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When configuring kernel for hibernation, RESUME boot option has to be provided with UUID for the swap partition.

If you're using a sawpfile instead of a swap partition, you have to go through a lot of hoops and still it isn't a stable setup if you're on SSD which trims regularly.

btrfs subvolumes also have UUIDs. I'm wondering, if I could use a subvolume as a swap partition for all intents and purposes? (or house a single swapfile in it. weirdly, mkswap also output a UUID when making the swapfile, which confused me a little)

I have no idea if the btrfs-related modules are loaded first or if kernel just wants to read blocks directly from disk first before doing anything else. Is this possible?

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