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

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

# 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() {
	if ! is_yes "$have_lvm"; then
		return
	fi

	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

		# need awk for "s/--/-/g" subst when parsing kernel root commandline
		busybox_applet awk
		add_linuxrc <<-'EOF'
			# parse rootdev from kernel commandline if it begins with /
			case "$ROOT" in
				/*)

				# rewrite:
			 	# /dev/mapper/sys-rootfs -> /dev/sys/rootfs
				# /dev/mapper/blodnatt-blah--bleh -> /dev/blodnatt/blah-bleh
				# /dev/mapper/vg--meaw-root -> /dev/vg-meaw/root
				case "$ROOT" in
					/dev/mapper/*-*)
						# change "--" to / (as "/" is impossible in LV name)
						local dev=$(awk -vdev="${ROOT#/dev/mapper/}" 'BEGIN{gsub(/--/, "/", dev); print dev}')
						local VG=$(awk -vdev="$dev" 'BEGIN{split(dev, v, "-"); gsub("/", "-", v[1]); print v[1]}')
						local LV=$(awk -vdev="$dev" 'BEGIN{split(dev, v, "-"); gsub("/", "-", v[2]); print v[2]}')
						ROOT=/dev/$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
			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 $vg
}
Commit	Line	Data
67aa84bd	1	#!/bin/sh
c34c6a69	2	LVM_RCSID='$Revision$ $Date:: $'
05c474b5	3
67aa84bd	4	# geninitrd mod: LVM
6e49b0b1	5	USE_LVM=${USE_LVM:-yes}
67aa84bd ER	6
	7	# if we should init LVM at boot
	8	have_lvm=no
	9
	10	# LVM volumes that are needed to activate
	11	# VG for root dev
	12	# @internal
	13	ROOTVG=""
	14
	15	# VG for suspend resume dev
	16	SUSPENDVG=""
	17
	18	VGVOLUMES=""
	19
f0ef5219 ER	20	# LVM version. Autodetected if not set.
	21	# Values: 1\|2
	22	LVMTOOLSVERSION=
	23
67aa84bd ER	24	# LVM devices that should not be included in vgscan on initrd.
	25	# @internal
	26	lvm_ignore_devices=''
	27
c124d0cf ER	28	# setup geninitrd module
	29	# @access public
	30	setup_mod_lvm() {
	31	lvm=$(find_tool $initrd_dir/lvm /sbin/initrd-lvm)
c124d0cf	32
728b5283	33	if [ ! -x "$lvm" ]; then
6e49b0b1 ER	34	USE_LVM=no
	35	fi
	36
	37	if is_yes "$USE_LVM" && [ -z "$LVMTOOLSVERSION" ]; then
	38	LVMTOOLSVERSION=$(LC_ALL=C $lvm vgchange --version 2>/dev/null \| awk '/LVM version:/{if ($3 >= 2) print "2"}')
c124d0cf	39	if [ -z "$LVMTOOLSVERSION" ]; then
074b295e	40	die "Can't determine LVM tools version (is /sys mounted?). Please set LVMTOOLSVERSION and rerun $PROGRAM."
c124d0cf ER	41	fi
	42	fi
	43	}
	44
67aa84bd ER	45	# return true if node is lvm node
	46	# @param string $node device node to be examined
	47	# @access public
	48	is_lvm() {
	49	local node="$1"
	50
	51	# LVM not wanted
	52	if is_no "$USE_LVM"; then
	53	return 1
	54	fi
	55
	56	if [ ! -e "$node" ]; then
	57	die "check_lvm(): node $node doesn't exist!"
	58	return 1
	59	fi
	60
	61	# block-major-58 is lvm1
	62	ls -lL "$node" 2> /dev/null \| awk '{if (/^b/) { if ($5 == "58,") { exit 0; } else { exit 1; } } else { exit 1; }}'
	63	rc=$?
	64
	65	if [ $rc = 0 ]; then
	66	# is lvm1
	67	return 0
	68	fi
	69
728b5283	70	$lvm lvdisplay "$node" > /dev/null 2>&1
67aa84bd ER	71	rc=$?
	72	if [ $rc -gt 127 ]; then
	73	# lvdisplay terminated by signal! most likely it segfaulted.
	74	die "Unexpected exit from 'lvdisplay $node': $rc - are your lvm tools broken?"
	75	fi
	76
