[CRIU] [PATCH 15/32] tools: cpt2 -- Read files, fds, inodes, fs related info

[Cyrill Gorcunov]

In this patch we put the ground for reading files,
opened file descriptors, inodes and fs related info
(current working directory and root).

The relation between structures is the following

 - fs_struct keeps info about root and cwd directory
   which is associated with a task

 - files_struct keeps a list of opened file descriptors
   which is associated with a task as well

 - fd_struct represents opened file descriptor itself
   and it's associated with files_struct

 - file_struct represents data associated with a file,
   among other things we have @dumped entry here thus
   once file is converted and written to criu image
   file the @dumped set to true and we never write it
   again (in criu this work is indirectly done for us
   by kcmp call -- we never generate "new" files if one
   has been seen already)

There is no "write to criu image" action yet, just reading
for simplicity.

Signed-off-by: Cyrill Gorcunov <gorcunov at openvz.org>
---
 tools/cpt2/src/Makefile        |   1 +
 tools/cpt2/src/files.c         | 314 +++++++++++++++++++++++++++++++++++++++++
 tools/cpt2/src/include/files.h |  50 +++++++
 3 files changed, 365 insertions(+)
 create mode 100644 tools/cpt2/src/files.c
 create mode 100644 tools/cpt2/src/include/files.h

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