[GIT PULL] vfs fixes

[Christian Brauner <brauner@kernel.org>]

Hey Linus,

/* Summary */

This contains a few fixes for this cycle:

- Remove incorrect __user annotation from struct xattr_args::value.

- Documentation fix: Add missing kernel-doc description for the @isnew
  parameter in ilookup5_nowait() to silence Sphinx warnings.

- Documentation fix: Fix kernel-doc comment for __start_dirop() - the
  function name in the comment was wrong and the @state parameter was
  undocumented.

- Replace dynamic folio_batch allocation with stack allocation in
  iomap_zero_range(). The dynamic allocation was problematic for ext4-on-iomap
  work (didn't handle allocation failure properly) and triggered lockdep
  complaints. Uses a flag instead to control batch usage.

- Re-add #ifdef guards around PIDFD_GET_<ns-type>_NAMESPACE ioctls. When a
  namespace type is disabled, ns->ops is NULL, causes crashes during inode
  eviction when closing the fd. The ifdefs were removed in a recent
  simplification but are still needed.

- Fixe a race where a folio could be unlocked before the trailing zeros (for
  EOF within the page) were written.

- Split out a dedicated lease_dispose_list() helper since lease code paths
  always know they're disposing of leases. Removes unnecessary runtime flag
  checks and prepares for upcoming lease_manager enhancements.

- Fix userland delegation requests succeeding despite conflicting opens.
  Previously, FL_LAYOUT and FL_DELEG leases bypassed conflict checks (a hack
  for nfsd). Adds new ->lm_open_conflict() lease_manager operation so userland
  delegations get proper conflict checking while nfsd can continue its own
  conflict handling.

- Fix LOOKUP_CACHED path lookups incorrectly falling through to the slow
  path. After legitimize_links() calls were conditionally elided, the routine
  would always fail with LOOKUP_CACHED regardless of whether there were any
  links. Now the flag is checked at the two callsites before calling
  legitimize_links().

- Fix bug in media fd allocation in media_request_alloc().

- Fix mismatched API calls in ecryptfs_mknod(): was calling end_removing()
  instead of end_creating() after ecryptfs_start_creating_dentry().

- Fix dentry reference count leak in ecryptfs_mkdir(): a dget() of the
  lower parent dir was added but never dput()'d, causing BUG during lower
  filesystem unmount due to the still-in-use dentry.

/* Conflicts */

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

No known conflicts.

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

No known conflicts.

The following changes since commit 8f0b4cce4481fb22653697cced8d0d04027cb1e8:

  Linux 6.19-rc1 (2025-12-14 16:05:07 +1200)

are available in the Git repository at:

  git@gitolite.kernel.org:pub/scm/linux/kernel/git/vfs/vfs tags/vfs-6.19-rc5.fixes

for you to fetch changes up to 75ddaa4ddc86d31edb15e50152adf4ddee77a6ba:

  pidfs: protect PIDFD_GET_* ioctls() via ifdef (2026-01-06 23:08:12 +0100)

Please consider pulling these changes from the signed vfs-6.19-rc5.fixes tag.

Thanks!
Christian

----------------------------------------------------------------
vfs-6.19-rc5.fixes

----------------------------------------------------------------
Al Viro (1):
      get rid of bogus __user in struct xattr_args::value

Bagas Sanjaya (2):
      fs: Describe @isnew parameter in ilookup5_nowait()
      VFS: fix __start_dirop() kernel-doc warnings

Brian Foster (1):
      iomap: replace folio_batch allocation with stack allocation

Christian Brauner (3):
      Merge patch series "filelock: fix conflict detection with userland file delegations"
      Merge patch series "Fix two regressions from start_creating()/start_removing() conversion"
      pidfs: protect PIDFD_GET_* ioctls() via ifdef

David Howells (1):
      netfs: Fix early read unlock of page with EOF in middle

Jeff Layton (2):
      filelock: add lease_dispose_list() helper
      filelock: allow lease_managers to dictate what qualifies as a conflict

Mateusz Guzik (1):
      fs: make sure to fail try_to_unlazy() and try_to_unlazy() for LOOKUP_CACHED

Mathias Krause (1):
      media: mc: fix potential use-after-free in media_request_alloc()

Tyler Hicks (2):
      ecryptfs: Fix improper mknod pairing of start_creating()/end_removing()
      ecryptfs: Release lower parent dentry after creating dir

 Documentation/filesystems/locking.rst |   1 +
 drivers/media/mc/mc-request.c         |   6 +-
 fs/ecryptfs/inode.c                   |   3 +-
 fs/inode.c                            |   3 +
 fs/iomap/buffered-io.c                |  50 +++++++++-----
 fs/iomap/iter.c                       |   6 +-
 fs/locks.c                            | 119 +++++++++++++++++-----------------
 fs/namei.c                            |  21 ++++--
 fs/netfs/read_collect.c               |   2 +-
 fs/nfsd/nfs4layouts.c                 |  23 ++++++-
 fs/nfsd/nfs4state.c                   |  19 ++++++
 fs/pidfs.c                            |  18 +++++
 fs/xfs/xfs_iomap.c                    |  11 ++--
 include/linux/filelock.h              |   1 +
 include/linux/iomap.h                 |   8 ++-
 include/uapi/linux/xattr.h            |   2 +-
 16 files changed, 196 insertions(+), 97 deletions(-)