[git pull] vfs.git pile 2

[Al Viro]

Next pile (and there'll be one or two more).  The large piece in this one is
getting rid of /proc/*/ns/* weirdness; among other things, it allows to
(finally) make nameidata completely opaque outside of fs/namei.c, making for
easier further cleanups in there.

I have _not_ included removal of unshare_fs_struct() into that pile; I think
it'll turn out to be OK, but it's clearly the next cycle fodder.

Please, pull from the usual place -
git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git for-linus

Shortlog:
Al Viro (20):
      common object embedded into various struct ....ns
      make mntns ->get()/->put()/->install()/->inum() work with &mnt_ns->ns
      netns: switch ->get()/->put()/->install()/->inum() to working with &net->ns
      switch the rest of proc_ns_operations to working with &...->ns
      make proc_ns_operations work with struct ns_common * instead of void *
      new helpers: ns_alloc_inum/ns_free_inum
      copy address of proc_ns_ops into ns_common
      bury struct proc_ns in fs/proc
      take the targets of /proc/*/ns/* symlinks to separate fs
      kill proc_ns completely
      make nameidata completely opaque outside of fs/namei.c
      make default ->i_fop have ->open() fail with ENXIO
      path_init(): store the "base" pointer to file in nameidata itself
      fs/namei.c: new helper (path_cleanup())
      path_init(): don't bother with LOOKUP_PARENT in argument
      fs/namei.c: fold link_path_walk() call into path_init()
      coda_venus_readdir(): use file_inode()
      spawn PID 1 without CLONE_FS, give kernel threads zero umask
      lustre: get rid of playing with ->fs
      btrfs: filp_open() returns ERR_PTR() on failure, not NULL...

Diffstat:
 arch/ia64/kernel/perfmon.c                         |  10 --
 .../lustre/lustre/include/linux/lustre_compat25.h  |  24 ---
 drivers/staging/lustre/lustre/llite/dir.c          |   2 +-
 drivers/staging/lustre/lustre/llite/llite_lib.c    |  17 +--
 fs/Makefile                                        |   2 +-
 fs/btrfs/volumes.c                                 |   2 +-
 fs/coda/dir.c                                      |   4 +-
 fs/fs_struct.c                                     |   2 +-
 fs/inode.c                                         |  11 +-
 fs/internal.h                                      |   5 +
 fs/mount.h                                         |   3 +-
 fs/namei.c                                         |  98 +++++++------
 fs/namespace.c                                     |  51 +++----
 fs/nsfs.c                                          | 161 +++++++++++++++++++++
 fs/proc/inode.c                                    |  10 +-
 fs/proc/internal.h                                 |   2 +-
 fs/proc/namespaces.c                               | 153 ++------------------
 include/linux/fs.h                                 |   1 -
 include/linux/ipc_namespace.h                      |   3 +-
 include/linux/namei.h                              |  25 +---
 include/linux/ns_common.h                          |  12 ++
 include/linux/pid_namespace.h                      |   3 +-
 include/linux/proc_ns.h                            |  43 +++---
 include/linux/user_namespace.h                     |   3 +-
 include/linux/utsname.h                            |   3 +-
 include/net/net_namespace.h                        |   3 +-
 include/uapi/linux/magic.h                         |   1 +
 init/main.c                                        |   6 +-
 init/version.c                                     |   5 +-
 ipc/msgutil.c                                      |   5 +-
 ipc/namespace.c                                    |  32 ++--
 kernel/kmod.c                                      |   2 +
 kernel/nsproxy.c                                   |  10 +-
 kernel/pid.c                                       |   5 +-
 kernel/pid_namespace.c                             |  29 ++--
 kernel/user.c                                      |   5 +-
 kernel/user_namespace.c                            |  29 ++--
 kernel/utsname.c                                   |  31 ++--
 net/Makefile                                       |   2 -
 net/core/net_namespace.c                           |  39 ++---
 net/nonet.c                                        |  26 ----
 net/socket.c                                       |  19 ---
 42 files changed, 425 insertions(+), 474 deletions(-)
 create mode 100644 fs/nsfs.c
 create mode 100644 include/linux/ns_common.h
 delete mode 100644 net/nonet.c
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