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Systemd mount generator: Generate noauto units; add control properties
This commit refactors the systemd mount generators and makes the
following major changes:
- The generator now generates units for datasets marked canmount=noauto,
too. These units are NOT WantedBy local-fs.target.
If there are multiple noauto datasets for a path, no noauto unit will
be created. Datasets with canmount=on are prioritized.
- Introduces handling of new user properties which are now included in
the zfs-list.cache files:
- org.openzfs.systemd:requires:
List of units to require for this mount unit
- org.openzfs.systemd:requires-mounts-for:
List of mounts to require by this mount unit
- org.openzfs.systemd:before:
List of units to order after this mount unit
- org.openzfs.systemd:after:
List of units to order before this mount unit
- org.openzfs.systemd:wanted-by:
List of units to add a Wants dependency on this mount unit to
- org.openzfs.systemd:required-by:
List of units to add a Requires dependency on this mount unit to
- org.openzfs.systemd:nofail:
Toggles between a wants and a requires dependency.
- org.openzfs.systemd:ignore:
Do not generate a mount unit for this dataset.
Consult the updated man page for detailed documentation.
- Restructures and extends the zfs-mount-generator(8) man page with the
above properties, information on unit ordering and a license header.
Reviewed-by: Richard Laager <rlaager@wiktel.com>
Reviewed-by: Antonio Russo <antonio.e.russo@gmail.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: InsanePrawn <insane.prawny@gmail.com>
Closes #9649
This commit is contained in:
InsanePrawn
Brian Behlendorf
parent
9d2f3b7f94
commit
ecbbdac799
@ -46,8 +46,13 @@ case "${ZEVENT_HISTORY_INTERNAL_NAME}" in
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set|inherit)
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# Only act if one of the tracked properties is altered.
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case "${ZEVENT_HISTORY_INTERNAL_STR%%=*}" in
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canmount|mountpoint|atime|relatime|devices|exec| \
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readonly|setuid|nbmand|encroot|keylocation) ;;
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canmount|mountpoint|atime|relatime|devices|exec|readonly| \
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setuid|nbmand|encroot|keylocation|org.openzfs.systemd:requires| \
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org.openzfs.systemd:requires-mounts-for| \
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org.openzfs.systemd:before|org.openzfs.systemd:after| \
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org.openzfs.systemd:wanted-by|org.openzfs.systemd:required-by| \
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org.openzfs.systemd:nofail|org.openzfs.systemd:ignore \
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) ;;
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*) exit 0 ;;
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esac
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;;
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@ -61,8 +66,12 @@ esac
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zed_lock zfs-list
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trap abort_alter EXIT
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PROPS="name,mountpoint,canmount,atime,relatime,devices,exec,readonly"
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PROPS="${PROPS},setuid,nbmand,encroot,keylocation"
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PROPS="name,mountpoint,canmount,atime,relatime,devices,exec\
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,readonly,setuid,nbmand,encroot,keylocation\
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,org.openzfs.systemd:requires,org.openzfs.systemd:requires-mounts-for\
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,org.openzfs.systemd:before,org.openzfs.systemd:after\
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,org.openzfs.systemd:wanted-by,org.openzfs.systemd:required-by\
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,org.openzfs.systemd:nofail,org.openzfs.systemd:ignore"
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"${ZFS}" list -H -t filesystem -o $PROPS -r "${ZEVENT_POOL}" > "${FSLIST_TMP}"
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@ -2,6 +2,7 @@
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# zfs-mount-generator - generates systemd mount units for zfs
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# Copyright (c) 2017 Antonio Russo <antonio.e.russo@gmail.com>
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# Copyright (c) 2020 InsanePrawn <insane.prawny@gmail.com>
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#
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# Permission is hereby granted, free of charge, to any person obtaining
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# a copy of this software and associated documentation files (the
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@ -33,6 +34,35 @@ do_fail() {
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exit 1
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}
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# test if $1 is in space-separated list $2
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is_known() {
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query="$1"
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IFS=' '
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# protect against special characters
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set -f
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for element in $2 ; do
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if [ "$query" = "$element" ] ; then
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return 0
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fi
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done
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return 1
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}
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# create dependency on unit file $1
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# of type $2, i.e. "wants" or "requires"
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# in the target units from space-separated list $3
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create_dependencies() {
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unitfile="$1"
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suffix="$2"
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# protect against special characters
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set -f
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for target in $3 ; do
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target_dir="${dest_norm}/${target}.${suffix}/"
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mkdir -p "${target_dir}"
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ln -s "../${unitfile}" "${target_dir}"
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done
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}
