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From: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
To: Ross Zwisler
	<ross.zwisler-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>,
	Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>,
	Dave Chinner <david-FqsqvQoI3Ljby3iVrkZq2A@public.gmane.org>,
	linux-xfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-nvdimm-y27Ovi1pjclAfugRpC6u6w@public.gmane.org
Subject: Re: [PATCH 06/10] dax: provide an iomap based fault handler
Date: Wed, 14 Sep 2016 09:06:33 +0200	[thread overview]
Message-ID: <20160914070633.GA17278@lst.de> (raw)
In-Reply-To: <20160913155126.GA10622-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>

On Tue, Sep 13, 2016 at 09:51:26AM -0600, Ross Zwisler wrote:
> I'm working on this right now.  I expect that most/all of the infrastructure
> between the bh+get_block_t version and the iomap version to be shared, it'll
> just be a matter of having a PMD version of the iomap fault handler.  This
> should be pretty minor.

Yes, I looked at it (although I didn't do any work yet), and the work
should be fairly easy.

> Let's see how it goes, but right now my plan is to have both - I'd like to
> keep feature parity between ext2/ext4 and XFS, and that means having PMD
> faults in ext4 via bh+get_block_t until they move over to iomap.
> 
> Regarding coordination, the PMD v2 series hasn't gotten much review so far, so
> I'm not sure it'll go in for v4.9.  At this point I'm planning on just
> rebasing on top of your iomap series, though if it gets taken sooner I
> wouldn't object.

So let's do iomap first.  I've got stable ext2 support, as well as support
for the block device, although I'm not sure what the proper testing
protocol for that is.  I've started ext4 and read / zero was easy, but
now I'm stuck in the convoluted mess that is the ext4 direct I/O and
DAX path.

Maybe we should get the iomap work into 4.9 and then convert over ext4
as well as adding PMD fault support in the next release.

WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@lst.de>
To: Ross Zwisler <ross.zwisler@linux.intel.com>,
	Christoph Hellwig <hch@lst.de>,
	Dave Chinner <david@fromorbit.com>,
	linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	linux-nvdimm@ml01.01.org
Subject: Re: [PATCH 06/10] dax: provide an iomap based fault handler
Date: Wed, 14 Sep 2016 09:06:33 +0200	[thread overview]
Message-ID: <20160914070633.GA17278@lst.de> (raw)
In-Reply-To: <20160913155126.GA10622@linux.intel.com>

On Tue, Sep 13, 2016 at 09:51:26AM -0600, Ross Zwisler wrote:
> I'm working on this right now.  I expect that most/all of the infrastructure
> between the bh+get_block_t version and the iomap version to be shared, it'll
> just be a matter of having a PMD version of the iomap fault handler.  This
> should be pretty minor.

Yes, I looked at it (although I didn't do any work yet), and the work
should be fairly easy.

> Let's see how it goes, but right now my plan is to have both - I'd like to
> keep feature parity between ext2/ext4 and XFS, and that means having PMD
> faults in ext4 via bh+get_block_t until they move over to iomap.
> 
> Regarding coordination, the PMD v2 series hasn't gotten much review so far, so
> I'm not sure it'll go in for v4.9.  At this point I'm planning on just
> rebasing on top of your iomap series, though if it gets taken sooner I
> wouldn't object.

So let's do iomap first.  I've got stable ext2 support, as well as support
for the block device, although I'm not sure what the proper testing
protocol for that is.  I've started ext4 and read / zero was easy, but
now I'm stuck in the convoluted mess that is the ext4 direct I/O and
DAX path.

Maybe we should get the iomap work into 4.9 and then convert over ext4
as well as adding PMD fault support in the next release.

  parent reply	other threads:[~2016-09-14  7:06 UTC|newest]

