#include <linux/module.h>
#include <linux/user_namespace.h>
+struct user_namespace init_user_ns = {
+ .kref = {
+ .refcount = ATOMIC_INIT(2),
+ },
+ .root_user = &root_user,
+};
+EXPORT_SYMBOL_GPL(init_user_ns);
+
/*
* UID task count cache, to get fast user lookup in "alloc_uid"
* when changing user ID's (ie setuid() and friends).
#if defined(CONFIG_FAIR_USER_SCHED) && defined(CONFIG_SYSFS)
-static struct kobject uids_kobject; /* represents /sys/kernel/uids directory */
+static struct kset *uids_kset; /* represents the /sys/kernel/uids/ directory */
static DEFINE_MUTEX(uids_mutex);
static inline void uids_mutex_lock(void)
mutex_unlock(&uids_mutex);
}
-/* return cpu shares held by the user */
-static 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 */
-static 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);
+
+static ssize_t cpu_rt_runtime_show(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ char *buf)
{
- sa->attr.name = name;
- sa->attr.mode = mode;
- sa->show = cpu_shares_show;
- sa->store = cpu_shares_store;
+ struct user_struct *up = container_of(kobj, struct user_struct, kobj);
+
+ return sprintf(buf, "%lu\n", sched_group_rt_runtime(up->tg));
}
-/* 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 ssize_t cpu_rt_runtime_store(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ const char *buf, size_t size)
{
- struct kset *kset = &up->kset;
- struct kobject *kobj = &kset->kobj;
- int error;
+ struct user_struct *up = container_of(kobj, struct user_struct, kobj);
+ unsigned long rt_runtime;
+ int rc;
- 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);
+ sscanf(buf, "%lu", &rt_runtime);
- error = kobject_add(kobj);
- if (error)
- goto done;
+ rc = sched_group_set_rt_runtime(up->tg, rt_runtime);
- error = sysfs_create_file(kobj, &up->user_attr.attr);
- if (error)
- kobject_del(kobj);
+ return (rc ? rc : size);
+}
- kobject_uevent(kobj, KOBJ_ADD);
+static struct kobj_attribute cpu_rt_runtime_attr =
+ __ATTR(cpu_rt_runtime, 0644, cpu_rt_runtime_show, cpu_rt_runtime_store);
+/* default attributes per uid directory */
+static struct attribute *uids_attributes[] = {
+ &cpu_share_attr.attr,
+ &cpu_rt_runtime_attr.attr,
+ NULL
+};
+
+/* the lifetime of user_struct is not managed by the core (now) */
+static void uids_release(struct kobject *kobj)
+{
+ return;
+}
+
+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 kobject *kobj = &up->kobj;
+ int error;
+
+ memset(kobj, 0, sizeof(struct kobject));
+ kobj->kset = uids_kset;
+ error = kobject_init_and_add(kobj, &uids_ktype, NULL, "%d", up->uid);
+ if (error) {
+ kobject_put(kobj);
+ goto done;
+ }
+
+ 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;
+ uids_kset = kset_create_and_add("uids", NULL, kernel_kobj);
+ if (!uids_kset)
+ return -ENOMEM;
- /* 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);
-
- 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);
#else /* CONFIG_FAIR_USER_SCHED && CONFIG_SYSFS */
-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) { }
struct user_struct * alloc_uid(struct user_namespace *ns, uid_t uid)
{
struct hlist_head *hashent = uidhashentry(ns, uid);
- struct user_struct *up;
+ struct user_struct *up, *new;
- /* Make uid_hash_find() + user_kobject_create() + uid_hash_insert()
+ /* Make uid_hash_find() + uids_user_create() + uid_hash_insert()
* atomic.
*/
uids_mutex_lock();
spin_unlock_irq(&uidhash_lock);
if (!up) {
- struct user_struct *new;
-
new = kmem_cache_alloc(uid_cachep, GFP_KERNEL);
- if (!new) {
- uids_mutex_unlock();
- return NULL;
- }
+ if (!new)
+ goto out_unlock;
new->uid = uid;
atomic_set(&new->__count, 1);
#endif
new->locked_shm = 0;
- if (alloc_uid_keyring(new, current) < 0) {
- kmem_cache_free(uid_cachep, new);
- uids_mutex_unlock();
- return NULL;
- }
+ if (alloc_uid_keyring(new, current) < 0)
+ goto out_free_user;
- if (sched_create_user(new) < 0) {
- key_put(new->uid_keyring);
- key_put(new->session_keyring);
- kmem_cache_free(uid_cachep, new);
- uids_mutex_unlock();
- return NULL;
- }
+ if (sched_create_user(new) < 0)
+ goto out_put_keys;
- if (user_kobject_create(new)) {
- sched_destroy_user(new);
- key_put(new->uid_keyring);
- key_put(new->session_keyring);
- kmem_cache_free(uid_cachep, new);
- uids_mutex_unlock();
- return NULL;
- }
+ if (uids_user_create(new))
+ goto out_destoy_sched;
/*
* Before adding this, check whether we raced
uids_mutex_unlock();
return up;
+
+out_destoy_sched:
+ sched_destroy_user(new);
+out_put_keys:
+ key_put(new->uid_keyring);
+ key_put(new->session_keyring);
+out_free_user:
+ kmem_cache_free(uid_cachep, new);
+out_unlock:
+ uids_mutex_unlock();
+ return NULL;
}
void switch_uid(struct user_struct *new_user)
suid_keys(current);
}
+#ifdef CONFIG_USER_NS
void release_uids(struct user_namespace *ns)
{
int i;
free_uid(ns->root_user);
}
+#endif
static int __init uid_cache_init(void)
{
git.samba.org / sfrench / cifs-2.6.git / blobdiff