cp: Fix perm race #10030

Performance Regression: -46.76%

❌ 6 regressions
✅ 133 untouched
⏩ 37 skipped¹

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

	Benchmark	`BASE`	`HEAD`	Efficiency
❌	`cp_large_file[16]`	363.2 µs	386.2 µs	-5.96%
❌	`cp_preserve_metadata[(5, 4, 10)]`	75 ms	134.2 ms	-44.11%
❌	`cp_recursive_wide_tree[(6000, 800)]`	190 ms	356.8 ms	-46.76%
❌	`cp_recursive_deep_tree[(120, 4)]`	13.7 ms	21.7 ms	-36.91%
❌	`cp_archive_balanced_tree[(5, 4, 10)]`	77.9 ms	137.2 ms	-43.24%
❌	`cp_recursive_balanced_tree[(5, 4, 10)]`	72.4 ms	129.4 ms	-44.05%

37 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