.processes = ATOMIC_INIT(1),
.files = ATOMIC_INIT(0),
.sigpending = ATOMIC_INIT(0),
- .mq_bytes = 0,
.locked_shm = 0,
#ifdef CONFIG_KEYS
.uid_keyring = &root_user_keyring,
/*
* These routines must be called with the uidhash spinlock held!
*/
-static inline void uid_hash_insert(struct user_struct *up,
- struct hlist_head *hashent)
+static void uid_hash_insert(struct user_struct *up, struct hlist_head *hashent)
{
hlist_add_head(&up->uidhash_node, hashent);
}
-static inline void uid_hash_remove(struct user_struct *up)
+static void uid_hash_remove(struct user_struct *up)
{
hlist_del_init(&up->uidhash_node);
}
-static inline struct user_struct *uid_hash_find(uid_t uid,
- struct hlist_head *hashent)
+static struct user_struct *uid_hash_find(uid_t uid, struct hlist_head *hashent)
{
struct user_struct *user;
struct hlist_node *h;
#ifdef CONFIG_FAIR_USER_SCHED
-static struct kobject uids_kobject; /* represents /sys/kernel/uids directory */
-static DEFINE_MUTEX(uids_mutex);
-
static void sched_destroy_user(struct user_struct *up)
{
sched_destroy_group(up->tg);
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 kset *uids_kset; /* represents the /sys/kernel/uids/ directory */
+static DEFINE_MUTEX(uids_mutex);
+
static inline void uids_mutex_lock(void)
{
mutex_lock(&uids_mutex);
mutex_unlock(&uids_mutex);
}
-/* return cpu shares held by the user */
-ssize_t cpu_shares_show(struct kset *kset, char *buffer)
+/* uid directory attributes */
+static ssize_t cpu_shares_show(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ char *buf)
{
- struct user_struct *up = container_of(kset, struct user_struct, kset);
+ struct user_struct *up = container_of(kobj, struct user_struct, kobj);
- return sprintf(buffer, "%lu\n", sched_group_shares(up->tg));
+ return sprintf(buf, "%lu\n", sched_group_shares(up->tg));
}
-/* modify cpu shares held by the user */
-ssize_t cpu_shares_store(struct kset *kset, const char *buffer, size_t size)
+static ssize_t cpu_shares_store(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ const char *buf, size_t size)
{
- struct user_struct *up = container_of(kset, struct user_struct, kset);
+ struct user_struct *up = container_of(kobj, struct user_struct, kobj);
unsigned long shares;
int rc;
- sscanf(buffer, "%lu", &shares);
+ sscanf(buf, "%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)
+static struct kobj_attribute cpu_share_attr =
+ __ATTR(cpu_share, 0644, cpu_shares_show, cpu_shares_store);
+
+/* default attributes per uid directory */
+static struct attribute *uids_attributes[] = {
+ &cpu_share_attr.attr,
+ NULL
+};
+
+/* the lifetime of user_struct is not managed by the core (now) */
+static void uids_release(struct kobject *kobj)
{
- sa->attr.name = name;
- sa->attr.mode = mode;
- sa->show = cpu_shares_show;
- sa->store = cpu_shares_store;
+ return;
}
-/* 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)
+static struct kobj_type uids_ktype = {
+ .sysfs_ops = &kobj_sysfs_ops,
+ .default_attrs = uids_attributes,
+ .release = uids_release,
+};
+
+/* create /sys/kernel/uids/<uid>/cpu_share file for this user */
+static int uids_user_create(struct user_struct *up)
{
- struct kset *kset = &up->kset;
- struct kobject *kobj = &kset->kobj;
+ struct kobject *kobj = &up->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);
-
+ memset(kobj, 0, sizeof(struct kobject));
+ kobj->ktype = &uids_ktype;
+ kobj->kset = uids_kset;
+ kobject_init(kobj);
+ kobject_set_name(&up->kobj, "%d", up->uid);
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:
+/* create these entries in sysfs:
* "/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 __init uids_sysfs_init(void)
{
- int error;
-
- /* create under /sys/kernel dir */
- uids_kobject.parent = &kernel_subsys.kobj;
- uids_kobject.kset = &kernel_subsys;
- kobject_set_name(&uids_kobject, "uids");
- kobject_init(&uids_kobject);
+ uids_kset = kset_create_and_add("uids", NULL, &kernel_kset->kobj);
+ if (!uids_kset)
+ return -ENOMEM;
- error = kobject_add(&uids_kobject);
- if (!error)
- error = user_kobject_create(&root_user);
-
- return error;
+ return uids_user_create(&root_user);
}
/* work function to remove sysfs directory for a user and free up
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;
if (!remove_user)
goto done;
- sysfs_remove_file(kobj, &up->user_attr.attr);
- kobject_uevent(kobj, KOBJ_REMOVE);
- kobject_del(kobj);
+ kobject_uevent(&up->kobj, KOBJ_REMOVE);
+ kobject_del(&up->kobj);
+ kobject_put(&up->kobj);
sched_destroy_user(up);
key_put(up->uid_keyring);
schedule_work(&up->work);
}
-#else /* CONFIG_FAIR_USER_SCHED */
+#else /* CONFIG_FAIR_USER_SCHED && CONFIG_SYSFS */
-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) { }
-static inline int user_kobject_create(struct user_struct *up) { return 0; }
+int uids_sysfs_init(void) { return 0; }
+static inline int uids_user_create(struct user_struct *up) { return 0; }
static inline void uids_mutex_lock(void) { }
static inline void uids_mutex_unlock(void) { }
kmem_cache_free(uid_cachep, up);
}
-#endif /* CONFIG_FAIR_USER_SCHED */
+#endif
/*
* Locate the user_struct for the passed UID. If found, take a ref on it. The
struct hlist_head *hashent = uidhashentry(ns, uid);
struct user_struct *up;
- /* Make uid_hash_find() + user_kobject_create() + uid_hash_insert()
+ /* Make uid_hash_find() + uids_user_create() + uid_hash_insert()
* atomic.
*/
uids_mutex_lock();
struct user_struct *new;
new = kmem_cache_alloc(uid_cachep, GFP_KERNEL);
- if (!new)
+ if (!new) {
+ uids_mutex_unlock();
return NULL;
+ }
+
new->uid = uid;
atomic_set(&new->__count, 1);
atomic_set(&new->processes, 0);
atomic_set(&new->inotify_watches, 0);
atomic_set(&new->inotify_devs, 0);
#endif
-
+#ifdef CONFIG_POSIX_MQUEUE
new->mq_bytes = 0;
+#endif
new->locked_shm = 0;
if (alloc_uid_keyring(new, current) < 0) {
kmem_cache_free(uid_cachep, new);
+ uids_mutex_unlock();
return NULL;
}
key_put(new->uid_keyring);
key_put(new->session_keyring);
kmem_cache_free(uid_cachep, new);
+ uids_mutex_unlock();
return NULL;
}
- if (user_kobject_create(new)) {
+ if (uids_user_create(new)) {
sched_destroy_user(new);
key_put(new->uid_keyring);
key_put(new->session_keyring);