modules.d/90lvm/lvm_scan.sh

   1 #!/bin/sh
   2
   3 # run lvm scan if udev has settled
   4
   5 extraargs="$@"
   6 type getarg >/dev/null 2>&1 || . /lib/dracut-lib.sh
   7
   8 VGS=$(getargs rd.lvm.vg -d rd_LVM_VG=)
   9 LVS=$(getargs rd.lvm.lv -d rd_LVM_LV=)
  10 SNAPSHOT=$(getargs rd.lvm.snapshot -d rd_LVM_SNAPSHOT=)
  11 SNAPSIZE=$(getargs rd.lvm.snapsize -d rd_LVM_SNAPSIZE=)
  12
  13 [ -d /etc/lvm ] || mkdir -m 0755 -p /etc/lvm
  14 # build a list of devices to scan
  15 lvmdevs=$(
  16     for f in /tmp/.lvm_scan-*; do
  17         [ -e "$f" ] || continue
  18         printf '%s' "${f##/tmp/.lvm_scan-} "
  19     done
  20 )
  21
  22 if [ ! -e /etc/lvm/lvm.conf ]; then
  23     {
  24         echo 'devices {';
  25         printf '    filter = [ '
  26         for dev in $lvmdevs; do
  27             printf '"a|^/dev/%s$|", ' $dev;
  28         done;
  29         echo '"r/.*/" ]';
  30         echo '}';
  31
  32         # establish LVM locking
  33         if [ -n $SNAPSHOT ]; then
  34             echo 'global {';
  35             echo '    locking_type = 1';
  36             echo '    use_lvmetad = 0';
  37             echo '}';
  38         else
  39             echo 'global {';
  40             echo '    locking_type = 4';
  41             echo '    use_lvmetad = 0';
  42             echo '}';
  43         fi
  44     } > /etc/lvm/lvm.conf
  45     lvmwritten=1
  46 fi
  47
  48 check_lvm_ver() {
  49     maj=$1
  50     min=$2
  51     ver=$3
  52     # --poll is supported since 2.2.57
  53     [ $4 -lt $maj ] && return 1
  54     [ $4 -gt $maj ] && return 0
  55     [ $5 -lt $min ] && return 1
  56     [ $5 -gt $min ] && return 0
  57     [ $6 -ge $ver ] && return 0
  58     return 1
  59 }
  60
  61 # hopefully this output format will never change, e.g.:
  62 #   LVM version:     2.02.53(1) (2009-09-25)
  63 OLDIFS=$IFS
  64 IFS=.
  65 set $(lvm version 2>/dev/null)
  66 IFS=$OLDIFS
  67 maj=${1##*:}
  68 min=$2
  69 sub=${3%% *}
  70 sub=${sub%%\(*};
  71
  72 lvm_ignorelockingfailure="--ignorelockingfailure"
  73 lvm_quirk_args="--ignorelockingfailure --ignoremonitoring"
  74
  75 check_lvm_ver 2 2 57 $maj $min $sub && \
  76     lvm_quirk_args="$lvm_quirk_args --poll n"
  77
  78 if check_lvm_ver 2 2 65 $maj $min $sub; then
  79     lvm_quirk_args=" --sysinit $extraargs"
  80 fi
  81
  82 if check_lvm_ver 2 2 221 $maj $min $sub; then
  83     lvm_quirk_args=" $extraargs"
  84     unset lvm_ignorelockingfailure
  85 fi
  86
  87 unset extraargs
  88
  89 export LVM_SUPPRESS_LOCKING_FAILURE_MESSAGES=1
  90
  91 if [ -n "$SNAPSHOT" ] ; then
  92     # HACK - this should probably be done elsewhere or turned into a function
  93     # Enable read-write LVM locking
  94     sed -i -e 's/\(^[[:space:]]*\)locking_type[[:space:]]*=[[:space:]]*[[:digit:]]/\1locking_type =  1/' ${initdir}/etc/lvm/lvm.conf
  95
  96     # Expected SNAPSHOT format "<orig lv name>:<snap lv name>"
  97     ORIG_LV=${SNAPSHOT%%:*}
  98     SNAP_LV=${SNAPSHOT##*:}
  99
 100     info "Removing existing LVM snapshot $SNAP_LV"
 101     lvm lvremove --force $SNAP_LV 2>&1| vinfo
 102
 103     # Determine snapshot size
 104     if [ -z "$SNAPSIZE" ] ; then
 105         SNAPSIZE=$(lvm lvs --noheadings  --units m --options lv_size $ORIG_LV)
 106         info "No LVM snapshot size provided, using size of $ORIG_LV ($SNAPSIZE)"
 107     fi
 108
 109     info "Creating LVM snapshot $SNAP_LV ($SNAPSIZE)"
 110     lvm lvcreate -s -n $SNAP_LV -L $SNAPSIZE $ORIG_LV 2>&1| vinfo
 111 fi
 112
 113 if [ -n "$LVS" ] ; then
 114     info "Scanning devices $lvmdevs for LVM logical volumes $LVS"
 115     lvm lvscan $lvm_ignorelockingfailure 2>&1 | vinfo
 116     for LV in $LVS; do
 117         lvm lvchange --yes -K -ay $lvm_quirk_args $LV 2>&1 | vinfo
 118     done
 119 fi
 120
 121 if [ -z "$LVS" -o -n "$VGS" ]; then
 122     info "Scanning devices $lvmdevs for LVM volume groups $VGS"
 123     lvm vgscan $lvm_ignorelockingfailure 2>&1 | vinfo
 124     lvm vgchange -ay $lvm_quirk_args $VGS 2>&1 | vinfo
 125 fi
 126
 127 if [ "$lvmwritten" ]; then
 128     rm -f -- /etc/lvm/lvm.conf
 129 fi
 130 unset lvmwritten
 131
 132 udevadm settle
 133
 134 need_shutdown