linux-kernel - Re: [PATCH 02/15] libnvdimm: infrastructure for btt devices

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Date:	Tue, 23 Jun 2015 13:33:44 -0700
From:	Dan Williams <dan.j.williams@...el.com>
To:	Christoph Hellwig <hch@....de>
Cc:	Jeff Moyer <jmoyer@...hat.com>, Jens Axboe <axboe@...nel.dk>,
	"linux-nvdimm@...ts.01.org" <linux-nvdimm@...1.01.org>,
	Neil Brown <neilb@...e.de>,
	Greg KH <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Linux ACPI <linux-acpi@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH 02/15] libnvdimm: infrastructure for btt devices

On Tue, Jun 23, 2015 at 8:19 AM, Dan Williams <dan.j.williams@...el.com> wrote:
> On Tue, Jun 23, 2015 at 3:19 AM, Christoph Hellwig <hch@....de> wrote:
>> On Mon, Jun 22, 2015 at 12:02:54PM -0700, Dan Williams wrote:
>>> I don't see the need to re-invent partitioning which is the path this
>>> requested rework is putting us on...
>>>
>>> However, when the need arises for smaller granularity BTT we can have
>>> the partition fight then.  To be clear, I believe that need is already
>>> here today, but I'm not in a position to push that agenda at this late
>>> date.
>>
>>
>> Instead of all this complaining and moaning let's figure out what
>> architecture you'd actually want.  The one I had in mind is:
>>
>> +------------------------------+
>> |  block layer (& partitions)  |
>> +---------------+--------------+--------------------+
>> |  pmem driver  |  btt driver  |  other consumers   |
>> +---------------+--------------+--------------------+
>> |        pmem API through libnvdimm                 |
>> +---------------------------------------------------+
>>
>
> I've got this mostly coded up.  The nice property is that BTTs now
> become another flavor of the same namespace.

This approach has grown on me since yesterday.  I neglected to realize
that we can carve out a BLK-mode namespace to be a BTT enabled log
device if the need arises to satisfy what BTT on a partition was doing
previously.
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