[mirror_zfs-debian.git] / cmd / vdev_id / vdev_id

#!/bin/sh
#
# vdev_id: udev helper to generate user-friendly names for JBOD disks
#
# This script parses the file /etc/zfs/vdev_id.conf to map a
# physical path in a storage topology to a channel name.  The
# channel name is combined with a disk enclosure slot number to
# create an alias that reflects the physical location of the drive.
# This is particularly helpful when it comes to tasks like replacing
# failed drives.  Slot numbers may also be re-mapped in case the
# default numbering is unsatisfactory.  The drive aliases will be
# created as symbolic links in /dev/disk/by-vdev.
#
# The currently supported topologies are sas_direct and sas_switch.
# A multipath mode is supported in which dm-mpath devices are
# handled by examining the first-listed running component disk.  In
# multipath mode the configuration file should contain a channel
# definition with the same name for each path to a given enclosure.
#
# The alias keyword provides a simple way to map already-existing
# device symlinks to more convenient names.  It is suitable for
# small, static configurations or for sites that have some automated
# way to generate the mapping file.
#
#
# Some example configuration files are given below.

# #
# # Example vdev_id.conf - sas_direct.
# #
#
# multipath     no
# topology      sas_direct
# phys_per_port 4
# slot          bay
#
# #       PCI_ID  HBA PORT  CHANNEL NAME
# channel 85:00.0 1         A
# channel 85:00.0 0         B
# channel 86:00.0 1         C
# channel 86:00.0 0         D
#
# # Custom mapping for Channel A
#
# #    Linux      Mapped
# #    Slot       Slot      Channel
# slot 1          7         A
# slot 2          10        A
# slot 3          3         A
# slot 4          6         A
#
# # Default mapping for B, C, and D
# slot 1          4
# slot 2          2
# slot 3          1
# slot 4          3

# #
# # Example vdev_id.conf - sas_switch
# #
#
# topology      sas_switch
#
# #       SWITCH PORT  CHANNEL NAME
# channel 1            A
# channel 2            B
# channel 3            C
# channel 4            D

# #
# # Example vdev_id.conf - multipath
# #
#
# multipath yes
#
# #       PCI_ID  HBA PORT  CHANNEL NAME
# channel 85:00.0 1         A
# channel 85:00.0 0         B
# channel 86:00.0 1         A
# channel 86:00.0 0         B

# #
# # Example vdev_id.conf - alias
# #
#
# #     by-vdev
# #     name     fully qualified or base name of device link
# alias d1       /dev/disk/by-id/wwn-0x5000c5002de3b9ca
# alias d2       wwn-0x5000c5002def789e

PATH=/bin:/sbin:/usr/bin:/usr/sbin
CONFIG=/etc/zfs/vdev_id.conf
PHYS_PER_PORT=
DEV=
MULTIPATH=
TOPOLOGY=
BAY=

usage() {
	cat << EOF
Usage: vdev_id [-h]
       vdev_id <-d device> [-c config_file] [-p phys_per_port]
               [-g sas_direct|sas_switch] [-m]

  -c    specify name of alernate config file [default=$CONFIG]
  -d    specify basename of device (i.e. sda)
  -g    Storage network topology [default="$TOPOLOGY"]
  -m    Run in multipath mode
  -p    number of phy's per switch port [default=$PHYS_PER_PORT]
  -h    show this summary
EOF
	exit 0
}

map_slot() {
	local LINUX_SLOT=$1
	local CHANNEL=$2
	local MAPPED_SLOT=

	MAPPED_SLOT=`awk "\\$1 == \"slot\" && \\$2 == ${LINUX_SLOT} && \
			\\$4 ~ /^${CHANNEL}$|^$/ { print \\$3; exit }" $CONFIG`
	if [ -z "$MAPPED_SLOT" ] ; then
		MAPPED_SLOT=$LINUX_SLOT
	fi
	printf "%d" ${MAPPED_SLOT}
}

map_channel() {
	local MAPPED_CHAN=
	local PCI_ID=$1
	local PORT=$2

	case $TOPOLOGY in
		"sas_switch")
		MAPPED_CHAN=`awk "\\$1 == \"channel\" && \\$2 == ${PORT} \
			{ print \\$3; exit }" $CONFIG`
		;;
		"sas_direct")
		MAPPED_CHAN=`awk "\\$1 == \"channel\" && \
			\\$2 == \"${PCI_ID}\" && \\$3 == ${PORT} \
			{ print \\$4; exit }" $CONFIG`
		;;
	esac
	printf "%s" ${MAPPED_CHAN}
}

