mod-lvm.sh

   1 #!/bin/sh
   2 LVM_RCSID='$Revision$ $Date::                            $'
   3
   4 # geninitrd mod: LVM
   5 USE_LVM=${USE_LVM:-yes}
   6
   7 # if we should init LVM at boot
   8 have_lvm=no
   9
  10 # LVM volumes that are needed to activate
  11 # VG for root dev
  12 # @internal
  13 LVM_ROOTVG=""
  14
  15 # VG for suspend resume dev
  16 LVM_SUSPENDVG=""
  17
  18 LVM_VGVOLUMES=""
  19
  20 # LVM version. Autodetected if not set.
  21 # Values: 1|2
  22 LVMTOOLSVERSION=
  23
  24 # LVM devices that should not be included in vgscan on initrd.
  25 # @internal
  26 lvm_ignore_devices=''
  27
  28 # setup geninitrd module
  29 # @access       public
  30 setup_mod_lvm() {
  31         lvm=$(find_tool $initrd_dir/lvm /sbin/initrd-lvm)
  32
  33         if [ ! -x "$lvm" ]; then
  34                 USE_LVM=no
  35         fi
  36
  37         if is_yes "$USE_LVM" && [ -z "$LVMTOOLSVERSION" ]; then
  38                 LVMTOOLSVERSION=$(LC_ALL=C $lvm vgchange --version 2>/dev/null | awk '/LVM version:/{if ($3 >= 2) print "2"}')
  39                 if [ -z "$LVMTOOLSVERSION" ]; then
  40                         die "Can't determine LVM tools version (is /sys mounted?). Please set LVMTOOLSVERSION and rerun $PROGRAM."
  41                 fi
  42         fi
  43 }
  44
  45 # return true if node is lvm node
  46 # @param        string $node device node to be examined
  47 # @access       public
  48 is_lvm() {
  49         local node="$1"
  50
  51         # LVM not wanted
  52         if is_no "$USE_LVM"; then
  53                 return 1
  54         fi
  55
  56         if [ ! -e "$node" ]; then
  57                 die "check_lvm(): node $node doesn't exist!"
  58                 return 1
  59         fi
  60
  61         # block-major-58 is lvm1
  62         ls -lL "$node" 2> /dev/null | awk '{if (/^b/) { if ($5 == "58,") { exit 0; } else { exit 1; } } else { exit 1; }}'
  63         rc=$?
  64
  65         if [ $rc = 0 ]; then
  66                 # is lvm1
  67                 return 0
  68         fi
  69
  70         $lvm lvdisplay "$node" > /dev/null 2>&1
  71         rc=$?
  72         if [ $rc -gt 127 ]; then
  73                 # lvdisplay terminated by signal! most likely it segfaulted.
  74                 die "Unexpected exit from 'lvdisplay $node': $rc - are your lvm tools broken?"
  75         fi
  76
  77         return $rc
  78 }
  79
  80 # find modules for $devpath
  81 # @param        $devpath        device to be examined
  82 # @access       public
  83 find_modules_lvm() {
  84         local devpath="$1"
  85
  86         verbose "LVM: $devpath is LVM node"
  87
  88         local vg=$(find_lvm_vg "$devpath")
  89         verbose "LVM VG for $devpath: $vg"
  90         LVM_VGVOLUMES=$(echo $LVM_VGVOLUMES $vg | tr ' ' '\n' | sort -u)
  91
  92         local pv=$(find_lvm_pv "$vg")
  93         verbose "LVM PV for $vg: $pv"
  94         PVDEVICES=$(echo $PVDEVICES $pv | tr ' ' '\n' | sort -u)
  95
  96         if [ -n "$PVDEVICES" ]; then
  97                 for device in $PVDEVICES; do
  98                         find_modules_for_devpath $device
  99                 done
 100         else
 101                 die "I wasn't able to find PV. You can try to set PVDEVICES in /etc/sysconfig/geninitrd."
 102         fi
 103
 104         if [ "$LVMTOOLSVERSION" = "2" ]; then
 105                 find_module "-dm-mod"
 106         elif [ "$LVMTOOLSVERSION" = "1" ]; then
 107                 find_module "-lvm"
 108                 find_module "-lvm-mod"
 109         else
 110                 die "LVM version $LVMTOOLSVERSION is not supported."
