[Bug 266611] copy_file_range does not copy all the way to RLIMIT_FSIZE

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=266611

            Bug ID: 266611
           Summary: copy_file_range does not copy all the way to
                    RLIMIT_FSIZE
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: asomers@FreeBSD.org

Bug #164793 addressed the problem that VOP_WRITE, with a range that crossed the
RLIMIT_FSIZE limit, did not write all the way up to that limit, as required by
POSIX.  Rather, it would write nothing and return EFBIG.

VOP_COPY_FILE_RANGE has the same problem.  While POSIX does not specify
copy_file_range, I think its behavior should match.

Do you all agree?

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