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vdev_id support for device link aliases
Add a vdev_id feature to map device names based on already defined
udev device links. To increase the odds that vdev_id will run after
the rules it depends on, increase the vdev.rules rule number from 60
to 69. With this change, vdev_id now provides functionality analogous
to zpool_id and zpool_layout, paving the way to retire those tools.
A defined alias takes precedence over a topology-derived name, but the
two naming methods can otherwise coexist. For example, one might name
drives in a JBOD with the sas_direct topology while naming an internal
L2ARC device with an alias.
For example, the following lines in vdev_id.conf will result in the
creation of links /dev/disk/by-vdev/{d1,d2}, each pointing to the same
target as the device link specified in the third field.
# by-vdev
# name fully qualified or base name of device link
alias d1 /dev/disk/by-id/wwn-0x5000c5002de3b9ca
alias d2 wwn-0x5000c5002def789e
Also perform some minor vdev_id cleanup, such as removal of the unused
-s command line option.
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #981
This commit is contained in:
Ned Bass
Brian Behlendorf
parent
e89260a1c8
commit
2957f38d78
@ -11,13 +11,17 @@
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# default numbering is unsatisfactory. The drive aliases will be
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# created as symbolic links in /dev/disk/by-vdev.
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#
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# The only currently supported topologies are sas_direct and
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# sas_switch. A multipath mode is supported in which dm-mpath
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# devices are handled by examining the first-listed running
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# component disk. In multipath mode the configuration file
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# should contain a channel definition with the same name for
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# each path to a given enclosure.
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# The currently supported topologies are sas_direct and sas_switch.
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# A multipath mode is supported in which dm-mpath devices are
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# handled by examining the first-listed running component disk. In
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# multipath mode the configuration file should contain a channel
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# definition with the same name for each path to a given enclosure.
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#
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# The alias keyword provides a simple way to map already-existing
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# device symlinks to more convenient names. It is suitable for
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# small, static configurations or for sites that have some automated
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# way to generate the mapping file.
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#
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#
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# Some example configuration files are given below.
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@ -72,12 +76,19 @@
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# channel 86:00.0 1 A
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# channel 86:00.0 0 B
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# #
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# # Example vdev_id.conf - alias
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# #
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#
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# # by-vdev
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# # name fully qualified or base name of device link
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# alias d1 /dev/disk/by-id/wwn-0x5000c5002de3b9ca
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# alias d2 wwn-0x5000c5002def789e
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PATH=/bin:/sbin:/usr/bin:/usr/sbin
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CONFIG=/etc/zfs/vdev_id.conf
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PHYS_PER_PORT=
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DEV=
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SLOT_MAP=
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CHANNEL_MAP=
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MULTIPATH=
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TOPOLOGY=
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@ -128,58 +139,7 @@ map_channel() {
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printf "%s" ${MAPPED_CHAN}
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}
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while getopts 'c:s:d:g:mp:h' OPTION; do
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case ${OPTION} in
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c)
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CONFIG=`readlink -e ${OPTARG}`
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;;
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d)
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DEV=${OPTARG}
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;;
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g)
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TOPOLOGY=$OPTARG
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;;
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p)
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PHYS_PER_PORT=${OPTARG}
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;;
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m)
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MULTIPATH_MODE=yes
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;;
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s)
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SLOT_MAP=`readlink -e ${OPTARG}`
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if [ ! -r $SLOT_MAP ] ; then
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echo "Error: $SLOT_MAP is nonexistant or unreadable"
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exit 1
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fi
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;;
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h)
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usage
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;;
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esac
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done
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if [ ! -r $CONFIG ] ; then
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exit 0
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fi
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if [ -z "$DEV" ] ; then
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echo "Error: missing required option -d"
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exit 1
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fi
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if [ -z "$TOPOLOGY" ] ; then
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TOPOLOGY=`awk "/^topology /{print \\$2; exit}" $CONFIG`
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fi
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TOPOLOGY=${TOPOLOGY:-sas_direct}
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case $TOPOLOGY in
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sas_direct|sas_switch)
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;;
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*)
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echo "Error: unknown topology $TOPOLOGY"
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exit 1
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;;
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esac
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sas_handler() {
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if [ -z "$PHYS_PER_PORT" ] ; then
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PHYS_PER_PORT=`awk "/^phys_per_port /{print \\$2;exit}" $CONFIG`
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fi
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@ -193,18 +153,20 @@ if [ -z "$MULTIPATH_MODE" ] ; then
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MULTIPATH_MODE=`awk "/^multipath /{print \\$2; exit}" $CONFIG`
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fi
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# Use first running component device if we're handling a dm-mpath device.
