[PATCH 2/8] nilfs2: add nilfs_msg() message interface

[Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>]

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.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
---
 fs/nilfs2/nilfs.h |  7 +++++++
 fs/nilfs2/super.c | 16 ++++++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/fs/nilfs2/nilfs.h b/fs/nilfs2/nilfs.h
index e482c78..b57ce41e 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 7fe497e..86e3c00 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;
-- 
1.8.3.1