nilfs2: add nilfs_msg() message interface

Define an own output routine to replace bare use of printk() function.
The output routine is implemented with a macro and a helper function,
which are named nilfs_msg() and __nilfs_msg(), respectively.

__nilfs_msg() formats a message like "NILFS (<device-name>): <message>",
prefixing it with a given log level, and terminates the statement with a
newline.  The "device-name" is optional to make it available in early
stages; it will be omitted if a NULL pointer is passed to super block
instance argument.  nilfs_msg() wraps __nilfs_msg() and is removed if
CONFIG_PRINTK is not set.

Link: http://lkml.kernel.org/r/1464875891-5443-3-git-send-email-konishi.ryusuke@lab.ntt.co.jp
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 23 insertions, 0 deletions

diff --git a/fs/nilfs2/nilfs.h b/fs/nilfs2/nilfs.h
index e482c78bcc86..b57ce41e8a1a 100644
--- a/fs/nilfs2/nilfs.h
+++ b/fs/nilfs2/nilfs.h
@@ -301,6 +301,9 @@ extern struct inode *nilfs_alloc_inode(struct super_block *);
 extern void nilfs_destroy_inode(struct inode *);
 
 extern __printf(3, 4)
+void __nilfs_msg(struct super_block *sb, const char *level,
+                 const char *fmt, ...);
+extern __printf(3, 4)
 void __nilfs_error(struct super_block *sb, const char *function,
                    const char *fmt, ...);
 extern __printf(3, 4)
@@ -308,11 +311,15 @@ void nilfs_warning(struct super_block *, const char *, const char *, ...);
 
 #ifdef CONFIG_PRINTK
 
+#define nilfs_msg(sb, level, fmt, ...)                                  \
+        __nilfs_msg(sb, level, fmt, ##__VA_ARGS__)
 #define nilfs_error(sb, fmt, ...)                                       \
         __nilfs_error(sb, __func__, fmt, ##__VA_ARGS__)
 
 #else
 
+#define nilfs_msg(sb, level, fmt, ...)                                  \
+        no_printk(fmt, ##__VA_ARGS__)
 #define nilfs_error(sb, fmt, ...)                                       \
         do {                                                            \
                 no_printk(fmt, ##__VA_ARGS__);                          \
diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c
index 7fe497eb2181..86e3c00994e2 100644
--- a/fs/nilfs2/super.c
+++ b/fs/nilfs2/super.c
@@ -71,6 +71,22 @@ struct kmem_cache *nilfs_btree_path_cache;
 static int nilfs_setup_super(struct super_block *sb, int is_mount);
 static int nilfs_remount(struct super_block *sb, int *flags, char *data);
 
+void __nilfs_msg(struct super_block *sb, const char *level, const char *fmt,
+                 ...)
+{
+        struct va_format vaf;
+        va_list args;
+
+        va_start(args, fmt);
+        vaf.fmt = fmt;
+        vaf.va = &args;
+        if (sb)
+                printk("%sNILFS (%s): %pV\n", level, sb->s_id, &vaf);
+        else
+                printk("%sNILFS: %pV\n", level, &vaf);
+        va_end(args);
+}
+
 static void nilfs_set_error(struct super_block *sb)
 {
         struct the_nilfs *nilfs = sb->s_fs_info;