linux-kernel - Re: [PATCH v4 12/16] libnvdimm, nfit: enable support for volatile ranges

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Message-ID: <CAPcyv4iTaXc92ggQcBnqJ=P0jsMF9HhnV4nAsr1Qos4pjrRDLA@mail.gmail.com>
Date:   Thu, 29 Jun 2017 18:28:14 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Linda Knippers <linda.knippers@....com>
Cc:     "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
        Jan Kara <jack@...e.cz>,
        Matthew Wilcox <mawilcox@...rosoft.com>,
        X86 ML <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v4 12/16] libnvdimm, nfit: enable support for volatile ranges

On Thu, Jun 29, 2017 at 4:14 PM, Linda Knippers <linda.knippers@....com> wrote:
> On 06/29/2017 06:58 PM, Dan Williams wrote:
>> On Thu, Jun 29, 2017 at 3:49 PM, Linda Knippers <linda.knippers@....com> wrote:
>>>> The parent region of the namespace will have a 'volatile' type:
>>>>
>>>> # cat /sys/bus/nd/devices/region0/devtype
>>>> nd_volatile
>>>
>>>
>>> If all I know is the /dev/pmem device name, how do I find that?
>>>
>>
>>     cat $(readlink -f /sys/block/pmem0/device)/../devtype
>>
>> ...this is where 'ndctl list' will get the information.
>>
>
> Thanks.
>
> I think we need a section 4 pmem manpage like exists for
> mem, sd, fd, md, etc., where we can put stuff like this, as well
> as providing some overview information that will point people to
> other resources.  I'll give that some thought unless there is one
> already that I'm not finding.
>

A "pmem" man page sounds like a great idea, I wasn't aware we even had
an sd man page.