 111         fi
 112
 113         verbose "LVM v$LVMTOOLSVERSION enabled"
 114         have_lvm=yes
 115 }
 116
 117
 118 # generate initrd fragment for lvm
 119 # @access       public
 120 initrd_gen_lvm() {
 121         if ! is_yes "$have_lvm"; then
 122                 return
 123         fi
 124
 125         verbose "Adding LVM support to initrd"
 126         inst_d /tmp /newroot
 127         inst_exec $lvm /bin/lvm.static
 128
 129         # always make /dev on tmpfs for LVM2
 130         if [ "$LVMTOOLSVERSION" = "2" ]; then
 131                 mount_dev
 132         fi
 133
 134         if ! is_yes "$dev_mounted"; then
 135                 inst_d /dev/mapper
 136                 mknod -m 600 $DESTDIR/dev/mapper/control c 10 63
 137                 for device in $PVDEVICES; do
 138                         # if LVM on RAID then device might be copied already in gen_md
 139                         [ -e "$DESTDIR/dev/$(basename $device)" ] && continue
 140                         inst $device /dev
 141                 done
 142         fi
 143
 144         mount_tmp
 145         mount_sys
 146         if [ "$LVMTOOLSVERSION" = "1" ]; then
 147                 add_linuxrc <<-EOF
 148                         lvm vgscan -T
 149                         for vg in $LVM_VGVOLUMES; do
 150                                 lvm vgchange -T -a y $vg
 151                         done
 152                 EOF
 153         else
 154                 cat <<-EOF > "$DESTDIR/etc/lvm.conf"
 155                 global {
 156                         locking_type = 0
 157                         locking_dir = "/tmp"
 158                 }
 159                 devices {
 160                         sysfs_scan=0
 161                 EOF
 162                 if is_yes "$have_md"; then
 163                         echo "  md_component_detection=1" >> "$DESTDIR/etc/lvm.conf"
 164                 fi
 165                 if is_yes "$have_dmraid" || is_yes "$have_multipath"; then
 166                         echo '  types = [ "device-mapper", 254 ]' >> "$DESTDIR/etc/lvm.conf"
 167                 fi
 168                 if [ "$lvm_ignore_devices" ]; then
 169                         # TODO: think of merging with lvm dumpconfig output
 170                         echo '  filter = [' >> "$DESTDIR/etc/lvm.conf"
 171                         local dev
 172                         for dev in $lvm_ignore_devices; do
 173                                 verbose "LVM v2: ignore device $dev"
 174                                 printf '  "r|^%s.*|",\n' $dev
 175                         done >> "$DESTDIR/etc/lvm.conf"
 176                         echo ']' >> "$DESTDIR/etc/lvm.conf"
 177                 fi
 178                 # XXX filter= must be on one line!
 179                 $lvm dumpconfig | awk '/filter=/' >> "$DESTDIR/etc/lvm.conf"
 180                 echo "}" >> "$DESTDIR/etc/lvm.conf"
 181
 182                 echo "cat /etc/lvm.conf > /tmp/lvm.conf" | add_linuxrc
 183
 184                 initrd_gen_devices
 185
 186                 add_linuxrc <<-EOF
 187                         ROOTDEV=$rootdev
 188                         LVM_ROOTVG="$LVM_VGVOLUMES"
 189                         LVM_SUSPENDVG="$LVM_SUSPENDVG"
 190                 EOF
 191
 192                 # need awk for "s/--/-/g" subst when parsing kernel root commandline
 193                 busybox_applet awk
 194                 add_linuxrc <<-'EOF'
 195                         # parse rootdev from kernel commandline if it begins with /
 196                         case "$ROOT" in
 197                                 /*)
 198
 199                                 # rewrite:
 200                                 # /dev/mapper/sys-rootfs -> /dev/sys/rootfs
 201                                 # /dev/mapper/blodnatt-blah--bleh -> /dev/blodnatt/blah-bleh
 202                                 # /dev/mapper/vg--meaw-root -> /dev/vg-meaw/root
 203                                 case "$ROOT" in
 204                                         /dev/mapper/*-*)
 205                                                 # change "--" to / (as "/" is impossible in LV name)
