Add vdev_id for JBOD-friendly udev aliases

vdev_id 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 only currently supported topologies are sas_direct and sas_switch:

o  sas_direct - a channel is uniquely identified by a PCI slot and a
   HBA port

o  sas_switch - a channel is uniquely identified by a SAS switch port

A multipath mode is supported in which dm-mpath devices are handled by
examining the first running component disk, as reported by 'multipath
-l'.  In multipath mode the configuration file should contain a
channel definition with the same name for each path to a given
enclosure.

vdev_id can replace the existing zpool_id script on systems where the
storage topology conforms to sas_direct or sas_switch.  The script
could be extended to support other topologies as well.  The advantage
of vdev_id is that it is driven by a single static input file that can
be shared across multiple nodes having a common storage toplogy.
zpool_id, on the other hand, requires a unique /etc/zfs/zdev.conf per
node and a separate slot-mapping file.  However, zpool_id provides the
flexibility of using any device names that show up in
/dev/disk/by-path, so it may still be needed on some systems.

vdev_id's functionality subsumes that of the sas_switch_id script, and
it is unlikely that anyone is using it, so sas_switch_id is removed.

Finally, /dev/disk/by-vdev is added to the list of directories that
'zpool import' will scan.

Signed-off-by: Brian Behlendorf <[email protected]>
Closes #713

3 files changed, 834 insertions, 0 deletions

diff --git a/cmd/vdev_id/Makefile.am b/cmd/vdev_id/Makefile.am
new file mode 100644
index 000000000..fb815faad
--- /dev/null
+++ b/cmd/vdev_id/Makefile.am
@@ -0,0 +1 @@
+dist_udev_SCRIPTS = vdev_id
diff --git a/cmd/vdev_id/Makefile.in b/cmd/vdev_id/Makefile.in
new file mode 100644
index 000000000..8f3b4ae6a
--- /dev/null
+++ b/cmd/vdev_id/Makefile.in
@@ -0,0 +1,542 @@
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+	  install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	  `test -z '$(STRIP)' || \
+	    echo "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'"` install
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-am
+
+clean-am: clean-generic clean-libtool mostlyclean-am
+
+distclean: distclean-am
+	-rm -f Makefile
+distclean-am: clean-am distclean-generic
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
+
+info: info-am
+
+info-am:
+
+install-data-am: install-dist_udevSCRIPTS
+
+install-dvi: install-dvi-am
+
+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-generic mostlyclean-libtool
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am: uninstall-dist_udevSCRIPTS
+
+.MAKE: install-am install-strip
+
+.PHONY: all all-am check check-am clean clean-generic clean-libtool \
+	distclean distclean-generic distclean-libtool distdir dvi \
+	dvi-am html html-am info info-am install install-am \
+	install-data install-data-am install-dist_udevSCRIPTS \
+	install-dvi install-dvi-am install-exec install-exec-am \
+	install-html install-html-am install-info install-info-am \
+	install-man install-pdf install-pdf-am install-ps \
+	install-ps-am install-strip installcheck installcheck-am \
+	installdirs maintainer-clean maintainer-clean-generic \
+	mostlyclean mostlyclean-generic mostlyclean-libtool pdf pdf-am \
+	ps ps-am uninstall uninstall-am uninstall-dist_udevSCRIPTS
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/cmd/vdev_id/vdev_id b/cmd/vdev_id/vdev_id
new file mode 100755
index 000000000..d2781972f
--- /dev/null
+++ b/cmd/vdev_id/vdev_id
@@ -0,0 +1,291 @@
+#!/bin/bash
+#
+# 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 only 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.
+
+#
+# Some example configuration files are given below.
+
+# #
+# # Example vdev_id.conf - sas_direct.
+# #
+#
+# multipath     no
+# topology      sas_direct
+# phys_per_port 4
+#
