mod-md.sh

   1 #!/bin/sh
   2 # geninitrd mod: mdadm
   3 USE_MD=${USE_MD:-yes}
   4
   5 # if we should init md (softraid) at boot
   6 have_md=no
   7
   8 # setup geninitrd module
   9 # @access       public
  10 setup_mod_md() {
  11         mdassemble=$(find_tool $initrd_dir/mdassemble /sbin/initrd-mdassemble)
  12         if [ ! -x "$mdassemble" ]; then
  13                 USE_MD=no
  14         fi
  15         mdadm=$(find_tool /sbin/mdadm $initrd_dir/mdadm /sbin/initrd-mdadm)
  16         if [ ! -x "$mdadm" ]; then
  17                 USE_MD=no
  18         fi
  19 }
  20
  21 # return true if mdadm is set on $devpath
  22 # @param        string $devpath device node to be examined
  23 # @access       public
  24 is_md() {
  25         local devpath="$1"
  26
  27         # mdadm disabled
  28         if ! is_yes "$USE_MD"; then
  29                 return 1
  30         fi
  31
  32         if [[ "$devpath" == /dev/md* ]]; then
  33                 return 0
  34         fi
  35
  36         return 1
  37 }
  38
  39 # find md modules for $devpath
  40 # @param        $devpath        device to be examined
  41 # @return       false if $devpath is not on md
  42 # @access       public
  43 find_modules_md() {
  44         local found raidlevel
  45
  46         if [ -f /etc/mdadm.conf ]; then
  47                 verbose "Finding RAID details using mdadm for rootdev=$1"
  48                 eval `($mdadm -v --examine --scan --config=/etc/mdadm.conf 2> /dev/null;$mdadm -v --detail --scan --config=/etc/mdadm.conf 2> /dev/null) | awk -v rootdev="$1" '
  49                 BEGIN {
  50                         found = "no";
  51                         dev_list = "";
  52                         raidlevel = ""
  53                         rootdev_new = rootdev
  54                         rootdev_alias = rootdev;
  55                         # alternative name: normalize from /dev/md/X to /dev/mdX
  56                         if (rootdev_alias ~ /\/dev\/md\/[0-9]+/) {
  57                                 gsub(/\/dev\/md\//,"/dev/md",rootdev_alias);
  58                         }
  59                         # alternative name: normalize from /dev/mdXpY to /dev/mdX
  60                         if (rootdev_alias ~/\/dev\/md[0-9]+p[0-9]+/) {
  61                                 gsub(/p[0-9]+/,"",rootdev_alias);
  62                         }
  63                 }
  64
  65                 /^ARRAY/ {
  66                         arr_device = $2
  67                         # normalize to /dev/mdX form
  68                         if (arr_device ~ /\/dev\/md\/[0-9]+/) {
  69                                 gsub(/\/dev\/md\//,"/dev/md",arr_device);
  70                         }
  71                         if ((arr_device == rootdev) || (arr_device == rootdev_alias)) {
  72                                 raidlevel=$3;
  73                                 rootdev_new=arr_device
  74                                 gsub(/level=/,NUL,raidlevel);
  75                                 if (raidlevel ~ /^raid([0-6]|10)/) {
  76                                         gsub(/raid/,NUL,raidlevel);
  77                                 };
  78                                 found="yes";
  79                                 getline x;
  80                                 if (x ~ /devices=/) {
  81                                         dev_list = x;
  82                                         gsub(".*devices=", NUL, dev_list);
  83                                         gsub(",", " ", dev_list);
  84                                 }
  85                         }
  86                 }
  87
  88                 END {
  89                         print "rootdev_new=" rootdev_new;
  90                         print "have_md=" found;
  91                         print "raidlevel=" raidlevel;
  92                         print "dev_list=\"" dev_list "\"";
  93                 }'`
  94         fi
  95
  96         if [ "$have_md" != "yes" -a -f /etc/raidtab ]; then
  97                 die "raidtools are not longer supported. Please migrate to mdadm setup!"
