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systemd-stable/units/var-lib-machines.mount
Lennart Poettering 5f7ecd610c import: drop logic of setting up /var/lib/machines as btrfs loopback mount
Let's simplify things and drop the logic that /var/lib/machines is setup
as auto-growing btrfs loopback file /var/lib/machines.raw.

THis was done in order to make quota available for machine management,
but quite frankly never really worked properly, as we couldn't grow the
file system in sync with its use properly. Moreover philosophically it's
problematic overriding the admin's choice of file system like this.

Let's hence drop this, and simplify things. Deleting code is a good
feeling.

Now that regular file systems provide project quota we could probably
add per-machine quota support based on that, hence the btrfs quota
argument is not that interesting anymore (though btrfs quota is a bit
more powerful as it allows recursive quota, i.e. that the machine pool
gets an overall quota in addition to per-machine quota).
2018-11-26 18:09:01 +01:00

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SYSTEMD

# SPDX-License-Identifier: LGPL-2.1+
#
# This file is part of systemd.
#
# systemd is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 of the License, or
# (at your option) any later version.
# This unit is required for pre-240 versions of systemd that automatically set
# up /var/lib/machines.raw as loopback-mounted btrfs file system. Later
# versions don't do that anymore, but let's keep minimal compatibility by
# mounting the image still, if it exists.
[Unit]
Description=Virtual Machine and Container Storage (Compatibility)
ConditionPathExists=/var/lib/machines.raw
[Mount]
What=/var/lib/machines.raw
Where=/var/lib/machines
Type=btrfs
Options=loop