Re: [libvirt] [PATCH 1 of 2] Add internal cgroup manipulation functions

This patch adds src/cgroup.{c,h} with support for creating and manipulating cgroups. All groups created with the internal API are forced under $mount/libvirt/ to keep everything together. The first time a group is created, the libvirt directory is also created, and the settings from the root are inherited. The code creates groups in all mounts requires to get memory and devices functionality. When setting a value, the appropriate mount is determined and the value is set there. I have tested this with all controllers mounted in a single location, as well as all of them mounted separately.

+int virCgroupForDomain(virDomainDefPtr def, virCgroupPtr *group)

+{ + int rc; + virCgroupPtr typegrp = NULL; + const char *typestr = virDomainVirtTypeToString(def->virtType);

+ + if (typestr == NULL) + return -EINVAL; + + rc = virCgroupOpen(NULL, typestr, &typegrp); + if (rc == -ENOENT) { + rc = virCgroupCreate(NULL, typestr, &typegrp); + if (rc != 0) + goto out; + } else if (rc != 0) + goto out; + + rc = virCgroupOpen(typegrp, def->name, group); + if (rc == -ENOENT) + rc = virCgroupCreate(typegrp, def->name, group); +out: + virCgroupFree(&typegrp); + + return rc; +} +