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2d815d955e
zpool-destroy.8: flatten, fix description zfs-wait.8: flatten, fix description, use list for events zpool-reguid.8: flatten, fix description zpool-history.8: flatten, fix description zpool-export.8: flatten, fix description, remove -f "unmount" reference AFAICT no such command exists even in Illumos (as of today, anyway), and we definitely don't call it zpool-labelclear.8: flatten, fix description zpool-features.5: modernise spl-module-parameters.5: modernise zfs-mount-generator.8: rewrite zfs-module-parameters.5: modernise Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz> Closes #12169
193 lines
6.6 KiB
Groff
193 lines
6.6 KiB
Groff
.\"
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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
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.\" 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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.\"
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.Dd May 31, 2021
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.Dt ZFS-MOUNT-GENERATOR 8
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.Os
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.
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.Sh NAME
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.Nm zfs-mount-generator
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.Nd generate systemd mount units for ZFS filesystems
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.Sh SYNOPSIS
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.Pa @systemdgeneratordir@/zfs-mount-generator
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.
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.Sh DESCRIPTION
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.Nm
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is a
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.Xr systemd.generator 7
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that generates native
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.Xr systemd.mount 5
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units for configured ZFS datasets.
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.
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.Ss Properties
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.Bl -tag -compact -width "org.openzfs.systemd:required-by=unit[ unit]…"
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.It Sy mountpoint Ns =
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.No Skipped if Sy legacy No or Sy none .
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.
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.It Sy canmount Ns =
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.No Skipped if Sy off .
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.No Skipped if only Sy noauto
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datasets exist for a given mountpoint and there's more than one.
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.No Datasets with Sy yes No take precedence over ones with Sy noauto No for the same mountpoint.
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.No Sets logical Em noauto No flag if Sy noauto .
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Encryption roots always generate
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.Sy zfs-load-key@ Ns Ar root Ns Sy .service ,
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even if
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.Sy off .
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.
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.It Sy atime Ns = , Sy relatime Ns = , Sy devices Ns = , Sy exec Ns = , Sy readonly Ns = , Sy setuid Ns = , Sy nbmand Ns =
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Used to generate mount options equivalent to
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.Nm zfs Cm mount .
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.
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.It Sy encroot Ns = , Sy keylocation Ns =
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If the dataset is an encryption root, its mount unit will bind to
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.Sy zfs-load-key@ Ns Ar root Ns Sy .service ,
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with additional dependencies as follows:
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.Bl -tag -compact -offset Ds -width "keylocation=https://URL (et al.)"
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.It Sy keylocation Ns = Ns Sy prompt
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None, uses
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.Xr systemd-ask-password 1
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.It Sy keylocation Ns = Ns Sy https:// Ns Ar URL Pq et al.\&
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.Sy Wants Ns = , Sy After Ns = : Pa network-online.target
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.It Sy keylocation Ns = Ns Sy file:// Ns < Ns Ar path Ns >
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.Sy RequiresMountsFor Ns = Ns Ar path
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.El
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.
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The service also uses the same
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.Sy Wants Ns = ,
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.Sy After Ns = ,
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.Sy Requires Ns = , No and
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.Sy RequiresMountsFor Ns = ,
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as the mount unit.
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.
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.It Sy org.openzfs.systemd:requires Ns = Ns Pa path Ns Oo " " Ns Pa path Oc Ns …
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.No Sets Sy Requires Ns = for the mount- and key-loading unit.
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.
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.It Sy org.openzfs.systemd:requires-mounts-for Ns = Ns Pa path Ns Oo " " Ns Pa path Oc Ns …
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.No Sets Sy RequiresMountsFor Ns = for the mount- and key-loading unit.
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.
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.It Sy org.openzfs.systemd:before Ns = Ns Pa unit Ns Oo " " Ns Pa unit Oc Ns …
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.No Sets Sy Before Ns = for the mount unit.
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.
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.It Sy org.openzfs.systemd:after Ns = Ns Pa unit Ns Oo " " Ns Pa unit Oc Ns …
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.No Sets Sy After Ns = for the mount unit.
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.
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.It Sy org.openzfs.systemd:wanted-by Ns = Ns Pa unit Ns Oo " " Ns Pa unit Oc Ns …
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.No Sets logical Em noauto No flag (see below).
