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The copy_file_range system call seems to be the only one that can return an off64_t value. Use FUSE to exercise this, without actually creating such large files or copying any data. Due to FUSE protocol limitations, only sizes up to UINT_MAX can be tested, but this is sufficient to check for the presence of bug 33245. The FUSE protocol limitations are raised here: copy_file_range return value on FUSE <https://lore.kernel.org/all/lhuh5ynl8z5.fsf@oldenburg.str.redhat.com/> Reviewed-by: Sam James <sam@gentoo.org> Reviewed-by: Collin Funk <collin.funk1@gmail.com>