From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH] ext4: introduce per-inode DAX flag
Date: Wed, 30 Aug 2017 05:34:50 -0700
Message-ID: <20170830123450.GA14976@infradead.org>
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Cc: Dave Chinner <david@fromorbit.com>,
        Christoph Hellwig <hch@infradead.org>,
        Theodore Ts'o <tytso@mit.edu>, linux-ext4@vger.kernel.org,
        Lukas Czerner <lczerner@redhat.com>, linux-xfs@vger.kernel.org
To: Jan Kara <jack@suse.cz>
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On Wed, Aug 30, 2017 at 12:00:59PM +0200, Jan Kara wrote:
> /dev/ram0 /mnt xfs rw,relatime,attr2,dax,inode64,noquota 0 0
> 
> marvin5:~/:[0]# ls /mnt/
> fsxfile  fsxfile.fsxgood  fsxfile.fsxlog
> 
> marvin5:~/:[0]# ./xfsprogs-dev/io/xfs_io -c 'lsattr' /mnt/fsxfile
> -p-------------- /mnt/fsxfile 
> 
> marvin5:~/:[0]# ./xfsprogs-dev/io/xfs_io -c 'chattr +x' /mnt/fsxfile
> 
> marvin5:~/:[0]# ./xfsprogs-dev/io/xfs_io -c 'lsattr' /mnt/fsxfile
> -p-------------- /mnt/fsxfile 
> 
> No DAX flag set and no error... What am I doing wrong?

Odd.  Even on a non-DAX device the flag sticks for me:

root@testvm:~# mount /dev/sda /mnt/
root@testvm:~# touch foo
root@testvm:~# cd /mnt/
root@testvm:/mnt# xfs_io -c 'chattr +x' foo
root@testvm:/mnt# xfs_io -c 'lsattr' foo
--------------x- foo