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

#!/bin/sh
#
# geninitrd mod: LVM
USE_LVM=${USE_LVM:-yes}

# if we should init LVM at boot
have_lvm=no

# LVM volumes that are needed to activate
# VG for root dev
# @internal
ROOTVG=""

# VG for suspend resume dev
SUSPENDVG=""

VGVOLUMES=""

# LVM version. Autodetected if not set.
# Values: 1|2
LVMTOOLSVERSION=

# LVM devices that should not be included in vgscan on initrd.
# @internal
lvm_ignore_devices=''

# setup geninitrd module
# @access	public
setup_mod_lvm() {
	lvm=$(find_tool $initrd_dir/lvm /sbin/initrd-lvm)

	if [ ! -x "$lvm" ]; then
		USE_LVM=no
	fi

	if is_yes "$USE_LVM" && [ -z "$LVMTOOLSVERSION" ]; then
		LVMTOOLSVERSION=$(LC_ALL=C $lvm vgchange --version 2>/dev/null | awk '/LVM version:/{if ($3 >= 2) print "2"}')
		if [ -z "$LVMTOOLSVERSION" ]; then
			die "Can't determine LVM tools version (is /sys mounted?). Please set LVMTOOLSVERSION and rerun $PROGRAM."
		fi
	fi
}

# return true if node is lvm node
# @param	string $node device node to be examined
# @access	public
is_lvm() {
	local node="$1"

	# LVM not wanted
	if is_no "$USE_LVM"; then
		return 1
	fi

	if [ ! -e "$node" ]; then
		die "check_lvm(): node $node doesn't exist!"
		return 1
	fi

	# block-major-58 is lvm1
	ls -lL "$node" 2> /dev/null | awk '{if (/^b/) { if ($5 == "58,") { exit 0; } else { exit 1; } } else { exit 1; }}'
	rc=$?

	if [ $rc = 0 ]; then
		# is lvm1
		return 0
	fi

	$lvm lvdisplay "$node" > /dev/null 2>&1
	rc=$?
	if [ $rc -gt 127 ]; then
		# lvdisplay terminated by signal! most likely it segfaulted.
		die "Unexpected exit from 'lvdisplay $node': $rc - are your lvm tools broken?"
	fi

	return $rc
}

# find modules for $devpath
# @param	$devpath	device to be examined
# @access	public
find_modules_lvm() {
	local devpath="$1"

	debug "LVM: $devpath is LVM node"

	local vg=$(find_lvm_vg "$devpath")
	debug "LVM VG for $devpath: $vg"
	VGVOLUMES=$(echo $VGVOLUMES $vg | tr ' ' '\n' | sort -u)

	local pv=$(find_lvm_pv "$vg")
	debug "LVM PV for $vg: $pv"
	PVDEVICES=$(echo $PVDEVICES $pv | tr ' ' '\n' | sort -u)

	if [ -n "$PVDEVICES" ]; then
		for device in $PVDEVICES; do
			find_modules_for_devpath $device
		done
	else
		die "I wasn't able to find PV. You can try to set PVDEVICES in /etc/sysconfig/geninitrd."
	fi

	if [ "$LVMTOOLSVERSION" = "2" ]; then
		find_module "-dm-mod"
	elif [ "$LVMTOOLSVERSION" = "1" ]; then
		find_module "-lvm"
		find_module "-lvm-mod"
	else
		die "LVM version $LVMTOOLSVERSION is not supported."
	fi

	debug "LVM v$LVMTOOLSVERSION enabled"
	have_lvm=yes
}


# generate initrd fragment for lvm
# @access	public
initrd_gen_lvm() {
	debug "Adding LVM support to initrd"
	inst_d /tmp /newroot
	inst_exec $lvm /bin/lvm.static