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# see systemd.generator
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if [ $# -eq 0 ] ; then
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dest_norm="/tmp"
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@ -42,11 +72,6 @@ else
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do_fail "zero or three arguments required"
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fi
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# For ZFSs marked "auto", a dependency is created for local-fs.target. To
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# avoid regressions, this dependency is reduced to "wants" rather than
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# "requires". **THIS MAY CHANGE**
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req_dir="${dest_norm}/local-fs.target.wants/"
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mkdir -p "${req_dir}"
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# All needed information about each ZFS is available from
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# zfs list -H -t filesystem -o <properties>
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@ -74,18 +99,58 @@ process_line() {
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p_nbmand="${10}"
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p_encroot="${11}"
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p_keyloc="${12}"
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p_systemd_requires="${13}"
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p_systemd_requiresmountsfor="${14}"
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p_systemd_before="${15}"
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p_systemd_after="${16}"
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p_systemd_wantedby="${17}"
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p_systemd_requiredby="${18}"
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p_systemd_nofail="${19}"
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p_systemd_ignore="${20}"
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# Minimal pre-requisites to mount a ZFS dataset
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# By ordering before zfs-mount.service, we avoid race conditions.
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after="zfs-import.target"
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before="zfs-mount.service"
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wants="zfs-import.target"
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requires=""
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requiredmounts=""
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wantedby=""
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requiredby=""
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noauto="off"
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if [ -n "${p_systemd_after}" ] && \
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[ "${p_systemd_after}" != "-" ] ; then
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after="${p_systemd_after} ${after}"
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fi
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if [ -n "${p_systemd_before}" ] && \
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[ "${p_systemd_before}" != "-" ] ; then
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before="${p_systemd_before} ${before}"
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fi
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if [ -n "${p_systemd_requires}" ] && \
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[ "${p_systemd_requires}" != "-" ] ; then
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requires="Requires=${p_systemd_requires}"
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fi
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if [ -n "${p_systemd_requiresmountsfor}" ] && \
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[ "${p_systemd_requiresmountsfor}" != "-" ] ; then
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requiredmounts="RequiresMountsFor=${p_systemd_requiresmountsfor}"
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fi
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# Handle encryption
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if [ -n "${p_encroot}" ] &&
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[ "${p_encroot}" != "-" ] ; then
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keyloadunit="zfs-load-key-$(systemd-escape "${p_encroot}").service"
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if [ "${p_encroot}" = "${dataset}" ] ; then
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pathdep=""
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keymountdep=""
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if [ "${p_keyloc%%://*}" = "file" ] ; then
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pathdep="RequiresMountsFor='${p_keyloc#file://}'"
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if [ -n "${requiredmounts}" ] ; then
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keymountdep="${requiredmounts} '${p_keyloc#file://}'"
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else
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keymountdep="RequiresMountsFor='${p_keyloc#file://}'"
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fi
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keyloadcmd="@sbindir@/zfs load-key '${dataset}'"
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elif [ "${p_keyloc}" = "prompt" ] ; then
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keyloadcmd="\
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@ -121,8 +186,10 @@ SourcePath=${cachefile}
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Documentation=man:zfs-mount-generator(8)
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DefaultDependencies=no
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Wants=${wants}
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After=${wants}
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${pathdep}
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After=${after}
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Before=${before}
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${requires}
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${keymountdep}
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[Service]
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Type=oneshot
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@ -130,23 +197,35 @@ RemainAfterExit=yes
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ExecStart=${keyloadcmd}
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ExecStop=@sbindir@/zfs unload-key '${dataset}'" > "${dest_norm}/${keyloadunit}"
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fi
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# Update the dependencies for the mount file to require the
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# Update the dependencies for the mount file to want the
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# key-loading unit.
