libcgroup: Add support for named hierarchies.

This feature has been available in the kernel for sometime, but was missed by
libcgroup.

Add support for named hierarchies. The controller is identified as
name=<name> and used in such fashion.

Signed-off-by: Dhaval Giani <dhaval.giani@gmail.com>

diff --git a/src/api.c b/src/api.c
index 2d4cd21e42a2051f3e9edaf289b92d546e9e2b98..53c94300b9ab5598afe5d9f703f50f6a257b7c61 100644 (file)
--- a/src/api.c
+++ b/src/api.c
@@ -759,6 +759,39 @@ int cgroup_init(void)
                                ent->mnt_opts, found_mnt);
                        found_mnt++;
                }
+
+               /*
+                * Doesn't match the controller.
+                * Check if it is a named hierarchy.
+                */
+               mntopt = hasmntopt(ent, "name");
+
+               if (mntopt) {
+                       mntopt = strtok_r(mntopt, ",", &strtok_buffer);
+                       /*
+                        * Check if it is a duplicate
+                        */
+                       duplicate = 0;
+                       for (j = 0; j < found_mnt; j++) {
+                               if (strncmp(mntopt, cg_mount_table[j].name,
+                                                       FILENAME_MAX) == 0) {
+                                       duplicate = 1;
+                                       break;
+                               }
+                       }
+
+                       if (duplicate) {
+                               cgroup_dbg("controller %s is already mounted on %s\n",
+                                       mntopt, cg_mount_table[j].path);
+                               continue;
+                       }
+
+                       strcpy(cg_mount_table[found_mnt].name, mntopt);
+                       strcpy(cg_mount_table[found_mnt].path, ent->mnt_dir);
+                       cgroup_dbg("Found cgroup option %s, count %d\n",
+                               ent->mnt_opts, found_mnt);
+                       found_mnt++;
+               }
        }
 
        free(temp_ent);