+spinlock_t sysfs_lock = SPIN_LOCK_UNLOCKED;
+spinlock_t kobj_sysfs_assoc_lock = SPIN_LOCK_UNLOCKED;
+
+static spinlock_t sysfs_ino_lock = SPIN_LOCK_UNLOCKED;
+static DEFINE_IDA(sysfs_ino_ida);
+
+int sysfs_alloc_ino(ino_t *pino)
+{
+ int ino, rc;
+
+ retry:
+ spin_lock(&sysfs_ino_lock);
+ rc = ida_get_new_above(&sysfs_ino_ida, 2, &ino);
+ spin_unlock(&sysfs_ino_lock);
+
+ if (rc == -EAGAIN) {
+ if (ida_pre_get(&sysfs_ino_ida, GFP_KERNEL))
+ goto retry;
+ rc = -ENOMEM;
+ }
+
+ *pino = ino;
+ return rc;
+}
+
+static void sysfs_free_ino(ino_t ino)
+{
+ spin_lock(&sysfs_ino_lock);
+ ida_remove(&sysfs_ino_ida, ino);
+ spin_unlock(&sysfs_ino_lock);
+}
+
+void release_sysfs_dirent(struct sysfs_dirent * sd)
+{
+ struct sysfs_dirent *parent_sd;
+
+ repeat:
+ parent_sd = sd->s_parent;
+
+ if (sd->s_type & SYSFS_KOBJ_LINK)
+ kobject_put(sd->s_elem.symlink.target_kobj);
+ if (sd->s_type & SYSFS_COPY_NAME)
+ kfree(sd->s_name);
+ kfree(sd->s_iattr);
+ sysfs_free_ino(sd->s_ino);
+ kmem_cache_free(sysfs_dir_cachep, sd);
+
+ sd = parent_sd;
+ if (sd && atomic_dec_and_test(&sd->s_count))
+ goto repeat;
+}