[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

	verbose "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

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

	if [ -f /etc/multipath/bindings ]; then
		grep -Ev '^([ 	]*$|#)' /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 \([^']*\)'.*$,scsi-dh-\1,
			p
		}
	" | sort -u
}
Commit	Line	Data
c3b54060	1	#!/bin/sh
c3b54060	2	# geninitrd mod: dm-multipath
6e49b0b1	3	USE_MULTIPATH=${USE_MULTIPATH:-yes}
c3b54060 ER	4
	5	# if we should init dm-multipath at boot
	6	have_multipath=no
	7
c3b54060 ER	8	# dm-multipath wwid which is used for rootfs
	9	MPATH_WWID=
	10
c124d0cf ER	11	# setup geninitrd module
	12	# @access public
	13	setup_mod_multipath() {
6e49b0b1	14	if [ ! -x /sbin/multipath ]; then
c124d0cf ER	15	USE_MULTIPATH=no
	16	fi
	17	}
	18
c3b54060 ER	19	# return true if node is multipath controlled
	20	# @param string $node device node to be examined
	21	# @access public
	22	is_multipath() {
	23	local devpath="$1"
	24
	25	# multipath disabled
ecd7bf46	26	if is_no "$USE_MULTIPATH"; then
c3b54060 ER	27	return 1
	28	fi
	29
	30	# multipath nodes are under device mapper
	31	if [[ "$devpath" != /dev/mapper/* ]]; then
	32	return 1
	33	fi
	34
	35	DM_NAME=
	36	eval $(dm_export "$devpath")
	37	if [ -z "$DM_NAME" ]; then
5d51e3e9	38	die "Couldn't extract DM_NAME from $devpath"
c3b54060 ER	39	fi
	40
	41	local MPATH_WWID=${DM_UUID##*-}
e2c75552 ER	42
e2c75552 ER	43	# just check if it is valid.
c3b54060 ER	44	local info=$(multipath -l $MPATH_WWID)
	45	if [ -z "$info" ]; then
	46	return 1
	47	fi
	48
	49	return 0
	50	}
	51
	52	# find modules for $devpath
	53	# @param $devpath device to be examined
	54	# @access public
	55	# find dm-multipath modules for $devpath
	56	# returns false if $devpath is not dm-multipath
	57	find_modules_multipath() {
	58	local devpath="$1"
	59
	60	DM_NAME=
	61	eval $(dm_export "$devpath")
	62	if [ -z "$DM_NAME" ]; then
ecd7bf46	63	die "Couldn't extract DM_NAME from $devpath"
c3b54060 ER	64	fi
	65
	66	# Partition:
	67	# DM_NAME=LUN-28p1
	68	# DM_UUID=part1-mpath-36006016002c11800a0aa05fbfae0db11
	69	# Disk:
	70	# DM_NAME=LUN-28
	71	# DM_UUID=mpath-36006016002c11800a0aa05fbfae0db11
	72	MPATH_WWID=${DM_UUID##*-}
	73
	74	local info=$(multipath -l $MPATH_WWID)
	75	if [ -z "$info" ]; then
	76	return 1
	77	fi
	78
02ba8ab7	79	verbose "Finding modules for dm-multipath (WWID=$MPATH_WWID)"
c3b54060	80	have_multipath=yes
e2c75552 ER	81
	82	local p list
	83	list=$(mp_parse_devs "$info")
	84	for p in $list; do
	85	find_modules_for_devpath $p
	86	lvm_ignore_devices="$lvm_ignore_devices $p"
c3b54060 ER	87	done
c3b54060 ER	88
ddc299f5	89	list=$(mp_parse_hwhandler "$info")
e2c75552	90	for p in $list; do
ddc299f5	91	find_module "$p"
c3b54060 ER	92	done
c3b54060 ER	93
e2c75552 ER	94	list=$(mp_parse_policy "$info")
	95	for p in $list; do
	96	find_module "dm-$p"
c3b54060 ER	97	done
c3b54060 ER	98
b02a6b13	99	find_module "dm-mod"
