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

#!/bin/sh
MULTIPATH_RCSID='$Revision$ $Date::                            $'

# 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

	list=$(mp_parse_hwhandler "$info")
	for p in $list; do
		find_module "$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() {
	if ! is_yes "$have_multipath"; then
		return
	fi

	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 /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
}

# parse hwhandler from multipath output
# takes 'multipath -l' output as input
mp_parse_hwhandler() {
	local info="$1"

	# TODO: actually the dm-emc vs scsi-dh-emc is dependant on kernel version
	# not version of the tools installed

	# multipath-tools-0.4.8-0.12.amd64
	# [size=12G][features=1 queue_if_no_path][hwhandler=1 emc]
	#
	# multipath-tools-0.4.8-11.x86_64
	# size=7.0G features='0' hwhandler='0' wp=rw
	# size=2.0G features='1 queue_if_no_path' hwhandler='1 emc' wp=rw
	echo "$info" | sed -ne "
		# multipath-tools-0.4.8-0.12.amd64
		/\[hwhandler=1/{
			s,^.*\[hwhandler=1 \([^]]*\)\].*$,dm-\1,
			p
		}
		# multipath-tools-0.4.8-11.x86_64
		/hwhandler='1/{
			s,^.*hwhandler='1 \([^']*\)'.*$,scsi-dh-\1,
			p
		}
	" | sort -u
}
Commit	Line	Data
c3b54060	1	#!/bin/sh
c34c6a69	2	MULTIPATH_RCSID='$Revision$ $Date:: $'
05c474b5	3
c3b54060	4	# geninitrd mod: dm-multipath
6e49b0b1	5	USE_MULTIPATH=${USE_MULTIPATH:-yes}
c3b54060 ER	6
	7	# if we should init dm-multipath at boot
	8	have_multipath=no
	9
c3b54060 ER	10	# dm-multipath wwid which is used for rootfs
	11	MPATH_WWID=
	12
c124d0cf ER	13	# setup geninitrd module
	14	# @access public
	15	setup_mod_multipath() {
6e49b0b1	16	if [ ! -x /sbin/multipath ]; then
c124d0cf ER	17	USE_MULTIPATH=no
	18	fi
	19	}
	20
c3b54060 ER	21	# return true if node is multipath controlled
	22	# @param string $node device node to be examined
	23	# @access public
	24	is_multipath() {
	25	local devpath="$1"
	26
	27	# multipath disabled
ecd7bf46	28	if is_no "$USE_MULTIPATH"; then
c3b54060 ER	29	return 1
	30	fi
	31
	32	# multipath nodes are under device mapper
	33	if [[ "$devpath" != /dev/mapper/* ]]; then
	34	return 1
	35	fi
	36
	37	DM_NAME=
	38	eval $(dm_export "$devpath")
	39	if [ -z "$DM_NAME" ]; then
5d51e3e9	40	die "Couldn't extract DM_NAME from $devpath"
c3b54060 ER	41	fi
	42
	43	local MPATH_WWID=${DM_UUID##*-}
e2c75552 ER	44
e2c75552 ER	45	# just check if it is valid.
c3b54060 ER	46	local info=$(multipath -l $MPATH_WWID)
	47	if [ -z "$info" ]; then
	48	return 1
	49	fi
	50
	51	return 0
	52	}
	53
	54	# find modules for $devpath
	55	# @param $devpath device to be examined
	56	# @access public
	57	# find dm-multipath modules for $devpath
	58	# returns false if $devpath is not dm-multipath
	59	find_modules_multipath() {
	60	local devpath="$1"
	61
	62	DM_NAME=
	63	eval $(dm_export "$devpath")
	64	if [ -z "$DM_NAME" ]; then
ecd7bf46	65	die "Couldn't extract DM_NAME from $devpath"
c3b54060 ER	66	fi
	67
	68	# Partition:
	69	# DM_NAME=LUN-28p1
	70	# DM_UUID=part1-mpath-36006016002c11800a0aa05fbfae0db11
	71	# Disk:
	72	# DM_NAME=LUN-28
	73	# DM_UUID=mpath-36006016002c11800a0aa05fbfae0db11
	74	MPATH_WWID=${DM_UUID##*-}
	75
	76	local info=$(multipath -l $MPATH_WWID)
