[CRIU] [RFC 00/18] sk-unix: Add ability to work with deleted sockets

[Cyrill Gorcunov]

Hi! Here is a first rfc to restore unix dgram sockets with deleted addresses.
Notes

 - first patches for add_post_prepare_cb_once I've been sending
   already, but they are floating around yet so I fear without
   them the series wont apply, so I resend

 - I'll modify this series to cleanup filesystem if subdirectories
   were deleted as well

Anyway, please take a look maybe some better idea come to mind
how to handle deteled sockets with less code. The most important
patches are

 - sk-unix: Collect deleted identical addresses in the queues
 - sk-unix: Add ability to restore sockets with deleted vfs addresses

The rest are more-less independent.

Cyrill Gorcunov (18):
  restore: Add add_post_prepare_cb_once helper
  tty: Use add_post_prepare_cb_once
  pipes: Use add_post_prepare_cb_once
  sk-unix: Make can_dump_unix_sk being boolean
  sk-unix: Adjust unix_sk_cinfo members
  sk-unix: Adjust unix_sk_info members
  sk-unix: Use native types in unix_sk_info
  sk-unix: Use generic xptr_pull in dump_one_unix_fd
  sk-unix: Drop empty line
  util: Add rmdirp helper
  sk-unix: Use add_post_prepare_cb_once helper
  sk-unix: Drop empty line at eof
  sk-unix: Make USK_ flags in shift form
  sk-unix: Collect deleted identical addresses in the queues
  sk-unix: Don't warn if nothing to unlink
  sk-unix: Print cwd been restored if @name_dir is present
  sk-unix: Add ability to restore sockets with deleted vfs addresses
  test: Add sk-unix01 test

 criu/include/crtools.h          |  13 ++
 criu/include/util.h             |   2 +
 criu/pipes.c                    |   5 +-
 criu/sk-unix.c                  | 397 ++++++++++++++++++++++++++++++++--------
 criu/tty.c                      |   9 +-
 criu/util.c                     |  40 ++++
 test/zdtm/static/Makefile       |   1 +
 test/zdtm/static/sk-unix01.c    | 249 +++++++++++++++++++++++++
 test/zdtm/static/sk-unix01.desc |   1 +
 9 files changed, 636 insertions(+), 81 deletions(-)
 create mode 100644 test/zdtm/static/sk-unix01.c
 create mode 100644 test/zdtm/static/sk-unix01.desc

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