1 // SPDX-License-Identifier: GPL-2.0
3 #include <linux/sched.h>
4 #include <linux/slab.h>
8 static DEFINE_SPINLOCK(pin_lock);
10 void pin_remove(struct fs_pin *pin)
13 hlist_del_init(&pin->m_list);
14 hlist_del_init(&pin->s_list);
15 spin_unlock(&pin_lock);
16 spin_lock_irq(&pin->wait.lock);
18 wake_up_locked(&pin->wait);
19 spin_unlock_irq(&pin->wait.lock);
22 void pin_insert(struct fs_pin *pin, struct vfsmount *m)
25 hlist_add_head(&pin->s_list, &m->mnt_sb->s_pins);
26 hlist_add_head(&pin->m_list, &real_mount(m)->mnt_pins);
27 spin_unlock(&pin_lock);
30 void pin_kill(struct fs_pin *p)
32 wait_queue_entry_t wait;
39 spin_lock_irq(&p->wait.lock);
40 if (likely(!p->done)) {
42 spin_unlock_irq(&p->wait.lock);
48 spin_unlock_irq(&p->wait.lock);
52 __add_wait_queue(&p->wait, &wait);
54 set_current_state(TASK_UNINTERRUPTIBLE);
55 spin_unlock_irq(&p->wait.lock);
59 if (likely(list_empty(&wait.entry)))
61 /* OK, we know p couldn't have been freed yet */
62 spin_lock_irq(&p->wait.lock);
64 spin_unlock_irq(&p->wait.lock);
71 void mnt_pin_kill(struct mount *m)
76 p = READ_ONCE(m->mnt_pins.first);
81 pin_kill(hlist_entry(p, struct fs_pin, m_list));
85 void group_pin_kill(struct hlist_head *p)
90 q = READ_ONCE(p->first);
95 pin_kill(hlist_entry(q, struct fs_pin, s_list));