diff options
| -rw-r--r-- | include/linux/cgroup.h | 26 | ||||
| -rw-r--r-- | kernel/cgroup.c | 41 |
2 files changed, 22 insertions, 45 deletions
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h index 305e94ee17f5..b42251a23129 100644 --- a/include/linux/cgroup.h +++ b/include/linux/cgroup.h @@ -412,12 +412,11 @@ struct cftype { unsigned int flags; /* - * The subsys this file belongs to. Initialized automatically - * during registration. NULL for cgroup core files. + * Fields used for internal bookkeeping. Initialized automatically + * during registration. */ - struct cgroup_subsys *ss; - - /* kernfs_ops to use, initialized automatically during registration */ + struct cgroup_subsys *ss; /* NULL for cgroup core files */ + struct list_head node; /* anchored at ss->cfts */ struct kernfs_ops *kf_ops; /* @@ -472,16 +471,6 @@ struct cftype { }; /* - * cftype_sets describe cftypes belonging to a subsystem and are chained at - * cgroup_subsys->cftsets. Each cftset points to an array of cftypes - * terminated by zero length name. - */ -struct cftype_set { - struct list_head node; /* chained at subsys->cftsets */ - struct cftype *cfts; -}; - -/* * See the comment above CGRP_ROOT_SANE_BEHAVIOR for details. This * function can be called as long as @cgrp is accessible. */ @@ -597,8 +586,11 @@ struct cgroup_subsys { /* link to parent, protected by cgroup_lock() */ struct cgroupfs_root *root; - /* list of cftype_sets */ - struct list_head cftsets; + /* + * List of cftypes. Each entry is the first entry of an array + * terminated by zero length name. + */ + struct list_head cfts; /* base cftypes, automatically registered with subsys itself */ struct cftype *base_cftypes; diff --git a/kernel/cgroup.c b/kernel/cgroup.c index a2cbd1549995..506ebd61d1c2 100644 --- a/kernel/cgroup.c +++ b/kernel/cgroup.c @@ -1016,12 +1016,12 @@ static void cgroup_clear_dir(struct cgroup *cgrp, unsigned long subsys_mask) int i; for_each_subsys(ss, i) { - struct cftype_set *set; + struct cftype *cfts; if (!test_bit(i, &subsys_mask)) continue; - list_for_each_entry(set, &ss->cftsets, node) - cgroup_addrm_files(cgrp, set->cfts, false); + list_for_each_entry(cfts, &ss->cfts, node) + cgroup_addrm_files(cgrp, cfts, false); } } @@ -2392,6 +2392,8 @@ static int cgroup_init_cftypes(struct cgroup_subsys *ss, struct cftype *cfts) for (cft = cfts; cft->name[0] != '\0'; cft++) { struct kernfs_ops *kf_ops; + WARN_ON(cft->ss || cft->kf_ops); + if (cft->seq_start) kf_ops = &cgroup_kf_ops; else @@ -2430,26 +2432,15 @@ static int cgroup_init_cftypes(struct cgroup_subsys *ss, struct cftype *cfts) */ int cgroup_rm_cftypes(struct cftype *cfts) { - struct cftype *found = NULL; - struct cftype_set *set; - if (!cfts || !cfts[0].ss) return -ENOENT; cgroup_cfts_prepare(); + list_del(&cfts->node); + cgroup_cfts_commit(cfts, false); - list_for_each_entry(set, &cfts[0].ss->cftsets, node) { - if (set->cfts == cfts) { - list_del(&set->node); - kfree(set); - found = cfts; - break; - } - } - - cgroup_cfts_commit(found, false); cgroup_exit_cftypes(cfts); - return found ? 0 : -ENOENT; + return 0; } /** @@ -2468,20 +2459,14 @@ int cgroup_rm_cftypes(struct cftype *cfts) */ int cgroup_add_cftypes(struct cgroup_subsys *ss, struct cftype *cfts) { - struct cftype_set *set; int ret; - set = kzalloc(sizeof(*set), GFP_KERNEL); - if (!set) - return -ENOMEM; - ret = cgroup_init_cftypes(ss, cfts); if (ret) return ret; cgroup_cfts_prepare(); - set->cfts = cfts; - list_add_tail(&set->node, &ss->cftsets); + list_add_tail(&cfts->node, &ss->cfts); ret = cgroup_cfts_commit(cfts, true); if (ret) cgroup_rm_cftypes(cfts); @@ -3574,13 +3559,13 @@ static int cgroup_populate_dir(struct cgroup *cgrp, unsigned long subsys_mask) /* process cftsets of each subsystem */ for_each_subsys(ss, i) { - struct cftype_set *set; + struct cftype *cfts; if (!test_bit(i, &subsys_mask)) continue; - list_for_each_entry(set, &ss->cftsets, node) { - ret = cgroup_addrm_files(cgrp, set->cfts, true); + list_for_each_entry(cfts, &ss->cfts, node) { + ret = cgroup_addrm_files(cgrp, cfts, true); if (ret < 0) goto err; } @@ -4169,7 +4154,7 @@ static void __init cgroup_init_subsys(struct cgroup_subsys *ss) mutex_lock(&cgroup_tree_mutex); mutex_lock(&cgroup_mutex); - INIT_LIST_HEAD(&ss->cftsets); + INIT_LIST_HEAD(&ss->cfts); /* Create the top cgroup state for this subsystem */ ss->root = &cgroup_dummy_root; |