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/misc.c

@@ -0,0 +1,57 @@
+#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);
+}