[projects/geninitrd.git] / mod-multipath.sh

#!/bin/sh
#
# geninitrd mod: dm-multipath
USE_MULTIPATH=${USE_MULTIPATH:-yes}

# if we should init dm-multipath at boot
have_multipath=no

# dm-multipath wwid which is used for rootfs
MPATH_WWID=

# setup geninitrd module
# @access	public
setup_mod_multipath() {
	if [ ! -x /sbin/multipath ]; then
		USE_MULTIPATH=no
	fi
}

# return true if node is multipath controlled
# @param	string $node device node to be examined
# @access	public
is_multipath() {
	local devpath="$1"

	# multipath disabled
	if is_no "$USE_MULTIPATH"; then
		return 1
	fi

	# multipath nodes are under device mapper
	if [[ "$devpath" != /dev/mapper/* ]]; then
		return 1
	fi

	DM_NAME=
	eval $(dm_export "$devpath")
	if [ -z "$DM_NAME" ]; then
		die "Couldn't extract DM_NAME from $devpath"
	fi

	local MPATH_WWID=${DM_UUID##*-}

	# just check if it is valid.
	local info=$(multipath -l $MPATH_WWID)
	if [ -z "$info" ]; then
		return 1
	fi

	return 0
}

# find modules for $devpath
# @param	$devpath	device to be examined
# @access	public
# find dm-multipath modules for $devpath
# returns false if $devpath is not dm-multipath
find_modules_multipath() {
	local devpath="$1"

	DM_NAME=
	eval $(dm_export "$devpath")
	if [ -z "$DM_NAME" ]; then
		die "Couldn't extract DM_NAME from $devpath"
	fi

	# Partition:
	#  DM_NAME=LUN-28p1
	#  DM_UUID=part1-mpath-36006016002c11800a0aa05fbfae0db11
	# Disk:
	#  DM_NAME=LUN-28
	#  DM_UUID=mpath-36006016002c11800a0aa05fbfae0db11
	MPATH_WWID=${DM_UUID##*-}

	local info=$(multipath -l $MPATH_WWID)
	if [ -z "$info" ]; then
		return 1
	fi

	debug "Finding modules for dm-multipath (WWID=$MPATH_WWID)"
	have_multipath=yes

	local p list
	list=$(mp_parse_devs "$info")
	for p in $list; do
		find_modules_for_devpath $p
		lvm_ignore_devices="$lvm_ignore_devices $p"
	done

	# TODO: handle newer multipath-tools:
	# size=7.0G features='0' hwhandler='0' wp=rw
	list=$(echo "$info" | awk '/hwhandler=1/{sub(/.*hwhandler=1 /, ""); sub(/\]$/, ""); print}')
	for p in $list; do
		find_module "dm-$p"
	done

	list=$(mp_parse_policy "$info")
	for p in $list; do
		find_module "dm-$p"
	done

	find_module "dm-mod"
	return 0
}

# generate initrd fragment
# @access	public
initrd_gen_multipath() {
	inst_d /sbin /lib/udev /etc/multipath
	inst_exec /sbin/kpartx /sbin
	inst_exec /sbin/multipath /sbin

	# for udev callouts
	local scsi_id=$(find_tool /lib/udev/scsi_id /sbin/scsi_id)
	inst_exec $scsi_id /lib/udev

	if [ -d /lib/multipath ]; then
		inst_d /lib/multipath
		inst_exec /lib/multipath/* /lib/multipath
	else
		inst_exec /sbin/mpath* /sbin
	fi

	egrep -v '^([ 	]*$|#)' /etc/multipath.conf > $DESTDIR/etc/multipath.conf

	if [ -f /etc/multipath/bindings ]; then
		egrep -v '^([ 	]*$|#)' /etc/multipath/bindings > $DESTDIR/etc/multipath/bindings
	else
		touch $DESTDIR/etc/multipath/bindings
	fi

