modules.d/95iscsi/module-setup.sh

   1 #!/bin/bash
   2
   3 # called by dracut
   4 check() {
   5     local _rootdev
   6     # If our prerequisites are not met, fail anyways.
   7     require_binaries iscsistart hostname iscsi-iname || return 1
   8
   9     # If hostonly was requested, fail the check if we are not actually
  10     # booting from root.
  11
  12     is_iscsi() {
  13         local _dev=$1
  14
  15         [[ -L "/sys/dev/block/$_dev" ]] || return
  16         cd "$(readlink -f "/sys/dev/block/$_dev")"
  17         until [[ -d sys || -d iscsi_session ]]; do
  18             cd ..
  19         done
  20         [[ -d iscsi_session ]]
  21     }
  22
  23     [[ $hostonly ]] || [[ $mount_needs ]] && {
  24         pushd . >/dev/null
  25         for_each_host_dev_and_slaves is_iscsi || return 255
  26         popd >/dev/null
  27     }
  28     return 0
  29 }
  30
  31 get_ibft_mod() {
  32     local ibft_mac=$1
  33     # Return the iSCSI offload module for a given MAC address
  34     iscsiadm -m iface | while read iface_name iface_desc ; do
  35         IFS=$','
  36         set -- $iface_desc
  37         if [ "$ibft_mac" = "$2" ] ; then
  38             echo $1
  39             return 0
  40         fi
  41         unset IFS
  42     done
  43 }
  44
  45 install_ibft() {
  46     # When iBFT / iscsi_boot is detected:
  47     # - Use 'ip=ibft' to set up iBFT network interface
  48     #   Note: bnx2i is using a different MAC address of iSCSI offloading
  49     #         so the 'ip=ibft' parameter must not be set
  50     # - specify firmware booting cmdline parameter
  51
  52     for d in /sys/firmware/* ; do
  53         if [ -d ${d}/ethernet0 ] ; then
  54             read ibft_mac < ${d}/ethernet0/mac
  55             ibft_mod=$(get_ibft_mod $ibft_mac)
  56         fi
  57         if [ -z "$ibft_mod" ] && [ -d ${d}/ethernet1 ] ; then
  58             read ibft_mac < ${d}/ethernet1/mac
  59             ibft_mod=$(get_ibft_mod $ibft_mac)
  60         fi
  61         if [ -d ${d}/initiator ] ; then
  62             if [ ${d##*/} = "ibft" ] && [ "$ibft_mod" != "bnx2i" ] ; then
  63                 echo -n "ip=ibft "
  64             fi
  65             echo -n "rd.iscsi.firmware=1"
  66         fi
  67     done
  68 }
  69
  70 # called by dracut
  71 depends() {
  72     echo network rootfs-block
  73 }
  74
  75 # called by dracut
  76 installkernel() {
  77     local _arch=$(uname -m)
  78
  79     instmods bnx2i qla4xxx cxgb3i cxgb4i be2iscsi
  80     hostonly="" instmods iscsi_tcp iscsi_ibft crc32c iscsi_boot_sysfs
  81     iscsi_module_filter() {
  82         local _funcs='iscsi_register_transport'
  83         # subfunctions inherit following FDs
  84         local _merge=8 _side2=9
  85         function bmf1() {
  86             local _f
  87             while read _f; do
  88                 case "$_f" in
  89                     *.ko)    [[ $(<         $_f) =~ $_funcs ]] && echo "$_f" ;;
  90                     *.ko.gz) [[ $(gzip -dc <$_f) =~ $_funcs ]] && echo "$_f" ;;
  91                     *.ko.xz) [[ $(xz -dc   <$_f) =~ $_funcs ]] && echo "$_f" ;;
  92                 esac
  93             done
  94             return 0
  95         }
  96
  97         function rotor() {
  98             local _f1 _f2
  99             while read _f1; do
 100                 echo "$_f1"
 101                 if read _f2; then
 102                     echo "$_f2" 1>&${_side2}
 103                 fi
 104             done | bmf1 1>&${_merge}
 105             return 0
 106         }
 107         # Use two parallel streams to filter alternating modules.
 108         set +x
 109         eval "( ( rotor ) ${_side2}>&1 | bmf1 ) ${_merge}>&1"
 110         [[ $debug ]] && set -x
 111         return 0
 112     }
 113
 114     { find_kernel_modules_by_path drivers/scsi; if [ "$_arch" = "s390" -o "$_arch" = "s390x" ]; then find_kernel_modules_by_path drivers/s390/scsi; fi;} \
 115     | iscsi_module_filter  |  instmods
 116 }
 117
 118 # called by dracut
 119 cmdline() {
 120     install_ibft
 121 }
 122
 123 # called by dracut
 124 install() {
 125     inst_multiple umount iscsistart hostname iscsi-iname
 126     inst_multiple -o iscsiuio
 127     inst_libdir_file 'libgcc_s.so*'
 128
 129     # Detect iBFT and perform mandatory steps
 130     if [[ $hostonly_cmdline == "yes" ]] ; then
 131         local _ibftconf=$(install_ibft)
 132         [[ $_ibftconf ]] && printf "%s\n" "$_ibftconf" >> "${initdir}/etc/cmdline.d/95iscsi.conf"
 133     fi
 134
 135     inst_hook cmdline 90 "$moddir/parse-iscsiroot.sh"
 136     inst_hook cleanup 90 "$moddir/cleanup-iscsi.sh"
 137     inst "$moddir/iscsiroot.sh" "/sbin/iscsiroot"
 138     if ! dracut_module_included "systemd"; then
 139         inst "$moddir/mount-lun.sh" "/bin/mount-lun.sh"
 140     fi
 141     dracut_need_initqueue
 142 }