This patchset aimed to make C/R of overlayfs mounts with CRIU possible. We introduce two new overlayfs module options -- dyn_path_opts and mnt_id_path_opts. If enabled this options allows to see real *full* paths in lowerdir, workdir, upperdir options, and also mnt_ids for corresponding paths. This changes should not break anything because for showing mnt_ids we simply introduce new show-time mount options. And for paths we simply *always* provide *full paths* instead of relative path on mountinfo. BEFORE overlay on /var/lib/docker/overlay2/XYZ/merged type overlay (rw,relatime, lowerdir=/var/lib/docker/overlay2/XYZ-init/diff:/var/lib/docker/overlay2/ ABC/diff,upperdir=/var/lib/docker/overlay2/XYZ/diff,workdir=/var/lib/docker /overlay2/XYZ/work) none on /sys type sysfs (rw,relatime) AFTER overlay on /var/lib/docker/overlay2/XYZ/merged type overlay (rw,relatime, lowerdir=/var/lib/docker/overlay2/XYZ-init/diff:/var/lib/docker/overlay2/ ABC/diff,upperdir=/var/lib/docker/overlay2/XYZ/diff,workdir=/var/lib/docker /overlay2/XYZ/work,lowerdir_mnt_id=175:175,upperdir_mnt_id=175) none on /sys type sysfs (rw,relatime) Alexander Mikhalitsyn (2): overlayfs: add dynamic path resolving in mount options overlayfs: add mnt_id paths options fs/overlayfs/Kconfig | 57 ++++++++++++++++++++++ fs/overlayfs/overlayfs.h | 7 +++ fs/overlayfs/ovl_entry.h | 6 ++- fs/overlayfs/super.c | 103 ++++++++++++++++++++++++--------------- fs/overlayfs/util.c | 42 ++++++++++++++++ 5 files changed, 174 insertions(+), 41 deletions(-) -- 2.17.1
