ext3: Unify log messages in ext3

Make messages produced by ext3 more unified. It should be
easy to parse.

dmesg before patch:
[ 4893.684892] reservations ON
[ 4893.684896] xip option not supported
[ 4893.684964] EXT3-fs warning: maximal mount count reached, running
e2fsck is recommended

dmesg after patch:
[  873.300792] EXT3-fs (loop0): using internal journaln
[  873.300796] EXT3-fs (loop0): mounted filesystem with writeback data mode
[  924.163657] EXT3-fs (loop0): error: can't find ext3 filesystem on dev loop0.
[  723.755642] EXT3-fs (loop0): error: bad blocksize 8192
[  357.874687] EXT3-fs (loop0): error: no journal found. mounting ext3 over ext2?
[  873.300764] EXT3-fs (loop0): warning: maximal mount count reached, running e2fsck is recommended
[  924.163657] EXT3-fs (loop0): error: can't find ext3 filesystem on dev loop0.
Signed-off-by: Alexey Fisher <bug-track@fisher-privat.net>
Signed-off-by: Jan Kara <jack@suse.cz>

include/linux/ext3_fs.h

@@ -918,6 +918,8 @@ extern void ext3_abort (struct super_block *, const char *, const char *, ...)
 	__attribute__ ((format (printf, 3, 4)));
 extern void ext3_warning (struct super_block *, const char *, const char *, ...)
 	__attribute__ ((format (printf, 3, 4)));
+extern void ext3_msg(struct super_block *, const char *, const char *, ...)
+	__attribute__ ((format (printf, 3, 4)));
 extern void ext3_update_dynamic_rev (struct super_block *sb);
 
 #define ext3_std_error(sb, errno)				\