	77	return $rc
	78	}
	79
	80	# find modules for $devpath
	81	# @param $devpath device to be examined
	82	# @access public
	83	find_modules_lvm() {
	84	local devpath="$1"
	85
	86	debug "LVM: $devpath is LVM node"
	87
67aa84bd ER	88	local vg=$(find_lvm_vg "$devpath")
	89	debug "LVM VG for $devpath: $vg"
	90	VGVOLUMES=$(echo $VGVOLUMES $vg \| tr ' ' '\n' \| sort -u)
	91
	92	local pv=$(find_lvm_pv "$vg")
	93	debug "LVM PV for $vg: $pv"
	94	PVDEVICES=$(echo $PVDEVICES $pv \| tr ' ' '\n' \| sort -u)
	95
	96	if [ -n "$PVDEVICES" ]; then
	97	for device in $PVDEVICES; do
	98	find_modules_for_devpath $device
	99	done
	100	else
728b5283	101	die "I wasn't able to find PV. You can try to set PVDEVICES in /etc/sysconfig/geninitrd."
67aa84bd ER	102	fi
	103
	104	if [ "$LVMTOOLSVERSION" = "2" ]; then
b02a6b13	105	find_module "-dm-mod"
67aa84bd	106	elif [ "$LVMTOOLSVERSION" = "1" ]; then
b02a6b13 ER	107	find_module "-lvm"
b02a6b13 ER	108	find_module "-lvm-mod"
67aa84bd	109	else
f0ef5219	110	die "LVM version $LVMTOOLSVERSION is not supported."
67aa84bd ER	111	fi
	112
	113	debug "LVM v$LVMTOOLSVERSION enabled"
	114	have_lvm=yes
	115	}
	116
	117
	118	# generate initrd fragment for lvm
	119	# @access public
	120	initrd_gen_lvm() {
1b481849 ER	121	if ! is_yes "$have_lvm"; then
	122	return
	123	fi
	124
67aa84bd ER	125	debug "Adding LVM support to initrd"
67aa84bd ER	126	inst_d /tmp /newroot
684d5d2a	127	inst_exec $lvm /bin/lvm.static
67aa84bd ER	128
	129	# always make /dev on tmpfs for LVM2
	130	if [ "$LVMTOOLSVERSION" = "2" ]; then
	131	mount_dev
	132	fi
	133
	134	if ! is_yes "$dev_mounted"; then
	135	inst_d /dev/mapper
	136	mknod $DESTDIR/dev/mapper/control c 10 63
	137	for device in $PVDEVICES; do
	138	# if LVM on RAID then device might be copied already in gen_md
	139	[ -e "$DESTDIR/dev/$(basename $device)" ] && continue
	140	inst $device /dev
	141	done
	142	fi
	143
	144	mount_tmp
7170bd62	145	mount_sys
67aa84bd ER	146	if [ "$LVMTOOLSVERSION" = "1" ]; then
	147	add_linuxrc <<-EOF
	148	lvm vgscan -T
	149	for vg in $VGVOLUMES; do
	150	lvm vgchange -T -a y $vg
	151	done
	152	EOF
	153	else
	154	echo "cat /etc/lvm.conf > /tmp/lvm.conf" \| add_linuxrc
	155	echo "global {" > "$DESTDIR/etc/lvm.conf"
	156	echo " locking_type = 0" >> "$DESTDIR/etc/lvm.conf"
	157	echo " locking_dir = \"/tmp\"" >> "$DESTDIR/etc/lvm.conf"
	158	echo "}" >> "$DESTDIR/etc/lvm.conf"
	159	echo "devices {" >> "$DESTDIR/etc/lvm.conf"
	160	echo " sysfs_scan=0" >> "$DESTDIR/etc/lvm.conf"
	161	if is_yes "$have_md"; then
	162	echo " md_component_detection = 1" >> "$DESTDIR/etc/lvm.conf"
	163	fi
	164	if is_yes "$have_dmraid" \|\| is_yes "$have_multipath"; then
	165	echo ' types = [ "device-mapper", 254 ]' >> "$DESTDIR/etc/lvm.conf"
	166	fi
	167	if [ "$lvm_ignore_devices" ]; then
	168	# TODO: think of merging with lvm dumpconfig output
	169	echo ' filter = [' >> "$DESTDIR/etc/lvm.conf"
	170	local dev
	171	for dev in $lvm_ignore_devices; do
	172	debug "LVM v2: ignore device $dev"
	173	printf ' "r\|^%s.*\|",\n' $dev
	174	done >> "$DESTDIR/etc/lvm.conf"
	175	echo ']' >> "$DESTDIR/etc/lvm.conf"
	176	fi
	177	# XXX filter= must be on one line!
728b5283	178	$lvm dumpconfig \| awk '/filter=/' >> "$DESTDIR/etc/lvm.conf"
67aa84bd ER	179	echo "}" >> "$DESTDIR/etc/lvm.conf"