sas_handler() {
	if [ -z "$PHYS_PER_PORT" ] ; then
		PHYS_PER_PORT=`awk "\\$1 == \"phys_per_port\" \
			{print \\$2; exit}" $CONFIG`
	fi
	PHYS_PER_PORT=${PHYS_PER_PORT:-4}
	if ! echo $PHYS_PER_PORT | grep -q -E '^[0-9]+$' ; then
		echo "Error: phys_per_port value $PHYS_PER_PORT is non-numeric"
		exit 1
	fi

	if [ -z "$MULTIPATH_MODE" ] ; then
		MULTIPATH_MODE=`awk "\\$1 == \"multipath\" \
			{print \\$2; exit}" $CONFIG`
	fi

	# Use first running component device if we're handling a dm-mpath device
	if [ "$MULTIPATH_MODE" = "yes" ] ; then
		# If udev didn't tell us the UUID via DM_NAME, check /dev/mapper
		if [ -z "$DM_NAME" ] ; then
			DM_NAME=`ls -l --full-time /dev/mapper |
				awk "/\/$DEV$/{print \\$9}"`
		fi

		# For raw disks udev exports DEVTYPE=partition when
		# handling partitions, and the rules can be written to
		# take advantage of this to append a -part suffix.  For
		# dm devices we get DEVTYPE=disk even for partitions so
		# we have to append the -part suffix directly in the
		# helper.
		if [ "$DEVTYPE" != "partition" ] ; then
			PART=`echo $DM_NAME | awk -Fp '/p/{print "-part"$2}'`
		fi

		# Strip off partition information.
		DM_NAME=`echo $DM_NAME | sed 's/p[0-9][0-9]*$//'`
		if [ -z "$DM_NAME" ] ; then
			return
		fi

		# Get the raw scsi device name from multipath -l.  Strip off
		# leading pipe symbols to make field numbering consistent.
		DEV=`multipath -l $DM_NAME |
			awk '/running/{gsub("^[|]"," "); print $3 ; exit}'`
		if [ -z "$DEV" ] ; then
			return
		fi
	fi

	if echo $DEV | grep -q ^/devices/ ; then
		sys_path=$DEV
	else
		sys_path=`udevadm info -q path -p /sys/block/$DEV 2>/dev/null`
	fi

	# Use positional parameters as an ad-hoc array
	set -- $(echo "$sys_path" | tr / ' ')
	num_dirs=$#
	scsi_host_dir="/sys"

	# Get path up to /sys/.../hostX
	i=1
	while [ $i -le $num_dirs ] ; do
		d=$(eval echo \${$i})
		scsi_host_dir="$scsi_host_dir/$d"
		echo $d | grep -q -E '^host[0-9]+$' && break
		i=$(($i + 1))
	done

	if [ $i = $num_dirs ] ; then
		return
	fi

	PCI_ID=$(eval echo \${$(($i -1))} | awk -F: '{print $2":"$3}')

	# In sas_switch mode, the directory four levels beneath
	# /sys/.../hostX contains symlinks to phy devices that reveal
	# the switch port number.  In sas_direct mode, the phy links one
	# directory down reveal the HBA port.
	port_dir=$scsi_host_dir
	case $TOPOLOGY in
		"sas_switch") j=$(($i + 4)) ;;
		"sas_direct") j=$(($i + 1)) ;;
	esac

	i=$(($i + 1))
	while [ $i -le $j ] ; do
		port_dir="$port_dir/$(eval echo \${$i})"
		i=$(($i + 1))
	done

	PHY=`ls -d $port_dir/phy* 2>/dev/null | head -1 | awk -F: '{print $NF}'`
	if [ -z "$PHY" ] ; then
		return
	fi
	PORT=$(( $PHY / $PHYS_PER_PORT ))

	# Look in /sys/.../sas_device/end_device-X for the bay_identifier
	# attribute.
	end_device_dir=$port_dir
	while [ $i -lt $num_dirs ] ; do
		d=$(eval echo \${$i})
		end_device_dir="$end_device_dir/$d"
		if echo $d | grep -q '^end_device' ; then
			end_device_dir="$end_device_dir/sas_device/$d"
			break
		fi
		i=$(($i + 1))
	done

