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etc/systemd/zfs-mount-generator: rewrite in C
A plain rewrite of the shell version, and generates identical units, save for replacing some empty lines with nothing, having fewer meaningless spaces in After=s and different spacing in the lock scripts, for a clean git diff -w This is a gain of anywhere from 0m0.336s vs 0m0.022s (15.27x) to 0m0.202s vs 0m0.006s (33.67x), depending on the hardware, a.k.a. from "absolutely unusable" to "perfectly fine" This also properly deals with canmount=noauto units across multiple pools See PR for detailed timings (of an early version) and diffs Reviewed-by: Antonio Russo <aerusso@aerusso.net> Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: InsanePrawn <insane.prawny@gmail.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz> Issue #11915 Closes #11917
This commit is contained in:
наб
Brian Behlendorf
parent
0bb736ce0b
commit
5a1fb060fd
@ -6,7 +6,7 @@ SUBDIRS += rpm
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endif
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if CONFIG_USER
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SUBDIRS += etc man scripts lib tests cmd contrib
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SUBDIRS += man scripts lib tests cmd etc contrib
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if BUILD_LINUX
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SUBDIRS += udev
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endif
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@ -1,6 +1,14 @@
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include $(top_srcdir)/config/Substfiles.am
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include $(top_srcdir)/config/Rules.am
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systemdgenerator_SCRIPTS = \
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systemdgenerator_PROGRAMS = \
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zfs-mount-generator
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SUBSTFILES += $(systemdgenerator_SCRIPTS)
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zfs_mount_generator_SOURCES = \
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zfs-mount-generator.c
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zfs_mount_generator_LDADD = \
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$(abs_top_builddir)/lib/libzfs/libzfs.la
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zfs_mount_generator_LDFLAGS = -pthread
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include $(top_srcdir)/config/CppCheck.am
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1089
etc/systemd/system-generators/zfs-mount-generator.c
Normal file
1089
etc/systemd/system-generators/zfs-mount-generator.c
Normal file
File diff suppressed because it is too large
Load Diff
@ -1,474 +0,0 @@
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#!/bin/sh
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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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# "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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set -e
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FSLIST="@sysconfdir@/zfs/zfs-list.cache"
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[ -d "${FSLIST}" ] || exit 0
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[ "$(echo "${FSLIST}"/*)" = "${FSLIST}/*" ] && exit 0
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do_fail() {
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printf 'zfs-mount-generator: %s\n' "$*" > /dev/kmsg
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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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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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IFS=' '
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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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elif [ $# -eq 3 ] ; then
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dest_norm="${1}"
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else
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do_fail "zero or three arguments required"
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fi
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pools=$(zpool list -H -o name || true)
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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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# cached in $FSLIST, and each line is processed by the following function:
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# See the list below for the properties and their order
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process_line() {
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# zfs list -H -o name,...
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# fields are tab separated
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IFS="$(printf '\t')"
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# shellcheck disable=SC2086
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set -- $1
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dataset="${1}"
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pool="${dataset%%/*}"
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p_mountpoint="${2}"
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p_canmount="${3}"
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p_atime="${4}"
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p_relatime="${5}"
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p_devices="${6}"
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p_exec="${7}"
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p_readonly="${8}"
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p_setuid="${9}"
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p_nbmand="${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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bindsto=""
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wantedby=""
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requiredby=""
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noauto="off"
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# If the pool is already imported, zfs-import.target is not needed. This
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# avoids a dependency loop on root-on-ZFS systems:
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# systemd-random-seed.service After (via RequiresMountsFor) var-lib.mount
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# After zfs-import.target After zfs-import-{cache,scan}.service After
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# cryptsetup.service After systemd-random-seed.service.
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#
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# Pools are newline-separated and may contain spaces in their names.
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# There is no better portable way to set IFS to just a newline. Using
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# $(printf '\n') doesn't work because $(...) strips trailing newlines.
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IFS="
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"
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for p in $pools ; do
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if [ "$p" = "$pool" ] ; then
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after=""
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wants=""
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break
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fi
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done
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if [ -n "${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}" = "${dataset}" ] ; then
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keymountdep=""
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if [ "${p_keyloc%%://*}" = "file" ] ; then
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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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keyloadscript="@sbindir@/zfs load-key \"${dataset}\""
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elif [ "${p_keyloc}" = "prompt" ] ; then
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keyloadscript="\
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count=0;\
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while [ \$\$count -lt 3 ];do\
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systemd-ask-password --id=\"zfs:${dataset}\"\
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\"Enter passphrase for ${dataset}:\"|\
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@sbindir@/zfs load-key \"${dataset}\" && exit 0;\
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count=\$\$((count + 1));\
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done;\
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exit 1"
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else
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printf 'zfs-mount-generator: (%s) invalid keylocation\n' \
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"${dataset}" >/dev/kmsg
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fi
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keyloadcmd="\
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/bin/sh -c '\
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set -eu;\
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keystatus=\"\$\$(@sbindir@/zfs get -H -o value keystatus \"${dataset}\")\";\
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[ \"\$\$keystatus\" = \"unavailable\" ] || exit 0;\
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${keyloadscript}'"
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keyunloadcmd="\
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/bin/sh -c '\
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set -eu;\
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keystatus=\"\$\$(@sbindir@/zfs get -H -o value keystatus \"${dataset}\")\";\
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[ \"\$\$keystatus\" = \"available\" ] || exit 0;\
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@sbindir@/zfs unload-key \"${dataset}\"'"
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# Generate the key-load .service unit
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#
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# Note: It is tempting to use a `<<EOF` style here-document for this, but
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# bash requires a writable /tmp or $TMPDIR for that. This is not always
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# available early during boot.