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# Use first running component device if we're handling a dm-mpath device
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if [ "$MULTIPATH_MODE" = "yes" ] ; then
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# If udev didn't tell us the UUID via DM_NAME, find it in /dev/mapper
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# If udev didn't tell us the UUID via DM_NAME, check /dev/mapper
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if [ -z "$DM_NAME" ] ; then
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DM_NAME=`ls -l --full-time /dev/mapper |
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awk "/\/$DEV$/{print \\$9}"`
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fi
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# For raw disks udev exports DEVTYPE=partition when handling partitions,
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# and the rules can be written to take advantage of this to append a
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# -part suffix. For dm devices we get DEVTYPE=disk even for partitions
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# so we have to append the -part suffix directly in the helper.
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# For raw disks udev exports DEVTYPE=partition when
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# handling partitions, and the rules can be written to
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# take advantage of this to append a -part suffix. For
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# dm devices we get DEVTYPE=disk even for partitions so
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# we have to append the -part suffix directly in the
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# helper.
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if [ "$DEVTYPE" != "partition" ] ; then
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PART=`echo $DM_NAME | awk -Fp '/p/{print "-part"$2}'`
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fi
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@ -212,13 +174,13 @@ if [ "$MULTIPATH_MODE" = "yes" ] ; then
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# Strip off partition information.
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DM_NAME=`echo $DM_NAME | sed 's/p[0-9][0-9]*$//'`
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if [ -z "$DM_NAME" ] ; then
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exit 0
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return
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fi
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# Get the raw scsi device name from multipath -l.
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DEV=`multipath -l $DM_NAME |awk '/running/{print $3 ; exit}'`
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if [ -z "$DEV" ] ; then
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exit 0
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return
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fi
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fi
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@ -243,14 +205,15 @@ while [ $i -le $num_dirs ] ; do
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done
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if [ $i = $num_dirs ] ; then
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exit 0
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return
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fi
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PCI_ID=$(eval echo \${$(($i -1))} | awk -F: '{print $2":"$3}')
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# In sas_switch mode, the directory four levels beneath /sys/.../hostX
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# contains symlinks to phy devices that reveal the switch port number. In
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# sas_direct mode, the phy links one directory down reveal the HBA port.
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# In sas_switch mode, the directory four levels beneath
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# /sys/.../hostX contains symlinks to phy devices that reveal
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# the switch port number. In sas_direct mode, the phy links one
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# directory down reveal the HBA port.
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port_dir=$scsi_host_dir
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case $TOPOLOGY in
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"sas_switch") j=$(($i + 4)) ;;
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@ -265,7 +228,7 @@ done
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PHY=`ls -d $port_dir/phy* 2>/dev/null | head -1 | awk -F: '{print $NF}'`
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if [ -z "$PHY" ] ; then
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exit 0
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return
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fi
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PORT=$(( $PHY / $PHYS_PER_PORT ))
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@ -284,15 +247,125 @@ done
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SLOT=`cat $end_device_dir/bay_identifier 2>/dev/null`
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if [ -z "$SLOT" ] ; then
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exit 0
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return
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fi
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SLOT=`map_slot $SLOT`
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CHAN=`map_channel $PCI_ID $PORT`
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if [ -z "$CHAN" ] ; then
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return
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fi
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echo ${CHAN}${SLOT}${PART}
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}
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alias_handler () {
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# Special handling is needed to correctly append a -part suffix
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# to partitions of device mapper devices. The DEVTYPE attribute
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# is normally set to "disk" instead of "partition" in this case,
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# so the udev rules won't handle that for us as they do for
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# "plain" block devices.