+# #       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
+#
+# #    Linux	Mapped
+# #    Slot	Slot
+# slot 1        7
+# slot 2        10
+# slot 3        3
+# slot 4        6
+# slot 5        2
+# slot 6        8
+# slot 7        1
+# slot 8        4
+# slot 9        9
+# slot 10       5
+
+# #
+# # 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
+
+PATH=/bin:/sbin:/usr/bin:/usr/sbin
+CONFIG=/etc/zfs/vdev_id.conf
+PHYS_PER_PORT=
+DEV=
+SLOT_MAP=
+CHANNEL_MAP=
+MULTIPATH=
+TOPOLOGY=
+declare -i i j
+
+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 MAPPED_SLOT=
+
+	MAPPED_SLOT=`awk "/^slot / && \\$2 == ${LINUX_SLOT} \
+			{ 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 "/^channel / && \\$2 == ${PORT} \
+			{ print \\$3; exit }" $CONFIG`
+		;;
+		"sas_direct")
+		MAPPED_CHAN=`awk "/^channel / && \\$2 == \"${PCI_ID}\" && \
+				\\$3 == ${PORT} { print \\$4; exit }" \
+				$CONFIG`
+		;;
+	esac
+	printf "%s" ${MAPPED_CHAN}
+}
+
+while getopts 'c:s:d:g:mp:h' OPTION; do
+	case ${OPTION} in
+	c)
+		CONFIG=`readlink -e ${OPTARG}`
+	;;
+	d)
+	DEV=${OPTARG}
+	;;
+	g)
+		TOPOLOGY=$OPTARG
+		;;
+	p)
+		PHYS_PER_PORT=${OPTARG}
+		;;
+	m)
+		MULTIPATH_MODE=yes
+		;;
+	s)
+		SLOT_MAP=`readlink -e ${OPTARG}`
+		if [ ! -r $SLOT_MAP ] ; then
+			echo "Error: $SLOT_MAP is nonexistant or unreadable"
+			exit 1
+		fi
+		;;
+	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 "/^topology /{print \\$2; exit}" $CONFIG`
+fi
+TOPOLOGY=${TOPOLOGY:-sas_direct}
+case $TOPOLOGY in
+	sas_direct|sas_switch)
+		;;
+	*)
+		echo "Error: unknown topology $TOPOLOGY"
+		exit 1
+		;;
+esac
+
+if [ -z "$PHYS_PER_PORT" ] ; then
+	PHYS_PER_PORT=`awk "/^phys_per_port /{print \\$2; exit}" $CONFIG`
+fi
+PHYS_PER_PORT=${PHYS_PER_PORT:-4}
+if ! echo $PHYS_PER_PORT | egrep -q '^[0-9]+$' ; then
+	echo "Error: phys_per_port value $PHYS_PER_PORT is non-numeric"
+	exit 1
+fi
+
+if [ -z "$MULTIPATH_MODE" ] ; then
+	MULTIPATH_MODE=`awk "/^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, find it in /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
+		exit 0
+	fi
+
+	# Get the raw scsi device name from multipath -l.
+	DEV=`multipath -l $DM_NAME |awk '/running/{print $3 ; exit}'`
+	if [ -z "$DEV" ] ; then
+		exit 0
+	fi
+fi
+
+if echo $DEV | grep -q ^/devices/ ; then
+	sys_path=$DEV
+else
+	sys_path=`udevadm info -q path -p /sys/block/$DEV 2>/dev/null`
+fi
+
+dirs=(`echo "$sys_path" | tr / ' '`)
+scsi_host_dir="/sys"
+
+# Get path up to /sys/.../hostX
+for (( i=0; i<${#dirs[*]}; i++ )); do
+	d=${dirs[$i]}
+	scsi_host_dir="$scsi_host_dir/$d"
+	echo $d | egrep -q -e '^host[0-9]+$' && break
+done
+
+if [ $i = ${#dirs[*]} ] ; then
+	exit 0
+fi
+
+PCI_ID=`echo ${dirs[$(( $i - 1 ))]} | awk -F: '{print $2":"$3}'`
+
+# In sas_switch mode, the directory three levels beneath /sys/.../hostX
+# contains symlinks to phy devices that reveal the switch port number.  In
+# sas_direct mode, the phy links one directory down reveal the HBA port.
+port_dir=$scsi_host_dir
+case $TOPOLOGY in
+	"sas_switch") j=$(($i+4)) ;;
+	"sas_direct") j=$(($i + 1)) ;;
+esac
+for (( i++; i<=$j; i++ )); do
+	port_dir="$port_dir/${dirs[$i]}"
+done
+
+PHY=`ls -d $port_dir/phy* 2>/dev/null | head -1 | awk -F: '{print $NF}'`
+if [ -z "$PHY" ] ; then
+	exit 0
+fi
+PORT=$(( $PHY / $PHYS_PER_PORT ))
+
+# Look in /sys/.../sas_device/end_device-X for the bay_identifier
+# attribute.
+end_device_dir=$port_dir
+for (( ; i<${#dirs[*]} ; i++ )); do
+	d=${dirs[$i]}
+	end_device_dir="$end_device_dir/$d"
+	if echo $d | egrep -q -e '^end_device' ; then
+		end_device_dir="$end_device_dir/sas_device/$d"
+		break
+	fi
+done
+
+SLOT=`cat $end_device_dir/bay_identifier 2>/dev/null`
+if [ -z "$SLOT" ] ; then
+	exit 0
+fi
+
+SLOT=`map_slot $SLOT`
+CHAN=`map_channel $PCI_ID $PORT`
+if [ -z "$CHAN" ] ; then
+	exit 0
+fi
+ID_VDEV=${CHAN}${SLOT}${PART}
+
+echo "ID_VDEV=${ID_VDEV}"
+echo "ID_VDEV_PATH=disk/by-vdev/${ID_VDEV}"