[GIT PULL] Namespace file descriptors for 2.6.40

[ebiederm@xmission.com (Eric W. Biederman)]

Please pull the namespace file descriptor git tree from:

   git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/linux-2.6-nsfd.git

Because other syscall work has happened in other trees there
are conflicts on alpha and m68k.

For alpha all that is needed is a simple incrementing of the syscall
number in my tree and adding of my syscall to the end of the list.

For m68k please just delete all of the syscall entries the conflict will
add to arch/m68k/kernel/entry_mm.S.  The m68k tree has consolidated
everything in arch/m68k/kernel/syscalltable.S


This tree adds the files /proc/<pid>/ns/net, /proc/<pid>/ns/ipc,
/proc/<pid>/ns/uts that can be opened to refer to the namespaces of a
process at the time those files are opened, and can be bind mounted to
keep the specified namespace alive without a process.

This tree adds the setns system call that can be used to change the
specified namespace of a process to the namespace specified by a system
call.

This tree adds a new rtnetlink attribute that allows for moving a
network device into a network namespace specified by a file descriptor.

Support for the other namespaces is planned but is not ready for 2.6.40.

These changes dramatically simplify what a userspace process has to do
to keep a namespace alive, and to execute system calls in it.

The shortlog:

Stephen Rothwell (1):
      net: fix get_net_ns_by_fd for !CONFIG_NET_NS

Eric W. Biederman (11):
      ns: proc files for namespace naming policy.
      ns: Introduce the setns syscall
      ns proc: Add support for the network namespace.
      ns proc: Add support for the uts namespace
      ns proc: Add support for the ipc namespace
      net: Allow setting the network namespace by fd
      Merge commit '2e7bad5f34b5beed47542490c760ed26574e38ba' into HEAD
      Merge commit '7143b7d41218d4fc2ea33e6056c73609527ae687' into HEAD
      ns: Wire up the setns system call
      ns: Declare sys_setns in syscalls.h
      ns proc: Return -ENOENT for a nonexistent /proc/self/ns/ entry.

The diffstat:

 arch/alpha/include/asm/unistd.h        |    3 +-
 arch/alpha/kernel/systbls.S            |    1 +
 arch/arm/include/asm/unistd.h          |    1 +
 arch/arm/kernel/calls.S                |    1 +
 arch/avr32/include/asm/unistd.h        |    3 +-
 arch/avr32/kernel/syscall_table.S      |    1 +
 arch/blackfin/include/asm/unistd.h     |    3 +-
 arch/blackfin/mach-common/entry.S      |    1 +
 arch/cris/arch-v10/kernel/entry.S      |    1 +
 arch/cris/arch-v32/kernel/entry.S      |    1 +
 arch/cris/include/asm/unistd.h         |    3 +-
 arch/frv/include/asm/unistd.h          |    3 +-
 arch/frv/kernel/entry.S                |    1 +
 arch/h8300/include/asm/unistd.h        |    3 +-
 arch/h8300/kernel/syscalls.S           |    1 +
 arch/ia64/include/asm/unistd.h         |    3 +-
 arch/ia64/kernel/entry.S               |    1 +
 arch/m32r/include/asm/unistd.h         |    3 +-
 arch/m32r/kernel/syscall_table.S       |    1 +
 arch/m68k/include/asm/unistd.h         |    3 +-
 arch/m68k/kernel/syscalltable.S        |    1 +
 arch/microblaze/include/asm/unistd.h   |    3 +-
 arch/microblaze/kernel/syscall_table.S |    1 +
 arch/mips/include/asm/unistd.h         |   15 ++-
 arch/mips/kernel/scall32-o32.S         |    1 +
 arch/mips/kernel/scall64-64.S          |    1 +
 arch/mips/kernel/scall64-n32.S         |    1 +
 arch/mips/kernel/scall64-o32.S         |    1 +
 arch/mn10300/include/asm/unistd.h      |    3 +-
 arch/mn10300/kernel/entry.S            |    1 +
 arch/parisc/include/asm/unistd.h       |    4 +-
 arch/parisc/kernel/syscall_table.S     |    1 +
 arch/powerpc/include/asm/systbl.h      |    1 +
 arch/powerpc/include/asm/unistd.h      |    3 +-
 arch/s390/include/asm/unistd.h         |    3 +-
 arch/s390/kernel/syscalls.S            |    1 +
 arch/sh/include/asm/unistd_32.h        |    3 +-
 arch/sh/include/asm/unistd_64.h        |    3 +-
 arch/sh/kernel/syscalls_32.S           |    1 +
 arch/sh/kernel/syscalls_64.S           |    1 +
 arch/sparc/include/asm/unistd.h        |    3 +-
 arch/sparc/kernel/systbls_32.S         |    2 +-
 arch/sparc/kernel/systbls_64.S         |    4 +-
 arch/x86/ia32/ia32entry.S              |    1 +
 arch/x86/include/asm/unistd_32.h       |    3 +-
 arch/x86/include/asm/unistd_64.h       |    2 +
 arch/x86/kernel/syscall_table_32.S     |    1 +
 arch/xtensa/include/asm/unistd.h       |    4 +-
 fs/proc/Makefile                       |    1 +
 fs/proc/base.c                         |   20 ++--
 fs/proc/inode.c                        |    7 +
 fs/proc/internal.h                     |   18 +++
 fs/proc/namespaces.c                   |  198 ++++++++++++++++++++++++++++++++
 include/asm-generic/unistd.h           |    4 +-
 include/linux/if_link.h                |    1 +
 include/linux/proc_fs.h                |   21 ++++
 include/linux/syscalls.h               |    1 +
 include/net/net_namespace.h            |    1 +
 ipc/namespace.c                        |   37 ++++++
 kernel/nsproxy.c                       |   42 +++++++
 kernel/utsname.c                       |   39 ++++++
 net/core/net_namespace.c               |   65 +++++++++++
 net/core/rtnetlink.c                   |    5 +-
 63 files changed, 525 insertions(+), 42 deletions(-)

Thanks,
Eric