linux-kernel - Re: [PATCH 12/20] fs: fat: Initialize filesystem timestamp ranges

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Message-ID: <878ssfc1id.fsf@mail.parknet.co.jp>
Date:   Tue, 30 Jul 2019 18:31:06 +0900
From:   OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
To:     Deepa Dinamani <deepa.kernel@...il.com>
Cc:     viro@...iv.linux.org.uk, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, arnd@...db.de,
        y2038@...ts.linaro.org
Subject: Re: [PATCH 12/20] fs: fat: Initialize filesystem timestamp ranges

Deepa Dinamani <deepa.kernel@...il.com> writes:

> +/* DOS dates from 1980/1/1 through 2107/12/31 */
> +#define FAT_DATE_MIN (0<<9 | 1<<5 | 1)
> +#define FAT_DATE_MAX (127<<9 | 12<<5 | 31)
> +#define FAT_TIME_MAX (23<<11 | 59<<5 | 29)
> +
>  /*
>   * A deserialized copy of the on-disk structure laid out in struct
>   * fat_boot_sector.
> @@ -1605,6 +1610,7 @@ int fat_fill_super(struct super_block *sb, void *data, int silent, int isvfat,
>  	int debug;
>  	long error;
>  	char buf[50];
> +	struct timespec64 ts;
>  
>  	/*
>  	 * GFP_KERNEL is ok here, because while we do hold the
> @@ -1698,6 +1704,12 @@ int fat_fill_super(struct super_block *sb, void *data, int silent, int isvfat,
>  	sbi->free_clus_valid = 0;
>  	sbi->prev_free = FAT_START_ENT;
>  	sb->s_maxbytes = 0xffffffff;
> +	fat_time_fat2unix(sbi, &ts, 0, cpu_to_le16(FAT_DATE_MIN), 0);
> +	sb->s_time_min = ts.tv_sec;
> +
> +	fat_time_fat2unix(sbi, &ts, cpu_to_le16(FAT_TIME_MAX),
> +			  cpu_to_le16(FAT_DATE_MAX), 0);
> +	sb->s_time_max = ts.tv_sec;

At least, it is wrong to call fat_time_fat2unix() before setup parameters
in sbi.

And please move those timestamp stuff to fat/misc.c like other fat
timestamp helpers. (Maybe, provide fat_time_{min,max}() from fat/misc.c,
or fat_init_time() such?).

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