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

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Message-ID: <20101109175617.GA28008@pengutronix.de>
Date:	Tue, 9 Nov 2010 18:56:17 +0100
From:	Wolfram Sang <w.sang@...gutronix.de>
To:	Joe Perches <joe@...ches.com>
Cc:	Alexey Fisher <bug-track@...her-privat.net>,
	linux-kernel@...r.kernel.org,
	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
Subject: Re: [PATCH 1/2] Introduce fat_msg() for unified kernel messages

Hi Joe,

On Tue, Nov 09, 2010 at 09:25:41AM -0800, Joe Perches wrote:
> 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.

Note that this routine was almost 1:1 taken from ext2, it seems (which is a
sensible approach), so these issues are present more than once.

Regards,

   Wolfram

-- 
Pengutronix e.K.                           | Wolfram Sang                |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

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