mod-lvm.sh

   1 #!/bin/sh
   2 #
   3 # geninitrd mod: LVM
   4 USE_LVM=${USE_LVM:-yes}
   5
   6 # if we should init LVM at boot
   7 have_lvm=no
   8
   9 # LVM volumes that are needed to activate
  10 # VG for root dev
  11 # @internal
  12 ROOTVG=""
  13
  14 # VG for suspend resume dev
  15 SUSPENDVG=""
  16
  17 VGVOLUMES=""
  18
  19 # LVM version. Autodetected if not set.
  20 # Values: 1|2
  21 LVMTOOLSVERSION=
  22
  23 # LVM devices that should not be included in vgscan on initrd.
  24 # @internal
  25 lvm_ignore_devices=''
  26
  27 # setup geninitrd module
  28 # @access       public
  29 setup_mod_lvm() {
  30         lvm=$(find_tool $initrd_dir/lvm /sbin/initrd-lvm)
  31
  32         if [ ! -x "$lvm" ]; then
  33                 USE_LVM=no
  34         fi
  35
  36         if is_yes "$USE_LVM" && [ -z "$LVMTOOLSVERSION" ]; then
  37                 LVMTOOLSVERSION=$(LC_ALL=C $lvm vgchange --version 2>/dev/null | awk '/LVM version:/{if ($3 >= 2) print "2"}')
  38                 if [ -z "$LVMTOOLSVERSION" ]; then
  39                         die "Can't determine LVM tools version. Please set LVMTOOLSVERSION and rerun $PROGRAM."
  40                 fi
  41         fi
  42 }
  43
  44 # return true if node is lvm node
  45 # @param        string $node device node to be examined
  46 # @access       public
  47 is_lvm() {
  48         local node="$1"
  49
  50         # LVM not wanted
  51         if is_no "$USE_LVM"; then
  52                 return 1
  53         fi
  54
  55         if [ ! -e "$node" ]; then
  56                 die "check_lvm(): node $node doesn't exist!"
  57                 return 1
  58         fi
  59
  60         # block-major-58 is lvm1
  61         ls -lL "$node" 2> /dev/null | awk '{if (/^b/) { if ($5 == "58,") { exit 0; } else { exit 1; } } else { exit 1; }}'
  62         rc=$?
  63
  64         if [ $rc = 0 ]; then
  65                 # is lvm1
  66                 return 0
  67         fi
  68
  69         $lvm lvdisplay "$node" > /dev/null 2>&1
  70         rc=$?
  71         if [ $rc -gt 127 ]; then
  72                 # lvdisplay terminated by signal! most likely it segfaulted.
  73                 die "Unexpected exit from 'lvdisplay $node': $rc - are your lvm tools broken?"
  74         fi
  75
  76         return $rc
  77 }
  78
  79 # find modules for $devpath
  80 # @param        $devpath        device to be examined
  81 # @access       public
  82 find_modules_lvm() {
  83         local devpath="$1"
  84
  85         debug "LVM: $devpath is LVM node"
  86
  87         local vg=$(find_lvm_vg "$devpath")
  88         debug "LVM VG for $devpath: $vg"
  89         VGVOLUMES=$(echo $VGVOLUMES $vg | tr ' ' '\n' | sort -u)
  90
  91         local pv=$(find_lvm_pv "$vg")
  92         debug "LVM PV for $vg: $pv"
  93         PVDEVICES=$(echo $PVDEVICES $pv | tr ' ' '\n' | sort -u)
  94
  95         if [ -n "$PVDEVICES" ]; then
  96                 for device in $PVDEVICES; do
  97                         find_modules_for_devpath $device
  98                 done
  99         else
 100                 die "I wasn't able to find PV. You can try to set PVDEVICES in /etc/sysconfig/geninitrd."
 101         fi
 102
 103         if [ "$LVMTOOLSVERSION" = "2" ]; then
 104                 find_module "-dm-mod"
 105         elif [ "$LVMTOOLSVERSION" = "1" ]; then
 106                 find_module "-lvm"
 107                 find_module "-lvm-mod"
 108         else
 109                 die "LVM version $LVMTOOLSVERSION is not supported."