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wants="${wants} ${keyloadunit}"
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after="${after} ${keyloadunit}"
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fi
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# Prepare the .mount unit
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# skip generation of the mount unit if org.openzfs.systemd:ignore is "on"
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if [ -n "${p_systemd_ignore}" ] ; then
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if [ "${p_systemd_ignore}" = "on" ] ; then
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return
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elif [ "${p_systemd_ignore}" = "-" ] \
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|| [ "${p_systemd_ignore}" = "off" ] ; then
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: # This is OK
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else
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do_fail "invalid org.openzfs.systemd:ignore for ${dataset}"
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fi
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fi
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# Check for canmount=off .
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if [ "${p_canmount}" = "off" ] ; then
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return
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elif [ "${p_canmount}" = "noauto" ] ; then
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# Don't let a noauto marked mountpoint block an "auto" marked mountpoint
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return
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noauto="on"
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elif [ "${p_canmount}" = "on" ] ; then
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: # This is OK
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else
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do_fail "invalid canmount"
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do_fail "invalid canmount for ${dataset}"
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fi
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# Check for legacy and blank mountpoints.
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@ -155,7 +234,7 @@ ExecStop=@sbindir@/zfs unload-key '${dataset}'" > "${dest_norm}/${keyloadunit}
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elif [ "${p_mountpoint}" = "none" ] ; then
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return
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elif [ "${p_mountpoint%"${p_mountpoint#?}"}" != "/" ] ; then
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do_fail "invalid mountpoint $*"
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do_fail "invalid mountpoint for ${dataset}"
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fi
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# Escape the mountpoint per systemd policy.
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@ -233,15 +312,91 @@ ExecStop=@sbindir@/zfs unload-key '${dataset}'" > "${dest_norm}/${keyloadunit}
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"${dataset}" >/dev/kmsg
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fi
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# If the mountpoint has already been created, give it precedence.
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if [ -n "${p_systemd_wantedby}" ] && \
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[ "${p_systemd_wantedby}" != "-" ] ; then
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noauto="on"
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if [ "${p_systemd_wantedby}" = "none" ] ; then
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wantedby=""
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else
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wantedby="${p_systemd_wantedby}"
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before="${before} ${wantedby}"
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fi
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fi
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if [ -n "${p_systemd_requiredby}" ] && \
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[ "${p_systemd_requiredby}" != "-" ] ; then
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noauto="on"
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if [ "${p_systemd_requiredby}" = "none" ] ; then
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requiredby=""
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else
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requiredby="${p_systemd_requiredby}"
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before="${before} ${requiredby}"
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fi
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fi
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# For datasets with canmount=on, a dependency is created for
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# local-fs.target by default. To avoid regressions, this dependency
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# is reduced to "wants" rather than "requires" when nofail is not "off".
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# **THIS MAY CHANGE**
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# noauto=on disables this behavior completely.
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if [ "${noauto}" != "on" ] ; then
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if [ "${p_systemd_nofail}" = "off" ] ; then
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requiredby="local-fs.target"
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before="${before} local-fs.target"
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else
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wantedby="local-fs.target"
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if [ "${p_systemd_nofail}" != "on" ] ; then
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before="${before} local-fs.target"
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fi
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fi
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fi
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# Handle existing files:
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# 1. We never overwrite existing files, although we may delete
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# files if we're sure they were created by us. (see 5.)
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# 2. We handle files differently based on canmount. Units with canmount=on
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# always have precedence over noauto. This is enforced by the sort pipe
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# in the loop around this function.
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# It is important to use $p_canmount and not $noauto here, since we
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# sort by canmount while other properties also modify $noauto, e.g.
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# org.openzfs.systemd:wanted-by.
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# 3. If no unit file exists for a noauto dataset, we create one.
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# Additionally, we use $noauto_files to track the unit file names
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# (which are the systemd-escaped mountpoints) of all (exclusively)
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# noauto datasets that had a file created.
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# 4. If the file to be created is found in the tracking variable,
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# we do NOT create it.
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# 5. If a file exists for a noauto dataset, we check whether the file
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# name is in the variable. If it is, we have multiple noauto datasets
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# for the same mountpoint. In such cases, we remove the file for safety.
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# To avoid further noauto datasets creating a file for this path again,
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# we leave the file name in the tracking variable.
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if [ -e "${dest_norm}/${mountfile}" ] ; then
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printf 'zfs-mount-generator: %s already exists\n' "${mountfile}" \
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>/dev/kmsg
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if is_known "$mountfile" "$noauto_files" ; then
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# if it's in $noauto_files, we must be noauto too. See 2.
