linux-kernel - Re: [PATCH] fat: print s_dev via fat

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Message-ID: <87frsjt9i2.fsf@mail.parknet.co.jp>
Date: Tue, 09 Jul 2024 14:33:25 +0900
From: OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
To: Sungjong Seo <sj1557.seo@...sung.com>
Cc: akpm@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fat: print s_dev via fat_msg

Sungjong Seo <sj1557.seo@...sung.com> writes:

> To clarify MAJOR/MINOR number of a mounted device, fat_msg prints prefix
> that includes them.

Hm, why do we need the major/minor (why can't use sysfs to resolve if
need), and why do you care only fat?

Thanks.

> Signed-off-by: Sungjong Seo <sj1557.seo@...sung.com>
> ---
>  fs/fat/fat.h  | 2 +-
>  fs/fat/misc.c | 4 +++-
>  2 files changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/fs/fat/fat.h b/fs/fat/fat.h
> index 66cf4778cf3b..538bcb3e28e1 100644
> --- a/fs/fat/fat.h
> +++ b/fs/fat/fat.h
> @@ -435,7 +435,7 @@ void __fat_fs_error(struct super_block *sb, int report, const char *fmt, ...);
>  #define fat_fs_error_ratelimit(sb, fmt, args...) \
>  	__fat_fs_error(sb, __ratelimit(&MSDOS_SB(sb)->ratelimit), fmt , ## args)
>  
> -#define FAT_PRINTK_PREFIX "%sFAT-fs (%s): "
> +#define FAT_PRINTK_PREFIX "%sFAT-fs (%s[%d:%d]): "
>  #define fat_msg(sb, level, fmt, args...)				\
>  do {									\
>  	printk_index_subsys_emit(FAT_PRINTK_PREFIX, level, fmt, ##args);\
> diff --git a/fs/fat/misc.c b/fs/fat/misc.c
> index c7a2d27120ba..6672cefc5484 100644
> --- a/fs/fat/misc.c
> +++ b/fs/fat/misc.c
> @@ -9,6 +9,7 @@
>  
>  #include "fat.h"
>  #include <linux/iversion.h>
> +#include <linux/blkdev.h>
>  
>  /*
>   * fat_fs_error reports a file system problem that might indicate fa data
> @@ -59,7 +60,8 @@ void _fat_msg(struct super_block *sb, const char *level, const char *fmt, ...)
>  	va_start(args, fmt);
>  	vaf.fmt = fmt;
>  	vaf.va = &args;
> -	_printk(FAT_PRINTK_PREFIX "%pV\n", level, sb->s_id, &vaf);
> +	_printk(FAT_PRINTK_PREFIX "%pV\n", level, sb->s_id,
> +		MAJOR(sb->s_dev), MINOR(sb->s_dev), &vaf);
>  	va_end(args);
>  }

-- 
OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>