The current scheme still involves a lot of open-coding and copy-pasing
and bleeds a lot of unnecessary details into actual namespace
implementers. Encapsulate it in the common helpers and simplify it all.

Signed-off-by: Christian Brauner <brauner@kernel.org>
---
Christian Brauner (9):
      uts: split namespace into separate header
      mnt: expose pointer to init_mnt_ns
      nscommon: move to separate file
      cgroup: split namespace into separate header
      nsfs: add inode number for anon namespace
      mnt: simplify ns_common_init() handling
      net: centralize ns_common initialization
      nscommon: simplify initialization
      ns: add ns_common_free()

 fs/namespace.c                   | 16 ++++++----
 include/linux/cgroup.h           | 51 +------------------------------
 include/linux/cgroup_namespace.h | 56 ++++++++++++++++++++++++++++++++++
 include/linux/mnt_namespace.h    |  2 ++
 include/linux/ns_common.h        | 43 ++++++++++++++++++++++++++
 include/linux/proc_ns.h          | 21 -------------
 include/linux/uts_namespace.h    | 65 ++++++++++++++++++++++++++++++++++++++++
 include/linux/utsname.h          | 58 +----------------------------------
 include/uapi/linux/nsfs.h        |  3 ++
 ipc/namespace.c                  |  6 ++--
 kernel/Makefile                  |  2 +-
 kernel/cgroup/namespace.c        |  4 +--
 kernel/nscommon.c                | 25 ++++++++++++++++
 kernel/pid_namespace.c           |  6 ++--
 kernel/time/namespace.c          |  4 +--
 kernel/user_namespace.c          |  6 ++--
 kernel/utsname.c                 |  4 +--
 net/core/net_namespace.c         | 23 ++------------
 18 files changed, 225 insertions(+), 170 deletions(-)
---
base-commit: bf56a464f4ad7143c6e4b581b411f682f345a344
change-id: 20250917-work-namespace-ns_common-5859468e4c55