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#
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# For example, we may have the following links for a device and its
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# partitions,
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#
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# /dev/disk/by-id/dm-name-isw_dibgbfcije_ARRAY0 -> ../../dm-0
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# /dev/disk/by-id/dm-name-isw_dibgbfcije_ARRAY0p1 -> ../../dm-1
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# /dev/disk/by-id/dm-name-isw_dibgbfcije_ARRAY0p2 -> ../../dm-3
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#
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# and the following alias in vdev_id.conf.
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#
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# alias A0 dm-name-isw_dibgbfcije_ARRAY0
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#
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# The desired outcome is for the following links to be created
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# without having explicitly defined aliases for the partitions.
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#
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# /dev/disk/by-vdev/A0 -> ../../dm-0
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# /dev/disk/by-vdev/A0-part1 -> ../../dm-1
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# /dev/disk/by-vdev/A0-part2 -> ../../dm-3
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#
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# Warning: The following grep pattern will misidentify whole-disk
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# devices whose names end with 'p' followed by a string of
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# digits as partitions, causing alias creation to fail. This
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# ambiguity seems unavoidable, so devices using this facility
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# must not use such names.
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local DM_PART=
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if echo $DM_NAME | grep -q -E 'p[0-9][0-9]*$' ; then
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if [ "$DEVTYPE" != "partition" ] ; then
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DM_PART=`echo $DM_NAME | awk -Fp '/p/{print "-part"$2}'`
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fi
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fi
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# DEVLINKS attribute must have been populated by already-run udev rules.
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for link in $DEVLINKS ; do
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# Remove partition information to match key of top-level device.
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if [ -n "$DM_PART" ] ; then
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link=`echo $link | sed 's/p[0-9][0-9]*$//'`
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fi
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# Check both the fully qualified and the base name of link.
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for l in $link `basename $link` ; do
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alias=`awk "/^alias / && \\$3 == \"${l}\" \
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{ print \\$2; exit }" $CONFIG`
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if [ -n "$alias" ] ; then
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echo ${alias}${DM_PART}
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return
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fi
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done
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done
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}
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while getopts 'c:d:g:mp:h' OPTION; do
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case ${OPTION} in
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c)
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CONFIG=${OPTARG}
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;;
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d)
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DEV=${OPTARG}
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;;
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g)
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TOPOLOGY=$OPTARG
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;;
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p)
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PHYS_PER_PORT=${OPTARG}
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;;
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m)
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MULTIPATH_MODE=yes
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;;
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h)
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usage
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;;
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esac
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done
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if [ ! -r $CONFIG ] ; then
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exit 0
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fi
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ID_VDEV=${CHAN}${SLOT}${PART}
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if [ -z "$DEV" ] ; then
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echo "Error: missing required option -d"
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exit 1
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fi
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if [ -z "$TOPOLOGY" ] ; then
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TOPOLOGY=`awk "/^topology /{print \\$2; exit}" $CONFIG`
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fi
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# First check if an alias was defined for this device.
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ID_VDEV=`alias_handler`
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if [ -z "$ID_VDEV" ] ; then
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TOPOLOGY=${TOPOLOGY:-sas_direct}
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case $TOPOLOGY in
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sas_direct|sas_switch)
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ID_VDEV=`sas_handler`
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;;
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*)
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echo "Error: unknown topology $TOPOLOGY"
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exit 1
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;;
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esac
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fi
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if [ -n "$ID_VDEV" ] ; then
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echo "ID_VDEV=${ID_VDEV}"
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echo "ID_VDEV_PATH=disk/by-vdev/${ID_VDEV}"
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fi
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@ -1,6 +1,7 @@
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pkgsysconfdir = $(sysconfdir)/zfs
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pkgsysconf_DATA = \
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vdev_id.conf.alias.example \
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vdev_id.conf.sas_direct.example \
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vdev_id.conf.sas_switch.example \
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vdev_id.conf.multipath.example \
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4
etc/zfs/vdev_id.conf.alias.example
Normal file
4
etc/zfs/vdev_id.conf.alias.example
Normal file
@ -0,0 +1,4 @@
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# by-vdev
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# name fully qualified or base name of device link
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alias d1 /dev/disk/by-id/wwn-0x5000c5002de3b9ca
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alias d2 wwn-0x5000c5002def789e
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@ -17,6 +17,22 @@ keyword is ignored. Comments may optionally begin with a hash
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character.
