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I have writethrough bcache working on Debian Sid with an underlying LUKS + LVM. My swap partition (already present) is lying unused as an LVM volume.

I know that I am supposed to stop bcache before hibernation (suspend to disk), and resume bcache after resume (cannot be active during either).

How exactly do I ensure that? Are there are any pre- and post- scripts for this? If so, how should stop and restart bcache. All that echo n > /sys ... business can go remarkably awry if one does not know what one is doing.

Getting hibernation working is the last pending thing after the install.

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At this point you probably have figured it out on your own, abandoned bcache, or lived without hibernation but this is how I am doing it:

Following the arch guide for resume/hibernate hooks with systemd: I created a service /etc/systemd/system/bcache-suspend.service

[Unit]
Description=Disable bcache chaching
Before=sleep.target suspend.target hibernate.target hybrid-sleep.target suspend-then-hibernate.target

[Service]
Type=simple
ExecStart=/usr/bin/bash -c "echo none > /sys/block/bcache0/bcache/cache_mode"

[Install]
WantedBy=sleep.target suspend.target hibernate.target hybrid-sleep.target suspend-then-hibernate.target

and a similar one, /etc/systemd/system/bcache-resume.service

[Unit]
Description=Re-enable bcache chaching
After=sleep.target suspend.target hibernate.target hybrid-sleep.target suspend-then-hibernate.target

[Service]
Type=simple
ExecStart=/usr/bin/bash -c "echo writeback > /sys/block/bcache0/bcache/cache_mode"

[Install]
WantedBy=sleep.target suspend.target hibernate.target hybrid-sleep.target suspend-then-hibernate.target

Also don't forget to enable the services systemctl enable bcache-resume.service and systemctl enable bcache-suspend.service.

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