	# always make /dev on tmpfs for LVM2
	if [ "$LVMTOOLSVERSION" = "2" ]; then
		mount_dev
	fi

	if ! is_yes "$dev_mounted"; then
		inst_d /dev/mapper
		mknod $DESTDIR/dev/mapper/control c 10 63
		for device in $PVDEVICES; do
			# if LVM on RAID then device might be copied already in gen_md
			[ -e "$DESTDIR/dev/$(basename $device)" ] && continue
			inst $device /dev
		done
	fi

	mount_tmp
	mount_sys
	if [ "$LVMTOOLSVERSION" = "1" ]; then
		add_linuxrc <<-EOF
			lvm vgscan -T
			for vg in $VGVOLUMES; do
				lvm vgchange -T -a y $vg
			done
		EOF
	else
		echo "cat /etc/lvm.conf > /tmp/lvm.conf" | add_linuxrc
		echo "global {" > "$DESTDIR/etc/lvm.conf"
		echo "	locking_type = 0" >> "$DESTDIR/etc/lvm.conf"
		echo "	locking_dir = \"/tmp\"" >> "$DESTDIR/etc/lvm.conf"
		echo "}" >> "$DESTDIR/etc/lvm.conf"
		echo "devices {" >> "$DESTDIR/etc/lvm.conf"
		echo "	sysfs_scan=0" >> "$DESTDIR/etc/lvm.conf"
		if is_yes "$have_md"; then
			echo "	md_component_detection = 1" >> "$DESTDIR/etc/lvm.conf"
		fi
		if is_yes "$have_dmraid" || is_yes "$have_multipath"; then
			echo '	types = [ "device-mapper", 254 ]' >> "$DESTDIR/etc/lvm.conf"
		fi
		if [ "$lvm_ignore_devices" ]; then
			# TODO: think of merging with lvm dumpconfig output
			echo '	filter = [' >> "$DESTDIR/etc/lvm.conf"
			local dev
			for dev in $lvm_ignore_devices; do
				debug "LVM v2: ignore device $dev"
				printf '  "r|^%s.*|",\n' $dev
			done >> "$DESTDIR/etc/lvm.conf"
			echo ']' >> "$DESTDIR/etc/lvm.conf"
		fi
		# XXX filter= must be on one line!
		$lvm dumpconfig | awk '/filter=/' >> "$DESTDIR/etc/lvm.conf"
		echo "}" >> "$DESTDIR/etc/lvm.conf"

		initrd_gen_devices

		add_linuxrc <<-EOF
			export ROOTDEV=$rootdev
			export ROOTVG="$VGVOLUMES"
			export SUSPENDVG=$SUSPENDVG
		EOF
		add_linuxrc <<-'EOF'
			# parse rootdev from kernel commandline if it begins with /
			case "$ROOT" in
				/*)

				# rewrite /dev/mapper/sys-rootfs -> /dev/sys/rootfs
				case "$ROOT" in
					/dev/mapper/*-*)
						ROOT=${ROOT#/dev/mapper/}
						local VG=${ROOT%%-*}
						local LV=${ROOT#*-}
						ROOT=/dev/$VG/$LV
					;;
				esac

				if [ "$ROOT" != "$ROOTDEV" ]; then
					ROOTDEV=$ROOT

					echo "LVM: Using 'root=$ROOTDEV' from kernel commandline"
					local tmp=${ROOTDEV#/dev/}
					if [ "$tmp" != "$ROOTDEV" ]; then
						ROOTVG=${tmp%/*}
						echo "LVM: Using Volume Group '$ROOTVG' for rootfs"
					fi
				fi
				;;
			esac

			# skip duplicate VG
			if [ "$SUSPENDVG" = "$ROOTVG" ]; then
				export VGVOLUMES="$ROOTVG"
			else
				export VGVOLUMES="$SUSPENDVG $ROOTVG"
			fi

			# disable noise from LVM accessing devices that aren't ready.
			read printk < /proc/sys/kernel/printk
			if [ ! "$DEBUGINITRD" ]; then
				echo 0 > /proc/sys/kernel/printk
			fi

			export LVM_SYSTEM_DIR=/tmp
			: 'Scanning for Volume Groups'
			lvm.static vgscan --mknodes --ignorelockingfailure 2>/dev/null

			: 'Activating Volume Groups'
			for vol in $VGVOLUMES; do
				lvm.static vgchange --ignorelockingfailure -a y $vol 2>/dev/null
			done

			echo "$printk" > /proc/sys/kernel/printk

			# Find out major/minor
			attrs="$(lvm.static lvdisplay --ignorelockingfailure -c $ROOTDEV 2>/dev/null)"
			if [ "$attrs" ]; then
				majmin="${attrs#*$ROOTDEV*:*:*:*:*:*:*:*:*:*:*:*}"
				if [ "$majmin" != "$attrs" ]; then
					major="${majmin%:*}"
					minor="${majmin#*:}"
				fi
			fi

			if [ "$major" -a "$minor" ]; then
				# Pass it to kernel
				echo $((256 * $major + $minor)) > /proc/sys/kernel/real-root-dev
			else
				echo 2>&1 "Error figuring out real root device for $ROOTDEV!"
				echo 2>&1 "System will not most likely boot up! So dropping you to a shell!"
				echo 2>&1 ""
				sh
			fi
		EOF
	fi
}


