From: Jeff Moyer <jmoyer@redhat.com>
To: Christoph Hellwig <hch@lst.de>, jhallida@redhat.com
Cc: Dave Chinner <david@fromorbit.com>,
ira.weiny@intel.com, linux-kernel@vger.kernel.org,
Alexander Viro <viro@zeniv.linux.org.uk>,
"Darrick J. Wong" <darrick.wong@oracle.com>,
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
Subject: Re: [PATCH V4 07/13] fs: Add locking for a dynamic address space operations state
Date: Tue, 25 Feb 2020 14:37:12 -0500 [thread overview]
Message-ID: <x49fteyh313.fsf@segfault.boston.devel.redhat.com> (raw)
In-Reply-To: <20200225173633.GA30843@lst.de> (Christoph Hellwig's message of "Tue, 25 Feb 2020 18:36:33 +0100")
Christoph Hellwig <hch@lst.de> writes:
> And my point is that if we ensure S_DAX can only be checked if there
> are no blocks on the file, is is fairly easy to provide the same
> guarantee. And I've not heard any argument that we really need more
> flexibility than that. In fact I think just being able to change it
> on the parent directory and inheriting the flag might be more than
> plenty, which would lead to a very simple implementation without any
> of the crazy overhead in this series.
I know of one user who had at least mentioned it to me, so I cc'd him.
Jonathan, can you describe your use case for being able to change a
file between dax and non-dax modes? Or, if I'm misremembering, just
correct me?
Thanks!
Jeff
next prev parent reply other threads:[~2020-02-25 19:37 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-21 0:41 [PATCH V4 00/13] Enable per-file/per-directory DAX operations V4 ira.weiny
2020-02-21 0:41 ` [PATCH V4 01/13] fs/xfs: Remove unnecessary initialization of i_rwsem ira.weiny
2020-02-21 1:26 ` Dave Chinner
2020-02-27 17:52 ` Ira Weiny
2020-02-21 0:41 ` [PATCH V4 02/13] fs/xfs: Clarify lockdep dependency for xfs_isilocked() ira.weiny
2020-02-21 1:34 ` Dave Chinner
2020-02-21 23:00 ` Ira Weiny
2020-02-21 0:41 ` [PATCH V4 03/13] fs: Remove unneeded IS_DAX() check ira.weiny
2020-02-21 1:42 ` Dave Chinner
2020-02-21 23:04 ` Ira Weiny
2020-02-21 17:42 ` Christoph Hellwig
2020-02-21 0:41 ` [PATCH V4 04/13] fs/stat: Define DAX statx attribute ira.weiny
2020-02-21 0:41 ` [PATCH V4 05/13] fs/xfs: Isolate the physical DAX flag from enabled ira.weiny
2020-02-21 0:41 ` [PATCH V4 06/13] fs/xfs: Create function xfs_inode_enable_dax() ira.weiny
2020-02-22 0:28 ` Darrick J. Wong
2020-02-23 15:07 ` Ira Weiny
2020-02-21 0:41 ` [PATCH V4 07/13] fs: Add locking for a dynamic address space operations state ira.weiny
2020-02-21 17:44 ` Christoph Hellwig
2020-02-21 22:44 ` Dave Chinner
2020-02-21 23:26 ` Dan Williams
2020-02-24 17:56 ` Christoph Hellwig
2020-02-25 0:09 ` Dave Chinner
2020-02-25 17:36 ` Christoph Hellwig
2020-02-25 19:37 ` Jeff Moyer [this message]
2020-02-26 9:28 ` Jonathan Halliday
2020-02-26 11:31 ` Jan Kara
2020-02-26 11:56 ` Jonathan Halliday
2020-02-26 16:10 ` Ira Weiny
2020-02-26 16:46 ` Dan Williams
2020-02-26 17:20 ` Jan Kara
2020-02-26 17:54 ` Dan Williams
2020-02-25 21:03 ` Ira Weiny
2020-02-26 11:17 ` Jan Kara
2020-02-26 15:57 ` Ira Weiny
2020-02-22 0:33 ` Darrick J. Wong
2020-02-23 15:03 ` Ira Weiny
2020-02-21 0:41 ` [PATCH V4 08/13] fs: Prevent DAX state change if file is mmap'ed ira.weiny
2020-02-21 0:41 ` [PATCH V4 09/13] fs/xfs: Add write aops lock to xfs layer ira.weiny
2020-02-22 0:31 ` Darrick J. Wong
2020-02-23 15:04 ` Ira Weiny
2020-02-24 0:34 ` Dave Chinner
2020-02-24 19:57 ` Ira Weiny
2020-02-24 22:32 ` Dave Chinner
2020-02-25 21:12 ` Ira Weiny
2020-02-25 22:59 ` Dave Chinner
2020-02-26 18:02 ` Ira Weiny
2020-02-21 0:41 ` [PATCH V4 10/13] fs/xfs: Clean up locking in dax invalidate ira.weiny
2020-02-21 17:45 ` Christoph Hellwig
2020-02-21 18:06 ` Ira Weiny
2020-02-21 0:41 ` [PATCH V4 11/13] fs/xfs: Allow toggle of effective DAX flag ira.weiny
2020-02-21 0:41 ` [PATCH V4 12/13] fs/xfs: Remove xfs_diflags_to_linux() ira.weiny
2020-02-21 0:41 ` [PATCH V4 13/13] Documentation/dax: Update Usage section ira.weiny
2020-02-26 22:48 ` [PATCH V4 00/13] Enable per-file/per-directory DAX operations V4 Jeff Moyer
2020-02-27 2:43 ` Ira Weiny
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