Simplify copy-reflink code

[Ralph Boehme]

On 4/5/24 12:54, David Disseldorp wrote:
> Interesting, thanks! What about unaligned lengths when it covers the end
> of a file?

In my testing with btrfs it seems btrfs allows this if it covers the 
*complete* last chunk of the file, eg from an strace of a copy a file of 
4160 bytes:

ioctl(33, FICLONERANGE, {src_fd=32, src_offset=4096, src_length=64, 
dest_offset=4096}) = 0

Both offsets are aligned and src_offset + src_length is the file size, 
so it works.

But according to the customer this may not be the case with ZFS, still 
digging...

Thanks!
-slow
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