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#
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echo \
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"# Automatically generated by zfs-mount-generator
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[Unit]
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Description=Load ZFS key for ${dataset}
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SourcePath=${cachefile}
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Documentation=man:zfs-mount-generator(8)
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DefaultDependencies=no
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Wants=${wants}
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After=${after}
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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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RemainAfterExit=yes
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# This avoids a dependency loop involving systemd-journald.socket if this
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# dataset is a parent of the root filesystem.
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StandardOutput=null
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StandardError=null
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ExecStart=${keyloadcmd}
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ExecStop=${keyunloadcmd}" > "${dest_norm}/${keyloadunit}"
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fi
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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="${wants}"
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bindsto="BindsTo=${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 [ "${p_canmount}" = "noauto" ] ; then
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noauto="on"
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elif [ "${p_canmount}" = "on" ] ; then
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: # This is OK
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else
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do_fail "invalid canmount for ${dataset}"
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fi
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# Check for legacy and blank mountpoints.
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if [ "${p_mountpoint}" = "legacy" ] ; then
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return
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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 for ${dataset}"
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fi
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# Escape the mountpoint per systemd policy.
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mountfile="$(systemd-escape --path --suffix=mount "${p_mountpoint}")"
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# Parse options
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# see lib/libzfs/libzfs_mount.c:zfs_add_options
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opts=""
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# atime
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if [ "${p_atime}" = on ] ; then
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# relatime
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if [ "${p_relatime}" = on ] ; then
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opts="${opts},atime,relatime"
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elif [ "${p_relatime}" = off ] ; then
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opts="${opts},atime,strictatime"
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else
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printf 'zfs-mount-generator: (%s) invalid relatime\n' \
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"${dataset}" >/dev/kmsg
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fi
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elif [ "${p_atime}" = off ] ; then
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opts="${opts},noatime"
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else
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printf 'zfs-mount-generator: (%s) invalid atime\n' \
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"${dataset}" >/dev/kmsg
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fi
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# devices
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if [ "${p_devices}" = on ] ; then
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opts="${opts},dev"
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elif [ "${p_devices}" = off ] ; then
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opts="${opts},nodev"
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else
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printf 'zfs-mount-generator: (%s) invalid devices\n' \
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"${dataset}" >/dev/kmsg
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fi
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# exec
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if [ "${p_exec}" = on ] ; then
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opts="${opts},exec"
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elif [ "${p_exec}" = off ] ; then
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opts="${opts},noexec"
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else
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printf 'zfs-mount-generator: (%s) invalid exec\n' \
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"${dataset}" >/dev/kmsg
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fi
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# readonly
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if [ "${p_readonly}" = on ] ; then
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opts="${opts},ro"
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elif [ "${p_readonly}" = off ] ; then
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opts="${opts},rw"
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else
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printf 'zfs-mount-generator: (%s) invalid readonly\n' \
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"${dataset}" >/dev/kmsg
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fi
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# setuid
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if [ "${p_setuid}" = on ] ; then
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opts="${opts},suid"
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elif [ "${p_setuid}" = off ] ; then
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opts="${opts},nosuid"
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else
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printf 'zfs-mount-generator: (%s) invalid setuid\n' \
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"${dataset}" >/dev/kmsg
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fi
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# nbmand
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if [ "${p_nbmand}" = on ] ; then
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opts="${opts},mand"
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elif [ "${p_nbmand}" = off ] ; then
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opts="${opts},nomand"
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else
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printf 'zfs-mount-generator: (%s) invalid nbmand\n' \
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"${dataset}" >/dev/kmsg
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fi
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if [ -n "${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 $noauto_files to track the unit file names
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# (which are the systemd-escaped mountpoints) of all (exclusively)
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# noauto datasets that had a file created.
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# 4. If the file to be created is found in the tracking variable,
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# we do NOT create it.
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# 5. If a file exists for a noauto dataset, we check whether the file
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# name is in the variable. If it is, we have multiple noauto datasets
|
||||
# for the same mountpoint. In such cases, we remove the file for safety.
|
||||
# To avoid further noauto datasets creating a file for this path again,
|
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# we leave the file name in the tracking variable.
