linux-kernel - Re: [PATCH] fat: Simplify calc_fat

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Date:	Wed, 03 Sep 2014 00:37:29 +0900
From:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
To:	Seunghun Lee <waydi1@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] fat: Simplify calc_fat_clusters code

Seunghun Lee <waydi1@...il.com> writes:

> diff --git a/fs/fat/inode.c b/fs/fat/inode.c
> index 756aead..6992dea 100644
> --- a/fs/fat/inode.c
> +++ b/fs/fat/inode.c
> @@ -1307,12 +1307,9 @@ static unsigned long calc_fat_clusters(struct super_block *sb)
>  	struct msdos_sb_info *sbi = MSDOS_SB(sb);
>  
>  	/* Divide first to avoid overflow */
> -	if (sbi->fat_bits != 12) {
> -		unsigned long ent_per_sec = sb->s_blocksize * 8 / sbi->fat_bits;
> -		return ent_per_sec * sbi->fat_length;
> -	}
> +	unsigned long ent_per_sec = sb->s_blocksize * 8 / sbi->fat_bits;
>  
> -	return sbi->fat_length * sb->s_blocksize * 8 / sbi->fat_bits;
> +	return ent_per_sec * sbi->fat_length;
>  }

When sbi->fat_bits == 12, it doesn't work, right? (there is the remainder)

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