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Date:   Tue, 11 Feb 2020 16:57:45 +1100
From:   Dave Chinner <>
        Alexander Viro <>,
        "Darrick J. Wong" <>,
        Dan Williams <>,
        Christoph Hellwig <>,
        "Theodore Y. Ts'o" <>, Jan Kara <>,,,
Subject: Re: [PATCH v3 04/12] fs/xfs: Clean up DAX support check

On Sat, Feb 08, 2020 at 11:34:37AM -0800, wrote:
> From: Ira Weiny <>
> Rather than open coding xfs_inode_supports_dax() in
> xfs_ioctl_setattr_dax_invalidate() export xfs_inode_supports_dax() and
> call it in preparation for swapping dax flags.
> This also means updating xfs_inode_supports_dax() to return true for a
> directory.

That's not correct. This now means S_DAX gets set on directory inodes
because both xfs_inode_supports_dax() and the on-disk inode flag
checks return true in xfs_diflags_to_iflags(). Hence when we
instantiate a directory inode with a DAX inherit hint set on it
we'll set S_DAX on the inode and so IS_DAX() will return true for
directory inodes...


Dave Chinner

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