	mount_dev
	initrd_gen_devices

	mount_sys
	echo "export MPATH_WWID=$MPATH_WWID" | add_linuxrc
	add_linuxrc <<-'EOF'
		# parse mpath_wwid= from kernel commandline
		for arg in $CMDLINE; do
			if [ "${arg##mpath_wwid=}" != "${arg}" ]; then
				MPATH_WWID=${arg##mpath_wwid=}
				if [ "$MPATH_WWID" = "*" ]; then
					# '*' would mean activate all WWID-s
					MPATH_WWID=
					echo "multipath: Activating all WWID-s"
				else
					echo "multipath: Activating WWID=$WWID"
				fi
			fi
		done

		debugshell
		/sbin/multipath -v 0 $MPATH_WWID

		for a in /dev/mapper/*; do
			[ $a = /dev/mapper/control ] && continue
			/sbin/kpartx -a -p p $a
		done
		debugshell
	EOF
}


# PRIVATE METHODS
# export info from dmsetup
# param can be:
# - MAJOR:MINOR
# - /dev/dm-MINOR
# - /dev/mapper/DM_NAME
dm_export() {
	local arg="$1"

	case "$arg" in
	*:*)
		local maj=${arg%:*} min=${arg#*:}
		dmsetup -j $maj -m $min export
		;;
	/dev/dm-*)
		local min=${arg#*dm-}
		local maj=$(awk '$2 == "device-mapper" {print $1}' /proc/devices)
		dm_export $maj:$min
		;;
	/dev/mapper/*)
		local dm_name=${arg#/dev/mapper/}
		dmsetup export $dm_name
		;;
	*)
		die "dm_export: unexpected $arg"
		;;
	esac
}

# parse blockdevices behind multipath device
# takes 'multipath -l' output as input
mp_parse_devs() {
	local info="$1"

	# parse "0:0:1:0 sdf" -> /dev/sdf
	#
	# multipath-tools-0.4.8-0.12.amd64
	# LUN-02 (36006016002c11800ce520d27c6ebda11) dm-0 DGC     ,RAID 10
	# [size=12G][features=1 queue_if_no_path][hwhandler=1 emc]
	# \_ round-robin 0 [prio=0][active]
	#  \_ 0:0:0:0 sda 8:0   [active][undef]
	# \_ round-robin 0 [prio=0][enabled]
	#  \_ 0:0:1:0 sdf 8:80  [active][undef]
	#
	# multipath-tools-0.4.8-9.x86_64
	# LUN-14 (36006016002c118006f4f8bccc7fada11) dm-3 ,
	# size=7.0G features='0' hwhandler='0' wp=rw
	# |-+- policy='round-robin 0' prio=-1 status=enabled
	# | `- #:#:#:# sde 8:64 failed undef running
	# `-+- policy='round-robin 0' prio=-1 status=active
	#   `- #:#:#:# sdb 8:16 active undef running

	echo "$info" | awk '{
		if (match($0, /[#0-9]+:[#0-9]+:[#0-9]+:[#0-9]+ [^ ]+ [0-9]+:[0-9]/)) {
			# take whole matched part into "l" variable
			l = substr($0, RSTART, RLENGTH);
			split(l, a, " ");
			printf("/dev/%s\n", a[2])
		}
	}'
}

# parse policy output for each device
# takes 'multipath -l' output as input
mp_parse_policy() {
	local info="$1"

	# multipath-tools-0.4.8-0.12.amd64
	# LUN-02 (36006016002c11800ce520d27c6ebda11) dm-0 DGC     ,RAID 10
	# [size=12G][features=1 queue_if_no_path][hwhandler=1 emc]
	# \_ round-robin 0 [prio=0][active]
	#  \_ 0:0:0:0 sda 8:0   [active][undef]
	# \_ round-robin 0 [prio=0][enabled]
	#  \_ 0:0:1:0 sdf 8:80  [active][undef]
	#
	# multipath-tools-0.4.8-9.x86_64
	# LUN-14 (36006016002c118006f4f8bccc7fada11) dm-3 ,
	# size=7.0G features='0' hwhandler='0' wp=rw
	# |-+- policy='round-robin 0' prio=-1 status=enabled
	# | `- #:#:#:# sde 8:64 failed undef running
	# `-+- policy='round-robin 0' prio=-1 status=active
	#   `- #:#:#:# sdb 8:16 active undef running

