modules.d/90lvm/lvm_scan.sh

   1 #!/bin/sh
   2 # -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
   3 # ex: ts=8 sw=4 sts=4 et filetype=sh
   4
   5 # run lvm scan if udev has settled
   6
   7 extraargs="$@"
   8 type getarg >/dev/null 2>&1 || . /lib/dracut-lib.sh
   9
  10 VGS=$(getargs rd.lvm.vg -d rd_LVM_VG=)
  11 LVS=$(getargs rd.lvm.lv -d rd_LVM_LV=)
  12 SNAPSHOT=$(getargs rd.lvm.snapshot -d rd_LVM_SNAPSHOT=)
  13 SNAPSIZE=$(getargs rd.lvm.snapsize -d rd_LVM_SNAPSIZE=)
  14
  15 [ -d /etc/lvm ] || mkdir -m 0755 -p /etc/lvm
  16 # build a list of devices to scan
  17 lvmdevs=$(
  18     for f in /tmp/.lvm_scan-*; do
  19         [ -e "$f" ] || continue
  20         echo -n "${f##/tmp/.lvm_scan-} "
  21     done
  22 )
  23
  24 if [ ! -e /etc/lvm/lvm.conf ]; then
  25     {
  26         echo 'devices {';
  27         echo -n '    filter = [ '
  28         for dev in $lvmdevs; do
  29             printf '"a|^/dev/%s$|", ' $dev;
  30         done;
  31         echo '"r/.*/" ]';
  32         echo '}';
  33
  34         # establish LVM locking
  35         if [ -n $SNAPSHOT ]; then
  36             echo 'global {';
  37             echo '    locking_type = 1';
  38             echo '    use_lvmetad = 0';
  39             echo '}';
  40         else
  41             echo 'global {';
  42             echo '    locking_type = 4';
  43             echo '    use_lvmetad = 0';
  44             echo '}';
  45         fi
  46     } > /etc/lvm/lvm.conf
  47     lvmwritten=1
  48 fi
  49
  50 check_lvm_ver() {
  51     maj=$1
  52     min=$2
  53     ver=$3
  54     # --poll is supported since 2.2.57
  55     [ $4 -lt $maj ] && return 1
  56     [ $4 -gt $maj ] && return 0
  57     [ $5 -lt $min ] && return 1
  58     [ $5 -gt $min ] && return 0
  59     [ $6 -ge $ver ] && return 0
  60     return 1
  61 }
  62
  63 # hopefully this output format will never change, e.g.:
  64 #   LVM version:     2.02.53(1) (2009-09-25)
  65 OLDIFS=$IFS
  66 IFS=.
  67 set $(lvm version 2>/dev/null)
  68 IFS=$OLDIFS
  69 maj=${1##*:}
  70 min=$2
  71 sub=${3%% *}
  72 sub=${sub%%\(*};
  73
  74 check_lvm_ver 2 2 57 $maj $min $sub && \
  75     nopoll="--poll n"
  76
  77 if check_lvm_ver 2 2 65 $maj $min $sub; then
  78     sysinit=" --sysinit $extraargs"
  79 fi
  80
  81 unset extraargs
  82
  83 export LVM_SUPPRESS_LOCKING_FAILURE_MESSAGES=1
  84
  85 if [ -n "$SNAPSHOT" ] ; then
  86     # HACK - this should probably be done elsewhere or turned into a function
  87     # Enable read-write LVM locking
  88     sed -i -e 's/\(^[[:space:]]*\)locking_type[[:space:]]*=[[:space:]]*[[:digit:]]/\1locking_type =  1/' ${initdir}/etc/lvm/lvm.conf
  89
  90     # Expected SNAPSHOT format "<orig lv name>:<snap lv name>"
  91     ORIG_LV=${SNAPSHOT%%:*}
  92     SNAP_LV=${SNAPSHOT##*:}
  93
  94     info "Removing existing LVM snapshot $SNAP_LV"
  95     lvm lvremove --force $SNAP_LV 2>&1| vinfo
  96
  97     # Determine snapshot size
  98     if [ -z "$SNAPSIZE" ] ; then
  99         SNAPSIZE=$(lvm lvs --noheadings  --units m --options lv_size $ORIG_LV)
 100         info "No LVM snapshot size provided, using size of $ORIG_LV ($SNAPSIZE)"
 101     fi
 102
 103     info "Creating LVM snapshot $SNAP_LV ($SNAPSIZE)"
 104     lvm lvcreate -s -n $SNAP_LV -L $SNAPSIZE $ORIG_LV 2>&1| vinfo
 105 fi
 106
 107 if [ -n "$LVS" ] ; then
 108     info "Scanning devices $lvmdevs for LVM logical volumes $LVS"
 109     lvm lvscan --ignorelockingfailure 2>&1 | vinfo
 110     if [ -z "$sysinit" ]; then
 111         lvm lvchange -ay --ignorelockingfailure $nopoll --ignoremonitoring $LVS 2>&1 | vinfo
 112     else
 113         lvm lvchange -ay $sysinit $LVS 2>&1 | vinfo
 114     fi
 115 fi
 116
 117 if [ -z "$LVS" -o -n "$VGS" ]; then
 118     info "Scanning devices $lvmdevs for LVM volume groups $VGS"
 119     lvm vgscan --ignorelockingfailure 2>&1 | vinfo
 120     if [ -z "$sysinit" ]; then
 121         lvm vgchange -ay --ignorelockingfailure $nopoll --ignoremonitoring $VGS 2>&1 | vinfo
 122     else
 123         lvm vgchange -ay $sysinit $VGS 2>&1 | vinfo
 124     fi
 125 fi
 126
 127 if [ "$lvmwritten" ]; then
 128     rm -f /etc/lvm/lvm.conf
 129 fi
 130 unset lvmwritten
 131
 132 udevadm settle
 133
 134 need_shutdown