Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

It allows to freeze processes faster
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Without using a freezer cgroup, we need to do a few iterations to catch
all tasks, because a new tasks can be born. If new tasks appear faster
than criu collects them, criu fails. The freezer cgroup allows to
solve this problem.

We freeze the freezer group, then attaches to tasks with ptrace and thaw
the freezer cgroup. We suppose that all tasks which are going to be
dumped in a specified freezer group.

v2: fix comments from Christopher
Reviewed-by: Christopher Covington <cov@codeaurora.org>

v3: refactor task_seize

v4: fix comments from Pavel

Cc: Christopher Covington <cov@codeaurora.org>
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Before cr_errno was called from open_pid_proc(), but
now it isn't called if a root task doesn't exist.

Reported-by: Mr Jenkins
Fixes: b9b0730c ("ptrace: split task_seize into seize_catch_task and seize_wait_task")
Signed-off-by: Andrew Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

gcc -c test.c -I ./
test.c: In function ‘recv_resp’:
test.c:18:8: warning: implicit declaration of function ‘read’ [-Wimplicit-function-declaration]
  len = read(socket_fd, buf, MAX_MSG_SIZE);
        ^
test.c: In function ‘send_req’:
test.c:45:6: warning: implicit declaration of function ‘write’ [-Wimplicit-function-declaration]
  if (write(socket_fd, buf, len)  == -1) {
      ^
test.c: In function ‘main’:
test.c:165:2: warning: implicit declaration of function ‘close’ [-Wimplicit-function-declaration]
  close(fd);

Reported-by: Mr Jenkins
Signed-off-by: Andrew Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

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

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

It's required to dump uid-s and gid-s from this userns.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

It's required for dumping tmpfs, where we use tar to save content.
If we need to execute tar from a proper userns to get right uid-s and
gid-s for files.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

uid and gid are shown in the init userns. We are going to restore mounts
in a target userns, so we need to set these options in the target
userns.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

This test checks that the OverlayFS fixup for CRIU works correctly
by dumping and restoring a process that has an open file in an
OverlayFS mounted directory. This should work no matter if the
Kernel has the OverlayFS bug or not.
Signed-off-by: Gabriel Guimaraes <gabriellimaguimaraes@gmail.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

This is here only to support the Linux Kernel between versions
3.18 and 4.2. After that, this workaround is not needed anymore,
but it will work properly on both a kernel with and without the bug.

The bug is that when a process has a file open in an OverlayFS directory,
the information in /proc/<pid>/fd/<fd> and /proc/<pid>/fdinfo/<fd>
is wrong, so we grab that information from the mountinfo table instead.

This is done every time fill_fdlink is called.
We first check to see if the mnt_id and st_dev numbers currently match
some entry in the mountinfo table. If so, we already have the correct mnt_id
and no fixup is needed.

Then we proceed to see if there are any overlayFS mounted directories
in the mountinfo table. If so, we concatenate the mountpoint with the
name of the file, and stat the resulting path to check if we found the
correct device id and node number. If that is the case, we update the
mount id and link variables with the correct values.
Signed-off-by: Gabriel Guimaraes <gabriellimaguimaraes@gmail.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

It's preparation to use a freezer cgroup for freezing tasks.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Ruslan Kuprieiev <rkuprieiev@cloudlinux.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

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

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Hui Kang <hkang.sunysb@gmail.com>
Looks-good-to: Ruslan Kuprieiev <kupruser@gmail.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Currently we skip all userns tests if "criu check" fails. This code was
written when the "freature" options of criu check didn't exist.

Currently we add userns tests only if "criu check --feature userns" passes.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Dynamically allocated @name doesn't release
if error happened.

 | ** CID 129898:    (RESOURCE_LEAK)
 | /sk-unix.c: 505 in unix_process_name()
 | /sk-unix.c: 509 in unix_process_name()
 | /sk-unix.c: 519 in unix_process_name()
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

They should do mostly the same, but the first one checks nothing after
c/r.

v2: remove sockets03 from Makefile
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

because we are going to restore data of peer.

Anyway this is wrong, because we need to restore a message with a sender
address.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Acked-by: Tycho Andersen <tycho.andersen@canonical.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

This test fails currently, because these data are not restored.

v2: remove the test from the execution list.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

If we want one CRIU binary to work across all AArch64 kernel
configurations, a single task size value cannot be hard coded. While
trivial applications successfully checkpoint and restore on AArch64
kernels with CONFIG_ARM64_64K_PAGES=y without this patch, replacing
the remaining use of the hard-coded value seems like the best way to
guard against failures that more complex process trees and future uses
may expose.
Signed-off-by: Christopher Covington <cov@codeaurora.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

If we want one CRIU binary to work across all AArch64 kernel
configurations, a single task size value cannot be hard coded. Since
vma_area_is_private() is used by both restorer blob code and non
restorer blob code, which must use different variables for recording
the task size, make task_size a function argument and modify the call
sites accordingly. This fixes the following error on AArch64 kernels
with CONFIG_ARM64_64K_PAGES=y.

  pie: Error (pie/restorer.c:929): Can't restore 0x3ffb7e70000 mapping w>
  pie: ith 0xfffffffffffffff7
Signed-off-by: Christopher Covington <cov@codeaurora.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

If we want one CRIU binary to work across all AArch64 kernel
configurations, a single task size value cannot be hard coded.
This fixes the following error on AArch64 kernels with
CONFIG_ARM64_64K_PAGES=y.

  pie: Error (pie/restorer.c:772): Unable to unmap (-): -1211695104
Signed-off-by: Christopher Covington <cov@codeaurora.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

If we want one CRIU binary to work across all AArch64 kernel
configurations, a single task size value cannot be hard coded.
Signed-off-by: Christopher Covington <cov@codeaurora.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Currently each task subtracts number of zombies from
task_entries->nr_threads without locks, so if two tasks will do this
operation concurrently, the result may be unpredictable.

https://github.com/xemul/criu/issues/13

Cc: Tycho Andersen <tycho.andersen@canonical.com>
Signed-off-by: Andrew Vagin <avagin@openvz.org>
Acked-by: Tycho Andersen <tycho.andersen@canonical.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Ruslan Kuprieiev <rkuprieiev@cloudlinux.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Ruslan Kuprieiev <rkuprieiev@cloudlinux.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Users shouldn't use it directly anyway, they should
use criu_set* fucntions for that.
Signed-off-by: Ruslan Kuprieiev <rkuprieiev@cloudlinux.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

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

In case if socket's cwd lays on nested mount point
we might resolve its path a bit incorrectly
(mount_resolve_path helper should not obtain
 paths with leading dot).

Thus send a path without leading dot for correct
name resolving.

Also add some error messages.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

In this mode libcriu will execute criu binary in swrk
mode, so users are not always obliged to run criu service
daemon.
Signed-off-by: Ruslan Kuprieiev <rkuprieiev@cloudlinux.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Ruslan Kuprieiev <rkuprieiev@cloudlinux.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Ruslan Kuprieiev <rkuprieiev@cloudlinux.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Use CRTOOLSVERSION instead of GITID to write criu.pc version. With
GITID, criu.pc had version '0' when built from tarballs.
Signed-off-by: Cédric Bosdonnat <cbosdonnat@suse.com>
Acked-by: Tycho Andersen <tycho.andersen@canonical.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>