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libvirt/SOURCES/libvirt-vircgroup-introduce...

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From 8b35858852e5c170410d4462fdf2bb19659b8894 Mon Sep 17 00:00:00 2001
Message-Id: <8b35858852e5c170410d4462fdf2bb19659b8894@dist-git>
From: Pavel Hrdina <phrdina@redhat.com>
Date: Mon, 1 Jul 2019 17:08:09 +0200
Subject: [PATCH] vircgroup: introduce virCgroupKillRecursiveCB
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
The rewrite to support cgroup v2 missed this function. In cgroup v2
we have different files to track tasks.
We would fail to remove cgroup on non-systemd OSes if there is any
extra process assigned to guest cgroup because we would not kill any
process form the guest cgroup.
Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
(cherry picked from commit b532546823fde032fe827d41735a0d591c3bc0b8)
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1689297
Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
Message-Id: <2414a178eb8aba977e7369bba0b37a18cdfec654.1561993100.git.phrdina@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
---
src/util/vircgroup.c | 69 ++++++++++++++++++++-----------------
src/util/vircgroupbackend.h | 7 ++++
src/util/vircgrouppriv.h | 8 +++++
src/util/vircgroupv1.c | 16 +++++++++
src/util/vircgroupv2.c | 16 +++++++++
5 files changed, 84 insertions(+), 32 deletions(-)
diff --git a/src/util/vircgroup.c b/src/util/vircgroup.c
index 069f1ae396..736b5043a8 100644
--- a/src/util/vircgroup.c
+++ b/src/util/vircgroup.c
@@ -2431,33 +2431,15 @@ virCgroupRemove(virCgroupPtr group)
}
-static int
-virCgroupPathOfAnyController(virCgroupPtr group,
- const char *name,
- char **keypath)
-{
- size_t i;
- int controller;
-
- for (i = 0; i < VIR_CGROUP_BACKEND_TYPE_LAST; i++) {
- if (group->backends[i]) {
- controller = group->backends[i]->getAnyController(group);
- if (controller >= 0)
- return virCgroupPathOfController(group, controller, name, keypath);
- }
- }
-
- virReportSystemError(ENOSYS, "%s",
- _("No controllers are mounted"));
- return -1;
-}
-
-
/*
* Returns 1 if some PIDs are killed, 0 if none are killed, or -1 on error
*/
static int
-virCgroupKillInternal(virCgroupPtr group, int signum, virHashTablePtr pids)
+virCgroupKillInternal(virCgroupPtr group,
+ int signum,
+ virHashTablePtr pids,
+ int controller,
+ const char *taskFile)
{
int ret = -1;
bool killedAny = false;
@@ -2467,7 +2449,7 @@ virCgroupKillInternal(virCgroupPtr group, int signum, virHashTablePtr pids)
VIR_DEBUG("group=%p path=%s signum=%d pids=%p",
group, group->path, signum, pids);
- if (virCgroupPathOfAnyController(group, "tasks", &keypath) < 0)
+ if (virCgroupPathOfController(group, controller, taskFile, &keypath) < 0)
return -1;
/* PIDs may be forking as we kill them, so loop
@@ -2553,10 +2535,12 @@ virCgroupPidCopy(const void *name)
}
-static int
+int
virCgroupKillRecursiveInternal(virCgroupPtr group,
int signum,
virHashTablePtr pids,
+ int controller,
+ const char *taskFile,
bool dormdir)
{
int ret = -1;
@@ -2570,11 +2554,13 @@ virCgroupKillRecursiveInternal(virCgroupPtr group,
VIR_DEBUG("group=%p path=%s signum=%d pids=%p",
group, group->path, signum, pids);
- if (virCgroupPathOfAnyController(group, "", &keypath) < 0)
+ if (virCgroupPathOfController(group, controller, "", &keypath) < 0)
return -1;
- if ((rc = virCgroupKillInternal(group, signum, pids)) < 0)
+ if ((rc = virCgroupKillInternal(group, signum, pids,
+ controller, taskFile)) < 0) {
goto cleanup;
+ }
if (rc == 1)
killedAny = true;
@@ -2598,7 +2584,7 @@ virCgroupKillRecursiveInternal(virCgroupPtr group,
goto cleanup;
if ((rc = virCgroupKillRecursiveInternal(subgroup, signum, pids,
- true)) < 0)
+ controller, taskFile, true)) < 0)
goto cleanup;
if (rc == 1)
killedAny = true;
@@ -2624,8 +2610,10 @@ virCgroupKillRecursiveInternal(virCgroupPtr group,
int
virCgroupKillRecursive(virCgroupPtr group, int signum)
