[Bug build/26338] io/tst-copy_file_range fails on RHEL 7.8 hosts

["fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=26338

--- Comment #7 from Florian Weimer <fweimer at redhat dot com> ---
Most file systems I looked at have something like this:

static ssize_t nfs4_copy_file_range(struct file *file_in, loff_t pos_in,
                                    struct file *file_out, loff_t pos_out,
                                    size_t count, unsigned int flags)
{
        ssize_t ret;

        ret = __nfs4_copy_file_range(file_in, pos_in, file_out, pos_out, count,
                                     flags);
        if (ret == -EOPNOTSUPP || ret == -EXDEV)
                ret = generic_copy_file_range(file_in, pos_in, file_out,
                                              pos_out, count, flags);
        return ret;
}

This masks the EOPNOTSUPP error from the native copy_file_range implementation
and calls generic_copy_file_range even if do_copy_file_range does not.

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