 110         fi
 111
 112         debug "LVM v$LVMTOOLSVERSION enabled"
 113         have_lvm=yes
 114 }
 115
 116
 117 # generate initrd fragment for lvm
 118 # @access       public
 119 initrd_gen_lvm() {
 120         debug "Adding LVM support to initrd"
 121         inst_d /tmp /newroot
 122         inst_exec $lvm /bin/lvm.static
 123
 124         # always make /dev on tmpfs for LVM2
 125         if [ "$LVMTOOLSVERSION" = "2" ]; then
 126                 mount_dev
 127         fi
 128
 129         inst_d /dev
 130         mknod $DESTDIR/dev/urandom c 1 9
 131
 132         if ! is_yes "$dev_mounted"; then
 133                 inst_d /dev/mapper
 134                 mknod $DESTDIR/dev/mapper/control c 10 63
 135                 for device in $PVDEVICES; do
 136                         # if LVM on RAID then device might be copied already in gen_md
 137                         [ -e "$DESTDIR/dev/$(basename $device)" ] && continue
 138                         inst $device /dev
 139                 done
 140         fi
 141
 142         mount_tmp
 143         mount_sys
 144         if [ "$LVMTOOLSVERSION" = "1" ]; then
 145                 add_linuxrc <<-EOF
 146                         lvm vgscan -T
 147                         for vg in $VGVOLUMES; do
 148                                 lvm vgchange -T -a y $vg
 149                         done
 150                 EOF
 151         else
 152                 echo "cat /etc/lvm.conf > /tmp/lvm.conf" | add_linuxrc
 153                 echo "global {" > "$DESTDIR/etc/lvm.conf"
 154                 echo "  locking_type = 0" >> "$DESTDIR/etc/lvm.conf"
 155                 echo "  locking_dir = \"/tmp\"" >> "$DESTDIR/etc/lvm.conf"
 156                 echo "}" >> "$DESTDIR/etc/lvm.conf"
 157                 echo "devices {" >> "$DESTDIR/etc/lvm.conf"
 158                 echo "  sysfs_scan=0" >> "$DESTDIR/etc/lvm.conf"
 159                 if is_yes "$have_md"; then
 160                         echo "  md_component_detection = 1" >> "$DESTDIR/etc/lvm.conf"
 161                 fi
 162                 if is_yes "$have_dmraid" || is_yes "$have_multipath"; then
 163                         echo '  types = [ "device-mapper", 254 ]' >> "$DESTDIR/etc/lvm.conf"
 164                 fi
 165                 if [ "$lvm_ignore_devices" ]; then
 166                         # TODO: think of merging with lvm dumpconfig output
 167                         echo '  filter = [' >> "$DESTDIR/etc/lvm.conf"
 168                         local dev
 169                         for dev in $lvm_ignore_devices; do
 170                                 debug "LVM v2: ignore device $dev"
 171                                 printf '  "r|^%s.*|",\n' $dev
 172                         done >> "$DESTDIR/etc/lvm.conf"
 173                         echo ']' >> "$DESTDIR/etc/lvm.conf"
 174                 fi
 175                 # XXX filter= must be on one line!
 176                 $lvm dumpconfig | awk '/filter=/' >> "$DESTDIR/etc/lvm.conf"
 177                 echo "}" >> "$DESTDIR/etc/lvm.conf"
 178
 179                 initrd_gen_devices
 180
 181                 add_linuxrc <<-EOF
 182                         export ROOTDEV=$rootdev
 183                         export ROOTVG="$VGVOLUMES"
 184                         export SUSPENDVG=$SUSPENDVG
 185                 EOF
 186                 add_linuxrc <<-'EOF'
 187                         # parse rootdev from kernel commandline if it begins with /
 188                         case "$ROOT" in
 189                                 /*)
 190                                 if [ "$ROOT" != "$ROOTDEV" ]; then
 191                                         ROOTDEV=$ROOT
 192                                         echo "LVM: Using 'root=$ROOTDEV' from kernel commandline"
 193                                         local tmp=${ROOTDEV#/dev/}
 194                                         if [ "$tmp" != "$ROOTDEV" ]; then
 195                                                 ROOTVG=${tmp%/*}
 196                                                 echo "LVM: Using Volume Group '$ROOTVG' for rootfs"
 197                                         fi
 198                                 fi
 199                                 ;;
 200                         esac
 201
 202                         # skip duplicate VG
 203                         if [ "$SUSPENDVG" = "$ROOTVG" ]; then
 204                                 export VGVOLUMES="$ROOTVG"
 205                         else
 206                                 export VGVOLUMES="$SUSPENDVG $ROOTVG"
 207                         fi
 208
 209                         # disable noise from LVM accessing devices that aren't ready.
 210                         read printk < /proc/sys/kernel/printk
 211                         if [ ! "$DEBUGINITRD" ]; then
 212                                 echo 0 > /proc/sys/kernel/printk
 213                         fi
 214
 215                         export LVM_SYSTEM_DIR=/tmp
 216                         : 'Scanning for Volume Groups'
 217                         lvm.static vgscan --mknodes --ignorelockingfailure 2>/dev/null
 218
 219                         : 'Activating Volume Groups'
 220                         for vol in $VGVOLUMES; do
 221                                 lvm.static vgchange --ignorelockingfailure -a y $vol 2>/dev/null
 222                         done
 223
 224                         echo "$printk" > /proc/sys/kernel/printk
 225
 226                         # Find out major/minor
 227                         attrs="$(lvm.static lvdisplay --ignorelockingfailure -c $ROOTDEV 2>/dev/null)"
 228                         if [ "$attrs" ]; then
 229                                 majmin="${attrs#*$ROOTDEV*:*:*:*:*:*:*:*:*:*:*:*}"
 230                                 if [ "$majmin" != "$attrs" ]; then
 231                                         major="${majmin%:*}"
 232                                         minor="${majmin#*:}"
 233                                 fi
 234                         fi
 235
 236                         if [ "$major" -a "$minor" ]; then
 237                                 # Pass it to kernel
 238                                 echo $((256 * $major + $minor)) > /proc/sys/kernel/real-root-dev
 239                         else
 240                                 echo 2>&1 "Error figuring out real root device for $ROOTDEV!"
 241                                 echo 2>&1 "System will not most likely boot up! So dropping you to a shell!"
 242                                 echo 2>&1 ""
 243                                 sh
 244                         fi
 245                 EOF
 246         fi
 247 }
 248
 249
 250 # PRIVATE METHODS
 251
 252 # find PV names from given VG name
 253 # @param        string $vg Volume Group name
 254 # @access       private
 255 find_lvm_pv() {
 256         local vg="$1"
 257
 258         local pv=$($lvm vgs --noheadings -o pv_name  "$vg")
 259         echo $pv
 260 }
 261
 262 # find VG name from given devnode
 263 # @param        string $devnode device node to be examined
 264 # @access       private
 265 find_lvm_vg() {
 266         local devnode="$1"
 267
 268         local vg=$($lvm lvs --noheadings -o vg_name  "$devnode")
 269         echo $vg
 270 }