# PRIVATE METHODS

# find PV names from given VG name
# @param	string $vg Volume Group name
# @access	private
find_lvm_pv() {
	local vg="$1"

	local pv=$($lvm vgs --noheadings -o pv_name  "$vg")
	echo $pv
}

# find VG name from given devnode
# @param	string $devnode device node to be examined
# @access	private
find_lvm_vg() {
	local devnode="$1"

	local vg=$($lvm lvs --noheadings -o vg_name  "$devnode")
	echo $vg
}
Commit	Line	Data
67aa84bd ER	1	#!/bin/sh
	2	#
	3	# geninitrd mod: LVM
6e49b0b1	4	USE_LVM=${USE_LVM:-yes}
67aa84bd ER	5
	6	# if we should init LVM at boot
	7	have_lvm=no
	8
	9	# LVM volumes that are needed to activate
	10	# VG for root dev
	11	# @internal
	12	ROOTVG=""
	13
	14	# VG for suspend resume dev
	15	SUSPENDVG=""
	16
	17	VGVOLUMES=""
	18
f0ef5219 ER	19	# LVM version. Autodetected if not set.
	20	# Values: 1\|2
	21	LVMTOOLSVERSION=
	22
67aa84bd ER	23	# LVM devices that should not be included in vgscan on initrd.
	24	# @internal
	25	lvm_ignore_devices=''
	26
c124d0cf ER	27	# setup geninitrd module
	28	# @access public
	29	setup_mod_lvm() {
	30	lvm=$(find_tool $initrd_dir/lvm /sbin/initrd-lvm)
c124d0cf	31
728b5283	32	if [ ! -x "$lvm" ]; then
6e49b0b1 ER	33	USE_LVM=no
	34	fi
	35
	36	if is_yes "$USE_LVM" && [ -z "$LVMTOOLSVERSION" ]; then
	37	LVMTOOLSVERSION=$(LC_ALL=C $lvm vgchange --version 2>/dev/null \| awk '/LVM version:/{if ($3 >= 2) print "2"}')
c124d0cf	38	if [ -z "$LVMTOOLSVERSION" ]; then
074b295e	39	die "Can't determine LVM tools version (is /sys mounted?). Please set LVMTOOLSVERSION and rerun $PROGRAM."
c124d0cf ER	40	fi
	41	fi
	42	}
	43
67aa84bd ER	44	# return true if node is lvm node
	45	# @param string $node device node to be examined
	46	# @access public
	47	is_lvm() {
	48	local node="$1"
	49
	50	# LVM not wanted
	51	if is_no "$USE_LVM"; then
	52	return 1
	53	fi
	54
	55	if [ ! -e "$node" ]; then
	56	die "check_lvm(): node $node doesn't exist!"
	57	return 1
	58	fi
	59
	60	# block-major-58 is lvm1
	61	ls -lL "$node" 2> /dev/null \| awk '{if (/^b/) { if ($5 == "58,") { exit 0; } else { exit 1; } } else { exit 1; }}'
	62	rc=$?
	63
	64	if [ $rc = 0 ]; then
	65	# is lvm1
	66	return 0
	67	fi
	68
728b5283	69	$lvm lvdisplay "$node" > /dev/null 2>&1
67aa84bd ER	70	rc=$?
	71	if [ $rc -gt 127 ]; then
	72	# lvdisplay terminated by signal! most likely it segfaulted.
	73	die "Unexpected exit from 'lvdisplay $node': $rc - are your lvm tools broken?"
	74	fi
	75
	76	return $rc
	77	}
	78
	79	# find modules for $devpath
	80	# @param $devpath device to be examined
	81	# @access public
	82	find_modules_lvm() {
	83	local devpath="$1"
	84
	85	debug "LVM: $devpath is LVM node"
	86
67aa84bd ER	87	local vg=$(find_lvm_vg "$devpath")
	88	debug "LVM VG for $devpath: $vg"
	89	VGVOLUMES=$(echo $VGVOLUMES $vg \| tr ' ' '\n' \| sort -u)
	90
