ubifs: Add logging functions for ubifs_msg, ubifs_err and ubifs_warn

The existing logging macros are fairly large and converting the
macros to functions make the object code smaller.

Use %pV and __builtin_return_address(0) as appropriate.

$ size fs/ubifs/built-in.o*
   text	   data	    bss	    dec	    hex	filename
 575831	 309688	 161312	1046831	  ff92f	fs/ubifs/built-in.o.allyesconfig.new
 622457	 312872	 161120	1096449	 10bb01	fs/ubifs/built-in.o.allyesconfig.old
 223785	    640	    644	 225069	  36f2d	fs/ubifs/built-in.o.defconfig.new
 251873	    640	    644	 253157	  3dce5	fs/ubifs/built-in.o.defconfig.old
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

fs/ubifs/Makefile

@@ -4,3 +4,4 @@ ubifs-y += shrinker.o journal.o file.o dir.o super.o sb.o io.o
 ubifs-y += tnc.o master.o scan.o replay.o log.o commit.o gc.o orphan.o
 ubifs-y += budget.o find.o tnc_commit.o compress.o lpt.o lprops.o
 ubifs-y += recovery.o ioctl.o lpt_commit.o tnc_misc.o xattr.o debug.o
+ubifs-y += misc.o

fs/ubifs/misc.c

+#include <linux/kernel.h>
+#include "ubifs.h"
+
+/* Normal UBIFS messages */
+void ubifs_msg(const struct ubifs_info *c, const char *fmt, ...)
+{
+	struct va_format vaf;
+	va_list args;
+
+	va_start(args, fmt);
+
+	vaf.fmt = fmt;
+	vaf.va = &args;
+
+	pr_notice("UBIFS (ubi%d:%d): %pV\n",
+		  c->vi.ubi_num, c->vi.vol_id, &vaf);
+
+	va_end(args);
+}								    \
+
+/* UBIFS error messages */
+void ubifs_err(const struct ubifs_info *c, const char *fmt, ...)
+{
+	struct va_format vaf;
+	va_list args;
+
+	va_start(args, fmt);
+
+	vaf.fmt = fmt;
+	vaf.va = &args;
+
+	pr_err("UBIFS error (ubi%d:%d pid %d): %ps: %pV\n",
+	       c->vi.ubi_num, c->vi.vol_id, current->pid,
+	       __builtin_return_address(0),
+	       &vaf);
+
+	va_end(args);
+}								    \
+
+/* UBIFS warning messages */
+void ubifs_warn(const struct ubifs_info *c, const char *fmt, ...)
+{
+	struct va_format vaf;
+	va_list args;
+
+	va_start(args, fmt);
+
+	vaf.fmt = fmt;
+	vaf.va = &args;
+
+	pr_warn("UBIFS warning (ubi%d:%d pid %d): %ps: %pV\n",
+		c->vi.ubi_num, c->vi.vol_id, current->pid,
+		__builtin_return_address(0),
+		&vaf);
+
+	va_end(args);
+}

fs/ubifs/ubifs.h

@@ -42,30 +42,6 @@
 /* Version of this UBIFS implementation */
 #define UBIFS_VERSION 1
 
-/* Normal UBIFS messages */
-#define ubifs_msg(c, fmt, ...)                                      \
-	pr_notice("UBIFS (ubi%d:%d): " fmt "\n",                    \
-		  (c)->vi.ubi_num, (c)->vi.vol_id, ##__VA_ARGS__)
-/* UBIFS error messages */
-#define ubifs_err(c, fmt, ...)                                      \
-	pr_err("UBIFS error (ubi%d:%d pid %d): %s: " fmt "\n",      \
-	       (c)->vi.ubi_num, (c)->vi.vol_id, current->pid,       \
-	       __func__, ##__VA_ARGS__)
-/* UBIFS warning messages */
-#define ubifs_warn(c, fmt, ...)                                     \
-	pr_warn("UBIFS warning (ubi%d:%d pid %d): %s: " fmt "\n",   \
-		(c)->vi.ubi_num, (c)->vi.vol_id, current->pid,      \
-		__func__, ##__VA_ARGS__)
-/*
- * A variant of 'ubifs_err()' which takes the UBIFS file-sytem description
- * object as an argument.
- */
-#define ubifs_errc(c, fmt, ...)                                     \
-	do {                                                        \
-		if (!(c)->probing)                                  \
-			ubifs_err(c, fmt, ##__VA_ARGS__);           \
-	} while (0)
-
 /* UBIFS file system VFS magic number */
 #define UBIFS_SUPER_MAGIC 0x24051905
 
@@ -1802,4 +1778,21 @@ int ubifs_decompress(const struct ubifs_info *c, const void *buf, int len,
 #include "misc.h"
 #include "key.h"
 
+/* Normal UBIFS messages */
+__printf(2, 3)
+void ubifs_msg(const struct ubifs_info *c, const char *fmt, ...);
+__printf(2, 3)
+void ubifs_err(const struct ubifs_info *c, const char *fmt, ...);
+__printf(2, 3)
+void ubifs_warn(const struct ubifs_info *c, const char *fmt, ...);
+/*
+ * A variant of 'ubifs_err()' which takes the UBIFS file-sytem description
+ * object as an argument.
+ */
+#define ubifs_errc(c, fmt, ...)						\
+do {									\
+	if (!(c)->probing)						\
+		ubifs_err(c, fmt, ##__VA_ARGS__);			\
+} while (0)
+
 #endif /* !__UBIFS_H__ */