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                 nbddev=*)
  13                         nbddev="${x#nbddev=}"
  14                         ;;
  15                 nbdroot=*)
  16                         nbdroot="${x#nbdroot=}"
  17                         ;;
  18                 root=/dev/nbd*)
  19                         nbddev="${x#root=}"
  20                         ;;
  21         esac
  22 done
  23
  24 # if nbd root is not requested exit early and silently
  25 if [ -z "$nbdroot" ] && [ -z "$nbddev" ]
  26 then
  27         exit 0
  28 fi
  29
  30 . /scripts/functions
  31
  32 log_begin_msg "Setting up nbd-client"
  33
  34 modprobe nbd
  35 wait_for_udev
  36 configure_networking
  37
  38 # Support setting stuff using DHCP by overloading 'option root-path'
  39 case "$nbdroot" in
  40         ''|dhcp)
  41                 nbdroot=$ROOTPATH
  42                 ;;
  43 esac
  44
  45 nbdrootdev="$nbddev"
  46 nbdbasedev="${nbddev#/dev/}"
  47
  48 case "$nbdroot" in
  49         *,*,*)
  50                 nbdsrv="${nbdroot%%,*}"
  51                 nbdpath="${nbdroot%,*}"
  52                 nbdpath="${nbdpath##*,}"
  53                 # root= parameter overrides three-option nbdroot= parameter
  54                 if [ -z "$nbdrootdev" ]
  55                 then
  56                         nbdbasedev="${nbdroot##*,}"
  57                         nbdrootdev=/dev/$nbdbasedev
  58                 fi
  59                 ;;
  60         *,*)
  61                 nbdsrv="${nbdroot%,*}"
  62                 nbdport="${nbdroot#*,}"
  63                 ;;
  64         \[*\]:/*)
  65                 # [ipv6]:/path
  66                 # Note: this is specifically written to be compatible with NFS
  67                 # URLs
  68                 nbdsrv=${nbdroot%\]*}
  69                 nbdsrv=${nbdsrv#\[}
  70                 nbdpath=${nbdroot#\[$nbdsrv\]}
  71                 nbdpath=${nbdpath#:}
  72                 ;;
  73         \[*\]*)
  74                 # [ipv6]:port/path
  75                 nbdsrv=${nbdroot%\]*}
  76                 nbdsrv=${nbdsrv#\[}
  77                 nbdportpath=${nbdroot#\[$nbdsrv\]}
  78                 nbdportpath=${nbdportpath#:}
  79                 nbdport=${nbdportpath%%/*}
  80                 nbdpath=${nbdportpath#$nbdport/}
  81                 ;;
  82         /*|*:/*)
  83                 # ipv4:/path
  84                 # Note: this is specifically written to be compatible with NFS
  85                 # URLs
  86                 nbdsrv=${nbdroot%%[:/]*}
  87                 nbdpath=${nbdroot#$nbdsrv}
  88                 nbdpath=${nbdpath#:}
  89                 ;;
  90         *)
  91                 # ipv4:port/path
  92                 nbdsrv=${nbdroot%%[:/]*}
  93                 nbdportpath=${nbdroot#$nbdsrv}
  94                 nbdportpath=${nbdportpath#:}
  95                 nbdport=${nbdportpath%%/*}
  96                 nbdpath=${nbdportpath#$nbdport/}
  97                 ;;
  98 esac
  99
 100 nbdrootdev=${nbdrootdev%p*}
 101 nbdbasedev=${nbdbasedev%p*}
 102 # If host is omitted, use ROOTSERVER from DHCP.
 103 case "$nbdsrv" in
 104         ''|dhcp)
 105                 nbdsrv=$ROOTSERVER
 106                 ;;
 107 esac
 108
 109 if [ -z "$nbdsrv" ] || [ -z "$nbdrootdev" ] || [ -z "$nbdpath" ]
 110 then
 111         log_failure_msg "Insufficient information to set up nbd, quitting (nbdroot=$nbdroot, host=$nbdsrv, name=$nbdpath, port=$nbdport, nbd-device=$nbdrootdev)"
 112         exit 0
 113 fi
 114
 115 # Support defining an alternate launch script with env variable NBDCLIENT.
 116 NBDCLIENT=${NBDCLIENT:-/sbin/nbd-client}
 117 $NBDCLIENT $nbdsrv -N $nbdpath $nbdport $nbdrootdev -swap -persist -systemd-mark
 118
 119 # This should be removed once the cfq scheduler no longer deadlocks nbd
 120 # devices
 121 if grep -q '\[cfq\]' /sys/block/$nbdbasedev/queue/scheduler
 122 then
 123         echo deadline > /sys/block/$nbdbasedev/queue/scheduler
 124 fi