test/tcp/run.sh: fix permission

Signed-off-by: Yicheng Qin <yichengq@google.com>
Acked-by: Andrew Vagin <avagin@parallels.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
test: create env.sh for environment setting

Currently, env.sh only contains the location of criu executable.

Signed-off-by: Yicheng Qin <yichengq@google.com>
Acked-by: Andrew Vagin <avagin@parallels.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
zdtm: clean up test_fork

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
zdtm: add a new test, where both sides of a tcp connection is dumped

Reported-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
restore: do not kill processes if not-all of them have been created

If processes are restored without pidns, criu knows pidtheir -s from images,
but part of those task may have not yet forked, and thus the pids can not
exist or (!) be used by other processes.

To address that we abort stages RESTORE_NS and FORKING without killing tasks,
but with task_entries->start futex by writing STATE_FAIL into it and making
the tasks to check that. Since during RESTORE_NS and FORKING stages tasks can
only block on the mentioned futes, we can safely do it.

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
pb: Free image object of collection doesn't need it

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
rst: Rework remaps collection on generic collect routine

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
rst: Compact file-descs collects a bit

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
collect: Reduce amount of args to collect_image call

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
collect: Shorten common images collecting code

Now we have a set of cinfo-s, it's possible to collect all
this stuff in a plan for-loop.

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
test/zdtm: add option -r to run test with specified name

The option can run test with specified name directly without check
or match.

It can be used to run experimental test that is not in TEST_LIST.

Signed-off-by: Yicheng Qin <yichengq@google.com>
Acked-by: Andrew Vagin <avagin@parallels.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
net: Prepare to dump netdev entry with extentions

Some (most) network devices would like to have NetDeviceEntry with
more fields, than currently present (and enough for lo and veth).
Prepare for that by allowing them to define their own callback that
would fill the resor of the pb entry and call write_netdev_img().

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
net: Mount ns' sysfs before dump

Some information about network devices may hide in sysfs, thus
it's required to have one at hands while dumping the netns.

Create the detached mount for that.

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
net: Read ns' sysfs file helper

Just a small helper, that reads string from ns' sysfs mount.

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
files: Don't restore pos when file doesn't support one

It's not quite clean, but on dump non-seekable files dump 0xff...ff into
64-bit pos field of the image. Thus on restore we'd face an error in the
do_open_reg. In order not to have separate helper for non-seekable files
just skip the position restore for such.

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
net: Ability to restore existing link's params with rtm

TUN devices are created with ioctl, but their parameters (e.g.
flags with state, mtu, etc.) are to be restored with generic
RTM_SETLINK message.

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
tun: Initial skeleton for tun support

There will be two entities handled:

1. tun file -- an opened char device with misc major and tun minor
   that can be attached to item #2

2. tun netdevice -- another type of links

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
tun: Dump tun files and tun links

The major issue with dump is -- some info id get via netlink,
some via sysfs and some (!) via opened and attached tun file.
But the latter cannot be created, if there's another one attached
(or the mq device is full with threads).

Thus we have to dump this info via existing tun file and keep one
in memory till the link dump code takes place.

Opposite situation is also possible -- we can have a persistent
unattached device. In this case we have to attach to it, dump
things and detach back.

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
tun: Restore tun files and tun links

This thing is pretty straightforward -- on netns creation
populate it with tun-s, after this collect tun files, open
and attach them with regular fd-s engine.

One tricky thing -- when populating namespace with tun links
make them all persistent and drop this flag (if required)
later, when the first alive opened appears.

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
zdtm: Basic checks for tun files/links are c/r-ed properly

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>