Re: [PATCH] xfs: fix confused tracepoints in xfs_reflink_end_atomic_cow()

[John Garry]

On 24/11/2025 09:34, Christoph Hellwig wrote:
> On Fri, Nov 21, 2025 at 07:56:56PM +0800, alexjlzheng@xxxxxxxxx wrote:
> > From: Jinliang Zheng <alexjlzheng@xxxxxxxxxxx>
> >
> > The commit b1e09178b73a ("xfs: commit CoW-based atomic writes atomically")
> > introduced xfs_reflink_end_atomic_cow() for atomic CoW-based writes, but
> > it used the same tracepoint as xfs_reflink_end_cow(), making trace logs
> > ambiguous.
> >
> > This patch adds two new tracepoints trace_xfs_reflink_end_atomic_cow() and
> > trace_xfs_reflink_end_atomic_cow_error() to distinguish them.
>
> Confused sounds a bit strong, 

Yeah, maybe "ambiguous" could be a better word.

FWIW,

Reviewed-by: John Garry <john.g.garry@xxxxxxxxxx>

> but otherwise this looks good:
>
> Reviewed-by: Christoph Hellwig <hch@xxxxxx>
>
> Semi-related:  back when this code was added I asked why we're not
> using the transaction / defer ops chaining even for normale reflink
> completions, as it should be just as efficient and that way we have
> less code to maintain and less diverging code paths.  Or am I missing
> something?

Commit d6f215f35963 might be able to explain that.