	SLOT=
	case $BAY in
	"bay")
		SLOT=`cat $end_device_dir/bay_identifier 2>/dev/null`
		;;
	"phy")
		SLOT=`cat $end_device_dir/phy_identifier 2>/dev/null`
		;;
	"id")
		i=$(($i + 1))
		d=$(eval echo \${$i})
		SLOT=`echo $d | sed -e 's/^.*://'`
		;;
	"lun")
		i=$(($i + 2))
		d=$(eval echo \${$i})
		SLOT=`echo $d | sed -e 's/^.*://'`
		;;
	esac
	if [ -z "$SLOT" ] ; then
		return
	fi

	CHAN=`map_channel $PCI_ID $PORT`
	SLOT=`map_slot $SLOT $CHAN`
	if [ -z "$CHAN" ] ; then
		return
	fi
	echo ${CHAN}${SLOT}${PART}
}

alias_handler () {
	# Special handling is needed to correctly append a -part suffix
	# to partitions of device mapper devices.  The DEVTYPE attribute
	# is normally set to "disk" instead of "partition" in this case,
	# so the udev rules won't handle that for us as they do for
	# "plain" block devices.
	#
	# For example, we may have the following links for a device and its
	# partitions,
	#
	#  /dev/disk/by-id/dm-name-isw_dibgbfcije_ARRAY0   -> ../../dm-0
	#  /dev/disk/by-id/dm-name-isw_dibgbfcije_ARRAY0p1 -> ../../dm-1
	#  /dev/disk/by-id/dm-name-isw_dibgbfcije_ARRAY0p2 -> ../../dm-3
	#
	# and the following alias in vdev_id.conf.
	#
	#   alias A0 dm-name-isw_dibgbfcije_ARRAY0
	#
	# The desired outcome is for the following links to be created
	# without having explicitly defined aliases for the partitions.
	#
	#  /dev/disk/by-vdev/A0       -> ../../dm-0
	#  /dev/disk/by-vdev/A0-part1 -> ../../dm-1
	#  /dev/disk/by-vdev/A0-part2 -> ../../dm-3
	#
	# Warning: The following grep pattern will misidentify whole-disk
	#          devices whose names end with 'p' followed by a string of
	#          digits as partitions, causing alias creation to fail. This
	#          ambiguity seems unavoidable, so devices using this facility
	#          must not use such names.
	local DM_PART=
	if echo $DM_NAME | grep -q -E 'p[0-9][0-9]*$' ; then
		if [ "$DEVTYPE" != "partition" ] ; then
			DM_PART=`echo $DM_NAME | awk -Fp '/p/{print "-part"$2}'`
		fi
	fi

	# DEVLINKS attribute must have been populated by already-run udev rules.
	for link in $DEVLINKS ; do
		# Remove partition information to match key of top-level device.
		if [ -n "$DM_PART" ] ; then
			link=`echo $link | sed 's/p[0-9][0-9]*$//'`
		fi
		# Check both the fully qualified and the base name of link.
		for l in $link `basename $link` ; do
			alias=`awk "\\$1 == \"alias\" && \\$3 == \"${l}\" \
					{ print \\$2; exit }" $CONFIG`
			if [ -n "$alias" ] ; then
				echo ${alias}${DM_PART}
				return
			fi
		done
	done
}

while getopts 'c:d:g:mp:h' OPTION; do
	case ${OPTION} in
	c)
		CONFIG=${OPTARG}
		;;
	d)
		DEV=${OPTARG}
		;;
	g)
		TOPOLOGY=$OPTARG
		;;
	p)
		PHYS_PER_PORT=${OPTARG}
		;;
	m)
		MULTIPATH_MODE=yes
		;;
	h)
		usage
		;;
	esac
done

if [ ! -r $CONFIG ] ; then
	exit 0
fi

if [ -z "$DEV" ] ; then
	echo "Error: missing required option -d"
	exit 1
fi

if [ -z "$TOPOLOGY" ] ; then
	TOPOLOGY=`awk "\\$1 == \"topology\" {print \\$2; exit}" $CONFIG`
fi

if [ -z "$BAY" ] ; then
	BAY=`awk "\\$1 == \"slot\" {print \\$2; exit}" $CONFIG`
fi

