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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>
This commit is contained in:
Ryusuke Konishi 2016-08-02 14:05:02 -07:00 committed by Linus Torvalds
parent cae3d4ca6f
commit a66dfb0a91
2 changed files with 23 additions and 0 deletions
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7
fs/nilfs2/nilfs.h
View File

@ -300,6 +300,9 @@ static inline int nilfs_mark_inode_dirty_sync(struct inode *inode)
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, ...);
@ -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__); \

16
fs/nilfs2/super.c
View File

@ -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;