 206                                                 local dev=$(awk -vdev="${ROOT#/dev/mapper/}" 'BEGIN{gsub(/--/, "/", dev); print dev}')
 207                                                 local VG=$(awk -vdev="$dev" 'BEGIN{split(dev, v, "-"); gsub("/", "-", v[1]); print v[1]}')
 208                                                 local LV=$(awk -vdev="$dev" 'BEGIN{split(dev, v, "-"); gsub("/", "-", v[2]); print v[2]}')
 209                                                 ROOT=/dev/$VG/$LV
 210                                         ;;
 211                                 esac
 212
 213                                 if [ "$ROOT" != "$ROOTDEV" ]; then
 214                                         ROOTDEV=$ROOT
 215
 216                                         echo "LVM: Using 'root=$ROOTDEV' from kernel commandline"
 217                                         local tmp=${ROOTDEV#/dev/}
 218                                         if [ "$tmp" != "$ROOTDEV" ]; then
 219                                                 LVM_ROOTVG=${tmp%/*}
 220                                                 echo "LVM: Using Volume Group '$LVM_ROOTVG' for rootfs"
 221                                         fi
 222                                 fi
 223                                 ;;
 224                         esac
 225
 226                         # skip duplicate VG
 227                         if [ "$LVM_SUSPENDVG" = "$LVM_ROOTVG" ]; then
 228                                 LVM_VGVOLUMES="$LVM_ROOTVG"
 229                         else
 230                                 LVM_VGVOLUMES="$LVM_SUSPENDVG $LVM_ROOTVG"
 231                         fi
 232
 233                         # disable noise from LVM accessing devices that aren't ready.
 234                         read printk < /proc/sys/kernel/printk
 235                         if [ ! "$DEBUGINITRD" ]; then
 236                                 echo 0 > /proc/sys/kernel/printk
 237                         fi
 238
 239                         export LVM_SYSTEM_DIR=/tmp
 240
 241                         : 'Scanning for Volume Groups'
 242                         lvm.static vgscan --mknodes --ignorelockingfailure
 243
 244                         : 'Activating Volume Groups'
 245                         for vol in $LVM_VGVOLUMES; do
 246                                 lvm.static vgchange --ignorelockingfailure -a y $vol --noudevsync
 247                         done
 248
 249                         : 'Extra call to make device nodes for non lvm2-initrd (dynamic lvm2)'
 250                         lvm.static vgmknodes --ignorelockingfailure
 251
 252                         echo "$printk" > /proc/sys/kernel/printk
 253
 254                         # Find out major/minor
 255                         attrs="$(lvm.static lvdisplay --ignorelockingfailure -c $ROOTDEV)"
 256                         if [ "$attrs" ]; then
 257                                 majmin="${attrs#*$ROOTDEV*:*:*:*:*:*:*:*:*:*:*:*}"
 258                                 if [ "$majmin" != "$attrs" ]; then
 259                                         major="${majmin%:*}"
 260                                         minor="${majmin#*:}"
 261                                 fi
 262                         fi
 263
 264                         if [ "$major" -a "$minor" ]; then
 265                                 # Pass it to kernel
 266                                 echo $((256 * $major + $minor)) > /proc/sys/kernel/real-root-dev
 267                         fi
 268
 269                         debugshell
 270                         unset LVM_SYSTEM_DIR
 271                 EOF
 272         fi
 273 }
 274
 275
 276 # PRIVATE METHODS
 277
 278 # find PV names from given VG name
 279 # @param        string $vg Volume Group name
 280 # @access       private
 281 find_lvm_pv() {
 282         local vg="$1"
 283
 284         local pv=$($lvm vgs --noheadings -o pv_name  "$vg")
 285         echo $pv
 286 }
 287
 288 # find VG name from given devnode
 289 # @param        string $devnode device node to be examined
 290 # @access       private
 291 find_lvm_vg() {
 292         local devnode="$1"
 293
 294         local vg=$($lvm lvs --noheadings -o vg_name  "$devnode")
 295         echo $vg
 296 }