# First check if an alias was defined for this device.
ID_VDEV=`alias_handler`

if [ -z "$ID_VDEV" ] ; then
	BAY=${BAY:-bay}
	TOPOLOGY=${TOPOLOGY:-sas_direct}
	case $TOPOLOGY in
		sas_direct|sas_switch)
			ID_VDEV=`sas_handler`
			;;
		*)
			echo "Error: unknown topology $TOPOLOGY"
			exit 1
			;;
	esac
fi

if [ -n "$ID_VDEV" ] ; then
	echo "ID_VDEV=${ID_VDEV}"
	echo "ID_VDEV_PATH=disk/by-vdev/${ID_VDEV}"
fi
Commit	Line	Data
a6ef9522	1	#!/bin/sh
821b6834 NB	2	#
	3	# vdev_id: udev helper to generate user-friendly names for JBOD disks
	4	#
	5	# This script parses the file /etc/zfs/vdev_id.conf to map a
	6	# physical path in a storage topology to a channel name. The
	7	# channel name is combined with a disk enclosure slot number to
	8	# create an alias that reflects the physical location of the drive.
	9	# This is particularly helpful when it comes to tasks like replacing
	10	# failed drives. Slot numbers may also be re-mapped in case the
	11	# default numbering is unsatisfactory. The drive aliases will be
	12	# created as symbolic links in /dev/disk/by-vdev.
	13	#
2957f38d NB	14	# The currently supported topologies are sas_direct and sas_switch.
	15	# A multipath mode is supported in which dm-mpath devices are
	16	# handled by examining the first-listed running component disk. In
	17	# multipath mode the configuration file should contain a channel
	18	# definition with the same name for each path to a given enclosure.
	19	#
	20	# The alias keyword provides a simple way to map already-existing
	21	# device symlinks to more convenient names. It is suitable for
	22	# small, static configurations or for sites that have some automated
	23	# way to generate the mapping file.
	24	#
821b6834 NB	25	#
	26	# Some example configuration files are given below.
	27
	28	# #
	29	# # Example vdev_id.conf - sas_direct.
	30	# #
	31	#
	32	# multipath no
	33	# topology sas_direct
	34	# phys_per_port 4
e10b0808	35	# slot bay
821b6834 NB	36	#
	37	# # PCI_ID HBA PORT CHANNEL NAME
	38	# channel 85:00.0 1 A
	39	# channel 85:00.0 0 B
	40	# channel 86:00.0 1 C
	41	# channel 86:00.0 0 D
	42	#
a08ee875 LG	43	# # Custom mapping for Channel A
	44	#
	45	# # Linux Mapped
	46	# # Slot Slot Channel
	47	# slot 1 7 A
	48	# slot 2 10 A
	49	# slot 3 3 A
	50	# slot 4 6 A
	51	#
	52	# # Default mapping for B, C, and D
	53	# slot 1 4
	54	# slot 2 2
	55	# slot 3 1
	56	# slot 4 3
821b6834 NB	57
	58	# #
	59	# # Example vdev_id.conf - sas_switch
	60	# #
	61	#
	62	# topology sas_switch
	63	#
	64	# # SWITCH PORT CHANNEL NAME
	65	# channel 1 A
	66	# channel 2 B
	67	# channel 3 C
	68	# channel 4 D
	69
	70	# #
	71	# # Example vdev_id.conf - multipath
	72	# #
	73	#
	74	# multipath yes
	75	#
	76	# # PCI_ID HBA PORT CHANNEL NAME
	77	# channel 85:00.0 1 A
	78	# channel 85:00.0 0 B
	79	# channel 86:00.0 1 A
	80	# channel 86:00.0 0 B
	81
2957f38d NB	82	# #
	83	# # Example vdev_id.conf - alias
	84	# #
	85	#
	86	# # by-vdev
	87	# # name fully qualified or base name of device link
	88	# alias d1 /dev/disk/by-id/wwn-0x5000c5002de3b9ca
	89	# alias d2 wwn-0x5000c5002def789e
	90
821b6834 NB	91	PATH=/bin:/sbin:/usr/bin:/usr/sbin
