-#ifdef CONFIG_FAIR_USER_SCHED
-
-static void sched_destroy_user(struct user_struct *up)
-{
- sched_destroy_group(up->tg);
-}
-
-static int sched_create_user(struct user_struct *up)
-{
- int rc = 0;
-
- up->tg = sched_create_group();
- if (IS_ERR(up->tg))
- rc = -ENOMEM;
-
- return rc;
-}
-
-static void sched_switch_user(struct task_struct *p)
-{
- sched_move_task(p);
-}
-
-#else /* CONFIG_FAIR_USER_SCHED */
-
-static void sched_destroy_user(struct user_struct *up) { }
-static int sched_create_user(struct user_struct *up) { return 0; }
-static void sched_switch_user(struct task_struct *p) { }
-
-#endif /* CONFIG_FAIR_USER_SCHED */
-
-#if defined(CONFIG_FAIR_USER_SCHED) && defined(CONFIG_SYSFS)
-
-static struct kobject uids_kobject; /* represents /sys/kernel/uids directory */
-static DEFINE_MUTEX(uids_mutex);
-
-static inline void uids_mutex_lock(void)
-{
- mutex_lock(&uids_mutex);
-}
-
-static inline void uids_mutex_unlock(void)
-{
- mutex_unlock(&uids_mutex);
-}
-
-/* return cpu shares held by the user */
-static ssize_t cpu_shares_show(struct kset *kset, char *buffer)
-{
- struct user_struct *up = container_of(kset, struct user_struct, kset);
-
- return sprintf(buffer, "%lu\n", sched_group_shares(up->tg));
-}
-
-/* modify cpu shares held by the user */
-static ssize_t cpu_shares_store(struct kset *kset, const char *buffer,
- size_t size)
-{
- struct user_struct *up = container_of(kset, struct user_struct, kset);
- unsigned long shares;
- int rc;
-
- sscanf(buffer, "%lu", &shares);
-
- rc = sched_group_set_shares(up->tg, shares);
-
- return (rc ? rc : size);
-}
-
-static void user_attr_init(struct subsys_attribute *sa, char *name, int mode)
-{
- sa->attr.name = name;
- sa->attr.mode = mode;
- sa->show = cpu_shares_show;
- sa->store = cpu_shares_store;
-}
-
-/* Create "/sys/kernel/uids/<uid>" directory and
- * "/sys/kernel/uids/<uid>/cpu_share" file for this user.
- */
-static int user_kobject_create(struct user_struct *up)
-{
- struct kset *kset = &up->kset;
- struct kobject *kobj = &kset->kobj;
- int error;
-
- memset(kset, 0, sizeof(struct kset));
- kobj->parent = &uids_kobject; /* create under /sys/kernel/uids dir */
- kobject_set_name(kobj, "%d", up->uid);
- kset_init(kset);
- user_attr_init(&up->user_attr, "cpu_share", 0644);
-
- error = kobject_add(kobj);
- if (error)
- goto done;
-
- error = sysfs_create_file(kobj, &up->user_attr.attr);
- if (error)
- kobject_del(kobj);
-
- kobject_uevent(kobj, KOBJ_ADD);
-
-done:
- return error;
-}
-
-/* create these in sysfs filesystem:
- * "/sys/kernel/uids" directory
- * "/sys/kernel/uids/0" directory (for root user)
- * "/sys/kernel/uids/0/cpu_share" file (for root user)
- */
-int __init uids_kobject_init(void)
-{
- int error;
-
- /* create under /sys/kernel dir */
- uids_kobject.parent = &kernel_kset->kobj;
- uids_kobject.kset = kernel_kset;
- kobject_set_name(&uids_kobject, "uids");
- kobject_init(&uids_kobject);
-
- error = kobject_add(&uids_kobject);
- if (!error)
- error = user_kobject_create(&root_user);
-
- return error;
-}
-
-/* work function to remove sysfs directory for a user and free up
- * corresponding structures.
- */
-static void remove_user_sysfs_dir(struct work_struct *w)
-{
- struct user_struct *up = container_of(w, struct user_struct, work);
- struct kobject *kobj = &up->kset.kobj;
- unsigned long flags;
- int remove_user = 0;
-
- /* Make uid_hash_remove() + sysfs_remove_file() + kobject_del()
- * atomic.
- */
- uids_mutex_lock();
-
- local_irq_save(flags);
-
- if (atomic_dec_and_lock(&up->__count, &uidhash_lock)) {
- uid_hash_remove(up);
- remove_user = 1;
- spin_unlock_irqrestore(&uidhash_lock, flags);
- } else {
- local_irq_restore(flags);
- }
-
- if (!remove_user)
- goto done;
-
- sysfs_remove_file(kobj, &up->user_attr.attr);
- kobject_uevent(kobj, KOBJ_REMOVE);
- kobject_del(kobj);
-
- sched_destroy_user(up);
- key_put(up->uid_keyring);
- key_put(up->session_keyring);
- kmem_cache_free(uid_cachep, up);
-
-done:
- uids_mutex_unlock();
-}
-
-/* IRQs are disabled and uidhash_lock is held upon function entry.
- * IRQ state (as stored in flags) is restored and uidhash_lock released
- * upon function exit.
- */
-static inline void free_user(struct user_struct *up, unsigned long flags)
-{
- /* restore back the count */
- atomic_inc(&up->__count);
- spin_unlock_irqrestore(&uidhash_lock, flags);
-
- INIT_WORK(&up->work, remove_user_sysfs_dir);
- schedule_work(&up->work);
-}
-
-#else /* CONFIG_FAIR_USER_SCHED && CONFIG_SYSFS */
-
-static inline int user_kobject_create(struct user_struct *up) { return 0; }
-static inline void uids_mutex_lock(void) { }
-static inline void uids_mutex_unlock(void) { }
-