Merge patch series "Minor cleanup preparation for some dir-locking API changes"

NeilBrown <neil@brown.name> says:

The following 4 patches provide further cleanup that serves as
preparation for some dir-locking API changes that I want to make.

* patches from https://lore.kernel.org/20250608230952.20539-1-neil@brown.name:
  exportfs: use lookup_one_unlocked()
  coda: use iterate_dir() in coda_readdir()
  VFS: Minor fixes for porting.rst
  VFS: merge lookup_one_qstr_excl_raw() back into lookup_one_qstr_excl()

Link: https://lore.kernel.org/20250608230952.20539-1-neil@brown.name
Signed-off-by: Christian Brauner <brauner@kernel.org>