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printf 'zfs-mount-generator: removing duplicate noauto %s\n' \
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"${mountfile}" >/dev/kmsg
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# See 5.
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rm "${dest_norm}/${mountfile}"
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else
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# don't log for canmount=noauto
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if [ "${p_canmount}" = "on" ] ; then
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printf 'zfs-mount-generator: %s already exists. Skipping.\n' \
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"${mountfile}" >/dev/kmsg
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fi
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fi
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# file exists; Skip current dataset.
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return
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else
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if is_known "${mountfile}" "${noauto_files}" ; then
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# See 4.
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return
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elif [ "${p_canmount}" = "noauto" ] ; then
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noauto_files="${mountfile} ${noauto_files}"
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fi
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fi
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# Create the .mount unit file.
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# By ordering before zfs-mount.service, we avoid race conditions.
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#
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# (Do not use `<<EOF`-style here-documents for this, see warning above)
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#
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@ -251,9 +406,12 @@ ExecStop=@sbindir@/zfs unload-key '${dataset}'" > "${dest_norm}/${keyloadunit}
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[Unit]
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SourcePath=${cachefile}
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Documentation=man:zfs-mount-generator(8)
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Before=local-fs.target zfs-mount.service
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After=${wants}
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Before=${before}
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After=${after}
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Wants=${wants}
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${requires}
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${requiredmounts}
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[Mount]
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Where=${p_mountpoint}
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@ -261,13 +419,20 @@ What=${dataset}
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Type=zfs
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Options=defaults${opts},zfsutil" > "${dest_norm}/${mountfile}"
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# Finally, create the appropriate dependency
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ln -s "../${mountfile}" "${req_dir}"
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# Finally, create the appropriate dependencies
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create_dependencies "${mountfile}" "wants" "$wantedby"
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create_dependencies "${mountfile}" "requires" "$requiredby"
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}
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# Feed each line into process_line
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for cachefile in "${FSLIST}/"* ; do
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while read -r fs ; do
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process_line "${fs}"
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done < "${cachefile}"
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# Sort cachefile's lines by canmount, "on" before "noauto"
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# and feed each line into process_line
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sort -t "$(printf '\t')" -k 3 -r "${cachefile}" | \
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( # subshell is necessary for `sort|while read` and $noauto_files
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noauto_files=""
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while read -r fs ; do
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process_line "${fs}"
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done
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)
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done
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@ -89,6 +89,7 @@ EXTRA_DIST = \
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$(nodist_man_MANS): %: %.in
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-$(SED) -e 's,@zfsexecdir\@,$(zfsexecdir),g' \
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-e 's,@systemdgeneratordir\@,$(systemdgeneratordir),g' \
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-e 's,@runstatedir\@,$(runstatedir),g' \
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-e 's,@sysconfdir\@,$(sysconfdir),g' \
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$< >'$@'
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@ -1,8 +1,33 @@
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.TH "ZFS\-MOUNT\-GENERATOR" "8" "ZFS" "zfs-mount-generator" "\""
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.\"
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.\" Copyright 2018 Antonio Russo <antonio.e.russo@gmail.com>
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.\" Copyright 2019 Kjeld Schouten-Lebbing <kjeld@schouten-lebbing.nl>
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.\" Copyright 2020 InsanePrawn <insane.prawny@gmail.com>
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.\"
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.\" Permission is hereby granted, free of charge, to any person obtaining
|
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.\" a copy of this software and associated documentation files (the
|
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.\" "Software"), to deal in the Software without restriction, including
|
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.\" without limitation the rights to use, copy, modify, merge, publish,
|
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.\" distribute, sublicense, and/or sell copies of the Software, and to
|
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.\" permit persons to whom the Software is furnished to do so, subject to
|
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.\" the following conditions:
|
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.\"
|
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.\" The above copyright notice and this permission notice shall be
|
||||
.\" included in all copies or substantial portions of the Software.
