[GIT PULL] vfs fixes

[Christian Brauner]

Hey Linus,

/* Summary */

This contains various fixes for this cycle:

- Fix fsnotify FMODE_NONOTIFY* handling.
  This also disables fsnotify on all pseudo files by default apart from
  very selection exceptions. This carries a regression risk so we need
  to watch out and adapt accordingly. However, it is overall a
  significant improvement over the current status quo where every rando
  file can get fsnotify enabled.

- Cleanup and simplify lockref_init() after recent lockref changes.

- Fix vboxfs build with gcc-15.

- Add an assert into inode_set_cached_link() to catch corrupt links.

- Allow users to also use an empty string check to detect whether a
  given mount option string was empty or not.

- Fix how security options were appended to statmount()'s ->mnt_opt field.

- Fix statmount() selftests to always check the returned mask.

- Fix uninitialized value in vfs_statx_path().

- Fix pidfs_ioctl() sanity checks to guard against ioctl() overloading
  and preserve extensibility.

/* Testing */

gcc version 14.2.0 (Debian 14.2.0-6)
Debian clang version 16.0.6 (27+b1)

No build failures or warnings were observed.

/* Conflicts */

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

No known conflicts.

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

No known conflicts.

The following changes since commit 2014c95afecee3e76ca4a56956a936e23283f05b:

  Linux 6.14-rc1 (2025-02-02 15:39:26 -0800)

are available in the Git repository at:

  git@xxxxxxxxxxxxxxxxxxx:pub/scm/linux/kernel/git/vfs/vfs tags/vfs-6.14-rc2.fixes

for you to fetch changes up to 37d11cfc63604b3886308e2111d845d148ced8bc:

  vfs: sanity check the length passed to inode_set_cached_link() (2025-02-07 10:29:59 +0100)

Please consider pulling these changes from the signed vfs-6.14-rc2.fixes tag.

Thanks!
Christian

----------------------------------------------------------------
vfs-6.14-rc2.fixes

----------------------------------------------------------------
Amir Goldstein (3):
      fsnotify: use accessor to set FMODE_NONOTIFY_*
      fsnotify: disable notification by default for all pseudo files
      fsnotify: disable pre-content and permission events by default

Andreas Gruenbacher (3):
      gfs2: use lockref_init for gl_lockref
      gfs2: switch to lockref_init(..., 1)
      lockref: remove count argument of lockref_init

Brahmajit Das (1):
      vboxsf: fix building with GCC 15

Christian Brauner (3):
      Merge patch series "further lockref cleanups"
      Merge patch series "Fix for huge faults regression"
      pidfs: improve ioctl handling

Mateusz Guzik (1):
      vfs: sanity check the length passed to inode_set_cached_link()

Miklos Szeredi (3):
      statmount: let unset strings be empty
      fs: fix adding security options to statmount.mnt_opt
      selftests: always check mask returned by statmount(2)

Su Hui (1):
      fs/stat.c: avoid harmless garbage value problem in vfs_statx_path()

 drivers/tty/pty.c                                  |  2 +-
 fs/dcache.c                                        |  2 +-
 fs/erofs/zdata.c                                   |  2 +-
 fs/file_table.c                                    | 16 +++++++
 fs/gfs2/glock.c                                    |  2 +-
 fs/gfs2/main.c                                     |  1 -
 fs/gfs2/quota.c                                    |  4 +-
 fs/namespace.c                                     | 54 ++++++++++++----------
 fs/notify/fsnotify.c                               | 18 +++++---
 fs/open.c                                          | 11 +++--
 fs/pidfs.c                                         | 12 ++++-
 fs/pipe.c                                          |  6 +++
 fs/stat.c                                          |  4 +-
 fs/vboxsf/super.c                                  |  3 +-
 include/linux/fs.h                                 | 20 +++++++-
 include/linux/fsnotify.h                           |  4 +-
 include/linux/lockref.h                            |  7 +--
 net/socket.c                                       |  5 ++
 .../filesystems/statmount/statmount_test.c         | 22 ++++++++-
 19 files changed, 143 insertions(+), 52 deletions(-)