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systemd mount generator and tracking ZEDLET

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zfs-mount-generator implements the "systemd generator" protocol,
producing systemd.mount units from the cached outputs of zfs list,
during early boot, integrating with systemd.

Each pool has an indpendent cache of the command

  zfs list -H -oname,mountpoint,canmount -tfilesystem -r $pool

which is kept synchronized by the ZEDLET

  history_event-zfs-list-cacher.sh

Datasets not in the cache will be loaded later in the boot process by
zfs-mount.service, including pools without a cache.

Among other things, this allows for complex mount hierarchies.

Reviewed-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
Reviewed-by: Richard Laager <rlaager@wiktel.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Antonio Russo <antonio.e.russo@gmail.com>
Closes #7329
This commit is contained in:
Antonio Russo
2018-04-06 17:11:09 -04:00
committed by Brian Behlendorf
parent 5c27ec1088
commit 55d80e651a
12 changed files with 282 additions and 3 deletions
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config/user-systemd.m4
+7 -1
View File
@@ -20,6 +20,11 @@ AC_DEFUN([ZFS_AC_CONFIG_USER_SYSTEMD], [
[install systemd module load files into dir [[/usr/lib/modules-load.d]]]),
systemdmoduleloaddir=$withval,systemdmodulesloaddir=/usr/lib/modules-load.d)
AC_ARG_WITH(systemdgeneratordir,
AC_HELP_STRING([--with-systemdgeneratordir=DIR],
[install systemd generators in dir [[/usr/lib/systemd/system-generators]]]),
systemdgeneratordir=$withval,systemdgeneratordir=/usr/lib/systemd/system-generators)
AS_IF([test "x$enable_systemd" = xcheck], [
AS_IF([systemctl --version >/dev/null 2>&1],
[enable_systemd=yes],
@@ -32,7 +37,7 @@ AC_DEFUN([ZFS_AC_CONFIG_USER_SYSTEMD], [
AS_IF([test "x$enable_systemd" = xyes], [
ZFS_INIT_SYSTEMD=systemd
ZFS_MODULE_LOAD=modules-load.d
DEFINE_SYSTEMD='--with systemd --define "_unitdir $(systemdunitdir)" --define "_presetdir $(systemdpresetdir)"'
DEFINE_SYSTEMD='--with systemd --define "_unitdir $(systemdunitdir)" --define "_presetdir $(systemdpresetdir)" --define "_generatordir $(systemdgeneratordir)"'
modulesloaddir=$systemdmodulesloaddir
],[
DEFINE_SYSTEMD='--without systemd'
@@ -43,5 +48,6 @@ AC_DEFUN([ZFS_AC_CONFIG_USER_SYSTEMD], [
AC_SUBST(DEFINE_SYSTEMD)
AC_SUBST(systemdunitdir)
AC_SUBST(systemdpresetdir)
AC_SUBST(systemdgeneratordir)
AC_SUBST(modulesloaddir)
])