#!/bin/ksh
# IBM_PROLOG_BEGIN_TAG 
# This is an automatically generated prolog. 
#  
#  
#  
# Licensed Materials - Property of IBM 
#  
# (C) COPYRIGHT International Business Machines Corp. 2004,2005 
# All Rights Reserved 
#  
# US Government Users Restricted Rights - Use, duplication or 
# disclosure restricted by GSA ADP Schedule Contract with IBM Corp. 
#  
# IBM_PROLOG_END_TAG 
# @(#)54 1.8 src/avs/fs/mmfs/ts/admin/mmdevdiscover.sh, mmfs, avs_rgpfs24, rgpfs240610b 8/8/05 19:09:02
##############################################################################
#
# This script is invoked by GPFS to discover the disk devices on the
# local machine that will subsequently be opened for NSD volume identifier
# mapping.  We open each of the devices listed and examine sector 2 for a
# volume identifier that correlates to a volume identifier recorded in our
# configuration database.  If a match is found then this machine has local
# access to the underlying NSD device and local I/O occurs through the local
# device interface.  This script will also invoke
#
#   /var/mmfs/etc/nsddevices
#
# if it is supplied by the user.  If the nsddevices script exits with
# a return code of zero, then no other disk discovery is performed.
# If nsddevices does not exist, or returns with a non-zero return
# code, then this script performs its normal disk discovery steps.
#
# The output from both this script and nsddevices is a number of lines
# with the following format:
#
#   deviceName deviceType
#
# where
#   deviceName is a device name ("hdisk1", "sda", etc.)
#   deviceType is a known disk types.
#
# Known disk types currently are:
#
#   powerdisk  - EMC power path disk
#   vpath      - IBM virtual path disk
#   dlmfdrv    - Hitachi dlm
#   hdisk      - AIX hard disk
#   lv         - AIX logical volume.  Historical usage only.
#                Not allowed as a new device to mmcrnsd.
#   generic    - Device having no unique failover or multipathing
#                characteristic (predominantly Linux devices).
#
# Example:
#
#   hdisk1  hdisk
#   hdisk2  hdisk
#
##############################################################################

# Include global declarations and service routines.
. /usr/lpp/mmfs/bin/mmglobfuncs

sourceFile="mmdevdiscover.sh"
[[ -n $DEBUG || -n $DEBUGmmdevdiscover ]] && set -x
$mmTRACE_ENTER "$*"

# Change this if you want stderr to go elsewhere.
STDERR=/dev/null


########################################################
# Invoke the nsddevices user exit, if it was activated.
# If the script exits with a zero return code then we
# use it exclusively and will not do anything more.
# If nsddevices does not exist, or if it returns with
# a non-zero return code, then we will perform normal
# GPFS disk discovery.
########################################################
if [[ -x $nsddevices ]]
then
  $nsddevices
  [[ $? -eq 0 ]] && cleanupAndExit 0
fi


##################################################
# Perform the normal GPFS disk discovery process.
##################################################
if [[ $osName = AIX ]]
then
  # Get the names of Virtual Shared Disks, if any.
  if [[ -x $lsvsd ]]
  then
    $lsvsd 2>$STDERR | $awk '{ if (NF > 0) print $1 " vsd" }'
  fi

  # Get all defined and available vpaths, hdisks, etc.
  LC_ALL=C $getlvodm -F 2>$STDERR |                   \
    $awk '                                            \
      /hdiskpower/  { print $1 " powerdisk" ; next }  \
      /dlmfdrv/     { print $1 " dlmfdrv"   ; next }  \
      /vpath/       { print $1 " vpath"     ; next }  \
      /hdisk/       { print $1 " hdisk"     ; next }  \
    '

  # Get all logical volume names.
  # LVs are supported in older file systems only.  Not allowed as a new device.
  LC_ALL=C $lsvg -o 2>$STDERR | LC_ALL=C $lsvg -i -l 2>$STDERR | \
    $awk '                                  \
      /LV NAME/ || /:/  { next }            \
                        { print $1 " lv" }  \
    '

elif [[ $osName = Linux ]]
then
  # Get the names of all disks, vpaths, etc.
  $awk '                                                                 \
    /emcpower/   { if (NF > 3 && $3 > 1) print $4 " powerdisk" ; next }  \
    /vpath/      { if (NF > 3 && $3 > 1) print $4 " vpath"     ; next }  \
    /[sh]d/      { if (NF > 3 && $3 > 1) print $4 " generic"   ; next }  \
  ' /proc/partitions 2>$STDERR

else
  print -u2  " Unknown operating system $osName "
  cleanupAndExit
fi

# Search for the disk type of "file" in the mmsdrfs file.
# Note:  This is used for testing during development only.
possiblefiles=$($awk -F: '                      \
  /':$SG_DISKS:'/ {                             \
    if ($'$NSD_SUBTYPE_Field' == "file") {      \
      { print $'$NSD_SUBTYPE_DISKNAME_Field' }  \
    }                                           \
  }                                             \
 ' $mmsdrfsFile)
for testfile in $possiblefiles
do
  [[ -f $testfile ]] && print -- "$testfile file"
done

cleanupAndExit 0