	77	if [ -z "$info" ]; then
	78	return 1
	79	fi
	80
	81	debug "Finding modules for dm-multipath (WWID=$MPATH_WWID)"
	82	have_multipath=yes
e2c75552 ER	83
	84	local p list
	85	list=$(mp_parse_devs "$info")
	86	for p in $list; do
	87	find_modules_for_devpath $p
	88	lvm_ignore_devices="$lvm_ignore_devices $p"
c3b54060 ER	89	done
c3b54060 ER	90
ddc299f5	91	list=$(mp_parse_hwhandler "$info")
e2c75552	92	for p in $list; do
ddc299f5	93	find_module "$p"
c3b54060 ER	94	done
c3b54060 ER	95
e2c75552 ER	96	list=$(mp_parse_policy "$info")
	97	for p in $list; do
	98	find_module "dm-$p"
c3b54060 ER	99	done
c3b54060 ER	100
b02a6b13	101	find_module "dm-mod"
c3b54060 ER	102	return 0
	103	}
	104
	105	# generate initrd fragment
	106	# @access public
	107	initrd_gen_multipath() {
1b481849 ER	108	if ! is_yes "$have_multipath"; then
	109	return
	110	fi
	111
c3b54060 ER	112	inst_d /sbin /lib/udev /etc/multipath
	113	inst_exec /sbin/kpartx /sbin
	114	inst_exec /sbin/multipath /sbin
	115
	116	# for udev callouts
07de5194	117	local scsi_id=$(find_tool /$_lib/udev/scsi_id /lib/udev/scsi_id /sbin/scsi_id)
e2c75552 ER	118	inst_exec $scsi_id /lib/udev
e2c75552 ER	119
c1a60691 ER	120	if [ -d /$_lib/multipath ]; then
	121	inst_d /$_lib/multipath
	122	inst_exec /$_lib/multipath/* /$_lib/multipath
e2c75552 ER	123	else
	124	inst_exec /sbin/mpath* /sbin
	125	fi
	126
c3b54060 ER	127	egrep -v '^([ ]*$\|#)' /etc/multipath.conf > $DESTDIR/etc/multipath.conf
	128
	129	if [ -f /etc/multipath/bindings ]; then
	130	egrep -v '^([ ]*$\|#)' /etc/multipath/bindings > $DESTDIR/etc/multipath/bindings
	131	else
	132	touch $DESTDIR/etc/multipath/bindings
	133	fi
	134
	135	mount_dev
	136	initrd_gen_devices
	137
	138	mount_sys
	139	echo "export MPATH_WWID=$MPATH_WWID" \| add_linuxrc
	140	add_linuxrc <<-'EOF'
	141	# parse mpath_wwid= from kernel commandline
	142	for arg in $CMDLINE; do
	143	if [ "${arg##mpath_wwid=}" != "${arg}" ]; then
	144	MPATH_WWID=${arg##mpath_wwid=}
	145	if [ "$MPATH_WWID" = "*" ]; then
	146	# '*' would mean activate all WWID-s
	147	MPATH_WWID=
	148	echo "multipath: Activating all WWID-s"
	149	else
	150	echo "multipath: Activating WWID=$WWID"
	151	fi
	152	fi
	153	done
	154
	155	debugshell
	156	/sbin/multipath -v 0 $MPATH_WWID
	157
	158	for a in /dev/mapper/*; do
	159	[ $a = /dev/mapper/control ] && continue
	160	/sbin/kpartx -a -p p $a
	161	done
	162	debugshell
	163	EOF
	164	}
6ae2e4d0 ER	165
	166
	167	# PRIVATE METHODS
	168	# export info from dmsetup
	169	# param can be:
	170	# - MAJOR:MINOR
	171	# - /dev/dm-MINOR
	172	# - /dev/mapper/DM_NAME
	173	dm_export() {
	174	local arg="$1"
	175
	176	case "$arg" in
	177	:)
	178	local maj=${arg%:} min=${arg#:}
	179	dmsetup -j $maj -m $min export
	180	;;
	181	/dev/dm-*)
	182	local min=${arg#*dm-}
	183	local maj=$(awk '$2 == "device-mapper" {print $1}' /proc/devices)
	184	dm_export $maj:$min
	185	;;
	186	/dev/mapper/*)
	187	local dm_name=${arg#/dev/mapper/}
	188	dmsetup export $dm_name
	189	;;
	190	*)
	191	die "dm_export: unexpected $arg"
	192	;;
	193	esac
	194	}
	195
e2c75552 ER	196	# parse blockdevices behind multipath device
	197	# takes 'multipath -l' output as input
	198	mp_parse_devs() {
	199	local info="$1"
	200
	201	# parse "0:0:1:0 sdf" -> /dev/sdf