c3b54060 ER	100	return 0
	101	}
	102
	103	# generate initrd fragment
	104	# @access public
	105	initrd_gen_multipath() {
1b481849 ER	106	if ! is_yes "$have_multipath"; then
	107	return
	108	fi
	109
c3b54060 ER	110	inst_d /sbin /lib/udev /etc/multipath
	111	inst_exec /sbin/kpartx /sbin
	112	inst_exec /sbin/multipath /sbin
	113
	114	# for udev callouts
07de5194	115	local scsi_id=$(find_tool /$_lib/udev/scsi_id /lib/udev/scsi_id /sbin/scsi_id)
e2c75552 ER	116	inst_exec $scsi_id /lib/udev
e2c75552 ER	117
c1a60691 ER	118	if [ -d /$_lib/multipath ]; then
	119	inst_d /$_lib/multipath
	120	inst_exec /$_lib/multipath/* /$_lib/multipath
e2c75552 ER	121	else
	122	inst_exec /sbin/mpath* /sbin
	123	fi
	124
e871f497	125	grep -Ev '^([ ]*$\|#)' /etc/multipath.conf > $DESTDIR/etc/multipath.conf
c3b54060 ER	126
c3b54060 ER	127	if [ -f /etc/multipath/bindings ]; then
e871f497	128	grep -Ev '^([ ]*$\|#)' /etc/multipath/bindings > $DESTDIR/etc/multipath/bindings
c3b54060 ER	129	else
	130	touch $DESTDIR/etc/multipath/bindings
	131	fi
	132
	133	mount_dev
	134	initrd_gen_devices
	135
	136	mount_sys
	137	echo "export MPATH_WWID=$MPATH_WWID" \| add_linuxrc
	138	add_linuxrc <<-'EOF'
	139	# parse mpath_wwid= from kernel commandline
	140	for arg in $CMDLINE; do
	141	if [ "${arg##mpath_wwid=}" != "${arg}" ]; then
	142	MPATH_WWID=${arg##mpath_wwid=}
	143	if [ "$MPATH_WWID" = "*" ]; then
	144	# '*' would mean activate all WWID-s
	145	MPATH_WWID=
	146	echo "multipath: Activating all WWID-s"
	147	else
	148	echo "multipath: Activating WWID=$WWID"
	149	fi
	150	fi
	151	done
	152
	153	debugshell
	154	/sbin/multipath -v 0 $MPATH_WWID
	155
	156	for a in /dev/mapper/*; do
	157	[ $a = /dev/mapper/control ] && continue
	158	/sbin/kpartx -a -p p $a
	159	done
	160	debugshell
	161	EOF
	162	}
6ae2e4d0 ER	163
	164
	165	# PRIVATE METHODS
	166	# export info from dmsetup
	167	# param can be:
	168	# - MAJOR:MINOR
	169	# - /dev/dm-MINOR
	170	# - /dev/mapper/DM_NAME
	171	dm_export() {
	172	local arg="$1"
	173
	174	case "$arg" in
	175	:)
	176	local maj=${arg%:} min=${arg#:}
	177	dmsetup -j $maj -m $min export
	178	;;
	179	/dev/dm-*)
	180	local min=${arg#*dm-}
	181	local maj=$(awk '$2 == "device-mapper" {print $1}' /proc/devices)
	182	dm_export $maj:$min
	183	;;
	184	/dev/mapper/*)
	185	local dm_name=${arg#/dev/mapper/}
	186	dmsetup export $dm_name
	187	;;
	188	*)
	189	die "dm_export: unexpected $arg"
	190	;;
	191	esac
	192	}
	193
e2c75552 ER	194	# parse blockdevices behind multipath device
	195	# takes 'multipath -l' output as input
	196	mp_parse_devs() {
	197	local info="$1"
	198
	199	# parse "0:0:1:0 sdf" -> /dev/sdf
	200	#
	201	# multipath-tools-0.4.8-0.12.amd64
	202	# LUN-02 (36006016002c11800ce520d27c6ebda11) dm-0 DGC ,RAID 10
	203	# [size=12G][features=1 queue_if_no_path][hwhandler=1 emc]
	204	# \_ round-robin 0 [prio=0][active]
	205	# \_ 0:0:0:0 sda 8:0 [active][undef]
	206	# \_ round-robin 0 [prio=0][enabled]
