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howtos:slackware_admin:swapfile_hibernation [2012/12/01 13:31 (UTC)]
fl0 [Sources]
howtos:slackware_admin:swapfile_hibernation [2012/12/01 20:32 (UTC)] (current)
sycamorex Syntax cleanup
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 ====== Hibernation with LVM, LUKS and a Swapfile  ====== ====== Hibernation with LVM, LUKS and a Swapfile  ======
  
-With this How To you can use a swapfile instead a swap partition as described here: +With this How To you can use a swap file instead a swap partition as described [[http://slackware.osuosl.org/slackware-14.0/README_CRYPT.TXT|here]].
-[[http://slackware.osuosl.org/slackware-14.0/README_CRYPT.TXT]]+
  
-First create a swapfile: (you can choose another name and / or size if you want)+First create a swap file (you can choose another name and / or size if you want):
  
   dd if=/dev/zero of=/swapfile bs=1M count=4096   dd if=/dev/zero of=/swapfile bs=1M count=4096
   mkswap /swapfile    mkswap /swapfile 
  
-Activate the Swap:+Activate the swap:
   swapon /swapfile   swapon /swapfile
  
-Check if the Swapfile is recognized by the system:+Check if the swap file is recognized by the system:
   cat /proc/swaps    cat /proc/swaps 
   Filename                                Type            Size    Used    Priority   Filename                                Type            Size    Used    Priority
Line 22: Line 21:
  
  
-For suspend/resume you need to append 2 kernel Parameter in /etc/lilo.conf resume and resume_offset.+For suspend/resume you need to append 2 kernel parameter in /etc/lilo.conf resume and resume_offset.
  
-resume is the partition where the swapfile is located (e.g /dev/sda, /dev/cryptslack/root) +''resume'' is the partition where the swap file is located (e.g /dev/sda, /dev/cryptslack/root) 
-resume_offset is the beginning of the swapfile on the resume partition, you can get the offset with+''resume_offset'' is the beginning of the swap file on the resume partition, you can get the offset with:
   sudo /sbin/filefrag -v /swapfile | head -n -3 | tail -n 1 | awk ' {print $3 }'   sudo /sbin/filefrag -v /swapfile | head -n -3 | tail -n 1 | awk ' {print $3 }'
  
-your lilo entry should look like this:+Your ''lilo'' entry should look like this:
   # Append any additional kernel parameters:   # Append any additional kernel parameters:
    append="vt.default_utf8=1 resume=/dev/cryptslack/root resume_offset=1134591"    append="vt.default_utf8=1 resume=/dev/cryptslack/root resume_offset=1134591"
  
-    
 You need to patch the initrd to recognize the resume_offset parameter You need to patch the initrd to recognize the resume_offset parameter
 +<file patch init-swapfile.patch>
 +--- init.orig   2012-12-01 14:03:39.344538490 +0100                                                                                                            
 ++++ init        2012-12-01 14:01:12.526373970 +0100                                                                                                            
 +@@ -69,6 +69,7 @@                                                                                                                                              
 + LUKSDEV=$(cat /luksdev)                                                                                                                                       
 + LUKSKEY=$(cat /lukskey)                                                                                                                                       
 + RESUMEDEV=$(cat /resumedev)                                                                                                                                   
 ++RESOFFSET=$(cat /resoffset)                                                                                                                                   
 + WAIT=$(cat /wait-for-root)                                                                                                                                    
 + KEYMAP=$(cat /keymap)                                                                                                                                         
 + INIT=/sbin/init                                                                                                                                               
 +@@ -269,18 +270,35 @@
 +     umount -l /mountkey
 +     rmdir /mountkey 2>/dev/null
 +   fi
 +-  
 +-  # Resume state from swap
 +-  if [ "$RESUMEDEV" != "" ]; then
 +-    if ls -l $RESUMEDEV | grep -q "^l" ; then
 +-      #RESUMEDEV=$(ls -l $RESUMEDEV | awk '{ print $NF }')
 +-      RESUMEDEV=$(readlink -f $RESUMEDEV)
 +-    fi
 +-    echo "Trying to resume from $RESUMEDEV"
 +-    RESMAJMIN=$(ls -l $RESUMEDEV | tr , : | awk '{ print $5$6 }')
 +-    echo $RESMAJMIN > /sys/power/resume
 +-  fi
 +-
 +
 ++if [ "$RESUMEDEV" != "" ]; then
 ++       # be lvm aware
 ++        RESUMEDEV=$(readlink -f ${RESUMEDEV} | awk -F '/' '{ print $3 }')
 ++       if [ -r "/sys/class/block/${RESUMEDEV}/dev" ] ; then
 ++       # try sysfs 
 ++               read RESMAJMIN < "/sys/class/block/${RESUMEDEV}/dev"
 ++       elif [ -r "/proc/partitions" ] ; then
 ++       # otherwise run through /proc/partitions
 ++               while read m n b d jnk ; do
 ++                       if [ "$d" = "${RESUMEDEV}" ] ; then
 ++                               RESMAJMIN="$m:$n"
 ++                               break
 ++                       fi
 ++               done < "/proc/partitions"
 ++               fi
 ++       if [ -z "${RESMAJMIN}" ] ; then
 ++               # Device does not exist (not found in /proc/partitions)
 ++               exit 99
 ++       fi
 ++
 ++       if [ -n "${RESOFFSET}" ]; then
 ++                echo "Try resume from ${RESMAJMIN}:${RESOFFSET}"
 ++               echo "${RESMAJMIN}:${RESOFFSET}" > /sys/power/resume
 ++       else
 ++               echo "${RESMAJMIN}" > /sys/power/resume
 ++       fi
 ++fi
 +
 +</file>
  
   mkdir patched_initrd   mkdir patched_initrd
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   patch < init-swapfile.patch   patch < init-swapfile.patch
  
-after successfull patching ,pack the initrd to /boot/initrd-swapfile.gz +After successful patching, pack the initrd to ''/boot/initrd-swapfile.gz'':
  
   find . -print0 | cpio -ov -0 --format=newc | gzip -9 > /boot/initrd-swapfile.gz   find . -print0 | cpio -ov -0 --format=newc | gzip -9 > /boot/initrd-swapfile.gz
  
-<note>recommend you to test this initrd first with another bootentry</note>+<note>recommend to test this initrd first with another boot entry</note>
   image = /boot/vmlinuz   image = /boot/vmlinuz
   initrd = /boot/initrd-swapfile.gz   initrd = /boot/initrd-swapfile.gz
Line 53: Line 108:
  
  
-then you need to run lilo to save the changes+Then you need to run lilo to save the changes
   lilo   lilo
  
-after a reboot you can suspend to your swapfile as with your swap partition  +After a reboot you can suspend to your swap file as with your swap partition  
-<note>you need the reboot, suspend also uses resume_offset to find the swapfile</note>+<note>You need the reboot, suspend also uses resume_offset to find the swap file</note>
    
 ====== Sources ====== ====== Sources ======
-Arch Linux Wiki: [[https://wiki.archlinux.org/index.php/Swap]]+  * [[https://wiki.archlinux.org/index.php/Swap]]
  
-* Originally written by [[wiki:user:fl0]]+  * [[https://answers.launchpad.net/ubuntu/+source/initramfs-tools/+question/193862]] 
 + 
 + 
 +  * Originally written by [[wiki:user:fl0]]
  
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