[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
LVM_ROOTVG=""

# VG for suspend resume dev
LVM_SUSPENDVG=""

LVM_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 [ $rc -gt 127 ]; then
		# lvdisplay terminated by signal! most likely it segfaulted.
		die "Unexpected exit from '$lvm 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"

	verbose "LVM: $devpath is LVM node"

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

	local pv=$(find_lvm_pv "$vg")
	verbose "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

	verbose "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

	verbose "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 -m 600 $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_sys
	if [ "$LVMTOOLSVERSION" = "1" ]; then
		add_linuxrc <<-EOF
			lvm vgscan -T
			for vg in $LVM_VGVOLUMES; do
				lvm vgchange -T -a y $vg
			done
		EOF
	else
		cat <<-EOF > "$DESTDIR/etc/lvm.conf"
		global {
			locking_type = 0
			locking_dir = "/tmp"
		}
		devices {
			sysfs_scan=0
		EOF
		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
				verbose "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"

		echo "cat /etc/lvm.conf > /tmp/lvm.conf" | add_linuxrc

		initrd_gen_devices

		add_linuxrc <<-EOF
			ROOTDEV=$rootdev
			LVM_ROOTVG="$LVM_VGVOLUMES"
			LVM_SUSPENDVG="$LVM_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
						LVM_ROOTVG=${tmp%/*}
						echo "LVM: Using Volume Group '$LVM_ROOTVG' for rootfs"
					fi
				fi
				;;
			esac

			# skip duplicate VG
			if [ "$LVM_SUSPENDVG" = "$LVM_ROOTVG" ]; then
				LVM_VGVOLUMES="$LVM_ROOTVG"
			else
				LVM_VGVOLUMES="$LVM_SUSPENDVG $LVM_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

			: 'Activating Volume Groups'
			for vol in $LVM_VGVOLUMES; do
				lvm.static vgchange --ignorelockingfailure -a y $vol --noudevsync
			done

			: 'Extra call to make device nodes for non lvm2-initrd (dynamic lvm2)'
			lvm.static vgmknodes --ignorelockingfailure

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

			# Find out major/minor
			attrs="$(lvm.static lvdisplay --ignorelockingfailure -c $ROOTDEV)"
			if [ "$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

