linux-kernel - Re: [PATCH 1/2] Introduce fat_msg() for unified kernel messages

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Date:	Tue, 09 Nov 2010 09:25:41 -0800
From:	Joe Perches <joe@...ches.com>
To:	Alexey Fisher <bug-track@...her-privat.net>
Cc:	linux-kernel@...r.kernel.org,
	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
Subject: Re: [PATCH 1/2] Introduce fat_msg() for unified kernel messages

On Tue, 2010-11-09 at 17:55 +0100, Alexey Fisher wrote:
> Add fat_msg() function to unify printkas. And use it
> to report mounts and remounts.

Hi Alexey.

> new dmesg looks like this:
> [ 6264.957109] FAT-fs (sdg1): Mounted. Opts: uid=1000,gid=1000,shortname=mixed,dmask=0077,utf8=1,showexec,flush
> [ 6402.175028] FAT-fs (sdg1): re-mounted. Opts: (null)
> 
> Signed-off-by: Alexey Fisher <bug-track@...her-privat.net>
> ---
>  fs/fat/inode.c |   20 ++++++++++++++++++++
>  1 files changed, 20 insertions(+), 0 deletions(-)
> 
> diff --git a/fs/fat/inode.c b/fs/fat/inode.c
> index ad6998a..4699173 100644
> --- a/fs/fat/inode.c
> +++ b/fs/fat/inode.c
> @@ -37,6 +37,20 @@
>  static int fat_default_codepage = CONFIG_FAT_DEFAULT_CODEPAGE;
>  static char fat_default_iocharset[] = CONFIG_FAT_DEFAULT_IOCHARSET;
>  
> +/* unify messages.
> + * this function is copy of ext4_msg() from fs/ext4/super.c
> + */
> +void fat_msg(struct super_block *sb, const char *prefix,
> +			const char *fmt, ...)
> +{
> +	va_list args;
> +
> +	va_start(args, fmt);
> +	printk("%sFAT-fs (%s): ", prefix, sb->s_id);
> +	vprintk(fmt, args);
> +	printk("\n");
> +	va_end(args);
> +}

A few comments:

The first patch should put the prototype for fat_msg in
fs/fat/fat.h file and the body as done here.

The prototype should use attribute_ printf so format
and argument are type checked.

This would be better using the %pV extension so a
single printk call is done and the dmesg log can not be
interleaved.

prefix is a bit misleading, perhaps level is better.

void __attribute__ ((format (printf, 3, 4))) 
fat_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.args = &args;

	printk("%sFAT-fs (%s): %pV\n", level, sb->s_id, &vaf);

	va_end(args);
}


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