> diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h
> index b7b56871029c..dff56813f95a 100644
> --- a/include/uapi/linux/fs.h
> +++ b/include/uapi/linux/fs.h
> @@ -64,6 +64,9 @@ struct fstrim_range {
> __u64 minlen;
> };
>
> +/* maximum copy offload length, this is set to 128MB based on current
> testing */
> +#define COPY_MAX_BYTES (1 << 27)
This should not be in the UAPI. It is a totally arbitrary internal
limit.
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