+/**
+ * evict_inodes - evict all evictable inodes for a superblock
+ * @sb: superblock to operate on
+ *
+ * Make sure that no inodes with zero refcount are retained. This is
+ * called by superblock shutdown after having MS_ACTIVE flag removed,
+ * so any inode reaching zero refcount during or after that call will
+ * be immediately evicted.
+ */
+void evict_inodes(struct super_block *sb)
+{
+ struct inode *inode, *next;
+ LIST_HEAD(dispose);
+
+ down_write(&iprune_sem);
+
+ spin_lock(&inode_lock);
+ list_for_each_entry_safe(inode, next, &sb->s_inodes, i_sb_list) {
+ if (atomic_read(&inode->i_count))
+ continue;
+
+ if (inode->i_state & (I_NEW | I_FREEING | I_WILL_FREE)) {
+ WARN_ON(1);
+ continue;
+ }
+
+ inode->i_state |= I_FREEING;
+
+ /*
+ * Move the inode off the IO lists and LRU once I_FREEING is
+ * set so that it won't get moved back on there if it is dirty.
+ */
+ list_move(&inode->i_lru, &dispose);
+ list_del_init(&inode->i_wb_list);
+ if (!(inode->i_state & (I_DIRTY | I_SYNC)))
+ percpu_counter_dec(&nr_inodes_unused);
+ }
+ spin_unlock(&inode_lock);
+
+ dispose_list(&dispose);
+ up_write(&iprune_sem);
+}
+