	echo "$info" | awk '
		# multipath-tools-0.4.8-0.12.amd64
		/\[prio=/{
			print $2
		}
		# multipath-tools-0.4.8-9.x86_64
		/policy=/{
			if (match($0, /policy=[^ ]+/)) {
				# take whole matched part into "l" variable
				l = substr($0, RSTART, RLENGTH);
				# remove policy= and single quote,
				# which we can not use in this awk inline script, therefore the %c hack
				sub(sprintf("^policy=%c?", 39), "", l);
				print l
			}
		}
	' | sort -u
}
Commit	Line	Data
c3b54060 ER	1	#!/bin/sh
	2	#
	3	# geninitrd mod: dm-multipath
6e49b0b1	4	USE_MULTIPATH=${USE_MULTIPATH:-yes}
c3b54060 ER	5
	6	# if we should init dm-multipath at boot
	7	have_multipath=no
	8
c3b54060 ER	9	# dm-multipath wwid which is used for rootfs
	10	MPATH_WWID=
	11
c124d0cf ER	12	# setup geninitrd module
	13	# @access public
	14	setup_mod_multipath() {
6e49b0b1	15	if [ ! -x /sbin/multipath ]; then
c124d0cf ER	16	USE_MULTIPATH=no
	17	fi
	18	}
	19
c3b54060 ER	20	# return true if node is multipath controlled
	21	# @param string $node device node to be examined
	22	# @access public
	23	is_multipath() {
	24	local devpath="$1"
	25
	26	# multipath disabled
ecd7bf46	27	if is_no "$USE_MULTIPATH"; then
c3b54060 ER	28	return 1
	29	fi
	30
	31	# multipath nodes are under device mapper
	32	if [[ "$devpath" != /dev/mapper/* ]]; then
	33	return 1
	34	fi
	35
	36	DM_NAME=
	37	eval $(dm_export "$devpath")
	38	if [ -z "$DM_NAME" ]; then
5d51e3e9	39	die "Couldn't extract DM_NAME from $devpath"
c3b54060 ER	40	fi
	41
	42	local MPATH_WWID=${DM_UUID##*-}
e2c75552 ER	43
e2c75552 ER	44	# just check if it is valid.
c3b54060 ER	45	local info=$(multipath -l $MPATH_WWID)
	46	if [ -z "$info" ]; then
	47	return 1
	48	fi
	49
	50	return 0
	51	}
	52
	53	# find modules for $devpath
	54	# @param $devpath device to be examined
	55	# @access public
	56	# find dm-multipath modules for $devpath
	57	# returns false if $devpath is not dm-multipath
	58	find_modules_multipath() {
	59	local devpath="$1"
	60
	61	DM_NAME=
	62	eval $(dm_export "$devpath")
	63	if [ -z "$DM_NAME" ]; then
ecd7bf46	64	die "Couldn't extract DM_NAME from $devpath"
c3b54060 ER	65	fi
	66
	67	# Partition:
	68	# DM_NAME=LUN-28p1
	69	# DM_UUID=part1-mpath-36006016002c11800a0aa05fbfae0db11
	70	# Disk:
	71	# DM_NAME=LUN-28
	72	# DM_UUID=mpath-36006016002c11800a0aa05fbfae0db11
	73	MPATH_WWID=${DM_UUID##*-}
	74
	75	local info=$(multipath -l $MPATH_WWID)
	76	if [ -z "$info" ]; then
	77	return 1
	78	fi
	79
	80	debug "Finding modules for dm-multipath (WWID=$MPATH_WWID)"
	81	have_multipath=yes
e2c75552 ER	82
	83	local p list
	84	list=$(mp_parse_devs "$info")
	85	for p in $list; do
	86	find_modules_for_devpath $p
