Bug 67431

Summary:	RFE: swap: support calling 'mkswap' on uninitialized swap units
Product:	systemd	Reporter:	Michał Górny <mgorny>
Component:	general	Assignee:	systemd-bugs
Status:	RESOLVED FIXED	QA Contact:	systemd-bugs
Severity:	enhancement
Priority:	medium	CC:	radek
Version:	unspecified
Hardware:	Other
OS:	All
Whiteboard:
i915 platform:		i915 features:

Description Michał Górny 2013-07-28 08:49:50 UTC

I'm using two zram devices for swap. By design, those devices are created at boot and are uninitialized.

It would be great if systemd had a simple 'Initialize=' boolean that would enable calling 'mkswap' to initialize the swap space. Preferably, with an fstab option to enable it transparently.

Comment 1 Tom Gundersen 2013-08-06 14:59:52 UTC

If we do this, we should make sure to first check that the swap partition does not contain a valid filesystem. This stuff could probably also be used for the encrypted swap stuff in our crypttab generator.

Comment 2 Lennart Poettering 2013-09-12 17:34:28 UTC

This is really dangerous business...

Comment 3 Radek Podgorny 2014-07-01 23:57:09 UTC

agreed, this could really destroy (potentially important) data.

Comment 4 Lennart Poettering 2018-08-08 15:30:47 UTC

We nowadays have this in place. Simply add "x-systemd.makefs" to your fstab mount options (or if you use a .swap unit directly pull in and order it after systemd-makefs@$DEVICE.service).

Closing hence.

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