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From: "Darrick J. Wong" <darrick.wong@oracle.com>
To: Dave Chinner <david@fromorbit.com>
Cc: Christoph Hellwig <hch@lst.de>, Ira Weiny <ira.weiny@intel.com>,
	linux-kernel@vger.kernel.org,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	Dan Williams <dan.j.williams@intel.com>,
	"Theodore Y. Ts'o" <tytso@mit.edu>, Jan Kara <jack@suse.cz>,
	linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org,
	linux-fsdevel@vger.kernel.org, akpm@linux-foundation.org,
	torvalds@linux-foundation.org
Subject: Re: [PATCH V5 00/12] Enable per-file/per-directory DAX operations V5
Date: Wed, 11 Mar 2020 20:00:09 -0700 (PDT)
Message-ID: <20200312030009.GJ8045@magnolia> (raw)
In-Reply-To: <20200312004932.GH10776@dread.disaster.area>

On Thu, Mar 12, 2020 at 11:49:32AM +1100, Dave Chinner wrote:
> On Wed, Mar 11, 2020 at 07:44:12AM +0100, Christoph Hellwig wrote:
> > On Wed, Mar 11, 2020 at 05:39:42PM +1100, Dave Chinner wrote:
> > > IOWs, the dax_associate_page() related functionality probably needs
> > > to be a filesystem callout - part of the aops vector, I think, so
> > > that device dax can still use it. That way XFS can go it's own way,
> > > while ext4 and device dax can continue to use the existing mechanism
> > > mechanisn that is currently implemented....
> > 
> > s/XFS/XFS with rmap/, as most XFS file systems currently don't have
> > that enabled we'll also need to keep the legacy path around.
> 
> Sure, that's trivially easy to handle in the XFS code once the
> callouts are in place.
> 
> But, quite frankly, we can enforce rmap to be enabled 
> enabled because nobody is using a reflink enabled FS w/ DAX right
> now. Everyone will have to mkfs their filesystems anyway to enable
> reflink+dax, so we simply don't allow reflink+dax to be enabled
> unless rmap is also enabled. Simple, easy, trivial.

Heh, this reminds me that I need to get that rmap performance analysis
report out to the list... it does have a fairly substantial performance
impact (in its current not-terribly-optimized state) but otoh enables
self-repair.

--D

> Cheers,
> 
> Dave.
> -- 
> Dave Chinner
> david@fromorbit.com

  reply index

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-27  5:24 ira.weiny
2020-02-27  5:24 ` [PATCH V5 01/12] fs/xfs: Remove unnecessary initialization of i_rwsem ira.weiny
2020-02-27 17:25   ` Ira Weiny
2020-02-27  5:24 ` [PATCH V5 02/12] fs: Remove unneeded IS_DAX() check ira.weiny
2020-02-27  5:24 ` [PATCH V5 03/12] fs/stat: Define DAX statx attribute ira.weiny
2020-02-27  5:24 ` [PATCH V5 04/12] fs/xfs: Isolate the physical DAX flag from enabled ira.weiny
2020-02-27  5:24 ` [PATCH V5 05/12] fs/xfs: Create function xfs_inode_enable_dax() ira.weiny
2020-03-01 22:37   ` Dave Chinner
2020-02-27  5:24 ` [PATCH V5 06/12] fs: Add locking for a dynamic address space operations state ira.weiny
2020-03-02  1:26   ` Dave Chinner
2020-03-02  1:36     ` Dave Chinner
2020-02-27  5:24 ` [PATCH V5 07/12] fs: Prevent DAX state change if file is mmap'ed ira.weiny
2020-02-27  5:24 ` [PATCH V5 08/12] fs/xfs: Hold off aops users while changing DAX state ira.weiny
2020-02-27  5:24 ` [PATCH V5 09/12] fs/xfs: Clean up locking in dax invalidate ira.weiny
2020-02-27  5:24 ` [PATCH V5 10/12] fs/xfs: Allow toggle of effective DAX flag ira.weiny
2020-02-27  5:24 ` [PATCH V5 11/12] fs/xfs: Remove xfs_diflags_to_linux() ira.weiny
2020-02-27  5:24 ` [PATCH V5 12/12] Documentation/dax: Update Usage section ira.weiny
2020-03-05 15:51 ` [PATCH V5 00/12] Enable per-file/per-directory DAX operations V5 Christoph Hellwig
2020-03-09 17:04   ` Ira Weiny
2020-03-11  3:36     ` Darrick J. Wong
2020-03-11  6:29       ` Christoph Hellwig
2020-03-11 17:07         ` Dan Williams
2020-03-16  9:52           ` Jan Kara
2020-03-16  9:55             ` Christoph Hellwig
2020-04-01  4:00               ` Darrick J. Wong
2020-04-01 10:25                 ` Jan Kara
2020-04-02  8:53                   ` Christoph Hellwig
2020-04-02 20:55                     ` Ira Weiny
2020-04-03  7:27                       ` Christoph Hellwig
2020-04-03 15:48                         ` Ira Weiny
2020-04-03 17:03                           ` Jan Kara
2020-04-03 18:18                             ` Ira Weiny
2020-04-03 18:21                               ` Ira Weiny
2020-04-03 18:37                               ` Darrick J. Wong
2020-04-05  6:19                                 ` Ira Weiny
2020-04-06 10:00                               ` Jan Kara
2020-04-03 18:29                             ` Darrick J. Wong
2020-04-03 16:05                         ` Darrick J. Wong
2020-04-03  4:39                 ` Ira Weiny
2020-03-11  6:39       ` Dave Chinner
2020-03-11  6:44         ` Christoph Hellwig
2020-03-11 17:07           ` Dan Williams
2020-03-12  0:49           ` Dave Chinner
2020-03-12  3:00             ` Darrick J. Wong [this message]
2020-03-12  7:27             ` Christoph Hellwig

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