|
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.\"
|
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.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
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.\" EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
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.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
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.\" NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
|
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.\" LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
|
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.\" OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
|
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.\" WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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.TH "ZFS\-MOUNT\-GENERATOR" "8" "2020-01-19" "ZFS" "zfs-mount-generator" "\""
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.SH "NAME"
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zfs\-mount\-generator \- generates systemd mount units for ZFS
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.SH SYNOPSIS
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.B /lib/systemd/system-generators/zfs\-mount\-generator
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.B @systemdgeneratordir@/zfs\-mount\-generator
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.sp
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.SH DESCRIPTION
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zfs\-mount\-generator implements the \fBGenerators Specification\fP
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@ -11,22 +36,50 @@ of
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and is called during early boot to generate
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.BR systemd.mount (5)
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units for automatically mounted datasets. Mount ordering and dependencies
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are created for all tracked pools (see below). If a dataset has
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.BR canmount=on
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and
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.BR mountpoint
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set, the
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.BR auto
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mount option will be set, and a dependency for
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.BR local-fs.target
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||||
on the mount will be created.
|
||||
are created for all tracked pools (see below).
|
||||
|
||||
Because zfs pools may not be available very early in the boot process,
|
||||
information on ZFS mountpoints must be stored separately. The output
|
||||
of the command
|
||||
.SS ENCRYPTION KEYS
|
||||
If the dataset is an encryption root, a service that loads the associated key (either from file or through a
|
||||
.BR systemd\-ask\-password (1)
|
||||
prompt) will be created. This service
|
||||
. BR RequiresMountsFor
|
||||
the path of the key (if file-based) and also copies the mount unit's
|
||||
.BR After ,
|
||||
.BR Before
|
||||
and
|
||||
.BR Requires .
|
||||
All mount units of encrypted datasets add the key\-load service for their encryption root to their
|
||||
.BR Wants
|
||||
and
|
||||
.BR After .
|
||||
The service will not be
|
||||
.BR Want ed
|
||||
or
|
||||
.BR Require d
|
||||
by
|
||||
.BR local-fs.target
|
||||
directly, and so will only be started manually or as a dependency of a started mount unit.
|
||||
|
||||
.SS UNIT ORDERING AND DEPENDENCIES
|
||||
mount unit's
|
||||
.BR Before
|
||||
\->
|
||||
key\-load service (if any)
|
||||
\->
|
||||
mount unit
|
||||
\->
|
||||
mount unit's
|
||||
.BR After
|
||||
|
||||
It is worth nothing that when a mount unit is activated, it activates all available mount units for parent paths to its mountpoint, i.e. activating the mount unit for /tmp/foo/1/2/3 automatically activates all available mount units for /tmp, /tmp/foo, /tmp/foo/1, and /tmp/foo/1/2. This is true for any combination of mount units from any sources, not just ZFS.
|
||||
|
||||
.SS CACHE FILE
|
||||
Because ZFS pools may not be available very early in the boot process,
|
||||
information on ZFS mountpoints must be stored separately. The output of the command
|
||||
.PP
|
||||
.RS 4
|
||||
zfs list -H -o name,mountpoint,canmount,atime,relatime,devices,exec,readonly,setuid,nbmand,encroot,keylocation
|
||||
zfs list -H -o name,mountpoint,canmount,atime,relatime,devices,exec,readonly,setuid,nbmand,encroot,keylocation,org.openzfs.systemd:requires,org.openzfs.systemd:requires-mounts-for,org.openzfs.systemd:before,org.openzfs.systemd:after,org.openzfs.systemd:wanted-by,org.openzfs.systemd:required-by,org.openzfs.systemd:nofail,org.openzfs.systemd:ignore
|
||||
|
||||
.RE
|
||||
.PP
|
||||
for datasets that should be mounted by systemd, should be kept
|
||||
@ -45,6 +98,98 @@ history_event-zfs-list-cacher.sh .
|
||||
.RE
|
||||
.PP
|
||||
.sp
|
||||
.SS PROPERTIES
|
||||
The behavior of the generator script can be influenced by the following dataset properties:
|
||||
.sp
|
||||
.TP 4
|
||||
.BR canmount = on | off | noauto
|
||||
If a dataset has
|
||||
.BR mountpoint
|
||||
set and
|
||||
.BR canmount
|
||||
is not
|
||||
.BR off ,
|
||||
a mount unit will be generated.
|
||||
Additionally, if
|
||||
.BR canmount
|
||||
is
|
||||
.BR on ,
|
||||
.BR local-fs.target
|
||||
will gain a dependency on the mount unit.
