#!/bin/ksh
#*******************************************************************************
#
# NAME:		add_rdac
# SUMMARY:	%description%
# COMPONENT:	solsysd
# VERSION:	rm6_6
# UPDATE DATE:	%date_modified: Tue Sep 16 15:44:32 1997 %
# PROGRAMMER:	%created_by:    mgallagh %
# 
#		Copyright 1997 by Symbios Logic Inc.
#
# DESCRIPTION:
# add_rdac carries out the necessary steps to register newly-created LUNs with
# the RDAC driver, and to make names for the new LUN appear under /dev.
#
# NOTES:
#
# REFERENCE:
#
# CODING STANDARD WAIVERS:
#
#*******************************************************************************

#*******************************************************************************
# PROCEDURE:	MutexAcquire
# SUMMARY:	get exclusive ownership of mutex file
#
# DESCRIPTION:
# MutexAcquire will try repeatedly to acquire a "mutex file" - success means
# the thread has been admitted to a "critical region"
#
# SYNTAX:
# MutexAcquire <mutex file>
# <mutex file> - name of the mutex guarding the critical region
#
# NOTES:
# MutexAcquire and the program it calls, rm_mutex_acquire, rely on O_CREAT
# semantics
#
# RETURNS:
# Nothing

MutexAcquire()
{
	while true
	do
		$RM_HOME/bin/rm_mutex_acquire $1
		if [ $? = 0 ]
		then
			break;
		fi
		sleep 1
	done;
}

#*******************************************************************************
# PROCEDURE:	MutexRelease
# SUMMARY:	relenquish mutex file ownership
#
# DESCRIPTION:
# MutexRelease releases mutex file ownership, so another thread can enter the
# critical region
#
# SYNTAX:
# MutexRelease <mutex file>
# <mutex file> - name of the mutex guarding the critical region
#
# NOTES:
#
# RETURNS:
# Nothing

MutexRelease()
{
	/bin/rm $1;
}

#*******************************************************************************
# PROCEDURE:	add_rdac (main)
# SUMMARY:	Register a new LUN with the RDAC driver
#
# DESCRIPTION:
# add_rdac peforms the following steps:  (1) modify rdriver.conf to reflect
# the new LUN configuration, (2) inform the RDAC driver of the new LUN
# existence (via the "bind_rd" program), (3) register the new LUN with the OS
# (via the "drvconfig" program), and (4) create device names for the new LUNs
# (via the "symdisks" program).
#
# SYNTAX:
# add_rdac
#
# NOTES:
#
# RETURNS:
# 0 - success
# 1 - failure


# A D D _ R D A C   M A I N   P R O C E D U R E

PARMS=/etc/raid/rmparams
DEV_KEY=System_AltDevDirRoot
HOME_DIR_KEY=System_RmHomeDirectory
BOOT_HOME_KEY=System_RmBootHomeDirectory
RD_SUPPORT_KEY=Rdac_SupportDisabled.*=.*TRUE

RMDEVROOT=`grep -v "^#" $PARMS | grep $DEV_KEY | cut -d= -f2 | awk -F/ '{ ORS = "/"; for (i = NF; i > 1; --i) print $i; ORS = "\n"; print $1 }' | cut -d"/" -f3-32 |  awk -F/ '{ ORS = "/"; for (i = NF; i > 1; --i) print $i; ORS = "\n"; print $1 }'`

RM_HOME=`grep -v "^#" $PARMS | grep $HOME_DIR_KEY | cut -d= -f2`
RM_BOOT_HOME=`grep -v "^#" $PARMS | grep $BOOT_HOME_KEY | cut -d= -f2`
SYMCONF=$RM_BOOT_HOME/symconf
SYMDISKS=$RM_BOOT_HOME/symdisks

if grep -v "^#" $PARMS | grep "$RD_SUPPORT_KEY" >/dev/null 2>&1
then
	RDAC_DISABLED=TRUE
fi

if [ -x "/usr/ucb/logger" ]
then
	LOGGER=/usr/ucb/logger
elif [ -x "/usr/bin/logger" ]
then
	LOGGER=/usr/bin/logger
else
	LOGGER=/bin/echo
fi

if [ -z "$RDAC_DISABLED" ]	# (RDAC is enabled)
then

	#
	# modify rdriver.conf
	#

	MutexAcquire /tmp/mutex.add_rdac
	cp /kernel/drv/rdriver.conf /tmp/rdriver.conf.orig.$$
	$SYMCONF -i >/tmp/rdriver.conf.$$ 2>/dev/null
	SYMCONF_STAT=$?
	if [ \( $SYMCONF_STAT -eq 0 \) -a \( -s /tmp/rdriver.conf.$$ \) ]
	then
		cp /tmp/rdriver.conf.$$ /kernel/drv/rdriver.conf
	else
		cp /tmp/rdriver.conf.orig.$$ /kernel/drv/rdriver.conf
		$LOGGER -p user.err "$SYMCONF called by $0 failed"
		MutexRelease /tmp/mutex.add_rdac
		exit 1
	fi

	# make sure we don't foul up permissions on rdriver.conf

	chmod 644 /kernel/drv/rdriver.conf
	chown root /kernel/drv/rdriver.conf
	chgrp sys  /kernel/drv/rdriver.conf

	rm /tmp/rdriver.conf.$$ /tmp/rdriver.conf.orig.$$ 2>/dev/null
	MutexRelease /tmp/mutex.add_rdac
fi

$SYMDISKS -r / -d rdriver >/dev/null 2>&1

exit 0