Merge patch series "CONFIG_DEBUG_VFS at last"

Mateusz Guzik <mjguzik@gmail.com> says:

This adds a super basic version just to get the mechanism going, along
with sample usage.

The macro set is incomplete (e.g., lack of locking macros) and
dump_inode routine fails to dump any state yet, to be implemented(tm).

I think despite the primitive state this is complete enough to start
sprinkling asserts as necessary.

* patches from https://lore.kernel.org/r/20250209185523.745956-1-mjguzik@gmail.com:
  vfs: use the new debug macros in inode_set_cached_link()
  vfs: catch invalid modes in may_open()
  vfs: add initial support for CONFIG_DEBUG_VFS

Link: https://lore.kernel.org/r/20250209185523.745956-1-mjguzik@gmail.com
Signed-off-by: Christian Brauner <brauner@kernel.org>