[CRIU] [PATCH 2/4] protobuf: Start switching our image entries to Google's protobuf

[Cyrill Gorcunov]

A short story -- there were a long conversation on which format should
be used to keep checkpointed data on disk image. We ended up in using
Google's Protocol Buffers (see https://developers.google.com/protocol-buffers/
for detailed description). Thus image entries should be convered to PB.

But before anything else we need a scaffold, ie .proto files which declare
entries on disk.

Instead of squashing everything in one commit we introduce only a few
types needed for further work. In particular

 - message fdinfo_entry

        This message maps old fdinfo_entry structure

 - message fown_t

        This message maps old fown_t, which is embedded
        in a number of another messages

 - message reg_file_entry

        This message maps old reg_file_entry structure

Note that there is no real use of this facility in our code yet.

Build note: one should have protobuf and protobuf-c installed to be able
to build crtools.

 - http://code.google.com/p/protobuf/
 - http://code.google.com/p/protobuf-c/

Inspired-by: Kinsbursky Stanislav <skinsbursky at openvz.org>
Inspired-by: Pavel Emelianov <xemul at parallels.com>
Signed-off-by: Cyrill Gorcunov <gorcunov at openvz.org>
---
 Makefile               |   14 +++++++++---
 protobuf/Makefile      |   53 ++++++++++++++++++++++++++++++++++++++++++++++++
 protobuf/fdinfo.proto  |    6 +++++
 protobuf/fown.proto    |    7 ++++++
 protobuf/regfile.proto |   10 +++++++++
 5 files changed, 86 insertions(+), 4 deletions(-)
 create mode 100644 protobuf/Makefile
 create mode 100644 protobuf/fdinfo.proto
 create mode 100644 protobuf/fown.proto
 create mode 100644 protobuf/regfile.proto

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