linux-kernel - Re: what's in nvdimm.git for v4.4?

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Message-ID: <CAPcyv4hBV=tsEmNajuMXr8Jj7-+ovT7FP3yWrfDLZVWejgA2ig@mail.gmail.com>
Date:	Tue, 20 Oct 2015 17:31:18 -0700
From:	Dan Williams <dan.j.williams@...el.com>
To:	Dave Chinner <david@...morbit.com>
Cc:	"axboe@...com" <axboe@...com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"hch@....de" <hch@....de>,
	"martin.petersen@...cle.com" <martin.petersen@...cle.com>,
	"linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"jack@...e.cz" <jack@...e.cz>
Subject: Re: what's in nvdimm.git for v4.4?

On Tue, Oct 20, 2015 at 5:01 PM, Dave Chinner <david@...morbit.com> wrote:
> On Tue, Oct 20, 2015 at 11:31:45PM +0000, Williams, Dan J wrote:
>> Here is a status summary of the topic-branches nvdimm.git is tracking
>> for v4.4.  Unless indicated these branches are not present in -next.
>> Please ACK, NAK, or ask for a re-post of any of the below to disposition
>> it for the merge window.
>>
>> ===
>> for-4.4/dax-fixes:
>> ===
> ...
>>         Dave Chinner (5):
>>               xfs: fix inode size update overflow in xfs_map_direct()
>>               xfs: introduce BMAPI_ZERO for allocating zeroed extents
>>               xfs: Don't use unwritten extents for DAX
>>               xfs: DAX does not use IO completion callbacks
>>               xfs: add ->pfn_mkwrite support for DAX
>
> Please drop these. They have not been reviewed yet, and because
> the changes affect more than just DAX (core XFS allocator
> functionality was changed) these need to go through the XFS tree.
>

Ok, thanks for the heads up.  For the get_user_pages() patches that
build on these fixes I'm assuming your review bandwidth is in short
supply to also give an XFS sign-off on those changes for 4.4?

I'm wondering if we can take a conservative step forward with those
patches for 4.4.  if XFS and EXT4 interactions need more time to get
worked out, which I believe they do, I can conceive just turning on
get_user_pages() support for DAX-mappings of the raw block device.
This would be via the new facility I posted yesterday:
https://lists.01.org/pipermail/linux-nvdimm/2015-October/002512.html.
While not very functional for applications it makes testing base DAX
mechanisms straightforward.
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