Capturing the steps how I figured out hibernation on LUKS with swap file in Btrfs subvolume.
The Laptop already have WIN10 installed. I want to install Linux on encrypted partition and without touching WIN10 even it’s efi to have dual bootable system. Hence need to create separate /boot/efi to keep WIN10 boot loader separate.
- Disk partition
Using USB installer of Qounos release prepared following partitios
- /boot/efi 512 MB - FAT32
- Rest free space as single LUKS partition
- Format LUKS with SSD friendly BTRFS file system
- Complete Installation adding / and /home as brtfs subvolume
btrfs subvolume list /
ID 256 gen 1794 top level 5 path @
ID 257 gen 1794 top level 5 path @home
/etc/fstab
UUID=6BAE-9722 /boot/efi vfat umask=0077 0 2
/dev/mapper/luks-82396eb2-fed3-4b13-8e27-10c92afd231a / btrfs subvol=/@,defaults 0 0
/dev/mapper/luks-82396eb2-fed3-4b13-8e27-10c92afd231a /home btrfs subvol=/@home,defaults 0 0
-
Tested system after installation completion and Dual booting is working fine
-
swap file preparation inside encrypted LUKS
Btrfs on Linux kernel after version 5.0 does support swap files.
Put swap file in a dedicated subvolume to avoid timeshift error:
Text file busy / btrfs returned an error: 256 / Failed to create snapshot
mount the top-level root btrfs filesystem, which always has id 5 [ref: swap-inside-subvolume]
mkdir /btrfs_pool
mount -o subvolid=5 /dev/mapper/cryptdata /btrfs_pool
ls /btrfs_pool
# @ @home
btrfs subvolume create /btrfs_pool/@swap
ls /btrfs_pool
# @ @home @swap
truncate -s 0 /btrfs_pool/@swap/swapfile
chattr +C /btrfs_pool/@swap/swapfile
btrfs property set /btrfs_pool/@swap/swapfile compression none
fallocate -l 16G /btrfs_pool/@swap/swapfile
chmod 600 /btrfs_pool/@swap/swapfile
mkswap /btrfs_pool/@swap/swapfile
# Setting up swapspace version 1, size = 16 GiB
# no label, UUID=23cd89op-c158-4126-8389-5d56c0965uUp
mkdir /btrfs_pool/@/swap
I have created 16 GB swapfile ( RAM x2) and in the last line created the folder /swap to mount @swap subvolume. Finally unmount the pool
umount /btrfs_pool
Now add swap into /etc/fstab. First mount subvolume, then swapfile
/dev/mapper/luks-82396eb2-fed3-4b13-8e27-10c92afd231a /swap btrfs subvol=/@swap,compress=no 0 0
/swap/swapfile none swap defaults 0 0
- Install the hibernator binary and run to add necessary parameters to boot loader.
sudo pacman -S hibernator
sudo hibernator
Adding the necessary kernel parameters to your bootloaders
Generating grub configuration file ...
Found theme: /usr/share/grub/themes/manjaro/theme.txt
Found linux image: /boot/vmlinuz-5.15-x86_64
Found initrd image: /boot/amd-ucode.img /boot/initramfs-5.15-x86_64.img
Found initrd fallback image: /boot/initramfs-5.15-x86_64-fallback.img
Found linux image: /boot/vmlinuz-5.15-rt-x86_64
Found initrd image: /boot/amd-ucode.img /boot/initramfs-5.15-rt-x86_64.img
Found initrd fallback image: /boot/initramfs-5.15-rt-x86_64-fallback.img
Warning: os-prober will be executed to detect other bootable partitions.
Its output will be used to detect bootable binaries on them and create new boot entries.
Found Windows Boot Manager on /dev/nvme0n1p1@/efi/Microsoft/Boot/bootmgfw.efi
Adding boot menu entry for UEFI Firmware Settings ...
Detecting snapshots ...