	180
	181	initrd_gen_devices
	182
	183	add_linuxrc <<-EOF
	184	export ROOTDEV=$rootdev
	185	export ROOTVG="$VGVOLUMES"
	186	export SUSPENDVG=$SUSPENDVG
	187	EOF
57f48d51 ER	188
	189	# need awk for "s/--/-/g" subst when parsing kernel root commandline
	190	busybox_applet awk
67aa84bd ER	191	add_linuxrc <<-'EOF'
	192	# parse rootdev from kernel commandline if it begins with /
	193	case "$ROOT" in
	194	/*)
2ade15a8	195
57f48d51	196	# rewrite:
ea8d931d	197	# /dev/mapper/sys-rootfs -> /dev/sys/rootfs
57f48d51	198	# /dev/mapper/blodnatt-blah--bleh -> /dev/blodnatt/blah-bleh
ea8d931d	199	# /dev/mapper/vg--meaw-root -> /dev/vg-meaw/root
2ade15a8 ER	200	case "$ROOT" in
2ade15a8 ER	201	/dev/mapper/-)
ea8d931d ER	202	# change "--" to / (as "/" is impossible in LV name)
	203	local dev=$(awk -vdev="${ROOT#/dev/mapper/}" 'BEGIN{gsub(/--/, "/", dev); print dev}')
	204	local VG=$(awk -vdev="$dev" 'BEGIN{split(dev, v, "-"); gsub("/", "-", v[1]); print v[1]}')
	205	local LV=$(awk -vdev="$dev" 'BEGIN{split(dev, v, "-"); gsub("/", "-", v[2]); print v[2]}')
2ade15a8 ER	206	ROOT=/dev/$VG/$LV
	207	;;
	208	esac
	209
67aa84bd ER	210	if [ "$ROOT" != "$ROOTDEV" ]; then
67aa84bd ER	211	ROOTDEV=$ROOT
2ade15a8	212
67aa84bd ER	213	echo "LVM: Using 'root=$ROOTDEV' from kernel commandline"
	214	local tmp=${ROOTDEV#/dev/}
	215	if [ "$tmp" != "$ROOTDEV" ]; then
	216	ROOTVG=${tmp%/*}
	217	echo "LVM: Using Volume Group '$ROOTVG' for rootfs"
	218	fi
	219	fi
	220	;;
	221	esac
	222
	223	# skip duplicate VG
	224	if [ "$SUSPENDVG" = "$ROOTVG" ]; then
	225	export VGVOLUMES="$ROOTVG"
	226	else
	227	export VGVOLUMES="$SUSPENDVG $ROOTVG"
	228	fi
	229
	230	# disable noise from LVM accessing devices that aren't ready.
	231	read printk < /proc/sys/kernel/printk
	232	if [ ! "$DEBUGINITRD" ]; then
	233	echo 0 > /proc/sys/kernel/printk
	234	fi
	235
	236	export LVM_SYSTEM_DIR=/tmp
	237	: 'Scanning for Volume Groups'
	238	lvm.static vgscan --mknodes --ignorelockingfailure 2>/dev/null
	239
	240	: 'Activating Volume Groups'
	241	for vol in $VGVOLUMES; do
	242	lvm.static vgchange --ignorelockingfailure -a y $vol 2>/dev/null
	243	done
	244
	245	echo "$printk" > /proc/sys/kernel/printk
	246
	247	# Find out major/minor
	248	attrs="$(lvm.static lvdisplay --ignorelockingfailure -c $ROOTDEV 2>/dev/null)"
	249	if [ "$attrs" ]; then
	250	majmin="${attrs#$ROOTDEV:::::::::::*}"
	251	if [ "$majmin" != "$attrs" ]; then
	252	major="${majmin%:*}"
	253	minor="${majmin#*:}"
	254	fi
	255	fi
	256
	257	if [ "$major" -a "$minor" ]; then
	258	# Pass it to kernel
	259	echo $((256 * $major + $minor)) > /proc/sys/kernel/real-root-dev
67aa84bd ER	260	fi
	261	EOF
	262	fi
	263	}
	264
	265
	266	# PRIVATE METHODS
	267
	268	# find PV names from given VG name
	269	# @param string $vg Volume Group name
	270	# @access private
	271	find_lvm_pv() {
	272	local vg="$1"
	273
728b5283	274	local pv=$($lvm vgs --noheadings -o pv_name "$vg")
67aa84bd ER	275	echo $pv
	276	}
	277
	278	# find VG name from given devnode
	279	# @param string $devnode device node to be examined
	280	# @access private
	281	find_lvm_vg() {
	282	local devnode="$1"
	283
728b5283	284	local vg=$($lvm lvs --noheadings -o vg_name "$devnode")
67aa84bd ER	285	echo $vg
67aa84bd ER	286	}