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nilfs2: add nilfs_msg() message interface

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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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16
fs/nilfs2/super.c
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@@ -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;