[elbe-devel] [PATCH v2 0/3] Add support for nested btrfs subvolume hierarchies

[daniel at braunwarth.dev]

November 3, 2022 at 6:10 PM, "Daniel Braunwarth" <daniel at braunwarth.dev> wrote:


> 
> Btrfs supports three subvolume hierarchies: flat, nested and mixed. Detailed
> explanations of each can be found at the btrfs SysadminGuide:
> 
> https://btrfs.wiki.kernel.org/index.php/SysadminGuide#Layout
> 
> This series of patches adds support for nested btrfs subvolume hierarchies. I'm
> planning to add support for flat and mixed hierarchies in a second step.
> 
> With this patches applied the following subvolume hierarchy can be easily
> achieved:
> 
> toplevel (volume root directory, to be mounted at /)
> +-- home (subvolume root directory)
> +-- var (subvolume root directory)
>  +-- www (subvolume root directory)
>  +-- lib (directory)
>  \-- postgresql (subvolume root directory)
> 
> The following ELBE XML snippet would create this:
> 
> <fstab>
>  <bylabel>
>  <label>rfs</label>
>  <mountpoint>/</mountpoint>
>  <fs>
>  <type>btrfs</type>
>  <subvolumes>
>  <subvolume>
>  <name>home</name>
>  </subvolume>
>  <subvolume>
>  <name>var</name>
>  </subvolume>
>  <subvolume>
>  <name>var/www</name>
>  </subvolume>
>  <subvolume>
>  <name>var/lib/postgresql</name>
>  </subvolume>
>  </subvolumes>
>  </fs>
>  </bylabel>
> </fstab>
> 
> Changes since v1:
> - Update example's "created" date
> - Add SPDX header to example
> 
> Daniel Braunwarth (3):
>  examples: add btrfs nested subvolumes example
>  schema: fs: extend XML schema for btrfs subvolumes
>  elbe: add logic for nested btrfs subvolumes
> 
>  elbepack/fstab.py | 10 ++
>  elbepack/hdimg.py | 12 ++-
>  ...64-pc-btrfs-nested-subvolumes-bullseye.xml | 95 +++++++++++++++++++
>  schema/dbsfed.xsd | 43 +++++++++
>  4 files changed, 158 insertions(+), 2 deletions(-)
>  create mode 100644 examples/x86_64-pc-btrfs-nested-subvolumes-bullseye.xml
> 
> --
> 2.38.1
>

May I ask for any feedback here?