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io_uring: limit {io|sq}poll submit locking scope
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1#ifndef INTERNAL_IO_WQ_H
2#define INTERNAL_IO_WQ_H
3
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4#include <linux/io_uring.h>
5
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6struct io_wq;
7
8enum {
9 IO_WQ_WORK_CANCEL = 1,
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10 IO_WQ_WORK_HASHED = 2,
11 IO_WQ_WORK_UNBOUND = 4,
12 IO_WQ_WORK_NO_CANCEL = 8,
13 IO_WQ_WORK_CONCURRENT = 16,
771b53d0 14
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15 IO_WQ_WORK_FILES = 32,
16 IO_WQ_WORK_FS = 64,
17 IO_WQ_WORK_MM = 128,
18 IO_WQ_WORK_CREDS = 256,
19 IO_WQ_WORK_BLKCG = 512,
69228338 20 IO_WQ_WORK_FSIZE = 1024,
0f203765 21
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22 IO_WQ_HASH_SHIFT = 24, /* upper 8 bits are used for hash key */
23};
24
25enum io_wq_cancel {
26 IO_WQ_CANCEL_OK, /* cancelled before started */
27 IO_WQ_CANCEL_RUNNING, /* found, running, and attempted cancelled */
28 IO_WQ_CANCEL_NOTFOUND, /* work not found */
29};
30
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31struct io_wq_work_node {
32 struct io_wq_work_node *next;
33};
34
35struct io_wq_work_list {
36 struct io_wq_work_node *first;
37 struct io_wq_work_node *last;
38};
39
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40static inline void wq_list_add_after(struct io_wq_work_node *node,
41 struct io_wq_work_node *pos,
42 struct io_wq_work_list *list)
43{
44 struct io_wq_work_node *next = pos->next;
45
46 pos->next = node;
47 node->next = next;
48 if (!next)
49 list->last = node;
50}
51
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52static inline void wq_list_add_tail(struct io_wq_work_node *node,
53 struct io_wq_work_list *list)
54{
55 if (!list->first) {
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56 list->last = node;
57 WRITE_ONCE(list->first, node);
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58 } else {
59 list->last->next = node;
60 list->last = node;
61 }
62}
63
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64static inline void wq_list_cut(struct io_wq_work_list *list,
65 struct io_wq_work_node *last,
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66 struct io_wq_work_node *prev)
67{
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68 /* first in the list, if prev==NULL */
69 if (!prev)
70 WRITE_ONCE(list->first, last->next);
71 else
72 prev->next = last->next;
73
74 if (last == list->last)
6206f0e1 75 list->last = prev;
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76 last->next = NULL;
77}
78
79static inline void wq_list_del(struct io_wq_work_list *list,
80 struct io_wq_work_node *node,
81 struct io_wq_work_node *prev)
82{
83 wq_list_cut(list, node, prev);
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84}
85
86#define wq_list_for_each(pos, prv, head) \
87 for (pos = (head)->first, prv = NULL; pos; prv = pos, pos = (pos)->next)
88
e995d512 89#define wq_list_empty(list) (READ_ONCE((list)->first) == NULL)
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90#define INIT_WQ_LIST(list) do { \
91 (list)->first = NULL; \
92 (list)->last = NULL; \
93} while (0)
94
771b53d0 95struct io_wq_work {
18a542ff 96 struct io_wq_work_node list;
98447d65 97 struct io_identity *identity;
6206f0e1 98 unsigned flags;
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99};
100
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101static inline struct io_wq_work *wq_next_work(struct io_wq_work *work)
102{
103 if (!work->list.next)
104 return NULL;
105
106 return container_of(work->list.next, struct io_wq_work, list);
107}
108
e9fd9396 109typedef void (free_work_fn)(struct io_wq_work *);
f4db7182 110typedef struct io_wq_work *(io_wq_work_fn)(struct io_wq_work *);
7d723065 111
576a347b 112struct io_wq_data {
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113 struct user_struct *user;
114
f5fa38c5 115 io_wq_work_fn *do_work;
e9fd9396 116 free_work_fn *free_work;
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117};
118
119struct io_wq *io_wq_create(unsigned bounded, struct io_wq_data *data);
eba6f5a3 120bool io_wq_get(struct io_wq *wq, struct io_wq_data *data);
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121void io_wq_destroy(struct io_wq *wq);
122
123void io_wq_enqueue(struct io_wq *wq, struct io_wq_work *work);
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124void io_wq_hash_work(struct io_wq_work *work, void *val);
125
126static inline bool io_wq_is_hashed(struct io_wq_work *work)
127{
128 return work->flags & IO_WQ_WORK_HASHED;
129}
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130
131void io_wq_cancel_all(struct io_wq *wq);
771b53d0 132
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133typedef bool (work_cancel_fn)(struct io_wq_work *, void *);
134
135enum io_wq_cancel io_wq_cancel_cb(struct io_wq *wq, work_cancel_fn *cancel,
4f26bda1 136 void *data, bool cancel_all);
62755e35 137
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138struct task_struct *io_wq_get_task(struct io_wq *wq);
139
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140#if defined(CONFIG_IO_WQ)
141extern void io_wq_worker_sleeping(struct task_struct *);
142extern void io_wq_worker_running(struct task_struct *);
143#else
144static inline void io_wq_worker_sleeping(struct task_struct *tsk)
145{
146}
147static inline void io_wq_worker_running(struct task_struct *tsk)
148{
149}
525b305d 150#endif
771b53d0 151
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152static inline bool io_wq_current_is_worker(void)
153{
154 return in_task() && (current->flags & PF_IO_WORKER);
155}
156#endif