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