linux-kernel - Re: [PATCH 14/15] libnvdimm: support read-only btt backing devices

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Message-ID: <x497fqvv9rq.fsf@segfault.boston.devel.redhat.com>
Date:	Mon, 22 Jun 2015 15:11:05 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...nel.dk>,
	"linux-nvdimm\@lists.01.org" <linux-nvdimm@...1.01.org>,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux ACPI <linux-acpi@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH 14/15] libnvdimm: support read-only btt backing devices

Dan Williams <dan.j.williams@...el.com> writes:

>>> Direct I/O using application can make assumption if they know the sector
>>> size, and we must have a way for them to be able to see our new
>>> "subsector sector size".
>>
>> You need to let them determine that when NOT using the btt, yes.  Right
>> now, I don't think there's a way to determine what the underlying atomic
>> write unit is.  That's something the NFIT spec probably should have
>> defined.
>
> There are no atomic write units for NFIT to advertise beyond cpu register width.

That would be useful information for the platform to provide, instead of
requiring the o/s or applications to infer it.

Cheers,
Jeff
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