	92	CONFIG=/etc/zfs/vdev_id.conf
	93	PHYS_PER_PORT=
	94	DEV=
821b6834 NB	95	MULTIPATH=
821b6834 NB	96	TOPOLOGY=
e10b0808	97	BAY=
821b6834 NB	98
	99	usage() {
	100	cat << EOF
	101	Usage: vdev_id [-h]
	102	vdev_id <-d device> [-c config_file] [-p phys_per_port]
	103	[-g sas_direct\|sas_switch] [-m]
	104
	105	-c specify name of alernate config file [default=$CONFIG]
	106	-d specify basename of device (i.e. sda)
	107	-g Storage network topology [default="$TOPOLOGY"]
	108	-m Run in multipath mode
	109	-p number of phy's per switch port [default=$PHYS_PER_PORT]
	110	-h show this summary
	111	EOF
	112	exit 0
	113	}
	114
	115	map_slot() {
	116	local LINUX_SLOT=$1
a08ee875	117	local CHANNEL=$2
821b6834 NB	118	local MAPPED_SLOT=
821b6834 NB	119
a08ee875	120	MAPPED_SLOT=`awk "\\$1 == \"slot\" && \\$2 == ${LINUX_SLOT} && \
ea04106b	121	\\$4 ~ /^${CHANNEL}$\|^$/ { print \\$3; exit }" $CONFIG`
821b6834 NB	122	if [ -z "$MAPPED_SLOT" ] ; then
	123	MAPPED_SLOT=$LINUX_SLOT
	124	fi
	125	printf "%d" ${MAPPED_SLOT}
	126	}
	127
	128	map_channel() {
	129	local MAPPED_CHAN=
	130	local PCI_ID=$1
	131	local PORT=$2
	132
	133	case $TOPOLOGY in
	134	"sas_switch")
ba43f456	135	MAPPED_CHAN=`awk "\\$1 == \"channel\" && \\$2 == ${PORT} \
821b6834 NB	136	{ print \\$3; exit }" $CONFIG`
	137	;;
	138	"sas_direct")
ba43f456 NB	139	MAPPED_CHAN=`awk "\\$1 == \"channel\" && \
	140	\\$2 == \"${PCI_ID}\" && \\$3 == ${PORT} \
	141	{ print \\$4; exit }" $CONFIG`
821b6834 NB	142	;;
	143	esac
	144	printf "%s" ${MAPPED_CHAN}
	145	}
	146
2957f38d NB	147	sas_handler() {
2957f38d NB	148	if [ -z "$PHYS_PER_PORT" ] ; then
ba43f456 NB	149	PHYS_PER_PORT=`awk "\\$1 == \"phys_per_port\" \
ba43f456 NB	150	{print \\$2; exit}" $CONFIG`
2957f38d NB	151	fi
	152	PHYS_PER_PORT=${PHYS_PER_PORT:-4}
	153	if ! echo $PHYS_PER_PORT \| grep -q -E '^[0-9]+$' ; then
	154	echo "Error: phys_per_port value $PHYS_PER_PORT is non-numeric"
	155	exit 1
	156	fi
	157
	158	if [ -z "$MULTIPATH_MODE" ] ; then
ba43f456 NB	159	MULTIPATH_MODE=`awk "\\$1 == \"multipath\" \
ba43f456 NB	160	{print \\$2; exit}" $CONFIG`
2957f38d NB	161	fi
	162
	163	# Use first running component device if we're handling a dm-mpath device
	164	if [ "$MULTIPATH_MODE" = "yes" ] ; then
	165	# If udev didn't tell us the UUID via DM_NAME, check /dev/mapper
	166	if [ -z "$DM_NAME" ] ; then
	167	DM_NAME=`ls -l --full-time /dev/mapper \|
	168	awk "/\/$DEV$/{print \\$9}"`
	169	fi
	170
	171	# For raw disks udev exports DEVTYPE=partition when
	172	# handling partitions, and the rules can be written to
	173	# take advantage of this to append a -part suffix. For
	174	# dm devices we get DEVTYPE=disk even for partitions so
	175	# we have to append the -part suffix directly in the
	176	# helper.
	177	if [ "$DEVTYPE" != "partition" ] ; then
	178	PART=`echo $DM_NAME \| awk -Fp '/p/{print "-part"$2}'`
	179	fi
	180
	181	# Strip off partition information.
	182	DM_NAME=`echo $DM_NAME \| sed 's/p[0-9][0-9]*$//'`
	183	if [ -z "$DM_NAME" ] ; then
	184	return
	185	fi
	186
a08ee875 LG	187	# Get the raw scsi device name from multipath -l. Strip off
