	debug ON
@@ -46,19 +47,28 @@ extern int cifsFYI;
  */
 #ifdef CONFIG_CIFS_DEBUG
 
-__printf(1, 2) void cifs_vfs_err(const char *fmt, ...);
-
 /* information message: e.g., configuration, major event */
-#define cifs_dbg(type, fmt, ...)					\
-do {									\
-	if (type == FYI && cifsFYI & CIFS_INFO) {			\
-		pr_debug_ratelimited("%s: "				\
-			    fmt, __FILE__, ##__VA_ARGS__);		\
-	} else if (type == VFS) {					\
-		cifs_vfs_err(fmt, ##__VA_ARGS__);			\
-	} else if (type == NOISY && type != 0) {			\
-		pr_debug_ratelimited(fmt, ##__VA_ARGS__);		\
-	}								\
+#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("CuIFS 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)
 
 /*