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Properly use the Dracut cleanup hook to order pool shutdown

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When Dracut starts up, it needs to determine whether a pool will remain
"hanging open" before the system shuts off. In such a case, then the
code to clean up the pool (using the previous export -F work) must
be invoked. Since Dracut has had a recent change that makes
mount-zfs.sh simply not run when the root dataset is already mounted,
we must use the cleanup hook to order Dracut to do shutdown cleanup.

Important note: this code will not accomplish its stated goal until this
bug is fixed: https://bugzilla.redhat.com/show_bug.cgi?id=1385432

That bug impacts more than just ZFS. It impacts LUKS, dmraid, and
unmount during poweroff. It is a Fedora-wide bug.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Manuel Amador (Rudd-O) <rudd-o@rudd-o.com>
Closes #5287
This commit is contained in:
Rudd-O 2016-10-17 18:51:15 +00:00 committed by Brian Behlendorf
parent fea33e4e50
commit f8e87e205c
4 changed files with 13 additions and 2 deletions
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2
contrib/dracut/90zfs/Makefile.am
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@ -5,6 +5,7 @@ pkgdracut_SCRIPTS = \
mount-zfs.sh \
parse-zfs.sh \
zfs-generator.sh \
zfs-needshutdown.sh \
zfs-lib.sh
EXTRA_DIST = \
@ -13,6 +14,7 @@ EXTRA_DIST = \
$(top_srcdir)/contrib/dracut/90zfs/mount-zfs.sh.in \
$(top_srcdir)/contrib/dracut/90zfs/parse-zfs.sh.in \
$(top_srcdir)/contrib/dracut/90zfs/zfs-generator.sh.in \
$(top_srcdir)/contrib/dracut/90zfs/zfs-needshutdown.sh.in \
$(top_srcdir)/contrib/dracut/90zfs/zfs-lib.sh.in
$(pkgdracut_SCRIPTS):%:%.in

1
contrib/dracut/90zfs/module-setup.sh.in
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@ -58,6 +58,7 @@ install() {
inst_script "${moddir}/zfs-generator.sh" "$systemdutildir"/system-generators/dracut-zfs-generator
fi
inst_hook mount 98 "${moddir}/mount-zfs.sh"
inst_hook cleanup 99 "${moddir}/zfs-needshutdown.sh"
inst_hook shutdown 20 "${moddir}/export-zfs.sh"
inst_simple "${moddir}/zfs-lib.sh" "/lib/dracut-zfs-lib.sh"

2
contrib/dracut/90zfs/mount-zfs.sh.in
View File

@ -22,7 +22,6 @@ if [ -e "$GENERATOR_FILE" -a -e "$GENERATOR_EXTENSION" ] ; then
# Let us tell the initrd to run on shutdown.
# We have a shutdown hook to run
# because we imported the pool.
need_shutdown
# We now prevent Dracut from running this thing again.
for zfsmounthook in "$hookdir"/mount/*zfs* ; do
if [ -f "$zfsmounthook" ] ; then
@ -60,7 +59,6 @@ if import_pool "${ZFS_POOL}" ; then
# Let us tell the initrd to run on shutdown.
# We have a shutdown hook to run
# because we imported the pool.
need_shutdown
info "ZFS: Mounting dataset ${ZFS_DATASET}..."
if mount_dataset "${ZFS_DATASET}" ; then
ROOTFS_MOUNTED=yes

10
contrib/dracut/90zfs/zfs-needshutdown.sh.in Normal file
View File

@ -0,0 +1,10 @@
#!/bin/sh
type getarg >/dev/null 2>&1 || . /lib/dracut-lib.sh
if zpool list 2>&1 | grep -q 'no pools available' ; then
info "ZFS: No active pools, no need to export anything."
else
info "ZFS: There is an active pool, will export it."
need_shutdown
fi