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SubjectRe: [PATCH v2 09/10] fs/xfs: Handle CoW for fsdax write() path
On Wed, Mar 03, 2021 at 09:57:48AM +0000, ruansy.fnst@fujitsu.com wrote:
> > What is the advantage of the ioemap_end handler here? It adds another
> > indirect funtion call to the fast path, so if we can avoid it, I'd
> > rather do that.
>
> These code were in xfs_file_dax_write(). I moved them into the iomap_end
> because the mmaped CoW need this.
>
> I know this is not so good, but I could not find another better way. Do you
> have any ideas?

mmaped copy is the copy_edge case? Maybe just use different iomap_ops for
that case vs plain write?

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