  98         fi
  99
 100         if is_yes "$have_md"; then
 101                 case "$raidlevel" in
 102                 [01]|10)
 103                         find_module "raid$raidlevel"
 104                         ;;
 105                 [456])
 106                         find_module "-raid$raidlevel"
 107                         find_module "-raid456"
 108                         ;;
 109                 linear)
 110                         find_module "linear"
 111                         ;;
 112                 *)
 113                         warn "raid level $number (in mdadm config) not recognized"
 114                         ;;
 115                 esac
 116         else
 117                 die "RAID devices not found for \"$1\", check your configuration!"
 118         fi
 119
 120         verbose "md: found rootdev=$1 on device $rootdev_new with devices list ${dev_list}"
 121
 122         rootdev_nr=$(( $rootdev_nr + 1 ))
 123         eval "rootdev${rootdev_nr}=\"$rootdev_new\""
 124         eval "dev_list${rootdev_nr}=\"${dev_list}\""
 125
 126         for device in $dev_list; do
 127                 find_modules_for_devpath $device
 128         done
 129 }
 130
 131
 132 # generate initrd fragment for md
 133 # @access       public
 134 initrd_gen_md() {
 135         if ! is_yes "$have_md"; then
 136                 return
 137         fi
 138         verbose "Setting up mdadm..."
 139
 140         inst_exec $mdassemble /bin/mdassemble
 141
 142         # LVM on RAID case
 143         local dev_list_extra ex_dev
 144         dev_list_extra=$(awk '/^DEVICE / { for (i=2; i<=NF; i++) { printf "%s ", $i; }; } ' /etc/mdadm.conf | xargs)
 145         new_dev_list_extra=""
 146         for ex_dev in $dev_list_extra; do
 147                 if [ "$ex_dev" = "partitions" ]; then
 148                         echo "DEVICE partitions" >> "$DESTDIR/etc/mdadm.conf"
 149                         # FIXME: find and copy partition devices from /proc/partitions
 150                         #        - best if done at runtime, now initrd gen time
 151                         continue
 152                 fi
 153                 echo "DEVICE $ex_dev" >> "$DESTDIR/etc/mdadm.conf"
 154                 new_dev_list_extra="$new_dev_list_extra $ex_dev"
 155         done
 156         dev_list_extra=$new_dev_list_extra
 157
 158         local cr_rootdev cr_dev_list do_md0=1 nr cr_dev_list_md f cr_md_conf
 159         for nr in `seq 1 $rootdev_nr`; do
 160                 eval cr_rootdev="\$rootdev${nr}"
 161                 eval cr_dev_list="\$dev_list${nr}"
 162                 verbose "Setting up array ($cr_rootdev = $cr_dev_list)"
 163
 164                 [ "$cr_rootdev" = "/dev/md0" ] && do_md0=0
 165
 166                 echo "DEVICE $cr_dev_list" >> "$DESTDIR/etc/mdadm.conf"
 167                 cr_dev_list_md="$(echo "$cr_dev_list" | xargs | awk ' { gsub(/ +/,",",$0); print $0; }')"
 168                 cr_md_conf=$($mdadm --detail --brief --config=/etc/mdadm.conf $cr_rootdev | awk ' { gsub(/spares=[0-9]+/, "", $0); print $0; }')
 169                 if [ -n "$cr_md_conf" ]; then
 170                         echo "$cr_md_conf" >> "$DESTDIR/etc/mdadm.conf"
 171                 else
 172                         echo "ARRAY $cr_rootdev devices=$cr_dev_list_md" >> "$DESTDIR/etc/mdadm.conf"
 173                 fi
 174
 175                 for f in $cr_dev_list $cr_rootdev $dev_list_extra; do
 176                         # mkdir in case of devfs name
 177                         inst_d $(dirname $f)
 178                         [ -e "$DESTDIR/$f" ] && continue
 179                         # this works fine with and without devfs
 180                         inst $f $f
 181                 done
 182         done
 183
 184         add_linuxrc <<-EOF
 185         mdassemble
 186
 187         if [ "$DEBUGINITRD" ]; then
 188                 [ -e /proc/mdstat ] && echo "/proc/mdstat contents:" && cat /proc/mdstat
 189         fi
 190         EOF
 191
 192         # needed to determine md-version
 193         if [ "$do_md0" -eq 1 ]; then
 194                 mknod -m 660 $DESTDIR/dev/md0 b 9 0
 195         fi
 196 }