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--- hibernate_from_a_non_activate_swapfile_from_btrfs [2020/12/16 10:19] – memeruiz
+++ hibernate_from_a_non_activate_swapfile_from_btrfs [2020/12/17 13:02] – memeruiz
@@ Line 1: / Line 1: @@
 ====== Hibernate from a non activate swapfile from btrfs ======
+*** Important! *** This didn't work! It is not secure! When wiping happens, the file gets moved to another place by btrfs, then, this doesn't work for two reasons: 1) Wiping happens in other parts of the disk, and the offset changes and has to be updated in all configurations files after wiping everytime.
+* This was just a stupid experiment.
 ===== Create swapfile =====
@@ Line 65: / Line 69: @@
   * Modify /etc/default/grub with the corresponding resume and offset values:
-  GRUB_CMDLINE_LINUX_DEFAULT="resume=UUID=8f9ede3a-912f-40d6-9335-90ed3186e3e48f9ede3a-912f-40d6-9335-90ed3186e3e4 resume_offset=1121793 quiet btusb.enable_autosuspend=n"
+  GRUB_CMDLINE_LINUX_DEFAULT="resume=UUID=8f9ede3a-912f-40d6-9335-90ed3186e3e4 resume_offset=1121793 quiet btusb.enable_autosuspend=n"
   * Activate the swap file
@@ Line 112: / Line 116: @@
   echo "Hibernating"
   sleep 0.2
+  xtrlock -b &
   sudo s2disk
   echo "Returning from Hibernate"
@@ Line 119: / Line 124: @@
   sleep 5
   echo "Wiping swapfile"
-  sudo wipe -f -q -Q 1 /swap/swapfile
+  #sudo wipe -k -f -q -Q 1 /swap/swapfile
+  sudo dd if=/dev/zero of=/swap/swapfile bs=1M count=24576 status=progress #reserve 24GB
   sync
   sleep 1
@@ Line 125: / Line 131: @@
   sudo mkswap /swap/swapfile
   echo "All done, ready to hiberante again"
+===== References =====
+https://wiki.archlinux.org/index.php/Power_management/Suspend_and_hibernate#Hibernation_into_swap_file_on_Btrfs
+https://wiki.archlinux.org/index.php/Power_management/Suspend_and_hibernate#Hibernation_into_swap_file
+https://wiki.archlinux.org/index.php/Swap#Swap_file_creationhttps://wiki.archlinux.org/index.php/Swap#Swap_file_creation
+https://askubuntu.com/questions/6769/hibernate-and-resume-from-a-swap-file
+https://wiki.debian.org/Hibernation/Hibernate_Without_Swap_Partition
+https://wiki.debian.org/Hibernation
+https://unix.stackexchange.com/questions/521686/using-swapfile-for-hibernation-with-btrfs-and-kernel-5-0-16-gentoohttps://unix.stackexchange.com/questions/521686/using-swapfile-for-hibernation-with-btrfs-and-kernel-5-0-16-gentoo