[libvirt] [PATCH 19/47] vircgroup: extract virCgroupV1BindMount
Pavel Hrdina
phrdina at redhat.com
Tue Sep 18 15:45:40 UTC 2018
Signed-off-by: Pavel Hrdina <phrdina at redhat.com>
---
src/util/vircgroup.c | 102 +-------------------------------
src/util/vircgroupbackend.h | 6 ++
src/util/vircgroupv1.c | 113 ++++++++++++++++++++++++++++++++++++
3 files changed, 120 insertions(+), 101 deletions(-)
diff --git a/src/util/vircgroup.c b/src/util/vircgroup.c
index f5ae23836f..29faf5fb2c 100644
--- a/src/util/vircgroup.c
+++ b/src/util/vircgroup.c
@@ -3181,35 +3181,6 @@ virCgroupKillPainfully(virCgroupPtr group)
}
-static char *
-virCgroupIdentifyRoot(virCgroupPtr group)
-{
- char *ret = NULL;
- size_t i;
-
- for (i = 0; i < VIR_CGROUP_CONTROLLER_LAST; i++) {
- char *tmp;
- if (!group->controllers[i].mountPoint)
- continue;
- if (!(tmp = strrchr(group->controllers[i].mountPoint, '/'))) {
- virReportError(VIR_ERR_INTERNAL_ERROR,
- _("Could not find directory separator in %s"),
- group->controllers[i].mountPoint);
- return NULL;
- }
-
- if (VIR_STRNDUP(ret, group->controllers[i].mountPoint,
- tmp - group->controllers[i].mountPoint) < 0)
- return NULL;
- return ret;
- }
-
- virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
- _("Could not find any mounted controllers"));
- return NULL;
-}
-
-
/**
* virCgroupGetCpuCfsQuota:
*
@@ -3304,78 +3275,7 @@ int
virCgroupBindMount(virCgroupPtr group, const char *oldroot,
const char *mountopts)
{
- size_t i;
- VIR_AUTOFREE(char *) opts = NULL;
- VIR_AUTOFREE(char *) root = NULL;
-
- if (!(root = virCgroupIdentifyRoot(group)))
- return -1;
-
- VIR_DEBUG("Mounting cgroups at '%s'", root);
-
- if (virFileMakePath(root) < 0) {
- virReportSystemError(errno,
- _("Unable to create directory %s"),
- root);
- return -1;
- }
-
- if (virAsprintf(&opts,
- "mode=755,size=65536%s", mountopts) < 0)
- return -1;
-
- if (mount("tmpfs", root, "tmpfs", MS_NOSUID|MS_NODEV|MS_NOEXEC, opts) < 0) {
- virReportSystemError(errno,
- _("Failed to mount %s on %s type %s"),
- "tmpfs", root, "tmpfs");
- return -1;
- }
-
- for (i = 0; i < VIR_CGROUP_CONTROLLER_LAST; i++) {
- if (!group->controllers[i].mountPoint)
- continue;
-
- if (!virFileExists(group->controllers[i].mountPoint)) {
- VIR_AUTOFREE(char *) src = NULL;
- if (virAsprintf(&src, "%s%s",
- oldroot,
- group->controllers[i].mountPoint) < 0)
- return -1;
-
- VIR_DEBUG("Create mount point '%s'",
- group->controllers[i].mountPoint);
- if (virFileMakePath(group->controllers[i].mountPoint) < 0) {
- virReportSystemError(errno,
- _("Unable to create directory %s"),
- group->controllers[i].mountPoint);
- return -1;
- }
-
- if (mount(src, group->controllers[i].mountPoint, "none", MS_BIND,
- NULL) < 0) {
- virReportSystemError(errno,
- _("Failed to bind cgroup '%s' on '%s'"),
- src, group->controllers[i].mountPoint);
- return -1;
- }
- }
-
- if (group->controllers[i].linkPoint) {
- VIR_DEBUG("Link mount point '%s' to '%s'",
- group->controllers[i].mountPoint,
- group->controllers[i].linkPoint);
- if (symlink(group->controllers[i].mountPoint,
- group->controllers[i].linkPoint) < 0) {
- virReportSystemError(errno,
- _("Unable to symlink directory %s to %s"),
- group->controllers[i].mountPoint,
- group->controllers[i].linkPoint);
- return -1;
- }
- }
- }
-
- return 0;
+ return group->backend->bindMount(group, oldroot, mountopts);
}
diff --git a/src/util/vircgroupbackend.h b/src/util/vircgroupbackend.h
index 1964a48ff0..70deb47461 100644
--- a/src/util/vircgroupbackend.h
+++ b/src/util/vircgroupbackend.h
@@ -118,6 +118,11 @@ typedef int
(*virCgroupHasEmptyTasksCB)(virCgroupPtr cgroup,
int controller);
+typedef int
+(*virCgroupBindMountCB)(virCgroupPtr group,
+ const char *oldroot,
