Merge tag 'vfs-7.4-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

Pull misc vfs updates from Christian Brauner:
 "Fixes:

   - aio: a keyed poll completion on an epoll instance could recurse
     into the same epoll waitqueue lock when the result eventfd is
     watched by that very instance. An unprivileged process could make a
     CPU spin on the recursive lock. eventfd-backed poll completions are
     always deferred now.

   - fsnotify_inoderemove() is only called once the inode is really
     dead, no nlink and no aliases, and open_by_handle_at() can't add an
     alias to a dead inode anymore. The race could crash fsnotify or
     lose inode mark notifications.

   - devtmpfs: the conversion of the public instance to ->get_tree()
     broke reconfiguring the shared superblock's options on later mounts
     which made the boot time defaults permanent. A reconfigure context
     is kept in fc->fs_private so the parse ops can forward options to
     the underlying filesystem.

   - ufs truncated the 64-bit directory size to an unsigned int in
     ufs_last_byte(). A crafted image with a 4 GiB directory produced an
     out-of-folio read in ufs_find_entry() and, with
     CONFIG_UFS_FS_WRITE, a write into an adjacent page.

   - devpts rejects max=0 instead of silently lifting the per-instance
     pty limit. The value wrapped into ida_alloc_max() and became
     unlimited.

   - fs_pin publishes pins with the rcu list helpers so the kill paths
     reading the lists under rcu see the initialization.

   - dentry_kill() reports a Tasks-RCU quiescent state. Its
     cond_resched() is the only reschedule point on the dentry teardown
     path and cond_resched() isn't a quiescent state for Tasks-RCU, so
     Meta kept seeing rcu_tasks stalls in btrfs subvolume deletion.

   - writeback sizes foreign flushes by the target wb's dirty pages
     instead of the memcg-wide count which over or undersized a single
     bdi flush.

   - nfsd READ emitted two fsnotify access events on the iterator path
     since vfs_iocb_iter_read() already sends one. A READ on a krb5i or
     krb5p mount showed up twice in inotify.

   - pipe and splice pass a poll key when waking readers and writers so
     epoll, poll() and select() waiters only wake for the event they
     asked for.

   - the iso8859-14 Unicode to charset tables had page01 duplicated as
     page1e so 29 code points mapped to the wrong bytes and 22 that
     aren't in the charset were accepted.

   - orangefs doesn't wait for an unmount service operation that never
     returns on system shutdown and uses ssize_t for strscpy() errors.

   - __register_chrdev() checks the kobject_set_name() return value.

   - selftest fixes: the openat2 tests hardcoded O_LARGEFILE to 0x8000
     which is O_NOFOLLOW on powerpc, resolve_test makes /tmp a
     mountpoint so RESOLVE_NO_XDEV has a boundary to trip over,
     file_stressor moves into its own directory with a 30 minute
     timeout, the kernfs listxattr test skips when SELinux exposes
     security.selinux, the namespaces active reference tests wait for
     the thread via a PIDFD_THREAD pidfd since pthread_join() returns
     before exit_nsproxy_namespaces(), the idmapped_tmpfile test chowns
     its directory into the mapped range, the clone3 CLONE_CLEAR_SIGHAND
     test adds CLONE_VM so it fails for the intended reason, the pidfd
     PPID error message prints the values it compares and fscontext_ns
     gets a .gitignore.

  Cleanups:

   - vmcore prints the release of the crashed kernel from the VMCOREINFO
     note so a kdump that dies before the dump lands still says which
     kernel it was for.

   - initramfs allocates hardlink hash entries with the validated cpio
     name length instead of PATH_MAX, which put every entry in
     kmalloc-8k.

   - the unused dax_layout_busy_page() is removed,
     dax_layout_busy_page_range() becomes static and dax_folio_init()
     drops a redundant list initialization.

   - vfs_empty_path() is removed, it has had no callers since
     getname_maybe_null().

   - comment and documentation fixes in aio, bpf_fs_kfuncs,
     fs-writeback, inode, read_write, squashfs and the vfs.rst copy of
     struct file_system_type"

* tag 'vfs-7.4-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs: (38 commits)
  selftests/filesystems: Fix idmapped_tmpfile layer dir ownership
  selftests/namespaces: Wait for thread exit via pidfd in active-ref tests
  writeback: size foreign flushes by target wb dirty pages
  initramfs: Reduce hardlink hash allocation sizes
  fs: remove unused vfs_empty_path()
  dcache: report a Tasks-RCU quiescent state in dentry_kill()
  vmcore: report the release of the crashed kernel
  splice: pass a poll key when waking pipe readers and writers
  pipe: pass a poll key when waking writers after a resize
  orangefs: use ssize_t instead of size_t for error codes...
  orangefs_super: don't wait on service operation on system shutdown.
  docs/vfs: Fix the struct file_system_type copy
  nls: fix the Unicode to charset tables of iso8859-14
  selftests/filesystems/openat2: make /tmp a mountpoint inside private namespace
  selftests/filesystems/openat2: fix O_LARGEFILE definitions for non-arm64 architectures
  fs: fix misleading comments in read_write.c
  squashfs: fix inode number description in documentation
  fs: fix typos in comments
  fs/dax: Make dax_layout_busy_page_range() static
  fs/dax: Remove unused dax_layout_busy_page()
  ...

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