			debugshell
			unset LVM_SYSTEM_DIR
		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 $vg
}
Commit	Line	Data
67aa84bd	1	#!/bin/sh
67aa84bd	2	# geninitrd mod: LVM
6e49b0b1	3	USE_LVM=${USE_LVM:-yes}
67aa84bd ER	4
	5	# if we should init LVM at boot
	6	have_lvm=no
	7
	8	# LVM volumes that are needed to activate
	9	# VG for root dev
	10	# @internal
00afc695	11	LVM_ROOTVG=""
67aa84bd ER	12
67aa84bd ER	13	# VG for suspend resume dev
00afc695	14	LVM_SUSPENDVG=""
67aa84bd	15
00afc695	16	LVM_VGVOLUMES=""
67aa84bd	17
f0ef5219 ER	18	# LVM version. Autodetected if not set.
	19	# Values: 1\|2
	20	LVMTOOLSVERSION=
	21
67aa84bd ER	22	# LVM devices that should not be included in vgscan on initrd.
	23	# @internal
	24	lvm_ignore_devices=''
	25
c124d0cf ER	26	# setup geninitrd module
	27	# @access public
	28	setup_mod_lvm() {
	29	lvm=$(find_tool $initrd_dir/lvm /sbin/initrd-lvm)
c124d0cf	30
728b5283	31	if [ ! -x "$lvm" ]; then
6e49b0b1 ER	32	USE_LVM=no
	33	fi
	34
	35	if is_yes "$USE_LVM" && [ -z "$LVMTOOLSVERSION" ]; then
	36	LVMTOOLSVERSION=$(LC_ALL=C $lvm vgchange --version 2>/dev/null \| awk '/LVM version:/{if ($3 >= 2) print "2"}')
c124d0cf	37	if [ -z "$LVMTOOLSVERSION" ]; then
074b295e	38	die "Can't determine LVM tools version (is /sys mounted?). Please set LVMTOOLSVERSION and rerun $PROGRAM."
c124d0cf ER	39	fi
	40	fi
	41	}
	42
67aa84bd ER	43	# return true if node is lvm node
	44	# @param string $node device node to be examined
	45	# @access public
	46	is_lvm() {
	47	local node="$1"
	48
	49	# LVM not wanted
	50	if is_no "$USE_LVM"; then
	51	return 1
	52	fi
	53
	54	if [ ! -e "$node" ]; then
	55	die "check_lvm(): node $node doesn't exist!"
	56	return 1
	57	fi
	58
	59	# block-major-58 is lvm1
	60	ls -lL "$node" 2> /dev/null \| awk '{if (/^b/) { if ($5 == "58,") { exit 0; } else { exit 1; } } else { exit 1; }}'
	61	rc=$?
	62
	63	if [ $rc = 0 ]; then
	64	# is lvm1
	65	return 0
	66	fi
	67
728b5283	68	$lvm lvdisplay "$node" > /dev/null 2>&1
67aa84bd ER	69	rc=$?
	70	if [ $rc -gt 127 ]; then
	71	# lvdisplay terminated by signal! most likely it segfaulted.
cf954091	72	die "Unexpected exit from '$lvm lvdisplay $node': $rc - are your lvm tools broken?"
67aa84bd ER	73	fi
	74
	75	return $rc
	76	}
	77
	78	# find modules for $devpath
	79	# @param $devpath device to be examined
	80	# @access public
	81	find_modules_lvm() {
	82	local devpath="$1"
	83
02ba8ab7	84	verbose "LVM: $devpath is LVM node"
67aa84bd	85
67aa84bd	86	local vg=$(find_lvm_vg "$devpath")
02ba8ab7	87	verbose "LVM VG for $devpath: $vg"
00afc695	88	LVM_VGVOLUMES=$(echo $LVM_VGVOLUMES $vg \| tr ' ' '\n' \| sort -u)
67aa84bd ER	89
67aa84bd ER	90	local pv=$(find_lvm_pv "$vg")
02ba8ab7	91	verbose "LVM PV for $vg: $pv"
67aa84bd ER	92	PVDEVICES=$(echo $PVDEVICES $pv \| tr ' ' '\n' \| sort -u)
	93
	94	if [ -n "$PVDEVICES" ]; then
	95	for device in $PVDEVICES; do
	96	find_modules_for_devpath $device
	97	done
	98	else
728b5283	99	die "I wasn't able to find PV. You can try to set PVDEVICES in /etc/sysconfig/geninitrd."
67aa84bd ER	100	fi
	101
	102	if [ "$LVMTOOLSVERSION" = "2" ]; then
b02a6b13	103	find_module "-dm-mod"
67aa84bd	104	elif [ "$LVMTOOLSVERSION" = "1" ]; then
b02a6b13 ER	105	find_module "-lvm"
b02a6b13 ER	106	find_module "-lvm-mod"
67aa84bd	107	else
f0ef5219	108	die "LVM version $LVMTOOLSVERSION is not supported."
67aa84bd ER	109	fi
67aa84bd ER	110
02ba8ab7	111	verbose "LVM v$LVMTOOLSVERSION enabled"
67aa84bd ER	112	have_lvm=yes
	113	}
	114
	115
	116	# generate initrd fragment for lvm
	117	# @access public
	118	initrd_gen_lvm() {
1b481849 ER	119	if ! is_yes "$have_lvm"; then
	120	return
	121	fi
	122
02ba8ab7	123	verbose "Adding LVM support to initrd"
67aa84bd	124	inst_d /tmp /newroot
684d5d2a	125	inst_exec $lvm /bin/lvm.static
67aa84bd ER	126
	127	# always make /dev on tmpfs for LVM2
	128	if [ "$LVMTOOLSVERSION" = "2" ]; then
	129	mount_dev
	130	fi
	131
	132	if ! is_yes "$dev_mounted"; then
	133	inst_d /dev/mapper
6b45dd6c	134	mknod -m 600 $DESTDIR/dev/mapper/control c 10 63
67aa84bd ER	135	for device in $PVDEVICES; do
