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Re: [dm-devel] REQUEST for new 'topology' metrics to be moved out of the 'queue' sysfs directory.
- From: Linus Torvalds <torvalds linux-foundation org>
- To: "Martin K. Petersen" <martin petersen oracle com>
- Cc: Mike Snitzer <snitzer redhat com>, linux-scsi vger kernel org, linux-kernel vger kernel org, linux-raid vger kernel org, linux-ide vger kernel org, device-mapper development <dm-devel redhat com>, jens axboe oracle com, linux-fsdevel vger kernel org, Alasdair G Kergon <agk redhat com>
- Subject: Re: [dm-devel] REQUEST for new 'topology' metrics to be moved out of the 'queue' sysfs directory.
- Date: Thu, 25 Jun 2009 10:46:41 -0700 (PDT)
On Thu, 25 Jun 2009, Martin K. Petersen wrote:
>
> Neil> So I asked git why it as added, and it pointed to
> Neil> commit 1308835ffffe6d61ad1f48c5c381c9cc47f683ec
>
> Neil> which suggests that it was added so that user space could tell the
> Neil> kernel whether the device was rotational, rather than the other
> Neil> way around.
>
> There's an option to do it via udev for broken devices that don't report
> it. But both SCSI and ATA have a setting that gets queried and the
> queue flag set accordingly.
.. except few devices actually set it.
That flag is _definitely_ all about the user being able to override it.
Linus
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