	91	local pv=$(find_lvm_pv "$vg")
	92	debug "LVM PV for $vg: $pv"
	93	PVDEVICES=$(echo $PVDEVICES $pv \| tr ' ' '\n' \| sort -u)
	94
	95	if [ -n "$PVDEVICES" ]; then
	96	for device in $PVDEVICES; do
	97	find_modules_for_devpath $device
	98	done
	99	else
728b5283	100	die "I wasn't able to find PV. You can try to set PVDEVICES in /etc/sysconfig/geninitrd."
67aa84bd ER	101	fi
	102
	103	if [ "$LVMTOOLSVERSION" = "2" ]; then
b02a6b13	104	find_module "-dm-mod"
67aa84bd	105	elif [ "$LVMTOOLSVERSION" = "1" ]; then
b02a6b13 ER	106	find_module "-lvm"
b02a6b13 ER	107	find_module "-lvm-mod"
67aa84bd	108	else
f0ef5219	109	die "LVM version $LVMTOOLSVERSION is not supported."
67aa84bd ER	110	fi
	111
	112	debug "LVM v$LVMTOOLSVERSION enabled"
	113	have_lvm=yes
	114	}
	115
	116
	117	# generate initrd fragment for lvm
	118	# @access public
	119	initrd_gen_lvm() {
	120	debug "Adding LVM support to initrd"
	121	inst_d /tmp /newroot
684d5d2a	122	inst_exec $lvm /bin/lvm.static
67aa84bd ER	123
	124	# always make /dev on tmpfs for LVM2
	125	if [ "$LVMTOOLSVERSION" = "2" ]; then
	126	mount_dev
	127	fi
	128
	129	if ! is_yes "$dev_mounted"; then
	130	inst_d /dev/mapper
	131	mknod $DESTDIR/dev/mapper/control c 10 63
	132	for device in $PVDEVICES; do
	133	# if LVM on RAID then device might be copied already in gen_md
	134	[ -e "$DESTDIR/dev/$(basename $device)" ] && continue
	135	inst $device /dev
	136	done
	137	fi
	138
	139	mount_tmp
7170bd62	140	mount_sys
67aa84bd ER	141	if [ "$LVMTOOLSVERSION" = "1" ]; then
	142	add_linuxrc <<-EOF
	143	lvm vgscan -T
	144	for vg in $VGVOLUMES; do
	145	lvm vgchange -T -a y $vg
	146	done
	147	EOF
	148	else
	149	echo "cat /etc/lvm.conf > /tmp/lvm.conf" \| add_linuxrc
	150	echo "global {" > "$DESTDIR/etc/lvm.conf"
	151	echo " locking_type = 0" >> "$DESTDIR/etc/lvm.conf"
	152	echo " locking_dir = \"/tmp\"" >> "$DESTDIR/etc/lvm.conf"
	153	echo "}" >> "$DESTDIR/etc/lvm.conf"
	154	echo "devices {" >> "$DESTDIR/etc/lvm.conf"
	155	echo " sysfs_scan=0" >> "$DESTDIR/etc/lvm.conf"
	156	if is_yes "$have_md"; then
	157	echo " md_component_detection = 1" >> "$DESTDIR/etc/lvm.conf"
	158	fi
	159	if is_yes "$have_dmraid" \|\| is_yes "$have_multipath"; then
	160	echo ' types = [ "device-mapper", 254 ]' >> "$DESTDIR/etc/lvm.conf"
	161	fi
	162	if [ "$lvm_ignore_devices" ]; then
	163	# TODO: think of merging with lvm dumpconfig output
	164	echo ' filter = [' >> "$DESTDIR/etc/lvm.conf"
	165	local dev
	166	for dev in $lvm_ignore_devices; do
	167	debug "LVM v2: ignore device $dev"
	168	printf ' "r\|^%s.*\|",\n' $dev
	169	done >> "$DESTDIR/etc/lvm.conf"
	170	echo ']' >> "$DESTDIR/etc/lvm.conf"
	171	fi
	172	# XXX filter= must be on one line!
728b5283	173	$lvm dumpconfig \| awk '/filter=/' >> "$DESTDIR/etc/lvm.conf"
67aa84bd ER	174	echo "}" >> "$DESTDIR/etc/lvm.conf"
	175
