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Date: Fri, 20 Feb 2009 14:23:38 +0100
Message-ID: <ac3eb2510902200523o619e64aas7bffac9aeca86814@mail.gmail.com>
Subject: Re: General question (scheduler) with SSDs?
From: Kay Sievers <kay.sievers@vrfy.org>
To: Sitsofe Wheeler <sitsofe@yahoo.com>
Cc: Justin Piszcz <jpiszcz@lucidpixels.com>, linux-kernel@vger.kernel.org,
       linux-ide@vger.kernel.org, linux-raid@vger.kernel.org
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On Fri, Feb 20, 2009 at 14:12, Sitsofe Wheeler <sitsofe@yahoo.com> wrote:
> On Fri, Feb 20, 2009 at 12:16:42PM +0100, Kay Sievers wrote:
>>
>> Udev can write to the attribute itself. This should be all you need:
>>   SUSBSYTEM=="block", ATTRS{model}=="ASUS-PHISON *", ATTR{queue/rotational}="1"
>
> I tried
> SUBSYSTEM=="block", ATTRS{model}=="ASUS-PHISON *", ATTR{queue/rotational}="0"
> but udevtest /sys/block/sda/ doesn't list it as firing (udev 117-8)...

I does here:
  udev_rules_apply_to_event: ATTR '/sys/devices/ ...
/sdb/queue/rotational' writing '0'

  $grep . /sys/class/block/*/queue/rotational
  /sys/class/block/sda/queue/rotational:1
  /sys/class/block/sdb/queue/rotational:0

Maybe "udevtest" is not showing it for you, or udev 117 is too old and
does not work that way.

Thanks,
Kay