Stop open accesses to the reference counts and cargo-culting the same
code in all namespace. Use a set of dedicated helpers and make the
actual count private.

Signed-off-by: Christian Brauner <brauner@kernel.org>
---
Christian Brauner (14):
      ns: add reference count helpers
      mnt: port to ns_ref_*() helpers
      cgroup: port to ns_ref_*() helpers
      ipc: port to ns_ref_*() helpers
      pid: port to ns_ref_*() helpers
      time: port to ns_ref_*() helpers
      user: port to ns_ref_*() helpers
      net-sysfs: use check_net()
      net: use check_net()
      ipv4: use check_net()
      uts: port to ns_ref_*() helpers
      net: port to ns_ref_*() helpers
      nsfs: port to ns_ref_*() helpers
      ns: rename to __ns_ref

 fs/mount.h                       |  2 +-
 fs/namespace.c                   |  4 ++--
 fs/nsfs.c                        |  2 +-
 include/linux/cgroup_namespace.h |  4 ++--
 include/linux/ipc_namespace.h    |  4 ++--
 include/linux/ns_common.h        | 47 ++++++++++++++++++++++++++++++----------
 include/linux/pid_namespace.h    |  2 +-
 include/linux/time_namespace.h   |  4 ++--
 include/linux/user_namespace.h   |  4 ++--
 include/linux/uts_namespace.h    |  4 ++--
 include/net/net_namespace.h      |  8 +++----
 init/version-timestamp.c         |  2 +-
 ipc/msgutil.c                    |  2 +-
 ipc/namespace.c                  |  2 +-
 kernel/cgroup/cgroup.c           |  2 +-
 kernel/nscommon.c                |  2 +-
 kernel/pid.c                     |  2 +-
 kernel/pid_namespace.c           |  4 ++--
 kernel/time/namespace.c          |  2 +-
 kernel/user.c                    |  2 +-
 kernel/user_namespace.c          |  2 +-
 net/core/net-sysfs.c             |  6 ++---
 net/core/net_namespace.c         |  2 +-
 net/ipv4/inet_timewait_sock.c    |  4 ++--
 net/ipv4/tcp_metrics.c           |  2 +-
 25 files changed, 73 insertions(+), 48 deletions(-)
---
base-commit: 3f9cc273c16f63b5d584ec4e767918765c44316b
change-id: 20250917-work-namespace-ns_ref-357162ca7aa8