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From: Ira Weiny <ira.weiny@intel.com>
To: Dave Chinner <david@fromorbit.com>
Cc: linux-kernel@vger.kernel.org,
	"Darrick J. Wong" <darrick.wong@oracle.com>,
	Dan Williams <dan.j.williams@intel.com>,
	Christoph Hellwig <hch@lst.de>,
	"Theodore Y. Ts'o" <tytso@mit.edu>, Jan Kara <jack@suse.cz>,
	Jeff Moyer <jmoyer@redhat.com>,
	linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org,
	linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH V6 4/8] fs/xfs: Make DAX mount option a tri-state
Date: Thu, 9 Apr 2020 08:03:32 -0700	[thread overview]
Message-ID: <20200409150331.GG664132@iweiny-DESK2.sc.intel.com> (raw)
In-Reply-To: <20200408004801.GH24067@dread.disaster.area>

On Wed, Apr 08, 2020 at 10:48:01AM +1000, Dave Chinner wrote:
> On Tue, Apr 07, 2020 at 05:09:04PM -0700, Ira Weiny wrote:
> > On Wed, Apr 08, 2020 at 09:59:09AM +1000, Dave Chinner wrote:
> > > 
> > > This is overly complex. Just use 2 flags:
> > 
> > LOL...  I was afraid someone would say that.  At first I used 2 flags with
> > fsparam_string, but then I realized Darrick suggested fsparam_enum:
> 
> Well, I'm not concerned about the fsparam enum, it's just that
> encoding an integer into a flags bit field is just ... messy.
> Especially when encoding that state can be done with just 2 flags.
> 
> If you want to keep the xfs_mount_dax_mode() wrapper, then:
> 
> static inline uint32_t xfs_mount_dax_mode(struct xfs_mount *mp)
> {
> 	if (mp->m_flags & XFS_MOUNT_DAX_NEVER)
> 		return XFS_DAX_NEVER;
> 	if (mp->m_flags & XFS_MOUNT_DAX_ALWAYS)
> 		return XFS_DAX_ALWAYS;
> 	return XFS_DAX_IFLAG;
> }
> 
> but once it's encoded in flags like this, the wrapper really isn't
> necessary...

Done for v7

> 
> Also, while I think of it, can we change "iflag" to "inode". i.e.
> the DAX state is held on the inode. Saying it comes from an "inode
> flag" encodes the implementation into the user interface. i.e. it
> could well be held in an xattr on the inode on another filesystem,
> so we shouldn't mention "flag" in the user API....

Sure "inode" is fine with me.  Easy change, done for v7

Ira


  reply	other threads:[~2020-04-09 15:03 UTC|newest]

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-07 18:29 [PATCH V6 0/8] Enable per-file/per-directory DAX operations V6 ira.weiny
2020-04-07 18:29 ` [PATCH V6 1/8] fs/xfs: Remove unnecessary initialization of i_rwsem ira.weiny
2020-04-07 23:46   ` Dave Chinner
2020-04-07 18:29 ` [PATCH V6 2/8] fs: Remove unneeded IS_DAX() check ira.weiny
2020-04-09  7:31   ` Christoph Hellwig
2020-04-09 14:57     ` Ira Weiny
2020-04-07 18:29 ` [PATCH V6 3/8] fs/stat: Define DAX statx attribute ira.weiny
2020-04-07 23:47   ` Dave Chinner
2020-04-07 18:29 ` [PATCH V6 4/8] fs/xfs: Make DAX mount option a tri-state ira.weiny
2020-04-07 23:59   ` Dave Chinner
2020-04-08  0:09     ` Ira Weiny
2020-04-08  0:48       ` Dave Chinner
2020-04-09 15:03         ` Ira Weiny [this message]
2020-04-07 18:29 ` [PATCH V6 5/8] fs/xfs: Create function xfs_inode_enable_dax() ira.weiny
2020-04-08  0:05   ` Dave Chinner
2020-04-08  0:13     ` Ira Weiny
2020-04-07 18:29 ` [PATCH V6 6/8] fs/xfs: Combine xfs_diflags_to_linux() and xfs_diflags_to_iflags() ira.weiny
2020-04-08  2:08   ` Dave Chinner
2020-04-08 17:09     ` Ira Weiny
2020-04-08 21:02       ` Dave Chinner
2020-04-08 21:28         ` Dan Williams
2020-04-08 22:10           ` Ira Weiny
2020-04-08 23:58           ` Dave Chinner
2020-04-09  0:22             ` Ira Weiny
2020-04-09 12:41               ` Christoph Hellwig
2020-04-09 20:49                 ` Ira Weiny
2020-04-08 22:07         ` Ira Weiny
2020-04-08 23:21           ` Dave Chinner
2020-04-09  0:12             ` Ira Weiny
2020-04-09  0:30               ` Darrick J. Wong
2020-04-09 15:29                 ` Ira Weiny
2020-04-09 16:59                   ` Darrick J. Wong
2020-04-09 17:17                     ` Jan Kara
2020-04-09 20:54                     ` Ira Weiny
2020-04-09  0:49               ` Dave Chinner
2020-04-09 12:40                 ` Christoph Hellwig
2020-04-10  0:27                   ` Dave Chinner
2020-04-07 18:29 ` [PATCH V6 7/8] fs/xfs: Change xfs_ioctl_setattr_dax_invalidate() to xfs_ioctl_dax_check() ira.weiny
2020-04-08  2:23   ` Dave Chinner
2020-04-08  9:58     ` Jan Kara
2020-04-08 21:09       ` Dave Chinner
2020-04-08 22:26         ` Ira Weiny
2020-04-08 23:48           ` Dave Chinner
2020-04-09 12:28             ` Christoph Hellwig
2020-04-08 15:37   ` Darrick J. Wong
2020-04-08 18:13     ` Ira Weiny
2020-04-16  5:39   ` [fs/xfs] 857c9841f8: xfstests.xfs.046.fail kernel test robot
2020-04-07 18:29 ` [PATCH V6 8/8] Documentation/dax: Update Usage section ira.weiny

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