debian/nbd-client.initrd

   1 #!/bin/sh
   2
   3 # We don't have any prerequisites
   4 case $1 in
   5 prereqs)
   6         exit 0
   7         ;;
   8 esac
   9
  10 for x in $(cat /proc/cmdline); do
  11         case $x in
  12                 nbdroot*)
  13                         nbdroot="${x}"
  14                         ;;
  15                 root=/dev/nbd*)
  16                         nbdrootdev="${x#root=}"
  17                         nbdbasedev="${x#root=/dev/}"
  18                         ;;
  19         esac
  20 done
  21
  22 # if nbd root is not requested exit early and silently
  23 if [ -z "${nbdroot}" ]; then
  24         exit 0
  25 fi
  26
  27 . /scripts/functions
  28
  29 log_begin_msg "Setting up nbd-client"
  30
  31 configure_networking
  32
  33 x="$nbdroot"
  34 # Support setting stuff using DHCP by overloading 'option root-path'
  35 case $x in
  36         nbdroot=dhcp)
  37                 x="$ROOTPATH"
  38                 ;;
  39 esac
  40
  41 case $x in
  42         nbdroot=*,*,*)
  43                 nbdroot="${x#nbdroot=}"
  44                 nbdsrv="${nbdroot%%,*}"
  45                 nbdport="${nbdroot%,*}"
  46                 nbdport="${nbdport##*,}"
  47                 # root= parameter overrides three-option nbdroot= parameter
  48                 if [ -z "$nbdrootdev" ]
  49                 then
  50                         nbdbasedev="${nbdroot##*,}"
  51                         nbdrootdev=/dev/$nbdbasedev
  52                 fi
  53                 ;;
  54         nbdroot=*,*)
  55                 nbdroot="${x#nbdroot=}"
  56                 nbdsrv="${nbdroot%,*}"
  57                 nbdport="${nbdroot#*,}"
  58                 ;;
  59 esac
  60
  61 nbdrootdev=${nbdrootdev%p*}
  62 nbdbasedev=${nbdbasedev%p*}
  63
  64 if [ -z "$nbdport" -o -z "$nbdrootdev" ]
  65 then
  66         log_failure_msg "Insufficient information to set up nbd, quitting (nbdsrv=$nbdsrv nbdport=$nbdport nbdroot=$nbdroot root=$nbdrootdev)"
  67         exit 0
  68 fi
  69
  70 nondigits=$(echo $nbdport | sed -e 's/[0-9]//g')
  71 if [ ! -z "$nondigits" ]
  72 then
  73         # non-numeric characters, assume a name rather than a port
  74         nbdport="-N $nbdport"
  75 fi
  76
  77 # Support setting the server's IP address by overloading 'option
  78 # root-server'. This is separate from the "ROOTPATH" grabbing above, in
  79 # that here we only specify the server's IP address through DHCP, but
  80 # expect everything else to be set through the kernel's command line.
  81 # Netbooting is a can of worms.
  82 if [ "$nbdsrv" = "dhcp" ]
  83 then
  84         nbdsrv=$ROOTSERVER
  85 fi
  86
  87 if [ -z "$nbdsrv" ]
  88 then
  89         log_failure_msg "Insufficient information to set up nbd, quitting (nbdsrv=$nbdsrv nbdport=$nbdport nbdroot=$nbdroot root=$nbdrootdev)"
  90         exit 0
  91 fi
  92
  93 /sbin/nbd-client $nbdsrv $nbdport $nbdrootdev -persist
  94 # This should be removed once the cfq scheduler no longer deadlocks nbd
  95 # devices
  96 if grep '\[cfq\]' /sys/block/$nbdbasedev/queue/scheduler >/dev/null
  97 then
  98         echo deadline > /sys/block/$nbdbasedev/queue/scheduler
  99 fi