linux-kernel - Re: Reminder for feature libata spindown skipping and warning removal date Dec 2008

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Date:	Fri, 03 Jul 2009 11:49:37 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Jaswinder Singh Rajput <jaswinder@...nel.org>
CC:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Reminder for feature libata spindown skipping and warning removal
 date Dec 2008

Jaswinder Singh Rajput wrote:
> Hello Tejun,
> 
> What: libata spindown skipping and warning
> When: Dec 2008
> Why:  Some halt(8) implementations synchronize caches for and spin
>       down libata disks because libata didn't use to spin down disk on
>       system halt (only synchronized caches).
>       Spin down on system halt is now implemented.  sysfs node
>       /sys/class/scsi_disk/h:c:i:l/manage_start_stop is present if
>       spin down support is available.
>       Because issuing spin down command to an already spun down disk
>       makes some disks spin up just to spin down again, libata tracks
>       device spindown status to skip the extra spindown command and
>       warn about it.
>       This is to give userspace tools the time to get updated and will
>       be removed after userspace is reasonably updated.
> Who:  Tejun Heo <htejun@...il.com>
> 
> If you are facing any issue regarding feature removal kindly update the
> "Documentation/feature-removal-schedule.txt" like what you are waiting
> for.

Thanks for the reminder.  Just sent out patch to kill the feature.  :-)

-- 
tejun
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