[CRIU] [PATCH cr 00/12] Use the common scheme for restoring pipes

[Andrey Vagin]

What is a pipe? It's a set of file structs, which connect to
pipe's tails.

Information about pipes are saved in one files.
pipe_entry describes a pipe's file struct.
A pipe has not own properties, so it has not own object.
All pipe_entry of the same pipes connet in pipe_list. When all
pipe_entry-s and fdinfo-s collected, we enumirate them one
more time to choose who will create pipes.
A pipe is restored by the process with minimal pid for
the descriptor with minimal number. Other recipients
get it via unix sockets even if they are in the same process.
It may be optimized in the future.

All pipe data are aligned in imege file due to splice.

A few zdtm test cases are added.

Andrey Vagin (12):
  pipe: write some data in pipe and read it after suspend/resume
  pipe: remove old code for restoring pipes
  pipe: all pipes are seved in one file
  files: split open_transport_fd
  pipe: add a separate file for pipe's stuff
  files: add some function in files.h
  pipes: add functions for collecting pipes
  pipe: choose who will restore a pipe
  pipes: add functions to restore pipes
  pipes: restore pipes data
  zdtm: add a new test case to check that all data can be restored
  pipes: align pipe data on page size in an image file

 Makefile                       |    1 +
 cr-dump.c                      |  208 ++++++++++---------
 cr-restore.c                   |  448 +---------------------------------------
 cr-show.c                      |   12 +-
 files.c                        |   63 ++++---
 include/crtools.h              |    4 +-
 include/files.h                |   19 ++
 include/image.h                |    5 +-
 pipes.c                        |  375 +++++++++++++++++++++++++++++++++
 test/zdtm.sh                   |    1 +
 test/zdtm/live/static/Makefile |    1 +
 test/zdtm/live/static/pipe00.c |   10 +
 test/zdtm/live/static/pipe01.c |  132 ++++++++++++
 13 files changed, 704 insertions(+), 575 deletions(-)
 create mode 100644 pipes.c
 create mode 100644 test/zdtm/live/static/pipe01.c