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

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Message-ID: <595589CF.5010605@hpe.com>
Date:   Thu, 29 Jun 2017 19:14:23 -0400
From:   Linda Knippers <linda.knippers@....com>
To:     Dan Williams <dan.j.williams@...el.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 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.

-- ljk