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From: "NeilBrown" <neilb@suse.de>
To: "Jens Axboe" <jens.axboe@oracle.com>
Date: Fri, 26 Jun 2009 23:16:59 +1000 (EST)
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Subject: Re: [dm-devel] REQUEST for new 'topology' metrics to be moved out 
     of the 'queue' sysfs directory.
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>,
       "Mike Snitzer" <snitzer@redhat.com>,
       "Linus Torvalds" <torvalds@linux-foundation.org>,
       "Alasdair G Kergon" <agk@redhat.com>, linux-scsi@vger.kernel.org,
       linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org,
       linux-ide@vger.kernel.org, linux-fsdevel@vger.kernel.org,
       "device-mapper development" <dm-devel@redhat.com>
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On Fri, June 26, 2009 10:50 pm, Jens Axboe wrote:
> On Fri, Jun 26 2009, Neil Brown wrote:

>> But for now, please please please can we revert the change which made
>> 'queue' appear in md and dm devices, (and loop and ...) and put these
>> generic values somewhere ... generic?
>
> No we cannot, not without a time machine. 2.6.30 is released, so it's
> too late to revert things like that, even if we wanted.

Drat... for some reason I was thinking that it only came in in 2.6.31-rc.
However it is only documented in ABI/testing, not ABI/stable ... if there
is any value in that distinction, then it should be possible to move it??

Well, maybe I'm too late.
If I send you a patch to remove all those fields in 'queue' that are not
relevant to md/dm (when the queue is used for an md/dm device) would that
be OK ??

NeilBrown