[CRIU] [PATCH 00/14] 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 patches from
"[PATCH 0/3] Synchronize forking on mutex" patchset to escape
of ns_last_pid file lock.

Patch [1/14] was already sent as separate fix, and it's
repeated here because I created the series over it, and
don't want travis errors.

The result of patchset is decreasing of do_create_pid_ns_helper()
code and improving its readability. See the final result
in patch [13/14].

https://travis-ci.org/tkhai/criu/builds/232407624

---

Kirill Tkhai (14):
      pid_ns: Destroy helpers via kill()
      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       |   78 ++++++++++------------
 criu/include/rst_info.h |   13 ++++
 criu/namespaces.c       |  168 ++++++++++++++++++-----------------------------
 criu/pie/restorer.c     |   34 ++++------
 4 files changed, 128 insertions(+), 165 deletions(-)

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