	87	lvm_ignore_devices="$lvm_ignore_devices $p"
c3b54060 ER	88	done
c3b54060 ER	89
e2c75552 ER	90	# TODO: handle newer multipath-tools:
	91	# size=7.0G features='0' hwhandler='0' wp=rw
	92	list=$(echo "$info" \| awk '/hwhandler=1/{sub(/.*hwhandler=1 /, ""); sub(/\]$/, ""); print}')
	93	for p in $list; do
	94	find_module "dm-$p"
c3b54060 ER	95	done
c3b54060 ER	96
e2c75552 ER	97	list=$(mp_parse_policy "$info")
	98	for p in $list; do
	99	find_module "dm-$p"
c3b54060 ER	100	done
c3b54060 ER	101
b02a6b13	102	find_module "dm-mod"
c3b54060 ER	103	return 0
	104	}
	105
	106	# generate initrd fragment
	107	# @access public
	108	initrd_gen_multipath() {
	109	inst_d /sbin /lib/udev /etc/multipath
	110	inst_exec /sbin/kpartx /sbin
	111	inst_exec /sbin/multipath /sbin
	112
	113	# for udev callouts
e2c75552 ER	114	local scsi_id=$(find_tool /lib/udev/scsi_id /sbin/scsi_id)
	115	inst_exec $scsi_id /lib/udev
	116
	117	if [ -d /lib/multipath ]; then
	118	inst_d /lib/multipath
	119	inst_exec /lib/multipath/* /lib/multipath
	120	else
	121	inst_exec /sbin/mpath* /sbin
	122	fi
	123
c3b54060 ER	124	egrep -v '^([ ]*$\|#)' /etc/multipath.conf > $DESTDIR/etc/multipath.conf
	125
	126	if [ -f /etc/multipath/bindings ]; then
	127	egrep -v '^([ ]*$\|#)' /etc/multipath/bindings > $DESTDIR/etc/multipath/bindings
	128	else
	129	touch $DESTDIR/etc/multipath/bindings
	130	fi
	131
	132	mount_dev
	133	initrd_gen_devices
	134
	135	mount_sys
	136	echo "export MPATH_WWID=$MPATH_WWID" \| add_linuxrc
	137	add_linuxrc <<-'EOF'
	138	# parse mpath_wwid= from kernel commandline
	139	for arg in $CMDLINE; do
	140	if [ "${arg##mpath_wwid=}" != "${arg}" ]; then
	141	MPATH_WWID=${arg##mpath_wwid=}
	142	if [ "$MPATH_WWID" = "*" ]; then
	143	# '*' would mean activate all WWID-s
	144	MPATH_WWID=
	145	echo "multipath: Activating all WWID-s"
	146	else
	147	echo "multipath: Activating WWID=$WWID"
	148	fi
	149	fi
	150	done
	151
	152	debugshell
	153	/sbin/multipath -v 0 $MPATH_WWID
	154
	155	for a in /dev/mapper/*; do
	156	[ $a = /dev/mapper/control ] && continue
	157	/sbin/kpartx -a -p p $a
	158	done
	159	debugshell
	160	EOF
	161	}
6ae2e4d0 ER	162
	163
	164	# PRIVATE METHODS
	165	# export info from dmsetup
	166	# param can be:
	167	# - MAJOR:MINOR
	168	# - /dev/dm-MINOR
	169	# - /dev/mapper/DM_NAME
	170	dm_export() {
	171	local arg="$1"
	172
	173	case "$arg" in
	174	:)
	175	local maj=${arg%:} min=${arg#:}
	176	dmsetup -j $maj -m $min export
	177	;;
	178	/dev/dm-*)
	179	local min=${arg#*dm-}
	180	local maj=$(awk '$2 == "device-mapper" {print $1}' /proc/devices)
	181	dm_export $maj:$min
	182	;;
	183	/dev/mapper/*)
	184	local dm_name=${arg#/dev/mapper/}