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The following keywords and values are used.
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.TP
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\fIalias\fR <name> <devlink>
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Maps a device link in the /dev directory hierarchy to a new device
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name. The udev rule defining the device link must have run prior to
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.BR vdev_id (8).
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A defined alias takes precedence over a topology-derived name, but the
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two naming methods can otherwise coexist. For example, one might name
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drives in a JBOD with the sas_direct topology while naming an internal
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L2ARC device with an alias.
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\fIname\fR - the name of the link to the device that will by created in
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/dev/disk/by-vdev.
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\fIdevlink\fR - the name of the device link that has already been
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defined by udev. This may be an absolute path or the base filename.
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.TP
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\fIchannel\fR [pci_slot] <port> <name>
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Maps a physical path to a channel name (typically representing a single
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@ -59,7 +75,7 @@ a SAS switch port number
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.TP
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\fIphys_per_port\fR <num>
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Specifies the number of PHY devices are associated with a SAS HBA port or SAS
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Specifies the number of PHY devices associated with a SAS HBA port or SAS
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switch port.
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.BR vdev_id (8)
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internally uses this value to determine which HBA or switch port a
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@ -150,6 +166,18 @@ definitions - one per physical path.
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channel 86:00.0 0 B
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.br
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.P
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A configuration using device link aliases.
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.P
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.br
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# by-vdev
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.br
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# name fully qualified or base name of device link
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.br
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alias d1 /dev/disk/by-id/wwn-0x5000c5002de3b9ca
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.br
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alias d2 wwn-0x5000c5002def789e
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.br
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.P
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.SH FILES
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.TP
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@ -19,15 +19,20 @@ drives. Slot numbers may also be re-mapped in case the default
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numbering is unsatisfactory. The drive aliases will be created as
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symbolic links in /dev/disk/by-vdev.
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The only currently supported topologies are sas_direct and
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sas_switch. A multipath mode is supported in which dm-mpath
|
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devices are handled by examining the first-listed running
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component disk as reported by the
|
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The currently supported topologies are sas_direct and sas_switch. A
|
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multipath mode is supported in which dm-mpath devices are handled by
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examining the first-listed running component disk as reported by the
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.BR multipath (8)
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command. In multipath mode the configuration file should contain a
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channel definition with the same name for each path to a given
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enclosure.
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.BR vdev_id
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also supports creating aliases based on existing udev links in the /dev
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hierarchy using the \fIalias\fR configuration file keyword. See the
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.BR vdev_id.conf (5)
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man page for details.
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.SH OPTIONS
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.TP
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\fB\-c\fR <config_file>
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@ -1,5 +1,5 @@
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#
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# @udevdir@/rules.d/60-vdev.rules
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# @udevdir@/rules.d/69-vdev.rules
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#
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ENV{DEVTYPE}=="disk", IMPORT{program}="@udevdir@/vdev_id -d %k"
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@ -1,11 +1,11 @@
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udevrule_DATA = \
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$(top_srcdir)/udev/rules.d/60-vdev.rules \
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$(top_srcdir)/udev/rules.d/69-vdev.rules \
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$(top_srcdir)/udev/rules.d/60-zpool.rules \
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$(top_srcdir)/udev/rules.d/60-zvol.rules \
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$(top_srcdir)/udev/rules.d/90-zfs.rules
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EXTRA_DIST = \
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$(top_srcdir)/udev/rules.d/60-vdev.rules.in \
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$(top_srcdir)/udev/rules.d/69-vdev.rules.in \
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$(top_srcdir)/udev/rules.d/60-zpool.rules.in \
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$(top_srcdir)/udev/rules.d/60-zvol.rules.in \
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$(top_srcdir)/udev/rules.d/90-zfs.rules.in
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