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#!/bin/sh
#
# Author: Francis Wiran <Francis.Wiran@hp.com>
#
# Script to create device nodes for SMART Array controllers, idea from
# mkdev.cciss found in Documentation. The argument syntax is different,
# hence, the name change.
#
# Usage:
#       mkdev_dyn.cciss [ctlr num] [major num] [num log vol] [num partitions]
#
# With no arguments, the script will check to see if there are any cciss
# nodes already created in the /dev directory. If so, then it will assume
# that the nodes for the first 8 controllers are already created by
# /etc/makedev.d, which is likely. If not, then the script will create 
# them, using the major numbers reserved for cciss controllers (104 thru 111).
#
# After that, it will start creating nodes for the controllers which major
# numbers are dynamically allocated by the kernel. It will check 
# /proc/devices for any cciss controllers with major numbers other than
# 104 thru 111 and creates the nodes.
#
# Note that it is a good idea to run rmdev_dyn.cciss script if you remove
# those controllers (the ones which major numbers were dynamically allocated)
# This will unclutter /dev, as well as preventing possible problems due to 
# referenced devices and major numbers no longer available or taken by
# other non-cciss drivers.
#
# With no arguments, the script assumes 16 logical volumes per controller
# and 16 partitions per volume; 
#
# Passing arguments:
# If you know that one of your controllers, say cciss8, has been dynamically 
# assigned major number 254, and were planning on no more than 2 logical 
# volumes, using a maximum of 4 partitions per volume, you could do:
#
# mkdev_dyn.cciss 8 254 2 4
#
# Of course, this has no real benefit over "mkdev_dyn.cciss 8 254" except 
# that it doesn't create as many device nodes in /dev/cciss.
#

# Inputs
NR_CTLR=${1-8}
NR_MAJOR=${2-254}
NR_VOL=${3-16}
NR_PART=${4-16}

echo_usage()
{
        echo "Usage: mkdev_dyn.cciss [ctlr num] [maj] [volumes] [partitions]"
        echo "The script assumes that ctlr 0 thru 7 is statically created"
        echo "Therefore, if you want to pass arguments make sure that"
        echo "ctlr num is equal or greater than 8, and the major number"
        echo "is not one that's statically assigned for cciss controller."
        echo "Check the correct major number in /proc/devices"

        # Hmm... we don't support volumes and partitions greater than 16
        # either.
}

echo_create()
{
        echo "created /dev/cciss/c${1}* nodes using major number ${2}"
}


# Function: do_mknod()
#           Creates devices nodes under /dev/cciss
# Inputs: $1 - ctlr number
#         $2 - major number
#         $3 - number of devices on controller
#         $4 - number of partitions per device
do_mknod()
{
        D=0;
        while [ $D -lt $3 ]; do
                P=0;
                while [ $P -lt $4 ]; do
                        MIN=`expr $D \* 16 + $P`;
                        if [ $P -eq 0 ]; then
                                mknod /dev/cciss/c${1}d${D} b $2 $MIN
                        else
                                mknod /dev/cciss/c${1}d${D}p${P} b $2 $MIN
                        fi
                        P=`expr $P + 1`;
                done
                D=`expr $D + 1`;
        done
}

# Function: do_dyn
#           Search and create cciss nodes for the controllers which
#           major numbers are allocated dynamically by the kernel
#           instead of using kernel.org 's value of 104 to 111.
#
# Input: $1 - ctlr num - will create nodes /dev/cciss/c${1}
#        $2 - major num - the major number to assign to the nodes
#        $3 - volumes - max number of volumes per controller
#        $4 - partitions - max number of partitions per volume
#
# Note: Without input, this function will start creating nodes
#       for controller c8 and above, making assumption that 
#       c0 thru c7 are already made, and the name c8 and above 
#       are not already taken.
do_dyn()
{
        if [ $# -eq 0 ]; then
                C=0;
                for MAJ in `cat /proc/devices |\
                        grep cciss |\
                        awk '/cciss[0-9]$/ { sub("cciss", "cciss0") }; {print}' |\
                        sort -k 2,2 |\
                        awk '{print $1-i}'`;
                do
                        if [ `ls -l /dev/cciss/c* |\
                                awk '{print $5-i}' |\
                                uniq |\
                                grep $MAJ |\
                                wc -l` -gt 0 ]; then
                                :
                        else
                                do_mknod $C $MAJ $NR_VOL $NR_PART;
                                echo_create $C $MAJ;
                        fi
                        C=`expr $C + 1`;
                done
        else
                do_mknod $1 $2 $3 $4;
                echo_create $1 $2;
        fi
        
        exit
}

# Start here

# Check the input values
if [ $NR_CTLR -lt 8 ]; then
        echo_usage;
        exit
fi

if [ $NR_CTLR -ge 8 ]; then
        if [ \( $NR_MAJOR -ge 104 \) -a \( $NR_MAJOR -le 111 \) ]; then
                echo_usage;
                exit
        fi
fi

if [ ! -d /dev/cciss ]; then
        mkdir -p /dev/cciss
fi

# Assume that if c0d0p1 node already exist, then all nodes from c0d0p1
# to c7d15p15 have been created for us.
if [ ! -b /dev/cciss/c0d0p1 ]; then
        C=0; 
        while [ $C -lt 8 ]; do
                MAJ=`expr $C + 104`;
                do_mknod $C $MAJ $NR_VOL $NR_PART;
                echo_create $C $MAJ;
                C=`expr $C + 1`;
        done
fi

if [ $# -gt 0 ]; then
        do_dyn $NR_CTLR $NR_MAJOR $NR_VOL $NR_PART;
else
        do_dyn;
fi