[GIT PULL] vfs misc

[Christian Brauner <brauner@kernel.org>]

Hey Linus,

/* Summary */

Features:

- Add CONFIG_DEBUG_VFS infrastucture:

  - Catch invalid modes in open.

  - Use the new debug macros in inode_set_cached_link().

  - Use debug-only asserts around fd allocation and install.

- Place f_ref to 3rd cache line in struct file to resolve false sharing.

Cleanups:

- Start using anon_inode_getfile_fmode() helper in various places.

- Don't take f_lock during SEEK_CUR if exclusion is guaranteed by f_pos_lock.

- Add unlikely() to kcmp().

- Remove legacy ->remount_fs method from ecryptfs after port to the new mount api.

- Remove invalidate_inodes() in favour of evict_inodes().

- Simplify ep_busy_loopER by removing unused argument.

- Avoid mmap sem relocks when coredumping with many missing pages.

- Inline getname().

- Inline new_inode_pseudo() and de-staticize alloc_inode().

- Dodge an atomic in putname if ref == 1.

- Consistently deref the files table with rcu_dereference_raw().

- Dedup handling of struct filename init and refcounts bumps.

- Use wq_has_sleeper() in end_dir_add().

- Drop the lock trip around I_NEW wake up in evict().

- Load the ->i_sb pointer once in inode_sb_list_{add,del}.

- Predict not reaching the limit in alloc_empty_file().

- Tidy up do_sys_openat2() with likely/unlikely.

- Call inode_sb_list_add() outside of inode hash lock.

- Sort out fd allocation vs dup2 race commentary.

- Turn page_offset() into a wrapper around folio_pos().

- Remove locking in exportfs around ->get_parent() call.

- try_lookup_one_len() does not need any locks in autofs.

- Fix return type of several functions from long to int in open.

- Fix return type of several functions from long to int in ioctls.

Fixes:

- Fix watch queue accounting mismatch.

/* 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
=============================

This contains a minor merge conflict for include/linux/fs.h.

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@gitolite.kernel.org:pub/scm/linux/kernel/git/vfs/vfs tags/vfs-6.15-rc1.misc

for you to fetch changes up to 4dec4f91359c456a5eea26817ea151b42953432e:

  fs: sort out fd allocation vs dup2 race commentary, take 2 (2025-03-20 15:17:56 +0100)

Please consider pulling these changes from the signed vfs-6.15-rc1.misc tag.

Thanks!
Christian

----------------------------------------------------------------
vfs-6.15-rc1.misc

----------------------------------------------------------------
Al Viro (1):
      make use of anon_inode_getfile_fmode()

Christian Brauner (3):
      Merge patch series "CONFIG_DEBUG_VFS at last"
      Merge patch series "Fix the return type of several functions from long to int"
      fs: don't needlessly acquire f_lock

Colin Ian King (1):
      kcmp: improve performance adding an unlikely hint to task comparisons

Eric Sandeen (2):
      watch_queue: fix pipe accounting mismatch
      ecryptfs: remove NULL remount_fs from super_operations

Jan Kara (1):
      vfs: Remove invalidate_inodes()

Lin Feng (1):
      epoll: simplify ep_busy_loop by removing always 0 argument

Mateusz Guzik (17):
      vfs: add initial support for CONFIG_DEBUG_VFS
      vfs: catch invalid modes in may_open()
      vfs: use the new debug macros in inode_set_cached_link()
      fs: avoid mmap sem relocks when coredumping with many missing pages
      vfs: inline getname()
      vfs: inline new_inode_pseudo() and de-staticize alloc_inode()
      fs: dodge an atomic in putname if ref == 1
      fs: use debug-only asserts around fd allocation and install
      fs: consistently deref the files table with rcu_dereference_raw()
      fs: dedup handling of struct filename init and refcounts bumps
      fs: use wq_has_sleeper() in end_dir_add()
      fs: drop the lock trip around I_NEW wake up in evict()
      fs: load the ->i_sb pointer once in inode_sb_list_{add,del}
      fs: predict not reaching the limit in alloc_empty_file()
      fs: tidy up do_sys_openat2() with likely/unlikely
      fs: call inode_sb_list_add() outside of inode hash lock
      fs: sort out fd allocation vs dup2 race commentary, take 2

Matthew Wilcox (Oracle) (1):
      fs: Turn page_offset() into a wrapper around folio_pos()

NeilBrown (2):
      exportfs: remove locking around ->get_parent() call.
      VFS/autofs: try_lookup_one_len() does not need any locks

Pan Deng (1):
      fs: place f_ref to 3rd cache line in struct file to resolve false sharing

Yuichiro Tsuji (2):
      open: Fix return type of several functions from long to int
      ioctl: Fix return type of several functions from long to int

 Documentation/filesystems/porting.rst     |   5 ++
 arch/arm64/kernel/elfcore.c               |   3 +-
 arch/powerpc/platforms/pseries/papr-vpd.c |   7 +-
 drivers/vfio/group.c                      |  16 +---
 fs/autofs/dev-ioctl.c                     |   3 -
 fs/cachefiles/ondemand.c                  |   7 +-
 fs/coredump.c                             |  38 +++++++--
 fs/dcache.c                               |   3 +-
 fs/ecryptfs/super.c                       |   1 -
 fs/eventfd.c                              |   5 +-
 fs/eventpoll.c                            |   8 +-
 fs/exportfs/expfs.c                       |   2 -
 fs/file.c                                 |  81 +++++++++++++------
 fs/file_table.c                           |   3 +-
 fs/inode.c                                | 127 +++++++++++-------------------
 fs/internal.h                             |   6 +-
 fs/ioctl.c                                |  10 +--
 fs/namei.c                                |  42 +++++-----
 fs/open.c                                 |  29 +++----
 fs/read_write.c                           |  13 ++-
 fs/signalfd.c                             |   7 +-
 fs/smb/client/file.c                      |   2 +-
 fs/super.c                                |   2 +-
 fs/timerfd.c                              |   6 +-
 include/linux/fs.h                        |  36 ++++++---
 include/linux/mm.h                        |   2 +-
 include/linux/pagemap.h                   |  20 ++---
 include/linux/syscalls.h                  |   4 +-
 include/linux/vfsdebug.h                  |  45 +++++++++++
 kernel/auditsc.c                          |  12 ++-
 kernel/kcmp.c                             |   2 +-
 kernel/watch_queue.c                      |   9 +++
 lib/Kconfig.debug                         |   9 +++
 mm/gup.c                                  |   6 +-
 security/landlock/fs.c                    |   2 +-
 virt/kvm/kvm_main.c                       |  11 +--
 36 files changed, 339 insertions(+), 245 deletions(-)
 create mode 100644 include/linux/vfsdebug.h