1 // SPDX-License-Identifier: GPL-2.0 1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/fs.h> 2 #include <linux/fs.h>
3 #include <linux/sched.h> 3 #include <linux/sched.h>
4 #include <linux/slab.h> 4 #include <linux/slab.h>
5 #include "internal.h" 5 #include "internal.h"
6 #include "mount.h" 6 #include "mount.h"
7 7
8 static DEFINE_SPINLOCK(pin_lock); 8 static DEFINE_SPINLOCK(pin_lock);
9 9
10 void pin_remove(struct fs_pin *pin) 10 void pin_remove(struct fs_pin *pin)
11 { 11 {
12 spin_lock(&pin_lock); 12 spin_lock(&pin_lock);
13 hlist_del_init(&pin->m_list); 13 hlist_del_init(&pin->m_list);
14 hlist_del_init(&pin->s_list); 14 hlist_del_init(&pin->s_list);
15 spin_unlock(&pin_lock); 15 spin_unlock(&pin_lock);
16 spin_lock_irq(&pin->wait.lock); 16 spin_lock_irq(&pin->wait.lock);
17 pin->done = 1; 17 pin->done = 1;
18 wake_up_locked(&pin->wait); 18 wake_up_locked(&pin->wait);
19 spin_unlock_irq(&pin->wait.lock); 19 spin_unlock_irq(&pin->wait.lock);
20 } 20 }
21 21
22 void pin_insert(struct fs_pin *pin, struct vfs 22 void pin_insert(struct fs_pin *pin, struct vfsmount *m)
23 { 23 {
24 spin_lock(&pin_lock); 24 spin_lock(&pin_lock);
25 hlist_add_head(&pin->s_list, &m->mnt_s 25 hlist_add_head(&pin->s_list, &m->mnt_sb->s_pins);
26 hlist_add_head(&pin->m_list, &real_mou 26 hlist_add_head(&pin->m_list, &real_mount(m)->mnt_pins);
27 spin_unlock(&pin_lock); 27 spin_unlock(&pin_lock);
28 } 28 }
29 29
30 void pin_kill(struct fs_pin *p) 30 void pin_kill(struct fs_pin *p)
31 { 31 {
32 wait_queue_entry_t wait; 32 wait_queue_entry_t wait;
33 33
34 if (!p) { 34 if (!p) {
35 rcu_read_unlock(); 35 rcu_read_unlock();
36 return; 36 return;
37 } 37 }
38 init_wait(&wait); 38 init_wait(&wait);
39 spin_lock_irq(&p->wait.lock); 39 spin_lock_irq(&p->wait.lock);
40 if (likely(!p->done)) { 40 if (likely(!p->done)) {
41 p->done = -1; 41 p->done = -1;
42 spin_unlock_irq(&p->wait.lock) 42 spin_unlock_irq(&p->wait.lock);
43 rcu_read_unlock(); 43 rcu_read_unlock();
44 p->kill(p); 44 p->kill(p);
45 return; 45 return;
46 } 46 }
47 if (p->done > 0) { 47 if (p->done > 0) {
48 spin_unlock_irq(&p->wait.lock) 48 spin_unlock_irq(&p->wait.lock);
49 rcu_read_unlock(); 49 rcu_read_unlock();
50 return; 50 return;
51 } 51 }
52 __add_wait_queue(&p->wait, &wait); 52 __add_wait_queue(&p->wait, &wait);
53 while (1) { 53 while (1) {
54 set_current_state(TASK_UNINTER 54 set_current_state(TASK_UNINTERRUPTIBLE);
55 spin_unlock_irq(&p->wait.lock) 55 spin_unlock_irq(&p->wait.lock);
56 rcu_read_unlock(); 56 rcu_read_unlock();
57 schedule(); 57 schedule();
58 rcu_read_lock(); 58 rcu_read_lock();
59 if (likely(list_empty(&wait.en 59 if (likely(list_empty(&wait.entry)))
60 break; 60 break;
61 /* OK, we know p couldn't have 61 /* OK, we know p couldn't have been freed yet */
62 spin_lock_irq(&p->wait.lock); 62 spin_lock_irq(&p->wait.lock);
63 if (p->done > 0) { 63 if (p->done > 0) {
64 spin_unlock_irq(&p->wa 64 spin_unlock_irq(&p->wait.lock);
65 break; 65 break;
66 } 66 }
67 } 67 }
68 rcu_read_unlock(); 68 rcu_read_unlock();
69 } 69 }
70 70
71 void mnt_pin_kill(struct mount *m) 71 void mnt_pin_kill(struct mount *m)
72 { 72 {
73 while (1) { 73 while (1) {
74 struct hlist_node *p; 74 struct hlist_node *p;
75 rcu_read_lock(); 75 rcu_read_lock();
76 p = READ_ONCE(m->mnt_pins.firs 76 p = READ_ONCE(m->mnt_pins.first);
77 if (!p) { 77 if (!p) {
78 rcu_read_unlock(); 78 rcu_read_unlock();
79 break; 79 break;
80 } 80 }
81 pin_kill(hlist_entry(p, struct 81 pin_kill(hlist_entry(p, struct fs_pin, m_list));
82 } 82 }
83 } 83 }
84 84
85 void group_pin_kill(struct hlist_head *p) 85 void group_pin_kill(struct hlist_head *p)
86 { 86 {
87 while (1) { 87 while (1) {
88 struct hlist_node *q; 88 struct hlist_node *q;
89 rcu_read_lock(); 89 rcu_read_lock();
90 q = READ_ONCE(p->first); 90 q = READ_ONCE(p->first);
91 if (!q) { 91 if (!q) {
92 rcu_read_unlock(); 92 rcu_read_unlock();
93 break; 93 break;
94 } 94 }
95 pin_kill(hlist_entry(q, struct 95 pin_kill(hlist_entry(q, struct fs_pin, s_list));
96 } 96 }
97 } 97 }
98 98
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