[GIT PULL] vfs fixes

[Christian Brauner]

/* Summary */
This contains fixes for this merge window:

cachefiles:
- Export an existing and add a new cachefile helper to be used in filesystems
  to fix reference count bugs.
- Use the newly added fscache_ty_get_volume() helper to get a reference count
  on an fscache_volume to handle volumes that are about to be removed cleanly.
- After withdrawing a fscache_cache via FSCACHE_CACHE_IS_WITHDRAWN wait for all
  ongoing cookie lookups to complete and for the object count to reach zero.
- Propagate errors from vfs_getxattr() to avoid an infinite loop in
  cachefiles_check_volume_xattr() because it keeps seeing ESTALE.
- Don't send new requests when an object is dropped by raising
  CACHEFILES_ONDEMAND_OJBSTATE_DROPPING.
- Cancel all requests for an object that is about to be dropped.
- Wait for the ondemand_boject_worker to finish before dropping a cachefiles
  object to prevent use-after-free.
- Use cyclic allocation for message ids to better handle id recycling.
- Add missing lock protection when iterating through the xarray when polling.

netfs:
- Use standard logging helpers for debug logging.

VFS:
- Fix potential use-after-free in file locks during trace_posix_lock_inode().
  The tracepoint could fire while another task raced it and freed the lock that
  was requested to be traced.
- Only increment the nr_dentry_negative counter for dentries that are present
  on the superblock LRU. Currently, DCACHE_LRU_LIST list is used to detect this
  case. However, the flag is also raised in combination with DCACHE_SHRINK_LIST
  to indicate that dentry->d_lru is used. So checking only DCACHE_LRU_LIST will
  lead to wrong nr_dentry_negative count. Fix the check to not count dentries
  that are on a shrink related list.

Misc:
- hfsplus: fix an uninitialized value issue in copy_name.
- minix: fix minixfs_rename with HIGHMEM. It still uses kunmap() even though we
  switched it to kmap_local_page() a while ago.

/* Testing */
clang: Debian clang version 16.0.6 (27)
gcc: (Debian 13.2.0-25) 13.2.0

All patches are based on v6.10-rc6. No build failures or warnings were observed.

/* Conflicts */
No known conflicts.

The following changes since commit 22a40d14b572deb80c0648557f4bd502d7e83826:

  Linux 6.10-rc6 (2024-06-30 14:40:44 -0700)

are available in the Git repository at:

  git@xxxxxxxxxxxxxxxxxxx:pub/scm/linux/kernel/git/vfs/vfs tags/vfs-6.10-rc8.fixes

for you to fetch changes up to 3d1bec293378700dddc087d4d862306702276c23:

  minixfs: Fix minixfs_rename with HIGHMEM (2024-07-10 07:15:36 +0200)

Please consider pulling these changes from the signed vfs-6.10-rc8.fixes tag.

Thanks!
Christian

----------------------------------------------------------------
vfs-6.10-rc8.fixes

----------------------------------------------------------------
Baokun Li (7):
      netfs, fscache: export fscache_put_volume() and add fscache_try_get_volume()
      cachefiles: fix slab-use-after-free in fscache_withdraw_volume()
      cachefiles: fix slab-use-after-free in cachefiles_withdraw_cookie()
      cachefiles: propagate errors from vfs_getxattr() to avoid infinite loop
      cachefiles: stop sending new request when dropping object
      cachefiles: cancel all requests for the object that is being dropped
      cachefiles: cyclic allocation of msg_id to avoid reuse

Brian Foster (1):
      vfs: don't mod negative dentry count when on shrinker list

Christian Brauner (1):
      Merge patch series "cachefiles: random bugfixes"

Edward Adam Davis (1):
      hfsplus: fix uninit-value in copy_name

Hou Tao (1):
      cachefiles: wait for ondemand_object_worker to finish when dropping object

Jeff Layton (1):
      filelock: fix potential use-after-free in posix_lock_inode

Jingbo Xu (1):
      cachefiles: add missing lock protection when polling

Matthew Wilcox (Oracle) (1):
      minixfs: Fix minixfs_rename with HIGHMEM

Uwe Kleine-König (1):
      netfs: Switch debug logging to pr_debug()

 fs/cachefiles/cache.c          | 45 +++++++++++++++++++++++++++++++++++-
 fs/cachefiles/daemon.c         |  4 ++--
 fs/cachefiles/internal.h       |  3 +++
 fs/cachefiles/ondemand.c       | 52 +++++++++++++++++++++++++++++++++++++-----
 fs/cachefiles/volume.c         |  1 -
 fs/cachefiles/xattr.c          |  5 +++-
 fs/dcache.c                    | 12 +++++++---
 fs/hfsplus/xattr.c             |  2 +-
 fs/locks.c                     |  2 +-
 fs/minix/namei.c               |  3 +--
 fs/netfs/buffered_read.c       | 14 ++++++------
 fs/netfs/buffered_write.c      | 12 +++++-----
 fs/netfs/direct_read.c         |  2 +-
 fs/netfs/direct_write.c        |  8 +++----
 fs/netfs/fscache_cache.c       |  4 ++--
 fs/netfs/fscache_cookie.c      | 28 +++++++++++------------
 fs/netfs/fscache_io.c          | 12 +++++-----
 fs/netfs/fscache_main.c        |  2 +-
 fs/netfs/fscache_volume.c      | 18 +++++++++++++--
 fs/netfs/internal.h            | 35 +---------------------------
 fs/netfs/io.c                  | 12 +++++-----
 fs/netfs/main.c                |  4 ----
 fs/netfs/misc.c                |  4 ++--
 fs/netfs/write_collect.c       | 16 ++++++-------
 fs/netfs/write_issue.c         | 36 ++++++++++++++---------------
 include/linux/fscache-cache.h  |  6 +++++
 include/trace/events/fscache.h |  4 ++++
 27 files changed, 213 insertions(+), 133 deletions(-)