	188	# leading pipe symbols to make field numbering consistent.
	189	DEV=`multipath -l $DM_NAME \|
	190	awk '/running/{gsub("^[\|]"," "); print $3 ; exit}'`
2957f38d NB	191	if [ -z "$DEV" ] ; then
	192	return
	193	fi
	194	fi
	195
	196	if echo $DEV \| grep -q ^/devices/ ; then
	197	sys_path=$DEV
	198	else
	199	sys_path=`udevadm info -q path -p /sys/block/$DEV 2>/dev/null`
	200	fi
	201
	202	# Use positional parameters as an ad-hoc array
	203	set -- $(echo "$sys_path" \| tr / ' ')
	204	num_dirs=$#
	205	scsi_host_dir="/sys"
	206
	207	# Get path up to /sys/.../hostX
	208	i=1
	209	while [ $i -le $num_dirs ] ; do
	210	d=$(eval echo \${$i})
	211	scsi_host_dir="$scsi_host_dir/$d"
	212	echo $d \| grep -q -E '^host[0-9]+$' && break
	213	i=$(($i + 1))
	214	done
	215
	216	if [ $i = $num_dirs ] ; then
	217	return
	218	fi
	219
	220	PCI_ID=$(eval echo \${$(($i -1))} \| awk -F: '{print $2":"$3}')
	221
	222	# In sas_switch mode, the directory four levels beneath
	223	# /sys/.../hostX contains symlinks to phy devices that reveal
	224	# the switch port number. In sas_direct mode, the phy links one
	225	# directory down reveal the HBA port.
	226	port_dir=$scsi_host_dir
	227	case $TOPOLOGY in
	228	"sas_switch") j=$(($i + 4)) ;;
	229	"sas_direct") j=$(($i + 1)) ;;
	230	esac
	231
	232	i=$(($i + 1))
	233	while [ $i -le $j ] ; do
	234	port_dir="$port_dir/$(eval echo \${$i})"
	235	i=$(($i + 1))
	236	done
	237
	238	PHY=`ls -d $port_dir/phy* 2>/dev/null \| head -1 \| awk -F: '{print $NF}'`
	239	if [ -z "$PHY" ] ; then
	240	return
	241	fi
	242	PORT=$(( $PHY / $PHYS_PER_PORT ))
	243
	244	# Look in /sys/.../sas_device/end_device-X for the bay_identifier
	245	# attribute.
	246	end_device_dir=$port_dir
	247	while [ $i -lt $num_dirs ] ; do
	248	d=$(eval echo \${$i})
	249	end_device_dir="$end_device_dir/$d"
	250	if echo $d \| grep -q '^end_device' ; then
	251	end_device_dir="$end_device_dir/sas_device/$d"
	252	break
	253	fi
	254	i=$(($i + 1))
255	done
256
e10b0808 AX	257	SLOT=
	258	case $BAY in
	259	"bay")
	260	SLOT=`cat $end_device_dir/bay_identifier 2>/dev/null`
	261	;;
	262	"phy")
	263	SLOT=`cat $end_device_dir/phy_identifier 2>/dev/null`
	264	;;
	265	"id")
	266	i=$(($i + 1))
	267	d=$(eval echo \${$i})
	268	SLOT=`echo $d \| sed -e 's/^.*://'`
	269	;;
	270	"lun")
	271	i=$(($i + 2))
	272	d=$(eval echo \${$i})
	273	SLOT=`echo $d \| sed -e 's/^.*://'`
	274	;;
	275	esac
2957f38d NB	276	if [ -z "$SLOT" ] ; then
	277	return
	278	fi
	279
2957f38d	280	CHAN=`map_channel $PCI_ID $PORT`
a08ee875	281	SLOT=`map_slot $SLOT $CHAN`
2957f38d NB	282	if [ -z "$CHAN" ] ; then
	283	return
	284	fi
	285	echo ${CHAN}${SLOT}${PART}
	286	}
	287
	288	alias_handler () {
	289	# Special handling is needed to correctly append a -part suffix
	290	# to partitions of device mapper devices. The DEVTYPE attribute
	291	# is normally set to "disk" instead of "partition" in this case,
	292	# so the udev rules won't handle that for us as they do for
	293	# "plain" block devices.
	294	#
	295	# For example, we may have the following links for a device and its
	296	# partitions,
	297	#
