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From:   Christoph Hellwig <hch@lst.de>
To:     Nitesh Shetty <nj.shetty@samsung.com>
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Subject: Re: [PATCH v13 1/9] block: Introduce queue limits for copy-offload
 support
Message-ID: <20230720075849.GA6246@lst.de>
References: <20230627183629.26571-1-nj.shetty@samsung.com> <CGME20230627184000epcas5p1c7cb01eb1c70bc5a19f76ce21f2ec3f8@epcas5p1.samsung.com> <20230627183629.26571-2-nj.shetty@samsung.com>
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> 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.