Directory recursion

Question

If you need to recursively traverse a directory tree, there are two ways to do it:

1. Build up pathnames of increasing length as you go, .../.../... etc.

Answer 1

The method 2 seemlessly handles situations where a component in the path is renamed.

It also denies anyone from unmounting the directory while it's being searched; the kernel will refuse to unmount the directory if it's in use, which includes being the cwd of some process.