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if [ -e "${dest_norm}/${mountfile}" ] ; then
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if is_known "$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
|
||||
# don't log for canmount=noauto
|
||||
if [ "${p_canmount}" = "on" ] ; then
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printf 'zfs-mount-generator: %s already exists. Skipping.\n' \
|
||||
"${mountfile}" >/dev/kmsg
|
||||
fi
|
||||
fi
|
||||
# file exists; Skip current dataset.
|
||||
return
|
||||
else
|
||||
if is_known "${mountfile}" "${noauto_files}" ; then
|
||||
# See 4.
|
||||
return
|
||||
elif [ "${p_canmount}" = "noauto" ] ; then
|
||||
noauto_files="${mountfile} ${noauto_files}"
|
||||
fi
|
||||
fi
|
||||
|
||||
# Create the .mount unit file.
|
||||
#
|
||||
# (Do not use `<<EOF`-style here-documents for this, see warning above)
|
||||
#
|
||||
echo \
|
||||
"# Automatically generated by zfs-mount-generator
|
||||
|
||||
[Unit]
|
||||
SourcePath=${cachefile}
|
||||
Documentation=man:zfs-mount-generator(8)
|
||||
|
||||
Before=${before}
|
||||
After=${after}
|
||||
Wants=${wants}
|
||||
${bindsto}
|
||||
${requires}
|
||||
${requiredmounts}
|
||||
|
||||
[Mount]
|
||||
Where=${p_mountpoint}
|
||||
What=${dataset}
|
||||
Type=zfs
|
||||
Options=defaults${opts},zfsutil" > "${dest_norm}/${mountfile}"
|
||||
|
||||
# Finally, create the appropriate dependencies
|
||||
create_dependencies "${mountfile}" "wants" "$wantedby"
|
||||
create_dependencies "${mountfile}" "requires" "$requiredby"
|
||||
|
||||
}
|
||||
|
||||
for cachefile in "${FSLIST}/"* ; do
|
||||
# Disable glob expansion to protect against special characters when parsing.
|
||||
set -f
|
||||
# Sort cachefile's lines by canmount, "on" before "noauto"
|
||||
# and feed each line into process_line
|
||||
sort -t "$(printf '\t')" -k 3 -r "${cachefile}" | \
|
||||
( # subshell is necessary for `sort|while read` and $noauto_files
|
||||
noauto_files=""
|
||||
while read -r fs ; do
|
||||
process_line "${fs}"
|
||||
done
|
||||
)
|
||||
done
|
||||
@ -22,7 +22,7 @@
|
||||
.\" OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
|
||||
.\" WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
||||
|
||||
.TH ZFS-MOUNT-GENERATOR 8 "Aug 24, 2020" OpenZFS
|
||||
.TH ZFS-MOUNT-GENERATOR 8 "Apr 19, 2021" OpenZFS
|
||||
|
||||
.SH "NAME"
|
||||
zfs\-mount\-generator \- generates systemd mount units for ZFS
|
||||
@ -83,19 +83,13 @@ zfs list -H -o name,mountpoint,canmount,atime,relatime,devices,exec,readonly,set
|
||||
.RE
|
||||
.PP
|
||||
for datasets that should be mounted by systemd, should be kept
|
||||
separate from the pool, at
|
||||
.PP
|
||||
.RS 4
|
||||
.RI @sysconfdir@/zfs/zfs-list.cache/ POOLNAME
|
||||
.
|
||||
.RE
|
||||
separate from the pool at
|
||||
.RI @sysconfdir@/zfs/zfs-list.cache/ POOLNAME .
|
||||
.PP
|
||||
The cache file, if writeable, will be kept synchronized with the pool
|
||||
state by the ZEDLET
|
||||
.PP
|
||||
.RS 4
|
||||
history_event-zfs-list-cacher.sh .
|
||||
.RE
|
||||
state by the
|
||||
.I history_event-zfs-list-cacher.sh
|
||||
ZEDLET.
|
||||
.PP
|
||||
.sp
|
||||
.SS PROPERTIES
|
||||
@ -189,6 +183,17 @@ See also
|
||||
.BR systemd.mount (5)
|
||||
|
||||
.PP
|
||||
.SH ENVIRONMENT
|
||||
The
|
||||
.BR $ZFS_DEBUG
|
||||
environment variable, which can either be 0 (default),
|
||||
1 (print summary accounting information at the end),
|
||||
or at least 2 (print accounting information for each subprocess as it finishes).
|
||||
|
||||
If not present, /proc/cmdline is additionally checked for
|
||||
.BR debug ,
|
||||
in which case the debug level is set to 2.
|
||||
|
||||
.SH EXAMPLE
|
||||
To begin, enable tracking for the pool:
|
||||
.PP
|
||||
@ -221,7 +226,7 @@ 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 . .
|
||||
@systemdgeneratordir@/zfs-mount-generator /tmp/zfs-mount-generator
|
||||
.RE
|
||||
.PP
|
||||
This will generate units and dependencies in
|
||||
|
||||
Loading…
Reference in New Issue
Block a user