[git pull] vfs.git next portion of mount stuff

[Al Viro <viro@zeniv.linux.org.uk>]

	The rest of core infrastructure; no new syscalls in that pile,
but the old parts are switched to new infrastructure.  At that point
conversions of individual filesystems can happen independently; some
are done here (afs, cgroup, procfs, etc.), there's also a large series
outside of that pile dealing with NFS (quite a bit of option-parsing
stuff is getting used there - it's one of the most convoluted
filesystems in terms of mount-related logics), but NFS bits are
the next cycle fodder.

	It got seriously simplified since the last cycle; documentation is
probably the weakest bit at the moment - I considered dropping the
commit introducing Documentation/filesystems/mount_api.txt (cutting
the size increase by quarter ;-), but decided that it would be better
to fix it up after -rc1 instead.

	That pile allows to do followup work in independent branches,
which should make life much easier for the next cycle.  fs/super.c
size increase is unpleasant; there's a followup series that allows to
shrink it considerably, but I decided to leave that until the next
cycle.

	Two trivial conflicts (fs/Makefile and include/linux/kernfs.h),
both as straighforward as it gets.  Sat in -next for weeks; the only
change after it went there had been the removal of rather obnoxious
forest of macros in fs_parser.h - with unchanged cpp output.

The following changes since commit 35ac1184244f1329783e1d897f74926d8bb1103a:

  cgroup: saner refcounting for cgroup_root (2019-01-17 11:53:02 -0500)

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git work.mount

for you to fetch changes up to c99c2171fc61476afac0dfb59fb2c447a01fb1e0:

  afs: Use fs_context to pass parameters over automount (2019-02-28 03:29:39 -0500)

----------------------------------------------------------------
Al Viro (19):
      kill kernfs_pin_sb()
      separate copying and locking mount tree on cross-userns copies
      saner handling of temporary namespaces
      new helpers: vfs_create_mount(), fc_mount()
      teach vfs_get_tree() to handle subtype, switch do_new_mount() to it
      vfs_get_tree(): evict the call of security_sb_kern_mount()
      fs_context flavour for submounts
      introduce fs_context methods
      convenience helpers: vfs_get_super() and sget_fc()
      introduce cloning of fs_context
      cgroup: start switching to fs_context
      cgroup: fold cgroup1_mount() into cgroup1_get_tree()
      cgroup: take options parsing into ->parse_monolithic()
      cgroup1: switch to option-by-option parsing
      cgroup2: switch to option-by-option parsing
      cgroup: stash cgroup_root reference into cgroup_fs_context
      cgroup_do_mount(): massage calling conventions
      cgroup1_get_tree(): separate "get cgroup_root to use" into a separate helper
      cgroup: store a reference to cgroup_ns into cgroup_fs_context

David Howells (22):
      vfs: Introduce fs_context, switch vfs_kern_mount() to it.
      new helper: do_new_mount_fc()
      convert do_remount_sb() to fs_context
      vfs: Introduce logging functions
      vfs: Add configuration parser helpers
      vfs: Add LSM hooks for the new mount API
      selinux: Implement the new mount API LSM hooks
      smack: Implement filesystem context security hooks
      vfs: Put security flags into the fs_context struct
      vfs: Implement a filesystem superblock creation/configuration context
      procfs: Move proc_fill_super() to fs/proc/root.c
      proc: Add fs_context support to procfs
      ipc: Convert mqueue fs to fs_context
      kernfs, sysfs, cgroup, intel_rdt: Support fs_context
      cpuset: Use fs_context
      hugetlbfs: Convert to fs_context
      vfs: Remove kern_mount_data()
      vfs: Provide documentation for new mount API
      vfs: Implement logging through fs_context
      vfs: Add some logging to the core users of the fs_context log
      afs: Add fs_context support
      afs: Use fs_context to pass parameters over automount

 Documentation/filesystems/mount_api.txt | 709 ++++++++++++++++++++++++++++++++
 arch/x86/kernel/cpu/resctrl/internal.h  |  16 +
 arch/x86/kernel/cpu/resctrl/rdtgroup.c  | 185 +++++----
 fs/Kconfig                              |   7 +
 fs/Makefile                             |   3 +-
 fs/afs/internal.h                       |   9 +-
 fs/afs/mntpt.c                          | 149 +++----
 fs/afs/super.c                          | 430 +++++++++----------
 fs/afs/volume.c                         |   4 +-
 fs/filesystems.c                        |   4 +
 fs/fs_context.c                         | 642 +++++++++++++++++++++++++++++
 fs/fs_parser.c                          | 447 ++++++++++++++++++++
 fs/hugetlbfs/inode.c                    | 358 +++++++++-------
 fs/internal.h                           |  13 +-
 fs/kernfs/kernfs-internal.h             |   1 +
 fs/kernfs/mount.c                       | 119 ++----
 fs/mount.h                              |   5 +
 fs/namei.c                              |   4 +-
 fs/namespace.c                          | 395 +++++++++++-------
 fs/pnode.c                              |   5 -
 fs/pnode.h                              |   3 +-
 fs/proc/inode.c                         |  52 +--
 fs/proc/internal.h                      |   5 +-
 fs/proc/root.c                          | 236 ++++++++---
 fs/super.c                              | 344 +++++++++++++---
 fs/sysfs/mount.c                        |  73 +++-
 include/linux/errno.h                   |   1 +
 include/linux/fs.h                      |  14 +-
 include/linux/fs_context.h              | 188 +++++++++
 include/linux/fs_parser.h               | 151 +++++++
 include/linux/kernfs.h                  |  39 +-
 include/linux/lsm_hooks.h               |  21 +
 include/linux/mount.h                   |   3 +
 include/linux/security.h                |  18 +-
 ipc/mqueue.c                            |  94 ++++-
 ipc/namespace.c                         |   2 +-
 kernel/cgroup/cgroup-internal.h         |  49 ++-
 kernel/cgroup/cgroup-v1.c               | 394 +++++++++---------
 kernel/cgroup/cgroup.c                  | 223 ++++++----
 kernel/cgroup/cpuset.c                  |  56 ++-
 security/security.c                     |  10 +
 security/selinux/hooks.c                |  88 +++-
 security/selinux/include/security.h     |  10 +-
 security/smack/smack.h                  |  19 +-
 security/smack/smack_lsm.c              |  92 ++++-
 45 files changed, 4358 insertions(+), 1332 deletions(-)
 create mode 100644 Documentation/filesystems/mount_api.txt
 create mode 100644 fs/fs_context.c
 create mode 100644 fs/fs_parser.c
 create mode 100644 include/linux/fs_context.h
 create mode 100644 include/linux/fs_parser.h