	298	# /dev/disk/by-id/dm-name-isw_dibgbfcije_ARRAY0 -> ../../dm-0
	299	# /dev/disk/by-id/dm-name-isw_dibgbfcije_ARRAY0p1 -> ../../dm-1
	300	# /dev/disk/by-id/dm-name-isw_dibgbfcije_ARRAY0p2 -> ../../dm-3
	301	#
	302	# and the following alias in vdev_id.conf.
	303	#
	304	# alias A0 dm-name-isw_dibgbfcije_ARRAY0
	305	#
	306	# The desired outcome is for the following links to be created
	307	# without having explicitly defined aliases for the partitions.
	308	#
	309	# /dev/disk/by-vdev/A0 -> ../../dm-0
	310	# /dev/disk/by-vdev/A0-part1 -> ../../dm-1
	311	# /dev/disk/by-vdev/A0-part2 -> ../../dm-3
	312	#
	313	# Warning: The following grep pattern will misidentify whole-disk
	314	# devices whose names end with 'p' followed by a string of
	315	# digits as partitions, causing alias creation to fail. This
	316	# ambiguity seems unavoidable, so devices using this facility
	317	# must not use such names.
	318	local DM_PART=
	319	if echo $DM_NAME \| grep -q -E 'p[0-9][0-9]*$' ; then
	320	if [ "$DEVTYPE" != "partition" ] ; then
	321	DM_PART=`echo $DM_NAME \| awk -Fp '/p/{print "-part"$2}'`
	322	fi
	323	fi
	324
	325	# DEVLINKS attribute must have been populated by already-run udev rules.
	326	for link in $DEVLINKS ; do
	327	# Remove partition information to match key of top-level device.
	328	if [ -n "$DM_PART" ] ; then
	329	link=`echo $link \| sed 's/p[0-9][0-9]*$//'`
	330	fi
	331	# Check both the fully qualified and the base name of link.
	332	for l in $link `basename $link` ; do
ba43f456	333	alias=`awk "\\$1 == \"alias\" && \\$3 == \"${l}\" \
2957f38d NB	334	{ print \\$2; exit }" $CONFIG`
	335	if [ -n "$alias" ] ; then
	336	echo ${alias}${DM_PART}
	337	return
	338	fi
	339	done
	340	done
	341	}
	342
	343	while getopts 'c:d:g:mp:h' OPTION; do
821b6834 NB	344	case ${OPTION} in
821b6834 NB	345	c)
2957f38d NB	346	CONFIG=${OPTARG}
2957f38d NB	347	;;
821b6834	348	d)
2957f38d NB	349	DEV=${OPTARG}
2957f38d NB	350	;;
821b6834 NB	351	g)
	352	TOPOLOGY=$OPTARG
	353	;;
	354	p)
	355	PHYS_PER_PORT=${OPTARG}
	356	;;
	357	m)
	358	MULTIPATH_MODE=yes
	359	;;
821b6834 NB	360	h)
	361	usage
	362	;;
	363	esac
	364	done
	365
	366	if [ ! -r $CONFIG ] ; then
	367	exit 0
	368	fi
	369
	370	if [ -z "$DEV" ] ; then
	371	echo "Error: missing required option -d"
	372	exit 1
	373	fi
	374
	375	if [ -z "$TOPOLOGY" ] ; then
ba43f456	376	TOPOLOGY=`awk "\\$1 == \"topology\" {print \\$2; exit}" $CONFIG`
821b6834	377	fi
a6ef9522	378
e10b0808 AX	379	if [ -z "$BAY" ] ; then
	380	BAY=`awk "\\$1 == \"slot\" {print \\$2; exit}" $CONFIG`
	381	fi
	382
2957f38d NB	383	# First check if an alias was defined for this device.
2957f38d NB	384	ID_VDEV=`alias_handler`
821b6834	385
2957f38d	386	if [ -z "$ID_VDEV" ] ; then
e10b0808	387	BAY=${BAY:-bay}
2957f38d NB	388	TOPOLOGY=${TOPOLOGY:-sas_direct}
	389	case $TOPOLOGY in
	390	sas_direct\|sas_switch)
	391	ID_VDEV=`sas_handler`
	392	;;
	393	*)
	394	echo "Error: unknown topology $TOPOLOGY"
	395	exit 1
	396	;;
	397	esac
821b6834 NB	398	fi
821b6834 NB	399
2957f38d NB	400	if [ -n "$ID_VDEV" ] ; then
	401	echo "ID_VDEV=${ID_VDEV}"
	402	echo "ID_VDEV_PATH=disk/by-vdev/${ID_VDEV}"
821b6834	403	fi