Found snapshot: 2022-04-16 02:04:35 | timeshift-btrfs/snapshots/2022-04-16_02-04-35/@ | ondemand | N/A |
Found snapshot: 2022-04-16 00:45:18 | timeshift-btrfs/snapshots/2022-04-16_00-45-18/@ | ondemand | N/A |
Found snapshot: 2022-04-15 23:36:47 | timeshift-btrfs/snapshots/2022-04-15_23-36-47/@ | ondemand | N/A |
Found 3 snapshot(s)
Unmount /tmp/grub-btrfs.ztD4nAdvia .. Success
Found memtest86+ image: /boot/memtest86+/memtest.bin
done
Resume hook was already present
- Adding Kernel parameters for hibernation
swap file requiresresume=swap_deviceandresume_offset=swap_file_offset
To get resume_offset value we need to calculate ( PHYSICAL OFFSET / PAGESIZE ) ref: arch-hibernate
Download tool btrfs_map_physical.c and compile the tool to collect Physical offset
gcc -O2 -o btrfs_map_physical btrfs_map_physical.c
( Do not try to use the filefrag tool, on Btrfs the “physical” offset reported by filefrag is not the real physical offset on disk)
./btrfs_map_physical /swap/swapfile
FILE OFFSET FILE SIZE EXTENT OFFSET EXTENT TYPE LOGICAL SIZE LOGICAL OFFSET PHYSICAL SIZE DEVID PHYSICAL OFFSET
0 4096 0 regular 268435456 50496294912 268435456 151578425344
4096 268431360 4096 prealloc 268435456 50496294912 268435456 1 51578425344
268435456 268435456 0 prealloc 268435456 50764730368 268435456 1 51846860800
536870912 268435456 0 prealloc 268435456 51033165824 268435456 1 52115296256
805306368 268435456 0 prealloc 268435456 57646301184 268435456 1 58728431616
1073741824 268435456 0 prealloc 268435456 92032466944 268435456 1 77008470016
1342177280 268435456 0 prealloc 268435456 92372205568 268435456 1 35472277504
1610612736 268435456 0 prealloc 268435456 92640641024 268435456 1 35740712960
1879048192 268435456 0 prealloc 268435456 92909076480 268435456 1 36009148416
2147483648 268435456 0 prealloc 268435456 93177511936 268435456 1 36277583872
2415919104 268435456 0 prealloc 268435456 93445947392 268435456 1 36546019328
2684354560 268435456 0 prealloc 268435456 93714382848 268435456 1 36814454784
2952790016 268435456 0 prealloc 268435456 93982818304 268435456 1 37082890240
3221225472 268435456 0 prealloc 268435456 94251253760 268435456 1 37351325696
3489660928 268435456 0 prealloc 268435456 94519689216 268435456 1 37619761152
3758096384 268435456 0 prealloc 268435456 94788124672 268435456 1 37888196608
4026531840 268435456 0 prealloc 268435456 95056560128 268435456 1 38156632064
4294967296 268435456 0 prealloc 268435456 95324995584 268435456 1 38425067520
4563402752 268435456 0 prealloc 268435456 95593431040 268435456 1 38693502976
4831838208 268435456 0 prealloc 268435456 95861866496 268435456 1 38961938432
5100273664 268435456 0 prealloc 268435456 96130301952 268435456 1 39230373888
5368709120 268435456 0 prealloc 268435456 96398737408 268435456 1 39498809344
5637144576 268435456 0 prealloc 268435456 96667172864 268435456 1 39767244800
5905580032 268435456 0 prealloc 268435456 96935608320 268435456 1 40035680256
6174015488 268435456 0 prealloc 268435456 97204043776 268435456 1 40304115712
6442450944 268435456 0 prealloc 268435456 97472479232 268435456 1 40572551168
6710886400 268435456 0 prealloc 268435456 97740914688 268435456 1 40840986624
6979321856 268435456 0 prealloc 268435456 98009350144 268435456 1 41109422080
7247757312 268435456 0 prealloc 268435456 98277785600 268435456 1 41377857536
7516192768 268435456 0 prealloc 268435456 98546221056 268435456 1 41646292992
