On 4/17/20 9:13 AM, Patrick O'Callaghan wrote:
On Fri, 2020-04-17 at 15:37 +0000, Sreyan Chakravarty wrote:
On Thu, 2020-04-16 at 17:12 -0700, Samuel Sieb wrote:
It has to be a partition. A file can be on any kind of filesystem, so
how would the resume function know what to do?
From systemd-hibernate-resume(8):
systemd-hibernate-resume@.service initiates the resume from hibernation. It is
instantiated with the device to resume from as the template argument.
systemd-hibernate-resume only supports the in-kernel hibernation implementation, known as
swsusp[1]. Internally, it works by writing the major:minor of specified device node to
/sys/power/resume.
If you see the documentation about swsusp here:
https://www.kernel.org/doc/Documentation/power/swsusp.txt
It clearly states you can use a swap file.
Now I am confused as to why you say a swap file won't work.
From bootparam(8):
'resume=...'
This tells the kernel the location of the suspend-to-disk data that you want the machine to resume from after hibernation.
Usually, it is the same as your swap partition or file. Example:
resume=/dev/hda2
There is no corresponding entry for resume_offset. I don't know if that's because Fedora doesn't support it.
From the header of that man page, it's an "introduction to boot time
parameters", not an exhaustive summary. As far as I can tell, it is
valid to use a swap file for hibernation. That parameter is in the
kernel. You just need to get the right offset to the file.
I've learned something new which might actually be useful at some point.
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