	176	initrd_gen_devices
	177
	178	add_linuxrc <<-EOF
	179	export ROOTDEV=$rootdev
	180	export ROOTVG="$VGVOLUMES"
	181	export SUSPENDVG=$SUSPENDVG
	182	EOF
	183	add_linuxrc <<-'EOF'
	184	# parse rootdev from kernel commandline if it begins with /
	185	case "$ROOT" in
	186	/*)
2ade15a8 ER	187
	188	# rewrite /dev/mapper/sys-rootfs -> /dev/sys/rootfs
	189	case "$ROOT" in
	190	/dev/mapper/-)
	191	ROOT=${ROOT#/dev/mapper/}
	192	local VG=${ROOT%%-*}
	193	local LV=${ROOT#*-}
	194	ROOT=/dev/$VG/$LV
	195	;;
	196	esac
	197
67aa84bd ER	198	if [ "$ROOT" != "$ROOTDEV" ]; then
67aa84bd ER	199	ROOTDEV=$ROOT
2ade15a8	200
67aa84bd ER	201	echo "LVM: Using 'root=$ROOTDEV' from kernel commandline"
	202	local tmp=${ROOTDEV#/dev/}
	203	if [ "$tmp" != "$ROOTDEV" ]; then
	204	ROOTVG=${tmp%/*}
	205	echo "LVM: Using Volume Group '$ROOTVG' for rootfs"
	206	fi
	207	fi
	208	;;
	209	esac
	210
	211	# skip duplicate VG
	212	if [ "$SUSPENDVG" = "$ROOTVG" ]; then
	213	export VGVOLUMES="$ROOTVG"
	214	else
	215	export VGVOLUMES="$SUSPENDVG $ROOTVG"
	216	fi
	217
	218	# disable noise from LVM accessing devices that aren't ready.
	219	read printk < /proc/sys/kernel/printk
	220	if [ ! "$DEBUGINITRD" ]; then
	221	echo 0 > /proc/sys/kernel/printk
	222	fi
	223
	224	export LVM_SYSTEM_DIR=/tmp
	225	: 'Scanning for Volume Groups'
	226	lvm.static vgscan --mknodes --ignorelockingfailure 2>/dev/null
	227
	228	: 'Activating Volume Groups'
	229	for vol in $VGVOLUMES; do
	230	lvm.static vgchange --ignorelockingfailure -a y $vol 2>/dev/null
	231	done
	232
	233	echo "$printk" > /proc/sys/kernel/printk
	234
	235	# Find out major/minor
	236	attrs="$(lvm.static lvdisplay --ignorelockingfailure -c $ROOTDEV 2>/dev/null)"
	237	if [ "$attrs" ]; then
	238	majmin="${attrs#$ROOTDEV:::::::::::*}"
	239	if [ "$majmin" != "$attrs" ]; then
	240	major="${majmin%:*}"
	241	minor="${majmin#*:}"
	242	fi
	243	fi
	244
	245	if [ "$major" -a "$minor" ]; then
	246	# Pass it to kernel
	247	echo $((256 * $major + $minor)) > /proc/sys/kernel/real-root-dev
	248	else
	249	echo 2>&1 "Error figuring out real root device for $ROOTDEV!"
	250	echo 2>&1 "System will not most likely boot up! So dropping you to a shell!"
	251	echo 2>&1 ""
	252	sh
	253	fi
	254	EOF
	255	fi
	256	}
	257
	258
	259	# PRIVATE METHODS
	260
	261	# find PV names from given VG name
	262	# @param string $vg Volume Group name
	263	# @access private
	264	find_lvm_pv() {
265	local vg="$1"
266
728b5283	267	local pv=$($lvm vgs --noheadings -o pv_name "$vg")
67aa84bd ER	268	echo $pv
	269	}
	270
	271	# find VG name from given devnode
	272	# @param string $devnode device node to be examined
	273	# @access private
	274	find_lvm_vg() {
	275	local devnode="$1"
	276
728b5283	277	local vg=$($lvm lvs --noheadings -o vg_name "$devnode")
67aa84bd ER	278	echo $vg
67aa84bd ER	279	}