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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#ifndef INTERNAL_IO_WQ_H
2#define INTERNAL_IO_WQ_H
3
4#include <linux/io_uring.h>
5
6struct io_wq;
7
8enum {
9 IO_WQ_WORK_CANCEL = 1,
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,
14
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,
20 IO_WQ_WORK_FSIZE = 1024,
21
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
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
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
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) {
56 list->last = node;
57 WRITE_ONCE(list->first, node);
58 } else {
59 list->last->next = node;
60 list->last = node;
61 }
62 node->next = NULL;
63}
64
65static inline void wq_list_cut(struct io_wq_work_list *list,
66 struct io_wq_work_node *last,
67 struct io_wq_work_node *prev)
68{
69 /* first in the list, if prev==NULL */
70 if (!prev)
71 WRITE_ONCE(list->first, last->next);
72 else
73 prev->next = last->next;
74
75 if (last == list->last)
76 list->last = prev;
77 last->next = NULL;
78}
79
80static inline void wq_list_del(struct io_wq_work_list *list,
81 struct io_wq_work_node *node,
82 struct io_wq_work_node *prev)
83{
84 wq_list_cut(list, node, prev);
85}
86
87#define wq_list_for_each(pos, prv, head) \
88 for (pos = (head)->first, prv = NULL; pos; prv = pos, pos = (pos)->next)
89
90#define wq_list_empty(list) (READ_ONCE((list)->first) == NULL)
91#define INIT_WQ_LIST(list) do { \
92 (list)->first = NULL; \
93 (list)->last = NULL; \
94} while (0)
95
96struct io_wq_work {
97 struct io_wq_work_node list;
98 struct io_identity *identity;
99 unsigned flags;
100};
101
102static inline struct io_wq_work *wq_next_work(struct io_wq_work *work)
103{
104 if (!work->list.next)
105 return NULL;
106
107 return container_of(work->list.next, struct io_wq_work, list);
108}
109
110typedef void (free_work_fn)(struct io_wq_work *);
111typedef struct io_wq_work *(io_wq_work_fn)(struct io_wq_work *);
112
113struct io_wq_data {
114 struct user_struct *user;
115
116 io_wq_work_fn *do_work;
117 free_work_fn *free_work;
118};
119
120struct io_wq *io_wq_create(unsigned bounded, struct io_wq_data *data);
121bool io_wq_get(struct io_wq *wq, struct io_wq_data *data);
122void io_wq_destroy(struct io_wq *wq);
123
124void io_wq_enqueue(struct io_wq *wq, struct io_wq_work *work);
125void io_wq_hash_work(struct io_wq_work *work, void *val);
126
127static inline bool io_wq_is_hashed(struct io_wq_work *work)
128{
129 return work->flags & IO_WQ_WORK_HASHED;
130}
131
132typedef bool (work_cancel_fn)(struct io_wq_work *, void *);
133
134enum io_wq_cancel io_wq_cancel_cb(struct io_wq *wq, work_cancel_fn *cancel,
135 void *data, bool cancel_all);
136
137struct task_struct *io_wq_get_task(struct io_wq *wq);
138
139#if defined(CONFIG_IO_WQ)
140extern void io_wq_worker_sleeping(struct task_struct *);
141extern void io_wq_worker_running(struct task_struct *);
142#else
143static inline void io_wq_worker_sleeping(struct task_struct *tsk)
144{
145}
146static inline void io_wq_worker_running(struct task_struct *tsk)
147{
148}
149#endif
150
151static inline bool io_wq_current_is_worker(void)
152{
153 return in_task() && (current->flags & PF_IO_WORKER);
154}
155#endif