#StackBounty: #linux #fedora #hibernate #btrfs #luks btrfs, LUKS, swapfile: How to hibernate on swapfile?

Bounty: 50

I’m using btrfs encrypted by LUKS on fedora 32 silverblue, kernel version 5.7.7 with anaconda installer default setting.

Because fedora installer automatic partition does not add swap partition or file (or I’ve done wrong), I added swapfile on myself for hibernation like this:

$ # swapfile under /var directory because the location is the only part user can modify on fedora silverblue
$ touch /var/swapfile
$ chattr +C /var/swapfile 
$ fallocate --length 10GiB /var/swapfile
$ sudo chown root /var/swapfile 
$ sudo chmod 600 /var/swapfile 
$ sudo mkswap /var/swapfile 
$ sudo swapon /var/swapfile

and I added swapfile_t attr for selinux:

$ ls -Z /var/swapfile
unconfined_u:object_r:swapfile_t:s0 /var/swapfile

Then I followed arch wiki instruction(https://wiki.archlinux.org/index.php/Power_management/Suspend_and_hibernate#Hibernation_into_swap_file_on_Btrfs).

my /var/swapfile‘s physical offset is 19793240064 and page size is 4096, so I added kernel param with grub. here’s part of my /etc/default/grub kernel params now:

GRUB_CMDLINE_LINUX="rd.luks.uuid=luks-572bfd87-6fa7-4be1-8c73-4759ac9af3cd rhgb quiet resume=UUID=572bfd87-6fa7-4be1-8c73-4759ac9af3cd resume_offset=4832334"

here’s my blkid:

$ sudo blkid
/dev/nvme0n1p1: UUID="5490-E733" BLOCK_SIZE="512" TYPE="vfat" PARTLABEL="EFI System Partition" PARTUUID="46ecd0d1-6722-4b92-af73-9574a58eb332"
/dev/nvme0n1p2: UUID="c9294f4d-9c92-4c08-a037-715223443f2b" BLOCK_SIZE="4096" TYPE="ext4" PARTUUID="731852d5-26cd-43bb-8904-c4256247f97d"
/dev/nvme0n1p3: UUID="572bfd87-6fa7-4be1-8c73-4759ac9af3cd" TYPE="crypto_LUKS" PARTUUID="e74de89a-fe5f-402f-a3bf-e398ad069b5b"
/dev/sda: BLOCK_SIZE="512" UUID="C602B4D602B4CD25" TYPE="ntfs"
/dev/mapper/luks-572bfd87-6fa7-4be1-8c73-4759ac9af3cd: LABEL="fedora_fedora" UUID="337b2fcb-a61b-4976-89ac-2b3feee02963" UUID_SUB="932cfe1c-9713-4063-bda0-a8a792654c39" BLOCK_SIZE="4096" TYPE="btrfs"

and hibernation failed. it seems resume parameter problem. I tried UUID=572bfd87-6fa7-4be1-8c73-4759ac9af3cd and UUID=337b2fcb-a61b-4976-89ac-2b3feee02963 and both failed. What were wrong? How can I setup swapfile hibernate properly?

I’ve checked journalctl -u systemd-logind and found the message but that didn’t help:

 localhost.localdomain systemd-logind[936]: Failed to open swap file /var/swapfile to determine on-disk offset: Permission denied

Get this bounty!!!

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