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#include <linux/fs.h> struct fs_pin { atomic_long_t count; union { struct { struct hlist_node s_list; struct hlist_node m_list; }; struct rcu_head rcu; }; void (*kill)(struct fs_pin *); }; void pin_put(struct fs_pin *); void pin_remove(struct fs_pin *); void pin_insert(struct fs_pin *, struct vfsmount *);