	185	dmsetup export $dm_name
	186	;;
	187	*)
	188	die "dm_export: unexpected $arg"
	189	;;
	190	esac
	191	}
	192
e2c75552 ER	193	# parse blockdevices behind multipath device
	194	# takes 'multipath -l' output as input
	195	mp_parse_devs() {
	196	local info="$1"
	197
	198	# parse "0:0:1:0 sdf" -> /dev/sdf
	199	#
	200	# multipath-tools-0.4.8-0.12.amd64
	201	# LUN-02 (36006016002c11800ce520d27c6ebda11) dm-0 DGC ,RAID 10
	202	# [size=12G][features=1 queue_if_no_path][hwhandler=1 emc]
	203	# \_ round-robin 0 [prio=0][active]
	204	# \_ 0:0:0:0 sda 8:0 [active][undef]
	205	# \_ round-robin 0 [prio=0][enabled]
	206	# \_ 0:0:1:0 sdf 8:80 [active][undef]
	207	#
	208	# multipath-tools-0.4.8-9.x86_64
	209	# LUN-14 (36006016002c118006f4f8bccc7fada11) dm-3 ,
	210	# size=7.0G features='0' hwhandler='0' wp=rw
	211	# \|-+- policy='round-robin 0' prio=-1 status=enabled
	212	# \| `- #:#:#:# sde 8:64 failed undef running
	213	# `-+- policy='round-robin 0' prio=-1 status=active
	214	# `- #:#:#:# sdb 8:16 active undef running
	215
	216	echo "$info" \| awk '{
	217	if (match($0, /[#0-9]+:[#0-9]+:[#0-9]+:[#0-9]+ [^ ]+ [0-9]+:[0-9]/)) {
	218	# take whole matched part into "l" variable
	219	l = substr($0, RSTART, RLENGTH);
	220	split(l, a, " ");
	221	printf("/dev/%s\n", a[2])
	222	}
	223	}'
	224	}
	225
	226	# parse policy output for each device
	227	# takes 'multipath -l' output as input
	228	mp_parse_policy() {
	229	local info="$1"
	230
	231	# multipath-tools-0.4.8-0.12.amd64
	232	# LUN-02 (36006016002c11800ce520d27c6ebda11) dm-0 DGC ,RAID 10
	233	# [size=12G][features=1 queue_if_no_path][hwhandler=1 emc]
	234	# \_ round-robin 0 [prio=0][active]
	235	# \_ 0:0:0:0 sda 8:0 [active][undef]
	236	# \_ round-robin 0 [prio=0][enabled]
	237	# \_ 0:0:1:0 sdf 8:80 [active][undef]
	238	#
	239	# multipath-tools-0.4.8-9.x86_64
	240	# LUN-14 (36006016002c118006f4f8bccc7fada11) dm-3 ,
	241	# size=7.0G features='0' hwhandler='0' wp=rw
	242	# \|-+- policy='round-robin 0' prio=-1 status=enabled
	243	# \| `- #:#:#:# sde 8:64 failed undef running
	244	# `-+- policy='round-robin 0' prio=-1 status=active
	245	# `- #:#:#:# sdb 8:16 active undef running
	246
	247	echo "$info" \| awk '
	248	# multipath-tools-0.4.8-0.12.amd64
	249	/\[prio=/{
	250	print $2
	251	}
	252	# multipath-tools-0.4.8-9.x86_64
	253	/policy=/{
	254	if (match($0, /policy=[^ ]+/)) {
	255	# take whole matched part into "l" variable
	256	l = substr($0, RSTART, RLENGTH);
257	# remove policy= and single quote,
258	# which we can not use in this awk inline script, therefore the %c hack
259	sub(sprintf("^policy=%c?", 39), "", l);
260	print l
261	}
262	}
263	' \| sort -u
264	}