mount units

[Johannes Köhler <koehler.johannes@xxxxxxxxxxxxxx>]

All HI systemdgroup,

i found a special behavior with btrfs and systemd mount.

BTRFS is partly diverting its "subvolume" technics from
the functional intended usage: A "subvolume" is usable
like an directory. The documentation indicates such
possibility, also. E.g.: The User can replace the
recursive delete command on directories with a
btrfs command.

https://www.oracle.com/technical-resources/articles/it-infrastructure/admin-advanced-btrfs.html

Triggered by this suggestion i tried to use a
btrfs subvolume as mount directory inside of an
systemd mount unit. And, spring success on myself.

Then, came a question into being. Appears a btrfs
subvolume to the system mount service with the aspect
of a directory, and btrfs subvolume features a not
capable anymore? (Owing to, btrfs is falling back into
a classical directory...) Or: both systems
are lying next to each other without interference
and with full feature set. E.g. snapshots with btrfs
or changed directory mode through systemd after mounting.

sincerely
-kefko

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