Merge patch series "mount: more bugfixes, trapped in the Black Lodge edition"

Christian Brauner <brauner@kernel.org> says:

More bugfixes from work in this area:

- unhash a dentry before detaching the mounts on it to avoid leaking
  sensitive data
- don't reveal overmounted entries in refwalk
- refuse F_SET_RW_HINT on an immutable inode
- refuse an automount below a mount that is in no namespace
- handle mount locking for automounts correctly
- don't update the access time on nullfs
- never expire a locked mount
- keep the lock on a mount that a propagated copy is moved beneath
- decide the subtree check under mount_lock
- keep the private nullfs instance in knullfs
- nothing is mounted on or written through knullfs
- let a filesystem refuse fsnotify marks on its objects
- refuse file locks on nullfs
- refuse leases and delegations on nullfs
- take no inode lock on an immutable directory

* patches from https://patch.msgid.link/20261002-work-mount-fixes-4-v1-0-dd44b89d44ce@kernel.org:
  selftests/filesystems: check that reading the root of an empty mount namespace stalls nobody
  selftests/filesystems: add a helper that holds a readdir in a page fault
  readdir: take no inode lock on an immutable directory
  nullfs: refuse file locks
  fsnotify: let a filesystem refuse marks on its objects
  namespace: nothing is mounted on or written through knullfs
  namespace: keep the private nullfs instance in knullfs
  fhandle: decide the subtree check under mount_lock
  selftests/filesystems: check that an automount below an overlay layer is refused
  selftests/filesystems: check the atime of the empty mount namespace root
  selftests/filesystems: check that a lock lands on the right mount and stays
  namespace: keep the lock on a mount that a propagated copy is moved beneath
  namespace: never expire a locked mount
  nullfs: don't update the access time
  namespace: handle mount locking for automounts correctly
  namespace: refuse an automount below a mount that is in no namespace
  selftests/filesystems: check that an immutable inode takes no write hint
  fcntl: refuse F_SET_RW_HINT on an immutable inode
  namei: don't reveal overmounted entries in refwalk
  namespace: unhash a dentry before detaching the mounts on it

Link: https://patch.msgid.link/20261002-work-mount-fixes-4-v1-0-dd44b89d44ce@kernel.org
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

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