linux-kernel - [PATCH 0/2] overlayfs: C/R enhancements

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Message-Id: <20200604161133.20949-1-alexander.mikhalitsyn@virtuozzo.com>
Date:   Thu,  4 Jun 2020 19:11:31 +0300
From:   Alexander Mikhalitsyn <alexander.mikhalitsyn@...tuozzo.com>
To:     miklos@...redi.hu
Cc:     avagin@...nvz.org, ptikhomirov@...tuozzo.com,
        khorenko@...tuozzo.com, vvs@...tuozzo.com, ktkhai@...tuozzo.com,
        Alexander Mikhalitsyn <alexander.mikhalitsyn@...tuozzo.com>,
        linux-unionfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 0/2] overlayfs: C/R enhancements

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