[PATCH] copy_file_range: New function to copy file data

[Florian Weimer]

The attached version of the patch fixes a few 32-bit issues in the code 
(non-64 functions being called, and size_t-to-off64_t conversion issue). 
  I renamed the -common.c file into -compat.c, for consistency with how 
the file is used.

It also drops the zero-as-ENOSPC special case Andreas recognized as 
unnecessary.

Thanks,
Florian
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