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.No If not Sy none , No sets Sy WantedBy Ns = for the mount unit.
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.It Sy org.openzfs.systemd:required-by Ns = Ns Pa unit Ns Oo " " Ns Pa unit Oc Ns …
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.No Sets logical Em noauto No flag (see below).
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.No If not Sy none , No sets Sy RequiredBy Ns = for the mount unit.
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.
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.It Sy org.openzfs.systemd:nofail Ns = Ns (unset) Ns | Ns Sy on Ns | Ns Sy off
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Waxes or wanes strength of default reverse dependencies of the mount unit, see below.
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.
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.It Sy org.openzfs.systemd:ignore Ns = Ns Sy on Ns | Ns Sy off
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.No Skip if Sy on .
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.No Defaults to Sy off .
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.El
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.
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.Ss Unit Ordering And Dependencies
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Additionally, unless the pool the dataset resides on
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is imported at generation time, both units gain
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.Sy Wants Ns = Ns Pa zfs-import.target
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and
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.Sy After Ns = Ns Pa zfs-import.target .
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.Pp
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Additionally, unless the logical
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.Em noauto
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flag is set, the mount unit gains a reverse-dependency for
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.Pa local-fs.target
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of strength
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.Bl -tag -compact -offset Ds -width "(unset)"
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.It (unset)
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.Sy WantedBy Ns = No + Sy Before Ns =
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.It Sy on
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.Sy WantedBy Ns =
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.It Sy off
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.Sy RequiredBy Ns = No + Sy Before Ns =
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.El
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.
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.Ss Cache File
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Because ZFS pools may not be available very early in the boot process,
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information on ZFS mountpoints must be stored separately.
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The output of
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.Dl Nm zfs Cm list Fl Ho Ar name , Ns Aq every property above in order
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for datasets that should be mounted by systemd should be kept at
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.Pa @sysconfdir@/zfs/zfs-list.cache/ Ns Ar poolname ,
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and, if writeable, will be kept synchronized for the entire pool by the
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.Pa history_event-zfs-list-cacher.sh
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ZEDLET, if enabled
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.Pq see Xr zed 8 .
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.
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.Sh ENVIRONMENT
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The
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.Sy ZFS_DEBUG
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environment variable can either be
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.Sy 0
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(default),
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.Sy 1
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(print summary accounting information at the end), or at least
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.Sy 2
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(print accounting information for each subprocess as it finishes).
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.
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If not present,
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.Pa /proc/cmdline
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is additionally checked for
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.Qq debug ,
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in which case the debug level is set to
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.Sy 2 .
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.
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.Sh EXAMPLES
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To begin, enable tracking for the pool:
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.Dl # Nm touch Pa @sysconfdir@/zfs/zfs-list.cache/ Ns Ar poolname
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Then enable the tracking ZEDLET:
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.Dl # Nm ln Fl s Pa @zfsexecdir@/zed.d/history_event-zfs-list-cacher.sh @sysconfdir@/zfs/zed.d
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.Dl # Nm systemctl Cm enable Pa zfs-zed.service
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.Dl # Nm systemctl Cm restart Pa zfs-zed.service
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.Pp
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If no history event is in the queue,
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inject one to ensure the ZEDLET runs to refresh the cache file
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by setting a monitored property somewhere on the pool:
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.Dl # Nm zfs Cm set Sy relatime Ns = Ns Sy off Ar poolname/dset
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.Dl # Nm zfs Cm inherit Sy relatime Ar poolname/dset
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.Pp
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To test the generator output:
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.Dl $ Nm mkdir Pa /tmp/zfs-mount-generator
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.Dl $ Nm @systemdgeneratordir@/zfs-mount-generator Pa /tmp/zfs-mount-generator
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.
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If the generated units are satisfactory, instruct
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.Nm systemd
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to re-run all generators:
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.Dl # Nm systemctl daemon-reload
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.
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.Sh SEE ALSO
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.Xr systemd.mount 5 ,
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.Xr systemd.target 5 ,
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.Xr zfs 5 ,
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.Xr zfs-events 5 ,
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.Xr systemd.generator 7 ,
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.Xr systemd.special 7 ,
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.Xr zed 8
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