7784628224 268435456 0 prealloc 268435456 98814656512 268435456 1 41914728448
8053063680 268435456 0 prealloc 268435456 99083091968 268435456 1 42183163904
8321499136 268435456 0 prealloc 268435456 99351527424 268435456 1 42451599360
8589934592 268435456 0 prealloc 268435456 99619962880 268435456 1 42720034816
8858370048 268435456 0 prealloc 268435456 99888398336 268435456 1 42988470272
9126805504 268435456 0 prealloc 268435456 100156833792 268435456 1 43256905728
9395240960 268435456 0 prealloc 268435456 100425269248 268435456 1 43525341184
9663676416 268435456 0 prealloc 268435456 100693704704 268435456 1 43793776640
9932111872 268435456 0 prealloc 268435456 100962140160 268435456 1 44062212096
10200547328 268435456 0 prealloc 268435456 101230575616 268435456 1 44330647552
10468982784 268435456 0 prealloc 268435456 101499011072 268435456 1 44599083008
10737418240 268435456 0 prealloc 268435456 101767446528 268435456 1 44867518464
11005853696 268435456 0 prealloc 268435456 102035881984 268435456 1 45135953920
11274289152 268435456 0 prealloc 268435456 102304317440 268435456 1 45404389376
11542724608 268435456 0 prealloc 268435456 102572752896 268435456 1 45672824832
11811160064 268435456 0 prealloc 268435456 102841188352 268435456 1 45941260288
12079595520 268435456 0 prealloc 268435456 103109623808 268435456 1 46209695744
12348030976 268435456 0 prealloc 268435456 103378059264 268435456 1 46478131200
12616466432 268435456 0 prealloc 268435456 103646494720 268435456 1 46746566656
12884901888 268435456 0 prealloc 268435456 103914930176 268435456 1 47015002112
13153337344 268435456 0 prealloc 268435456 104183365632 268435456 1 47283437568
13421772800 268435456 0 prealloc 268435456 104451801088 268435456 1 47551873024
13690208256 268435456 0 prealloc 268435456 104720236544 268435456 1 47820308480
13958643712 268435456 0 prealloc 268435456 104988672000 268435456 1 48088743936
14227079168 268435456 0 prealloc 268435456 105257107456 268435456 1 48357179392
14495514624 268435456 0 prealloc 268435456 105525542912 268435456 1 48625614848
14763950080 268435456 0 prealloc 268435456 105793978368 268435456 1 48894050304
15032385536 268435456 0 prealloc 268435456 106062413824 268435456 1 49162485760
15300820992 268435456 0 prealloc 268435456 106330849280 268435456 1 49430921216
15569256448 268435456 0 prealloc 268435456 106599284736 268435456 1 49699356672
15837691904 268435456 0 prealloc 268435456 106867720192 268435456 1 49967792128
16106127360 268435456 0 prealloc 268435456 107136155648 268435456 1 50236227584
16374562816 268435456 0 prealloc 268435456 107404591104 268435456 1 50504663040
16642998272 268435456 0 prealloc 268435456 107673026560 268435456 1 50773098496
16911433728 268435456 0 prealloc 268435456 107941462016 268435456 1 51041533952
Captured the first physical offset for the calculation. The PAGESIZE can be identified by
# getconf PAGESIZE
4096
Now modify the /etc/default/grub to add root , resume and resume_offset at GRUB_CMDLINE_LINUX_DEFAULT
GRUB_CMDLINE_LINUX_DEFAULT=“quiet cryptdevice=UUID=82396eb2-fed3-4b13-8e27-10c92afd231a:luks-82396eb2-fed3-4b13-8e27-10c92afd231a root=/dev/mapper/luks-82396eb2-fed3-4b13-8e27-10c92afd231a resume=/dev/mapper/luks-82396eb2-fed3-4b13-8e27-10c92afd231a resume_offset=12592389”
apply the modification
sudo update-grub
and reboot to get the kernel parameters enabled.
- Finally the Hibernation
If everything goes fine you can now have the hibernation working. Check it by
sudo systemctl hibernate