[CRIU] [PATCH v2 00/13] Refactor pid_ns helpers creation

[Kirill Tkhai]

This series mostly simplifies do_create_pid_ns_helper(), which
is currently too large and complex. It uses modified patches from
"[PATCH 0/3] Synchronize forking on mutex" patchset to escape
of ns_last_pid file lock.

The result of patchset is decreasing of do_create_pid_ns_helper()
code and improving its readability. See the final result
in patch [12/13].

v2: Kill flock() of ns_last_pid at all

---

Kirill Tkhai (13):
      restore: Simplify do_fork_with_pid()
      restore: Simplify do_fork_with_pid() #2
      restore: Delete excess code in call_clone_fn()
      restore: Always set real pid in restore_task_with_children()
      pid_ns: Rename do_destroy_pid_ns_helper()
      pid_ns: Pass namespace init task to do_create_pid_ns_helper()
      pid_ns: Simplify do_create_pid_ns_helper() using ns helpers
      pid_ns: Move parent pid_ns's helper check to create_pid_ns_helper()
      namespace: Group unlocking/closing operations in do_create_pid_ns_helper()
      forking: Introduce last_pid_mutex and helpers
      forking: Use last_pid_mutex for synchronization during clone()
      pid_ns: Do cleanups in do_create_pid_ns_helper()
      pid_ns: Close sk in case of pid_ns_helper_sock() fails


 criu/cr-restore.c       |   56 ++++++++--------------------
 criu/img-remote-proto.c |   16 --------
 criu/include/rst_info.h |   13 +++++++
 criu/namespaces.c       |   94 ++++++++++++++---------------------------------
 criu/pie/restorer.c     |   34 +++++++----------
 5 files changed, 70 insertions(+), 143 deletions(-)

--
Signed-off-by: Kirill Tkhai <ktkhai at virtuozzo.com>