linux-kernel - Re: [PATCH v2 3/3] staging: exfat: add millisecond support

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Message-ID: <20190908164040.GA8362@kroah.com>
Date:   Sun, 8 Sep 2019 17:40:40 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Valentin Vidic <vvidic@...entin-vidic.from.hr>
Cc:     devel@...verdev.osuosl.org,
        Valdis Kletnieks <valdis.kletnieks@...edu>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/3] staging: exfat: add millisecond support

On Sun, Sep 08, 2019 at 04:10:15PM +0000, Valentin Vidic wrote:
> Use create_time_ms modify_time_ms fields to store the millisecond
> part of the file timestamp with the precision of 10 ms.
> 
> Signed-off-by: Valentin Vidic <vvidic@...entin-vidic.from.hr>
> ---
>  drivers/staging/exfat/exfat_core.c | 30 ++++++++++++++++++++++++++++++
>  1 file changed, 30 insertions(+)
> 
> diff --git a/drivers/staging/exfat/exfat_core.c b/drivers/staging/exfat/exfat_core.c
> index 8476eeedba83..e87119fa8c0a 100644
> --- a/drivers/staging/exfat/exfat_core.c
> +++ b/drivers/staging/exfat/exfat_core.c
> @@ -1139,6 +1139,7 @@ void exfat_set_entry_size(struct dentry_t *p_entry, u64 size)
>  void fat_get_entry_time(struct dentry_t *p_entry, struct timestamp_t *tp,
>  			u8 mode)
>  {
> +	u8 ms = 0;
>  	u16 t = 0x00, d = 0x21;
>  	struct dos_dentry_t *ep = (struct dos_dentry_t *)p_entry;
>  
> @@ -1146,6 +1147,7 @@ void fat_get_entry_time(struct dentry_t *p_entry, struct timestamp_t *tp,
>  	case TM_CREATE:
>  		t = GET16_A(ep->create_time);
>  		d = GET16_A(ep->create_date);
> +		ms = ep->create_time_ms * 10;
>  		break;
>  	case TM_MODIFY:
>  		t = GET16_A(ep->modify_time);
> @@ -1159,11 +1161,17 @@ void fat_get_entry_time(struct dentry_t *p_entry, struct timestamp_t *tp,
>  	tp->day  = (d & 0x001F);
>  	tp->mon  = (d >> 5) & 0x000F;
>  	tp->year = (d >> 9);
> +
> +	if (ms >= 1000) {
> +		ms -= 1000;
> +		tp->sec++;
> +	}
>  }
>  
>  void exfat_get_entry_time(struct dentry_t *p_entry, struct timestamp_t *tp,
>  			  u8 mode)
>  {
> +	u8 ms = 0;
>  	u16 t = 0x00, d = 0x21;
>  	struct file_dentry_t *ep = (struct file_dentry_t *)p_entry;
>  
> @@ -1171,10 +1179,12 @@ void exfat_get_entry_time(struct dentry_t *p_entry, struct timestamp_t *tp,
>  	case TM_CREATE:
>  		t = GET16_A(ep->create_time);
>  		d = GET16_A(ep->create_date);
> +		ms = ep->create_time_ms * 10;
>  		break;
>  	case TM_MODIFY:
>  		t = GET16_A(ep->modify_time);
>  		d = GET16_A(ep->modify_date);
> +		ms = ep->modify_time_ms * 10;
>  		break;
>  	case TM_ACCESS:
>  		t = GET16_A(ep->access_time);
> @@ -1188,21 +1198,33 @@ void exfat_get_entry_time(struct dentry_t *p_entry, struct timestamp_t *tp,
>  	tp->day  = (d & 0x001F);
>  	tp->mon  = (d >> 5) & 0x000F;
>  	tp->year = (d >> 9);
> +
> +	if (ms >= 1000) {
> +		ms -= 1000;
> +		tp->sec++;
> +	}
>  }
>  
>  void fat_set_entry_time(struct dentry_t *p_entry, struct timestamp_t *tp,
>  			u8 mode)
>  {
> +	u8 ms;
>  	u16 t, d;
>  	struct dos_dentry_t *ep = (struct dos_dentry_t *)p_entry;
>  
>  	t = (tp->hour << 11) | (tp->min << 5) | (tp->sec >> 1);
>  	d = (tp->year <<  9) | (tp->mon << 5) |  tp->day;
>  
> +	ms = tp->millisec;
> +	if (tp->sec & 1) {
> +		ms += 1000;
> +	}

checkpatch didn't complain about this { } not being needed?

Same in other parts of this patch, please fix up.

thanks,

greg k-h