linux-kernel - Re: [PATCH] block: export SSD/non-rotational queue flag through sysfs

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Date:	Mon, 5 Jan 2009 19:54:29 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [PATCH] block: export SSD/non-rotational queue flag through sysfs

On Mon, Jan 05 2009, Bartlomiej Zolnierkiewicz wrote:
> From: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
> Subject: [PATCH] block: export SSD/non-rotational queue flag through sysfs
> 
> For some devices (i.e. CFA ATA) we can't reliably detect whether
> the device is of rotational or non-rotational type so we need to
> leave the final decision about this setting to the user-space.

I agree with that, was actually planning on doing that myself.

> @@ -146,8 +167,8 @@ static ssize_t queue_nomerges_store(stru
>  		queue_flag_set(QUEUE_FLAG_NOMERGES, q);
>  	else
>  		queue_flag_clear(QUEUE_FLAG_NOMERGES, q);
> -
>  	spin_unlock_irq(q->queue_lock);
> +
>  	return ret;
>  }
>  

Hmm?

> @@ -210,6 +231,12 @@ static struct queue_sysfs_entry queue_hw
>  	.show = queue_hw_sector_size_show,
>  };
>  
> +static struct queue_sysfs_entry queue_nonrot_entry = {
> +	.attr = {.name = "nonrot", .mode = S_IRUGO | S_IWUSR },
> +	.show = queue_nonrot_show,
> +	.store = queue_nonrot_store,
> +};
> +

Lets please use a better name for export reasons, non-rotational is a
lot better. Nobody will know what nonrot means :-)

-- 
Jens Axboe

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