[Bug 1581801] Re: UUID base RESUME always wait 5 seconds for activating LVM swap

[Benjamin Drung]

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** Changed in: initramfs-tools (Ubuntu)
       Status: Confirmed => Incomplete

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Title:
  UUID base RESUME always wait 5 seconds for activating LVM swap

Status in initramfs-tools package in Ubuntu:
  Incomplete

Bug description:
  Ubuntu 16.04 with LVM have delay around LVM mount.

    $ dmesg
    <snip>
    [    1.126338] FDC 0 is a S82078B
    [    1.830136] tsc: Refined TSC clocksource calibration: 3392.321 MHz
    [    1.830140] clocksource: tsc: mask: 0xffffffffffffffff max_cycles:
    0x30e5f904771, max_idle_ns: 440795373543 ns
    [    6.984151] EXT4-fs (dm-0): mounted filesystem with ordered data
    mode. Opts: (null)
    [   10.421370] systemd[1]: systemd 229 running in system mode.
    (+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP
    +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ -LZ4 +SECCOMP +BLKID
    +ELFUTILS +KMOD -IDN)
    [   10.421397] systemd[1]: Detected virtualization kvm.
    <snip>

  LVM partition will be activated by scripts/local-top/lvm2 in initrd.
  But scripts/local-top/lvm2 does not take care of resume variable which
  is set from UUID base RESUME.

    $ cat /usr/share/initramfs-tools/scripts/local-top/lvm2
    <snip>
    activate() {
    <snip>
      /dev/mapper/*)
      <snip>
    }

    activate "$ROOT"
    activate "$resume"
    <snip>

  And then, scripts/local-premount/resume in initrd will always wait 5
  seconds for activating LVM swap.
  After mounting root filesystem, systemd will activate LVM swap.

    $ cat /usr/share/initramfs-tools/scripts/local-premount/resume
    <snip>
    SWAPTYPE=$(wait-for-root "${resume}" ${RESUMEDELAY:-5})
    <snip>

  RESUME is defined at /etc/initramfs-tools/conf.d/resume which is
  created by plugininstall.py.
  So plugininstall.py needs to support non-UUID base RESUME,
  e.g. RESUME=/dev/mapper/ubuntu--vg-swap_1.

    $ sudo su -c 'echo RESUME=/dev/mapper/ubuntu--vg-swap_1 \
    > /etc/initramfs-tools/conf.d/resume'
    $ sudo update-initramfs -u && sudo reboot

    $ dmesg # after boot
    <snip>
    [    1.095876] FDC 0 is a S82078B
    [    1.507060] EXT4-fs (dm-0): mounted filesystem with ordered data
    mode. Opts: (null)
    [    1.807522] tsc: Refined TSC clocksource calibration: 3392.321 MHz
    [    1.807526] clocksource: tsc: mask: 0xffffffffffffffff max_cycles:
    0x30e5f904771, max_idle_ns: 440795373543 ns
    [    2.648513] systemd[1]: systemd 229 running in system mode.
    (+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP
    +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ -LZ4 +SECCOMP +BLKID
    +ELFUTILS +KMOD -IDN)
    [    2.648542] systemd[1]: Detected virtualization kvm.

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