# /lib/rcscripts/addons/raid-start.sh:  Setup raid volumes at boot
# Copyright 1999-2005 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: /var/cvsroot/gentoo-x86/sys-fs/mdadm/files/raid-start.sh,v 1.4 2005/06/10 02:09:28 vapier Exp $

[[ -f /proc/mdstat ]] || exit 0

# MAJOR for md (non-partitioned) is normally static, 9.
# MAJOR for mdp (partitioned) is normally dynamic, but often 254.
# Hard define md for backward compatibility.  Comment hard define of mdp.
MAJOR_MD=9
#MAJOR_MDP=254

# If the majors are commented above, this should define them (/proc must be mounted)
[[ -z ${MAJOR_MD} ]] && MAJOR_MD=$(awk '$2 == "md" { print $1 }' /proc/devices)
[[ -z ${MAJOR_MDP} ]] && MAJOR_MDP=$(awk '$2 == "mdp" { print $1 }' /proc/devices)

# Try to make sure the devices exist before we use them.
create_devs() {
	local node devdir devfile minor major partnum partnode partnodes

	# This scans in the list of mdp nodes from fstab, to be used in the loop below.
	partnodes=$(awk '/^\/dev\/([^ ]*\/)?md_d/ { print $1 }' /etc/fstab)

	for node in $@ ; do
		# Prefix /dev/ if necessary.
		[[ ${node} != /dev/* ]] && node=/dev/${node}

		# Split out devdir and devfile, create devdir if necessary.
		devdir=${node%/*}
		devfile=${node##*/}
		[[ ! -d ${devdir} ]] && mkdir -p "${devdir}"

		# Setup major, minor.
		if [[ ${devfile#md_d} != ${devfile} ]]; then
			major=${MAJOR_MDP}
			minor=${devfile##*md_d}
			# Due to partition minors, mdp minors are 64-spaced.
			let minor=minor*64
		else
			major=${MAJOR_MD}
			minor=${devfile##*md}
		fi

		# Create the node, if necessary.
		[[ ! -e ${node} ]] && mknod "${node}" b ${major} ${minor} &> /dev/null

		# For mdp, we may need to create partition nodes too.
		if [[ ${major} -eq ${MAJOR_MDP} ]]; then
			# Loop thru partnodes (scanned in from fstab outside the loop).
			for partnode in $partnodes; do
				# Split out the partfile.
				partfile=${partnode##*/}
				
				# If partition on mdp devfile being processed...
				if [[ ${partfile%p*} = ${devfile} ]]; then
					# ... split out the partnum, add to it the mdp minor, and...
					partnum=${partfile##md_d*p}
					let partnum=partnum+minor

					# ... create the partition devnode, if necessary.
					[[ ! -e ${partnode} ]] && mknod "${partnode}" b ${major} ${partnum}
				fi
			done
		fi
	done
}

# Start software raid with raidtools (old school)
if [[ -x /sbin/raidstart && -f /etc/raidtab ]] ; then
	devs=$(awk '/^[[:space:]]*raiddev/ { print $2 }' /etc/raidtab)
	if [[ -n ${devs} ]] ; then
		create_devs ${devs}
		ebegin "Starting up RAID devices (raidtools)"
		output=$(raidstart -aq 2>&1)
		ret=$?
		[[ ${ret} -ne 0 ]] && echo "${output}"
		eend ${ret}
	fi
fi

# Start software raid with mdadm (new school)
if [[ -x /sbin/mdadm && -f /etc/mdadm.conf ]] ; then
	devs=$(awk '/^[[:space:]]*ARRAY/ { print $2 }' /etc/mdadm.conf)
	if [[ -n ${devs} ]] ; then
		create_devs ${devs}
		ebegin "Starting up RAID devices (mdadm)"
		output=$(mdadm -As 2>&1)
		ret=$?
		[[ ${ret} -ne 0 ]] && echo "${output}"
		eend ${ret}
	fi
fi

# vim:ts=4