+ const char *mountopts);
+
struct _virCgroupBackend {
virCgroupBackendType type;
@@ -138,6 +143,7 @@ struct _virCgroupBackend {
virCgroupRemoveCB remove;
virCgroupAddTaskCB addTask;
virCgroupHasEmptyTasksCB hasEmptyTasks;
+ virCgroupBindMountCB bindMount;
};
typedef struct _virCgroupBackend virCgroupBackend;
typedef virCgroupBackend *virCgroupBackendPtr;
diff --git a/src/util/vircgroupv1.c b/src/util/vircgroupv1.c
index 57bcb6a685..0514ba392d 100644
--- a/src/util/vircgroupv1.c
+++ b/src/util/vircgroupv1.c
@@ -24,6 +24,9 @@
# include <mntent.h>
#endif
#include <sys/stat.h>
+#if defined HAVE_SYS_MOUNT_H
+# include <sys/mount.h>
+#endif
#include "internal.h"
@@ -754,6 +757,115 @@ virCgroupV1HasEmptyTasks(virCgroupPtr cgroup,
}
+static char *
+virCgroupV1IdentifyRoot(virCgroupPtr group)
+{
+ char *ret = NULL;
+ size_t i;
+
+ for (i = 0; i < VIR_CGROUP_CONTROLLER_LAST; i++) {
+ char *tmp;
+ if (!group->controllers[i].mountPoint)
+ continue;
+ if (!(tmp = strrchr(group->controllers[i].mountPoint, '/'))) {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ _("Could not find directory separator in %s"),
+ group->controllers[i].mountPoint);
+ return NULL;
+ }
+
+ if (VIR_STRNDUP(ret, group->controllers[i].mountPoint,
+ tmp - group->controllers[i].mountPoint) < 0)
+ return NULL;
+ return ret;
+ }
+
+ virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("Could not find any mounted v1 controllers"));
+ return NULL;
+}
+
+
+static int
+virCgroupV1BindMount(virCgroupPtr group,
+ const char *oldroot,
+ const char *mountopts)
+{
+ size_t i;
+ VIR_AUTOFREE(char *) opts = NULL;
+ VIR_AUTOFREE(char *) root = NULL;
+
+ if (!(root = virCgroupV1IdentifyRoot(group)))
+ return -1;
+
+ VIR_DEBUG("Mounting cgroups at '%s'", root);
+
+ if (virFileMakePath(root) < 0) {
+ virReportSystemError(errno,
+ _("Unable to create directory %s"),
+ root);
+ return -1;
+ }
+
+ if (virAsprintf(&opts,
+ "mode=755,size=65536%s", mountopts) < 0)
+ return -1;
+
+ if (mount("tmpfs", root, "tmpfs", MS_NOSUID|MS_NODEV|MS_NOEXEC, opts) < 0) {
+ virReportSystemError(errno,
+ _("Failed to mount %s on %s type %s"),
+ "tmpfs", root, "tmpfs");
+ return -1;
+ }
+
+ for (i = 0; i < VIR_CGROUP_CONTROLLER_LAST; i++) {
+ if (!group->controllers[i].mountPoint)
+ continue;
+
+ if (!virFileExists(group->controllers[i].mountPoint)) {
+ VIR_AUTOFREE(char *) src = NULL;
+ if (virAsprintf(&src, "%s%s",
+ oldroot,
+ group->controllers[i].mountPoint) < 0)
+ return -1;
+
+ VIR_DEBUG("Create mount point '%s'",
+ group->controllers[i].mountPoint);
+ if (virFileMakePath(group->controllers[i].mountPoint) < 0) {
+ virReportSystemError(errno,
+ _("Unable to create directory %s"),
+ group->controllers[i].mountPoint);
+ return -1;
+ }
+
+ if (mount(src, group->controllers[i].mountPoint, "none", MS_BIND,
+ NULL) < 0) {
+ virReportSystemError(errno,
+ _("Failed to bind cgroup '%s' on '%s'"),
+ src, group->controllers[i].mountPoint);
+ return -1;
+ }
+ }
+
+ if (group->controllers[i].linkPoint) {
+ VIR_DEBUG("Link mount point '%s' to '%s'",
+ group->controllers[i].mountPoint,
+ group->controllers[i].linkPoint);
+ if (symlink(group->controllers[i].mountPoint,
+ group->controllers[i].linkPoint) < 0) {
+ virReportSystemError(errno,
+ _("Unable to symlink directory %s to %s"),
+ group->controllers[i].mountPoint,
+ group->controllers[i].linkPoint);
+ return -1;
+ }
+ }
+ }
+
+ return 0;
+}
+
+
virCgroupBackend virCgroupV1Backend = {
.type = VIR_CGROUP_BACKEND_TYPE_V1,
@@ -773,6 +885,7 @@ virCgroupBackend virCgroupV1Backend = {
.remove = virCgroupV1Remove,
.addTask = virCgroupV1AddTask,
.hasEmptyTasks = virCgroupV1HasEmptyTasks,
+ .bindMount = virCgroupV1BindMount,
};
--
2.17.1
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