[GIT PULL 12/12 for v6.18] async directory preliminaries

[Christian Brauner <brauner@kernel.org>]

Hey Linus,

/* Summary */
This contains further preparatory changes for the asynchronous directory
locking scheme:

* Add lookup_one_positive_killable() which allows overlayfs to perform
  lookup that won't block on a fatal signal.

* Unify the mount idmap handling in struct renamedata as a rename can
  only happen within a single mount.

* Introduce kern_path_parent() for audit which sets the path to the
  parent and returns a dentry for the target without holding any locks
  on return.

* Rename kern_path_locked() as it is only used to prepare for the
  removal of an object from the filesystem:

   kern_path_locked()    => start_removing_path()
   kern_path_create()    => start_creating_path()
   user_path_create()    => start_creating_user_path()
   user_path_locked_at() => start_removing_user_path_at()
   done_path_create()    => end_creating_path()
   NA                    => end_removing_path()

/* Testing */

gcc (Debian 14.2.0-19) 14.2.0
Debian clang version 19.1.7 (3+b1)

No build failures or warnings were observed.

/* Conflicts */

Merge conflicts with mainline
=============================

No known conflicts.

Merge conflicts with other trees
================================

[1] https://lore.kernel.org/linux-next/aNOyrz1bd1WTrZgc@finisterre.sirena.org.uk

[2] https://lore.kernel.org/linux-next/aNU3FtEZ3w_NcYwI@sirena.org.uk

The following changes since commit 8f5ae30d69d7543eee0d70083daf4de8fe15d585:

  Linux 6.17-rc1 (2025-08-10 19:41:16 +0300)

are available in the Git repository at:

  git@gitolite.kernel.org:pub/scm/linux/kernel/git/vfs/vfs tags/vfs-6.18-rc1.async

for you to fetch changes up to 4f5ea5aa0dcdd3c7487fbabad5b86b3cd7d2b8c4:

  Merge patch series "vfs: preparatory changes to centralize locking of create/remove/rename" (2025-09-23 12:37:42 +0200)

Please consider pulling these changes from the signed vfs-6.18-rc1.async tag.

Thanks!
Christian

----------------------------------------------------------------
vfs-6.18-rc1.async

----------------------------------------------------------------
Christian Brauner (1):
      Merge patch series "vfs: preparatory changes to centralize locking of create/remove/rename"

NeilBrown (6):
      VFS/ovl: add lookup_one_positive_killable()
      VFS: discard err2 in filename_create()
      VFS: unify old_mnt_idmap and new_mnt_idmap in renamedata
      VFS/audit: introduce kern_path_parent() for audit
      VFS: rename kern_path_locked() and related functions.
      debugfs: rename start_creating() to debugfs_start_creating()

 Documentation/filesystems/porting.rst        |  12 ++
 arch/powerpc/platforms/cell/spufs/syscalls.c |   4 +-
 drivers/base/devtmpfs.c                      |  22 ++--
 fs/bcachefs/fs-ioctl.c                       |  10 +-
 fs/cachefiles/namei.c                        |   3 +-
 fs/debugfs/inode.c                           |  11 +-
 fs/ecryptfs/inode.c                          |   3 +-
 fs/init.c                                    |  17 +--
 fs/namei.c                                   | 164 ++++++++++++++++++++-------
 fs/nfsd/vfs.c                                |   3 +-
 fs/ocfs2/refcounttree.c                      |   4 +-
 fs/overlayfs/overlayfs.h                     |   3 +-
 fs/overlayfs/readdir.c                       |  28 ++---
 fs/smb/server/vfs.c                          |  11 +-
 include/linux/fs.h                           |   6 +-
 include/linux/namei.h                        |  21 ++--
 kernel/audit_fsnotify.c                      |  11 +-
 kernel/audit_watch.c                         |   3 +-
 kernel/bpf/inode.c                           |   4 +-
 net/unix/af_unix.c                           |   6 +-
 20 files changed, 216 insertions(+), 130 deletions(-)