vircgroup: introduce virCgroupGetInode function

For new feature Fibre Channel VMID we will need to get inode of the
VM root cgroup as it is used in the new kernel API together with VMID.

Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
Reviewed-by: Martin Kletzander <mkletzan@redhat.com>

diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 51a400ba59a4bece434d04be26cea4cceceaec26..fcb02c21b17923fe33ab83d938ecb9852c453636 100644 (file)
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -1922,6 +1922,7 @@ virCgroupGetCpuShares;
 virCgroupGetDevicePermsString;
 virCgroupGetDomainTotalCpuStats;
 virCgroupGetFreezerState;
+virCgroupGetInode;
 virCgroupGetMemoryHardLimit;
 virCgroupGetMemorySoftLimit;
 virCgroupGetMemoryStat;

diff --git a/src/util/vircgroup.c b/src/util/vircgroup.c
index 1b3b28342e9b452b0960f05146cce18b92f7b9e5..4c9445340e1ead10e541841eb46e2cde78693477 100644 (file)
--- a/src/util/vircgroup.c
+++ b/src/util/vircgroup.c
@@ -3973,3 +3973,34 @@ virCgroupGetCpuPeriodQuota(virCgroup *cgroup, unsigned long long *period,
 
     return 0;
 }
+
+
+/**
+ * virCgroupGetInode:
+ *
+ * @cgroup: the cgroup to get inode for
+ *
+ * Get the @cgroup inode and return its value to the caller.
+ *
+ * Returns inode on success, -1 on error with error message reported.
+ */
+int
+virCgroupGetInode(virCgroup *cgroup)
+{
+    struct stat st;
+    int controller = virCgroupGetAnyController(cgroup);
+    g_autofree char *path = NULL;
+
+    if (controller < 0)
+        return -1;
+
+    if (virCgroupPathOfController(cgroup, controller, "", &path) < 0)
+        return -1;
+
+    if (stat(path, &st) < 0) {
+        virReportSystemError(errno, _("failed to get stat for '%s'"), path);
+        return -1;
+    }
+
+    return st.st_ino;
+}

diff --git a/src/util/vircgroup.h b/src/util/vircgroup.h
index 8002cac570c9aed5a83c97e660d1290cd0956111..690f09465c80726bf8b2768c603e0ae1a9daeb5b 100644 (file)
--- a/src/util/vircgroup.h
+++ b/src/util/vircgroup.h
@@ -283,3 +283,5 @@ int virCgroupSetOwner(virCgroup *cgroup,
 int virCgroupHasEmptyTasks(virCgroup *cgroup, int controller);
 
 bool virCgroupControllerAvailable(int controller);
+
+int virCgroupGetInode(virCgroup *cgroup);