	202	#
	203	# multipath-tools-0.4.8-0.12.amd64
	204	# LUN-02 (36006016002c11800ce520d27c6ebda11) dm-0 DGC ,RAID 10
	205	# [size=12G][features=1 queue_if_no_path][hwhandler=1 emc]
	206	# \_ round-robin 0 [prio=0][active]
	207	# \_ 0:0:0:0 sda 8:0 [active][undef]
	208	# \_ round-robin 0 [prio=0][enabled]
	209	# \_ 0:0:1:0 sdf 8:80 [active][undef]
	210	#
	211	# multipath-tools-0.4.8-9.x86_64
	212	# LUN-14 (36006016002c118006f4f8bccc7fada11) dm-3 ,
	213	# size=7.0G features='0' hwhandler='0' wp=rw
	214	# \|-+- policy='round-robin 0' prio=-1 status=enabled
	215	# \| `- #:#:#:# sde 8:64 failed undef running
	216	# `-+- policy='round-robin 0' prio=-1 status=active
	217	# `- #:#:#:# sdb 8:16 active undef running
	218
	219	echo "$info" \| awk '{
	220	if (match($0, /[#0-9]+:[#0-9]+:[#0-9]+:[#0-9]+ [^ ]+ [0-9]+:[0-9]/)) {
	221	# take whole matched part into "l" variable
	222	l = substr($0, RSTART, RLENGTH);
	223	split(l, a, " ");
	224	printf("/dev/%s\n", a[2])
	225	}
	226	}'
	227	}
	228
	229	# parse policy output for each device
	230	# takes 'multipath -l' output as input
	231	mp_parse_policy() {
	232	local info="$1"
	233
	234	# multipath-tools-0.4.8-0.12.amd64
	235	# LUN-02 (36006016002c11800ce520d27c6ebda11) dm-0 DGC ,RAID 10
	236	# [size=12G][features=1 queue_if_no_path][hwhandler=1 emc]
	237	# \_ round-robin 0 [prio=0][active]
	238	# \_ 0:0:0:0 sda 8:0 [active][undef]
	239	# \_ round-robin 0 [prio=0][enabled]
	240	# \_ 0:0:1:0 sdf 8:80 [active][undef]
	241	#
	242	# multipath-tools-0.4.8-9.x86_64
	243	# LUN-14 (36006016002c118006f4f8bccc7fada11) dm-3 ,
	244	# size=7.0G features='0' hwhandler='0' wp=rw
	245	# \|-+- policy='round-robin 0' prio=-1 status=enabled
	246	# \| `- #:#:#:# sde 8:64 failed undef running
	247	# `-+- policy='round-robin 0' prio=-1 status=active
	248	# `- #:#:#:# sdb 8:16 active undef running
	249
	250	echo "$info" \| awk '
	251	# multipath-tools-0.4.8-0.12.amd64
	252	/\[prio=/{
	253	print $2
	254	}
	255	# multipath-tools-0.4.8-9.x86_64
	256	/policy=/{
	257	if (match($0, /policy=[^ ]+/)) {
	258	# take whole matched part into "l" variable
	259	l = substr($0, RSTART, RLENGTH);
260	# remove policy= and single quote,
261	# which we can not use in this awk inline script, therefore the %c hack
262	sub(sprintf("^policy=%c?", 39), "", l);
263	print l
264	}
265	}
266	' \| sort -u
267	}
ddc299f5 ER	268
	269	# parse hwhandler from multipath output
	270	# takes 'multipath -l' output as input
	271	mp_parse_hwhandler() {
	272	local info="$1"
	273
	274	# TODO: actually the dm-emc vs scsi-dh-emc is dependant on kernel version
	275	# not version of the tools installed
	276
	277	# multipath-tools-0.4.8-0.12.amd64
	278	# [size=12G][features=1 queue_if_no_path][hwhandler=1 emc]
	279	#
	280	# multipath-tools-0.4.8-11.x86_64
	281	# size=7.0G features='0' hwhandler='0' wp=rw
	282	# size=2.0G features='1 queue_if_no_path' hwhandler='1 emc' wp=rw
	283	echo "$info" \| sed -ne "
9802850b ER	284	# multipath-tools-0.4.8-0.12.amd64
	285	/\[hwhandler=1/{
	286	s,^.\[hwhandler=1 \([^]]\)\].*$,dm-\1,
	287	p
	288	}
ddc299f5	289	# multipath-tools-0.4.8-11.x86_64
9802850b ER	290	/hwhandler='1/{
	291	s,^.hwhandler='1 \([^']\)'.*$,scsi-dh-\1,
	292	p
	293	}
	294	" \| sort -u
ddc299f5	295	}