Thread overview: 58+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-09-09 16:34 iomap based DAX path Christoph Hellwig
     [not found] ` <1473438884-674-1-git-send-email-hch-jcswGhMUV9g@public.gmane.org>
2016-09-09 16:34   ` [PATCH 01/10] iomap: add IOMAP_F_NEW flag Christoph Hellwig
2016-09-09 16:34     ` Christoph Hellwig
     [not found]     ` <1473438884-674-2-git-send-email-hch-jcswGhMUV9g@public.gmane.org>
2016-09-13 22:43       ` Ross Zwisler
2016-09-13 22:43         ` Ross Zwisler
2016-09-14  7:08         ` Christoph Hellwig
2016-09-09 16:34   ` [PATCH 02/10] iomap: expose iomap_apply outside iomap.c Christoph Hellwig
2016-09-09 16:34     ` Christoph Hellwig
     [not found]     ` <1473438884-674-3-git-send-email-hch-jcswGhMUV9g@public.gmane.org>
2016-09-13 22:48       ` Ross Zwisler
2016-09-13 22:48         ` Ross Zwisler
2016-09-09 16:34   ` [PATCH 03/10] dax: don't pass buffer_head to dax_insert_mapping Christoph Hellwig
2016-09-09 16:34     ` Christoph Hellwig
     [not found]     ` <1473438884-674-4-git-send-email-hch-jcswGhMUV9g@public.gmane.org>
2016-09-13 22:53       ` Ross Zwisler
2016-09-13 22:53         ` Ross Zwisler
2016-09-09 16:34   ` [PATCH 04/10] dax: don't pass buffer_head to copy_user_dax Christoph Hellwig
2016-09-09 16:34     ` Christoph Hellwig
2016-09-13 22:54     ` Ross Zwisler
2016-09-09 16:34   ` [PATCH 05/10] dax: provide an iomap based dax read/write path Christoph Hellwig
2016-09-09 16:34     ` Christoph Hellwig
     [not found]     ` <1473438884-674-6-git-send-email-hch-jcswGhMUV9g@public.gmane.org>
2016-09-13 23:00       ` Ross Zwisler
2016-09-13 23:00         ` Ross Zwisler
2016-09-09 16:34   ` [PATCH 06/10] dax: provide an iomap based fault handler Christoph Hellwig
2016-09-09 16:34     ` Christoph Hellwig
     [not found]     ` <1473438884-674-7-git-send-email-hch-jcswGhMUV9g@public.gmane.org>
2016-09-09 22:55       ` Dave Chinner
2016-09-09 22:55         ` Dave Chinner
2016-09-10  7:36         ` Christoph Hellwig
2016-09-10  7:36           ` Christoph Hellwig
2016-09-13 15:51           ` Ross Zwisler
     [not found]             ` <20160913155126.GA10622-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2016-09-14  7:06               ` Christoph Hellwig [this message]
2016-09-14  7:06                 ` Christoph Hellwig
     [not found]                 ` <20160914070633.GA17278-jcswGhMUV9g@public.gmane.org>
2016-09-14  9:53                   ` Christoph Hellwig
2016-09-14  9:53                     ` Christoph Hellwig
2016-09-23 21:02                   ` Ross Zwisler
2016-09-23 21:02                     ` Ross Zwisler
     [not found]                     ` <20160923210237.GA23346-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2016-09-26  0:08                       ` Christoph Hellwig
2016-09-26  0:08                         ` Christoph Hellwig
     [not found]                         ` <20160926000805.GA32252-jcswGhMUV9g@public.gmane.org>
2016-09-26 14:28                           ` Jan Kara
2016-09-26 14:28                             ` Jan Kara
2016-09-10  1:38       ` Elliott, Robert (Persistent Memory)
2016-09-10  1:38         ` Elliott, Robert (Persistent Memory)
2016-09-13 23:10     ` Ross Zwisler
     [not found]       ` <20160913231039.GF26002-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2016-09-14  7:19         ` Christoph Hellwig
2016-09-14  7:19           ` Christoph Hellwig
     [not found]           ` <20160914071910.GC17278-jcswGhMUV9g@public.gmane.org>
2016-09-14 17:07             ` Ross Zwisler
2016-09-14 17:07               ` Ross Zwisler
     [not found]               ` <20160914170759.GA14196-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2016-09-15  5:12                 ` Christoph Hellwig
2016-09-15  5:12                   ` Christoph Hellwig
     [not found]                   ` <20160915051229.GD6188-jcswGhMUV9g@public.gmane.org>
2016-09-15  5:30                     ` Darrick J. Wong
2016-09-15  5:30                       ` Darrick J. Wong
2016-09-26  0:05               ` Christoph Hellwig
2016-09-09 16:34   ` [PATCH 07/10] xfs: fix locking for DAX writes Christoph Hellwig
2016-09-09 16:34     ` Christoph Hellwig
2016-09-09 16:34   ` [PATCH 08/10] xfs: take the ilock shared if possible in xfs_file_iomap_begin Christoph Hellwig
2016-09-09 16:34     ` Christoph Hellwig
2016-09-09 16:34 ` [PATCH 09/10] xfs: refactor xfs_setfilesize Christoph Hellwig
     [not found]   ` <1473438884-674-10-git-send-email-hch-jcswGhMUV9g@public.gmane.org>
2016-09-13 23:12     ` Ross Zwisler
2016-09-13 23:12       ` Ross Zwisler
2016-09-09 16:34 ` [PATCH 10/10] xfs: use iomap to implement DAX Christoph Hellwig

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