|
||||
|
||||
This behavior is equal to the
|
||||
.BR auto
|
||||
and
|
||||
.BR noauto
|
||||
legacy mount options, see
|
||||
.BR systemd.mount (5).
|
||||
|
||||
Encryption roots always generate a key-load service, even for
|
||||
.BR canmount=off .
|
||||
.TP 4
|
||||
.BR org.openzfs.systemd:requires\-mounts\-for = \fIpath\fR...
|
||||
Space\-separated list of mountpoints to require to be mounted for this mount unit
|
||||
.TP 4
|
||||
.BR org.openzfs.systemd:before = \fIunit\fR...
|
||||
The mount unit and associated key\-load service will be ordered before this space\-separated list of units.
|
||||
.TP 4
|
||||
.BR org.openzfs.systemd:after = \fIunit\fR...
|
||||
The mount unit and associated key\-load service will be ordered after this space\-separated list of units.
|
||||
.TP 4
|
||||
.BR org.openzfs.systemd:wanted\-by = \fIunit\fR...
|
||||
Space-separated list of units that will gain a
|
||||
.BR Wants
|
||||
dependency on this mount unit.
|
||||
Setting this property implies
|
||||
.BR noauto .
|
||||
.TP 4
|
||||
.BR org.openzfs.systemd:required\-by = \fIunit\fR...
|
||||
Space-separated list of units that will gain a
|
||||
.BR Requires
|
||||
dependency on this mount unit.
|
||||
Setting this property implies
|
||||
.BR noauto .
|
||||
.TP 4
|
||||
.BR org.openzfs.systemd:nofail = unset | on | off
|
||||
Toggles between a
|
||||
.BR Wants
|
||||
and
|
||||
.BR Requires
|
||||
type of dependency between the mount unit and
|
||||
.BR local-fs.target ,
|
||||
if
|
||||
.BR noauto
|
||||
isn't set or implied.
|
||||
|
||||
.BR on :
|
||||
Mount will be
|
||||
.BR WantedBy
|
||||
local-fs.target
|
||||
|
||||
.BR off :
|
||||
Mount will be
|
||||
.BR Before
|
||||
and
|
||||
.BR RequiredBy
|
||||
local-fs.target
|
||||
|
||||
.BR unset :
|
||||
Mount will be
|
||||
.BR Before
|
||||
and
|
||||
.BR WantedBy
|
||||
local-fs.target
|
||||
.TP 4
|
||||
.BR org.openzfs.systemd:ignore = on | off
|
||||
If set to
|
||||
.BR on ,
|
||||
do not generate a mount unit for this dataset.
|
||||
|
||||
.RE
|
||||
See also
|
||||
.BR systemd.mount (5)
|
||||
|
||||
.PP
|
||||
.SH EXAMPLE
|
||||
To begin, enable tracking for the pool:
|
||||
.PP
|
||||
@ -63,7 +208,9 @@ systemctl enable zfs-zed.service
|
||||
systemctl restart zfs-zed.service
|
||||
.RE
|
||||
.PP
|
||||
Force the running of the ZEDLET by setting canmount=on for at least one dataset in the pool:
|
||||
Force the running of the ZEDLET by setting a monitored property, e.g.
|
||||
.BR canmount ,
|
||||
for at least one dataset in the pool:
|
||||
.PP
|
||||
.RS 4
|
||||
zfs set canmount=on
|
||||
@ -71,6 +218,24 @@ zfs set canmount=on
|
||||
.RE
|
||||
.PP
|
||||
This forces an update to the stale cache file.
|
||||
|
||||
To test the generator output, run
|
||||
.PP
|
||||
.RS 4
|
||||
@systemdgeneratordir@/zfs-mount-generator /tmp/zfs-mount-generator . .
|
||||
.RE
|
||||
.PP
|
||||
This will generate units and dependencies in
|
||||
.I /tmp/zfs-mount-generator
|
||||
for you to inspect them. The second and third argument are ignored.
|
||||
|
||||
If you're satisfied with the generated units, instruct systemd to re-run all generators:
|
||||
.PP
|
||||
.RS 4
|
||||
systemctl daemon-reload
|
||||
.RE
|
||||
.PP
|
||||
|
||||
.sp
|
||||
.SH SEE ALSO
|
||||
.BR zfs (5)
|
||||
|
||||
Loading…
Reference in New Issue
Block a user