	136	# if LVM on RAID then device might be copied already in gen_md
	137	[ -e "$DESTDIR/dev/$(basename $device)" ] && continue
	138	inst $device /dev
	139	done
	140	fi
	141
7170bd62	142	mount_sys
67aa84bd ER	143	if [ "$LVMTOOLSVERSION" = "1" ]; then
	144	add_linuxrc <<-EOF
	145	lvm vgscan -T
00afc695	146	for vg in $LVM_VGVOLUMES; do
67aa84bd ER	147	lvm vgchange -T -a y $vg
	148	done
	149	EOF
	150	else
432641fe ER	151	cat <<-EOF > "$DESTDIR/etc/lvm.conf"
	152	global {
	153	locking_type = 0
	154	locking_dir = "/tmp"
	155	}
	156	devices {
	157	sysfs_scan=0
	158	EOF
67aa84bd	159	if is_yes "$have_md"; then
432641fe	160	echo " md_component_detection=1" >> "$DESTDIR/etc/lvm.conf"
67aa84bd ER	161	fi
	162	if is_yes "$have_dmraid" \|\| is_yes "$have_multipath"; then
	163	echo ' types = [ "device-mapper", 254 ]' >> "$DESTDIR/etc/lvm.conf"
	164	fi
	165	if [ "$lvm_ignore_devices" ]; then
	166	# TODO: think of merging with lvm dumpconfig output
	167	echo ' filter = [' >> "$DESTDIR/etc/lvm.conf"
	168	local dev
	169	for dev in $lvm_ignore_devices; do
02ba8ab7	170	verbose "LVM v2: ignore device $dev"
67aa84bd ER	171	printf ' "r\|^%s.*\|",\n' $dev
	172	done >> "$DESTDIR/etc/lvm.conf"
	173	echo ']' >> "$DESTDIR/etc/lvm.conf"
	174	fi
	175	# XXX filter= must be on one line!
728b5283	176	$lvm dumpconfig \| awk '/filter=/' >> "$DESTDIR/etc/lvm.conf"
67aa84bd ER	177	echo "}" >> "$DESTDIR/etc/lvm.conf"
67aa84bd ER	178
432641fe ER	179	echo "cat /etc/lvm.conf > /tmp/lvm.conf" \| add_linuxrc
432641fe ER	180
67aa84bd ER	181	initrd_gen_devices
	182
	183	add_linuxrc <<-EOF
48d98595	184	ROOTDEV=$rootdev
00afc695 ER	185	LVM_ROOTVG="$LVM_VGVOLUMES"
00afc695 ER	186	LVM_SUSPENDVG="$LVM_SUSPENDVG"
67aa84bd	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" != "$ROOTDEV" ]; then
00afc695 ER	216	LVM_ROOTVG=${tmp%/*}
00afc695 ER	217	echo "LVM: Using Volume Group '$LVM_ROOTVG' for rootfs"
67aa84bd ER	218	fi
	219	fi
	220	;;
	221	esac
	222
	223	# skip duplicate VG
00afc695 ER	224	if [ "$LVM_SUSPENDVG" = "$LVM_ROOTVG" ]; then
00afc695 ER	225	LVM_VGVOLUMES="$LVM_ROOTVG"
67aa84bd	226	else
00afc695	227	LVM_VGVOLUMES="$LVM_SUSPENDVG $LVM_ROOTVG"
67aa84bd ER	228	fi
	229
	230	# disable noise from LVM accessing devices that aren't ready.
	231	read printk < /proc/sys/kernel/printk
	232	if [ ! "$DEBUGINITRD" ]; then
	233	echo 0 > /proc/sys/kernel/printk
	234	fi
	235
	236	export LVM_SYSTEM_DIR=/tmp
438d2161	237
67aa84bd	238	: 'Scanning for Volume Groups'
f87179eb	239	lvm.static vgscan --mknodes --ignorelockingfailure
67aa84bd ER	240
67aa84bd ER	241	: 'Activating Volume Groups'
00afc695	242	for vol in $LVM_VGVOLUMES; do
438d2161	243	lvm.static vgchange --ignorelockingfailure -a y $vol --noudevsync
67aa84bd ER	244	done
67aa84bd ER	245
eeb60f3f	246	: 'Extra call to make device nodes for non lvm2-initrd (dynamic lvm2)'
78c426d2 ER	247	lvm.static vgmknodes --ignorelockingfailure
78c426d2 ER	248
67aa84bd ER	249	echo "$printk" > /proc/sys/kernel/printk
	250
	251	# Find out major/minor
f87179eb	252	attrs="$(lvm.static lvdisplay --ignorelockingfailure -c $ROOTDEV)"
67aa84bd ER	253	if [ "$attrs" ]; then
	254	majmin="${attrs#$ROOTDEV:::::::::::*}"
	255	if [ "$majmin" != "$attrs" ]; then
	256	major="${majmin%:*}"
	257	minor="${majmin#*:}"
	258	fi
	259	fi
	260
	261	if [ "$major" -a "$minor" ]; then
	262	# Pass it to kernel
	263	echo $((256 * $major + $minor)) > /proc/sys/kernel/real-root-dev
67aa84bd	264	fi
48d98595	265
f87179eb	266	debugshell
48d98595	267	unset LVM_SYSTEM_DIR
67aa84bd ER	268	EOF
	269	fi
	270	}
	271
	272
	273	# PRIVATE METHODS
	274
	275	# find PV names from given VG name
	276	# @param string $vg Volume Group name
	277	# @access private
	278	find_lvm_pv() {
	279	local vg="$1"
	280
728b5283	281	local pv=$($lvm vgs --noheadings -o pv_name "$vg")
67aa84bd ER	282	echo $pv
	283	}
	284
	285	# find VG name from given devnode
	286	# @param string $devnode device node to be examined
	287	# @access private
	288	find_lvm_vg() {
	289	local devnode="$1"
	290
728b5283	291	local vg=$($lvm lvs --noheadings -o vg_name "$devnode")
67aa84bd ER	292	echo $vg
67aa84bd ER	293	}