[CRIU] [PATCH 0/9] mount: add support of non-root shared mounts

[Andrey Vagin]

Cyrill found that CRIU are not able to containers with fedora,
where a service is executed in a separate mount namespace.
Here is a mountinfo for one of such services:
65 64 252:0 /vz/private/1 / rw,relatime shared:29 - ext4 /dev/mapper/centos_pcs-root rw,data=ordered
77 65 252:0 /vz/private/1/var/tmp/systemd-httpd.service-XLnJPNc/tmp /var/tmp rw,relatime shared:41 - ext4 /dev/mapper/centos_pcs-root rw,data=ordered

Here is a non-root shared bind-mount and its parent is from the
same shared group. This series adds support for such mounts.

Andrey Vagin (9):
  zdtm: add a test to check non-root shared bind-mounts
  Revert "mount: don't create a temporary directory for pivot_root()"
  mount: don't mark mounts as private twice
  mntns: pivot_root() can move the current root to a non-shared mount
  mount: don't add extra / between a temporary root and mountpoint
  mount: move code to validate shared mounts in a separate function
  mntns: rework validation to support non-root shared bind-mounts
  mount: add the mnt_roots mount in the mount tree on restore
  mount: rework can_mount_now() to support bind-mounts of shared mounts

 mount.c                                 | 247 ++++++++++++++++++++++----------
 test/zdtm.sh                            |   3 +
 test/zdtm/live/static/Makefile          |   1 +
 test/zdtm/live/static/mntns_root_bind.c | 106 ++++++++++++++
 4 files changed, 283 insertions(+), 74 deletions(-)
 create mode 100644 test/zdtm/live/static/mntns_root_bind.c

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1.9.3