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Subject[PATCH 0/2] overlayfs: C/R enhancements
Date
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

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