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Linux/fs/fs_pin.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 #include <linux/fs.h>
  3 #include <linux/sched.h>
  4 #include <linux/slab.h>
  5 #include "internal.h"
  6 #include "mount.h"
  7 
  8 static DEFINE_SPINLOCK(pin_lock);
  9 
 10 void pin_remove(struct fs_pin *pin)
 11 {
 12         spin_lock(&pin_lock);
 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);
 17         pin->done = 1;
 18         wake_up_locked(&pin->wait);
 19         spin_unlock_irq(&pin->wait.lock);
 20 }
 21 
 22 void pin_insert(struct fs_pin *pin, struct vfsmount *m)
 23 {
 24         spin_lock(&pin_lock);
 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);
 28 }
 29 
 30 void pin_kill(struct fs_pin *p)
 31 {
 32         wait_queue_entry_t wait;
 33 
 34         if (!p) {
 35                 rcu_read_unlock();
 36                 return;
 37         }
 38         init_wait(&wait);
 39         spin_lock_irq(&p->wait.lock);
 40         if (likely(!p->done)) {
 41                 p->done = -1;
 42                 spin_unlock_irq(&p->wait.lock);
 43                 rcu_read_unlock();
 44                 p->kill(p);
 45                 return;
 46         }
 47         if (p->done > 0) {
 48                 spin_unlock_irq(&p->wait.lock);
 49                 rcu_read_unlock();
 50                 return;
 51         }
 52         __add_wait_queue(&p->wait, &wait);
 53         while (1) {
 54                 set_current_state(TASK_UNINTERRUPTIBLE);
 55                 spin_unlock_irq(&p->wait.lock);
 56                 rcu_read_unlock();
 57                 schedule();
 58                 rcu_read_lock();
 59                 if (likely(list_empty(&wait.entry)))
 60                         break;
 61                 /* OK, we know p couldn't have been freed yet */
 62                 spin_lock_irq(&p->wait.lock);
 63                 if (p->done > 0) {
 64                         spin_unlock_irq(&p->wait.lock);
 65                         break;
 66                 }
 67         }
 68         rcu_read_unlock();
 69 }
 70 
 71 void mnt_pin_kill(struct mount *m)
 72 {
 73         while (1) {
 74                 struct hlist_node *p;
 75                 rcu_read_lock();
 76                 p = READ_ONCE(m->mnt_pins.first);
 77                 if (!p) {
 78                         rcu_read_unlock();
 79                         break;
 80                 }
 81                 pin_kill(hlist_entry(p, struct fs_pin, m_list));
 82         }
 83 }
 84 
 85 void group_pin_kill(struct hlist_head *p)
 86 {
 87         while (1) {
 88                 struct hlist_node *q;
 89                 rcu_read_lock();
 90                 q = READ_ONCE(p->first);
 91                 if (!q) {
 92                         rcu_read_unlock();
 93                         break;
 94                 }
 95                 pin_kill(hlist_entry(q, struct fs_pin, s_list));
 96         }
 97 }
 98 

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