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io_uring: fix sporadic -EFAULT from IORING_OP_RECVMSG
[linux.git] / fs / io-wq.h
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1#ifndef INTERNAL_IO_WQ_H
2#define INTERNAL_IO_WQ_H
3
4struct io_wq;
5
6enum {
7 IO_WQ_WORK_CANCEL = 1,
8 IO_WQ_WORK_HAS_MM = 2,
9 IO_WQ_WORK_HASHED = 4,
10 IO_WQ_WORK_NEEDS_USER = 8,
fcb323cc 11 IO_WQ_WORK_NEEDS_FILES = 16,
c5def4ab 12 IO_WQ_WORK_UNBOUND = 32,
7d723065 13 IO_WQ_WORK_INTERNAL = 64,
b76da70f 14 IO_WQ_WORK_CB = 128,
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15
16 IO_WQ_HASH_SHIFT = 24, /* upper 8 bits are used for hash key */
17};
18
19enum io_wq_cancel {
20 IO_WQ_CANCEL_OK, /* cancelled before started */
21 IO_WQ_CANCEL_RUNNING, /* found, running, and attempted cancelled */
22 IO_WQ_CANCEL_NOTFOUND, /* work not found */
23};
24
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25struct io_wq_work_node {
26 struct io_wq_work_node *next;
27};
28
29struct io_wq_work_list {
30 struct io_wq_work_node *first;
31 struct io_wq_work_node *last;
32};
33
34static inline void wq_list_add_tail(struct io_wq_work_node *node,
35 struct io_wq_work_list *list)
36{
37 if (!list->first) {
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38 list->last = node;
39 WRITE_ONCE(list->first, node);
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40 } else {
41 list->last->next = node;
42 list->last = node;
43 }
44}
45
46static inline void wq_node_del(struct io_wq_work_list *list,
47 struct io_wq_work_node *node,
48 struct io_wq_work_node *prev)
49{
50 if (node == list->first)
e995d512 51 WRITE_ONCE(list->first, node->next);
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52 if (node == list->last)
53 list->last = prev;
54 if (prev)
55 prev->next = node->next;
08bdcc35 56 node->next = NULL;
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57}
58
59#define wq_list_for_each(pos, prv, head) \
60 for (pos = (head)->first, prv = NULL; pos; prv = pos, pos = (pos)->next)
61
e995d512 62#define wq_list_empty(list) (READ_ONCE((list)->first) == NULL)
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63#define INIT_WQ_LIST(list) do { \
64 (list)->first = NULL; \
65 (list)->last = NULL; \
66} while (0)
67
771b53d0 68struct io_wq_work {
b76da70f 69 union {
6206f0e1 70 struct io_wq_work_node list;
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71 void *data;
72 };
771b53d0 73 void (*func)(struct io_wq_work **);
fcb323cc 74 struct files_struct *files;
6206f0e1 75 unsigned flags;
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76};
77
78#define INIT_IO_WORK(work, _func) \
79 do { \
6206f0e1 80 (work)->list.next = NULL; \
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81 (work)->func = _func; \
82 (work)->flags = 0; \
fcb323cc 83 (work)->files = NULL; \
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84 } while (0) \
85
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86typedef void (get_work_fn)(struct io_wq_work *);
87typedef void (put_work_fn)(struct io_wq_work *);
88
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89struct io_wq_data {
90 struct mm_struct *mm;
91 struct user_struct *user;
0b8c0ec7 92 const struct cred *creds;
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93
94 get_work_fn *get_work;
95 put_work_fn *put_work;
96};
97
98struct io_wq *io_wq_create(unsigned bounded, struct io_wq_data *data);
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99void io_wq_destroy(struct io_wq *wq);
100
101void io_wq_enqueue(struct io_wq *wq, struct io_wq_work *work);
102void io_wq_enqueue_hashed(struct io_wq *wq, struct io_wq_work *work, void *val);
103void io_wq_flush(struct io_wq *wq);
104
105void io_wq_cancel_all(struct io_wq *wq);
106enum io_wq_cancel io_wq_cancel_work(struct io_wq *wq, struct io_wq_work *cwork);
107
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108typedef bool (work_cancel_fn)(struct io_wq_work *, void *);
109
110enum io_wq_cancel io_wq_cancel_cb(struct io_wq *wq, work_cancel_fn *cancel,
111 void *data);
112
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113#if defined(CONFIG_IO_WQ)
114extern void io_wq_worker_sleeping(struct task_struct *);
115extern void io_wq_worker_running(struct task_struct *);
116#else
117static inline void io_wq_worker_sleeping(struct task_struct *tsk)
118{
119}
120static inline void io_wq_worker_running(struct task_struct *tsk)
121{
122}
8cdda87a 123#endif /* CONFIG_IO_WQ */
771b53d0 124
8cdda87a 125#endif /* INTERNAL_IO_WQ_H */
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