	207	# \_ 0:0:1:0 sdf 8:80 [active][undef]
	208	#
	209	# multipath-tools-0.4.8-9.x86_64
	210	# LUN-14 (36006016002c118006f4f8bccc7fada11) dm-3 ,
	211	# size=7.0G features='0' hwhandler='0' wp=rw
	212	# \|-+- policy='round-robin 0' prio=-1 status=enabled
	213	# \| `- #:#:#:# sde 8:64 failed undef running
	214	# `-+- policy='round-robin 0' prio=-1 status=active
	215	# `- #:#:#:# sdb 8:16 active undef running
	216
	217	echo "$info" \| awk '{
	218	if (match($0, /[#0-9]+:[#0-9]+:[#0-9]+:[#0-9]+ [^ ]+ [0-9]+:[0-9]/)) {
	219	# take whole matched part into "l" variable
	220	l = substr($0, RSTART, RLENGTH);
	221	split(l, a, " ");
	222	printf("/dev/%s\n", a[2])
	223	}
	224	}'
	225	}
	226
	227	# parse policy output for each device
	228	# takes 'multipath -l' output as input
	229	mp_parse_policy() {
	230	local info="$1"
	231
	232	# multipath-tools-0.4.8-0.12.amd64
	233	# LUN-02 (36006016002c11800ce520d27c6ebda11) dm-0 DGC ,RAID 10
	234	# [size=12G][features=1 queue_if_no_path][hwhandler=1 emc]
	235	# \_ round-robin 0 [prio=0][active]
	236	# \_ 0:0:0:0 sda 8:0 [active][undef]
	237	# \_ round-robin 0 [prio=0][enabled]
	238	# \_ 0:0:1:0 sdf 8:80 [active][undef]
	239	#
	240	# multipath-tools-0.4.8-9.x86_64
	241	# LUN-14 (36006016002c118006f4f8bccc7fada11) dm-3 ,
	242	# size=7.0G features='0' hwhandler='0' wp=rw
	243	# \|-+- policy='round-robin 0' prio=-1 status=enabled
	244	# \| `- #:#:#:# sde 8:64 failed undef running
	245	# `-+- policy='round-robin 0' prio=-1 status=active
	246	# `- #:#:#:# sdb 8:16 active undef running
	247
	248	echo "$info" \| awk '
	249	# multipath-tools-0.4.8-0.12.amd64
	250	/\[prio=/{
	251	print $2
	252	}
	253	# multipath-tools-0.4.8-9.x86_64
	254	/policy=/{
	255	if (match($0, /policy=[^ ]+/)) {
	256	# take whole matched part into "l" variable
	257	l = substr($0, RSTART, RLENGTH);
258	# remove policy= and single quote,
259	# which we can not use in this awk inline script, therefore the %c hack
260	sub(sprintf("^policy=%c?", 39), "", l);
261	print l
262	}
263	}
264	' \| sort -u
265	}
ddc299f5 ER	266
	267	# parse hwhandler from multipath output
	268	# takes 'multipath -l' output as input
	269	mp_parse_hwhandler() {
	270	local info="$1"
	271
	272	# TODO: actually the dm-emc vs scsi-dh-emc is dependant on kernel version
	273	# not version of the tools installed
	274
	275	# multipath-tools-0.4.8-0.12.amd64
	276	# [size=12G][features=1 queue_if_no_path][hwhandler=1 emc]
	277	#
	278	# multipath-tools-0.4.8-11.x86_64
	279	# size=7.0G features='0' hwhandler='0' wp=rw
	280	# size=2.0G features='1 queue_if_no_path' hwhandler='1 emc' wp=rw
	281	echo "$info" \| sed -ne "
9802850b ER	282	# multipath-tools-0.4.8-0.12.amd64
	283	/\[hwhandler=1/{
	284	s,^.\[hwhandler=1 \([^]]\)\].*$,dm-\1,
	285	p
	286	}
ddc299f5	287	# multipath-tools-0.4.8-11.x86_64
9802850b ER	288	/hwhandler='1/{
	289	s,^.hwhandler='1 \([^']\)'.*$,scsi-dh-\1,
	290	p
	291	}
	292	" \| sort -u
ddc299f5	293	}