Control: tags -1 patch
I have a proposed generic framework to support mounting additional kernel
filesystems. I have added support for debugfs and cgroup2 but omitted cgroup.
None are enabled by default.
Comments welcome. Thanks.
Mark
diff --git a/debian/src/initscripts/etc/default/rcS
b/debian/src/initscripts/etc/default/rcS
index 4778c85c..197959ba 100644
--- a/debian/src/initscripts/etc/default/rcS
+++ b/debian/src/initscripts/etc/default/rcS
@@ -31,3 +31,7 @@
# Mount NFS filesystem asynchronously
#ASYNCMOUNTNFS=yes
+
+# Additional (optional) kernel filesystems to mount. Options are debugfs,
+# and cgroup2.
+#EXTRAKERNELFS=
diff --git a/debian/src/initscripts/etc/init.d/mountkernfs.sh
b/debian/src/initscripts/etc/init.d/mountkernfs.sh
index 353ef048..a0c901aa 100755
--- a/debian/src/initscripts/etc/init.d/mountkernfs.sh
+++ b/debian/src/initscripts/etc/init.d/mountkernfs.sh
@@ -60,6 +60,29 @@ mount_filesystems () {
# domount is a no-op if already mounted
domount "$MNTMODE" efivarfs "" $efivarsmnt none ""
fi
+
+ #
+ # Mount specific additional requests
+ #
+ for fs in $EXTRAKERNELFS ; do
+ case $fs in
+ debugfs)
+ if grep -wqs 'debugfs$' /proc/filesystems && [
-d /sys/kernel/debug ] ; then
+ domount "$MNTMODE" debugfs ""
/sys/kernel/debug debugfs -onodev,noexec,nosuid
+ else
+ echo "Warning: ignoring unavailable
debugfs" >&2
+ fi
+ ;;
+ cgroup2)
+ if grep -wqs 'cgroup2$' /proc/filesystems && [
-e /proc/cgroups ] ; then
+ domount "$MNTMOUDE" cgroup2 ""
/sys/fs/cgroup cgroup2 -onodev,noexec,nosuid
+ else
+ echo "Warning: ignoring unavailable
cgroup2" >&2
+ fi
+ ;;
+ *) echo "Warning: ignoring unsupported kernel
filesystem $fs" >&2 ;;
+ esac
+ done
}
case "$1" in
diff --git a/debian/src/initscripts/man/rcS.5 b/debian/src/initscripts/man/rcS.5
index b9d384e1..f1e6961d 100644
--- a/debian/src/initscripts/man/rcS.5
+++ b/debian/src/initscripts/man/rcS.5
@@ -91,6 +91,10 @@ marked 'auto'
.RB ( NOT " 'allow\-hotplug')"
in \fB/etc/network/interfaces\fP.
+.IP \fBEXTRAKERNELFS\fP
+A space separated list of additional optional kernel filesystems to mount. The
+current available options are \fBdebugfs\fP and \fBcgroup2\fP.
+
.SH NOTE
The \fBEDITMOTD\fP, \fBRAMRUN\fP, \fBCONCURRENCY\fP and \fBUTC\fP variables are
no longer used. To inhibit concurrent boot, use