{
- int ret;
- VIR_DEBUG("group=%p path=%s signum=%d", group, group->path, signum);
+ int ret = 0;
+ int rc;
+ size_t i;
+ virCgroupBackendPtr *backends = virCgroupBackendGetAll();
virHashTablePtr pids = virHashCreateFull(100,
NULL,
virCgroupPidCode,
@@ -2633,10 +2621,27 @@ virCgroupKillRecursive(virCgroupPtr group, int signum)
virCgroupPidCopy,
NULL);
- ret = virCgroupKillRecursiveInternal(group, signum, pids, false);
+ VIR_DEBUG("group=%p path=%s signum=%d", group, group->path, signum);
+ if (!backends) {
+ ret = -1;
+ goto cleanup;
+ }
+
+ for (i = 0; i < VIR_CGROUP_BACKEND_TYPE_LAST; i++) {
+ if (backends[i]) {
+ rc = backends[i]->killRecursive(group, signum, pids);
+ if (rc < 0) {
+ ret = -1;
+ goto cleanup;
+ }
+ if (rc > 0)
+ ret = rc;
+ }
+ }
+
+ cleanup:
virHashFree(pids);
-
return ret;
}
diff --git a/src/util/vircgroupbackend.h b/src/util/vircgroupbackend.h
index bc60b44643..a825dc4be7 100644
--- a/src/util/vircgroupbackend.h
+++ b/src/util/vircgroupbackend.h
@@ -24,6 +24,7 @@
# include "internal.h"
# include "vircgroup.h"
+# include "virhash.h"
# define CGROUP_MAX_VAL 512
@@ -128,6 +129,11 @@ typedef int
(*virCgroupHasEmptyTasksCB)(virCgroupPtr cgroup,
int controller);
+typedef int
+(*virCgroupKillRecursiveCB)(virCgroupPtr group,
+ int signum,
+ virHashTablePtr pids);
+
typedef int
(*virCgroupBindMountCB)(virCgroupPtr group,
const char *oldroot,
@@ -370,6 +376,7 @@ struct _virCgroupBackend {
virCgroupRemoveCB remove;
virCgroupAddTaskCB addTask;
virCgroupHasEmptyTasksCB hasEmptyTasks;
+ virCgroupKillRecursiveCB killRecursive;
virCgroupBindMountCB bindMount;
virCgroupSetOwnerCB setOwner;
diff --git a/src/util/vircgrouppriv.h b/src/util/vircgrouppriv.h
index 8f24b0891e..6067f5cdc8 100644
--- a/src/util/vircgrouppriv.h
+++ b/src/util/vircgrouppriv.h
@@ -123,4 +123,12 @@ int virCgroupNewDomainPartition(virCgroupPtr partition,
int virCgroupRemoveRecursively(char *grppath);
+
+int virCgroupKillRecursiveInternal(virCgroupPtr group,
+ int signum,
+ virHashTablePtr pids,
+ int controller,
+ const char *taskFile,
+ bool dormdir);
+
#endif /* __VIR_CGROUP_PRIV_H__ */
diff --git a/src/util/vircgroupv1.c b/src/util/vircgroupv1.c
index 3147084f21..7098dc5644 100644
--- a/src/util/vircgroupv1.c
+++ b/src/util/vircgroupv1.c
@@ -758,6 +758,21 @@ virCgroupV1HasEmptyTasks(virCgroupPtr cgroup,
}
+static int
+virCgroupV1KillRecursive(virCgroupPtr group,
+ int signum,
+ virHashTablePtr pids)
+{
+ int controller = virCgroupV1GetAnyController(group);
+
+ if (controller < 0)
+ return -1;
+
+ return virCgroupKillRecursiveInternal(group, signum, pids, controller,
+ "tasks", false);
+}
+
+
static char *
virCgroupV1IdentifyRoot(virCgroupPtr group)
{
@@ -2042,6 +2057,7 @@ virCgroupBackend virCgroupV1Backend = {
.remove = virCgroupV1Remove,
.addTask = virCgroupV1AddTask,
.hasEmptyTasks = virCgroupV1HasEmptyTasks,
+ .killRecursive = virCgroupV1KillRecursive,
.bindMount = virCgroupV1BindMount,
.setOwner = virCgroupV1SetOwner,
diff --git a/src/util/vircgroupv2.c b/src/util/vircgroupv2.c
index bff2f78d7e..5652fcfffb 100644
--- a/src/util/vircgroupv2.c
+++ b/src/util/vircgroupv2.c
@@ -463,6 +463,21 @@ virCgroupV2HasEmptyTasks(virCgroupPtr cgroup,
}
+static int
+virCgroupV2KillRecursive(virCgroupPtr group,
+ int signum,
+ virHashTablePtr pids)
+{
+ int controller = virCgroupV2GetAnyController(group);
+
+ if (controller < 0)
+ return -1;
+
+ return virCgroupKillRecursiveInternal(group, signum, pids, controller,
+ "cgroup.threads", false);
+}
+
+
static int
virCgroupV2BindMount(virCgroupPtr group,
const char *oldroot,
@@ -1559,6 +1574,7 @@ virCgroupBackend virCgroupV2Backend = {
.remove = virCgroupV2Remove,
.addTask = virCgroupV2AddTask,
.hasEmptyTasks = virCgroupV2HasEmptyTasks,
+ .killRecursive = virCgroupV2KillRecursive,
.bindMount = virCgroupV2BindMount,
.setOwner = virCgroupV2SetOwner,
--
2.22.0
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