linux-ext4 - Re: [PATCH 17/17] xfs: support for synchronous DAX faults

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Message-ID: <20171027064301.GC22931@lst.de>
Date:   Fri, 27 Oct 2017 08:43:01 +0200
From:   Christoph Hellwig <hch@....de>
To:     Jan Kara <jack@...e.cz>
Cc:     Dave Chinner <david@...morbit.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        Christoph Hellwig <hch@...radead.org>,
        linux-ext4@...r.kernel.org, linux-nvdimm@...ts.01.org,
        linux-fsdevel@...r.kernel.org, linux-xfs@...r.kernel.org,
        linux-api@...r.kernel.org, linux-mm@...ck.org,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH 17/17] xfs: support for synchronous DAX faults

On Thu, Oct 26, 2017 at 05:48:04PM +0200, Jan Kara wrote:
> But now that I look at XFS implementation again, it misses handling
> of VM_FAULT_NEEDSYNC in xfs_filemap_pfn_mkwrite() (ext4 gets this right).
> I'll fix this by using __xfs_filemap_fault() for xfs_filemap_pfn_mkwrite()
> as well since it mostly duplicates it anyway... Thanks for inquiring!

My first patches move xfs_filemap_pfn_mkwrite to use __xfs_filemap_fault,
but that didn't work.  Wish I'd remember why, though.