Commit | Line | Data |
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771b53d0 JA |
1 | #ifndef INTERNAL_IO_WQ_H |
2 | #define INTERNAL_IO_WQ_H | |
3 | ||
4 | struct io_wq; | |
5 | ||
6 | enum { | |
7 | IO_WQ_WORK_CANCEL = 1, | |
771b53d0 | 8 | IO_WQ_WORK_HASHED = 4, |
c5def4ab | 9 | IO_WQ_WORK_UNBOUND = 32, |
0c9d5ccd | 10 | IO_WQ_WORK_NO_CANCEL = 256, |
895e2ca0 | 11 | IO_WQ_WORK_CONCURRENT = 512, |
771b53d0 JA |
12 | |
13 | IO_WQ_HASH_SHIFT = 24, /* upper 8 bits are used for hash key */ | |
14 | }; | |
15 | ||
16 | enum io_wq_cancel { | |
17 | IO_WQ_CANCEL_OK, /* cancelled before started */ | |
18 | IO_WQ_CANCEL_RUNNING, /* found, running, and attempted cancelled */ | |
19 | IO_WQ_CANCEL_NOTFOUND, /* work not found */ | |
20 | }; | |
21 | ||
6206f0e1 JA |
22 | struct io_wq_work_node { |
23 | struct io_wq_work_node *next; | |
24 | }; | |
25 | ||
26 | struct io_wq_work_list { | |
27 | struct io_wq_work_node *first; | |
28 | struct io_wq_work_node *last; | |
29 | }; | |
30 | ||
86f3cd1b PB |
31 | static inline void wq_list_add_after(struct io_wq_work_node *node, |
32 | struct io_wq_work_node *pos, | |
33 | struct io_wq_work_list *list) | |
34 | { | |
35 | struct io_wq_work_node *next = pos->next; | |
36 | ||
37 | pos->next = node; | |
38 | node->next = next; | |
39 | if (!next) | |
40 | list->last = node; | |
41 | } | |
42 | ||
6206f0e1 JA |
43 | static inline void wq_list_add_tail(struct io_wq_work_node *node, |
44 | struct io_wq_work_list *list) | |
45 | { | |
46 | if (!list->first) { | |
e995d512 JA |
47 | list->last = node; |
48 | WRITE_ONCE(list->first, node); | |
6206f0e1 JA |
49 | } else { |
50 | list->last->next = node; | |
51 | list->last = node; | |
52 | } | |
53 | } | |
54 | ||
86f3cd1b PB |
55 | static inline void wq_list_cut(struct io_wq_work_list *list, |
56 | struct io_wq_work_node *last, | |
6206f0e1 JA |
57 | struct io_wq_work_node *prev) |
58 | { | |
86f3cd1b PB |
59 | /* first in the list, if prev==NULL */ |
60 | if (!prev) | |
61 | WRITE_ONCE(list->first, last->next); | |
62 | else | |
63 | prev->next = last->next; | |
64 | ||
65 | if (last == list->last) | |
6206f0e1 | 66 | list->last = prev; |
86f3cd1b PB |
67 | last->next = NULL; |
68 | } | |
69 | ||
70 | static inline void wq_list_del(struct io_wq_work_list *list, | |
71 | struct io_wq_work_node *node, | |
72 | struct io_wq_work_node *prev) | |
73 | { | |
74 | wq_list_cut(list, node, prev); | |
6206f0e1 JA |
75 | } |
76 | ||
77 | #define wq_list_for_each(pos, prv, head) \ | |
78 | for (pos = (head)->first, prv = NULL; pos; prv = pos, pos = (pos)->next) | |
79 | ||
e995d512 | 80 | #define wq_list_empty(list) (READ_ONCE((list)->first) == NULL) |
6206f0e1 JA |
81 | #define INIT_WQ_LIST(list) do { \ |
82 | (list)->first = NULL; \ | |
83 | (list)->last = NULL; \ | |
84 | } while (0) | |
85 | ||
771b53d0 | 86 | struct io_wq_work { |
18a542ff | 87 | struct io_wq_work_node list; |
771b53d0 | 88 | void (*func)(struct io_wq_work **); |
fcb323cc | 89 | struct files_struct *files; |
cccf0ee8 JA |
90 | struct mm_struct *mm; |
91 | const struct cred *creds; | |
9392a27d | 92 | struct fs_struct *fs; |
6206f0e1 | 93 | unsigned flags; |
36282881 | 94 | pid_t task_pid; |
771b53d0 JA |
95 | }; |
96 | ||
2d141dd2 JA |
97 | #define INIT_IO_WORK(work, _func) \ |
98 | do { \ | |
99 | *(work) = (struct io_wq_work){ .func = _func }; \ | |
100 | } while (0) \ | |
771b53d0 | 101 | |
86f3cd1b PB |
102 | static 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 | ||
e9fd9396 | 110 | typedef void (free_work_fn)(struct io_wq_work *); |
7d723065 | 111 | |
576a347b | 112 | struct io_wq_data { |
576a347b JA |
113 | struct user_struct *user; |
114 | ||
e9fd9396 | 115 | free_work_fn *free_work; |
576a347b JA |
116 | }; |
117 | ||
118 | struct io_wq *io_wq_create(unsigned bounded, struct io_wq_data *data); | |
eba6f5a3 | 119 | bool io_wq_get(struct io_wq *wq, struct io_wq_data *data); |
771b53d0 JA |
120 | void io_wq_destroy(struct io_wq *wq); |
121 | ||
122 | void io_wq_enqueue(struct io_wq *wq, struct io_wq_work *work); | |
8766dd51 PB |
123 | void io_wq_hash_work(struct io_wq_work *work, void *val); |
124 | ||
125 | static inline bool io_wq_is_hashed(struct io_wq_work *work) | |
126 | { | |
127 | return work->flags & IO_WQ_WORK_HASHED; | |
128 | } | |
771b53d0 JA |
129 | |
130 | void io_wq_cancel_all(struct io_wq *wq); | |
131 | enum io_wq_cancel io_wq_cancel_work(struct io_wq *wq, struct io_wq_work *cwork); | |
36282881 | 132 | enum io_wq_cancel io_wq_cancel_pid(struct io_wq *wq, pid_t pid); |
771b53d0 | 133 | |
62755e35 JA |
134 | typedef bool (work_cancel_fn)(struct io_wq_work *, void *); |
135 | ||
136 | enum io_wq_cancel io_wq_cancel_cb(struct io_wq *wq, work_cancel_fn *cancel, | |
137 | void *data); | |
138 | ||
aa96bf8a JA |
139 | struct task_struct *io_wq_get_task(struct io_wq *wq); |
140 | ||
771b53d0 JA |
141 | #if defined(CONFIG_IO_WQ) |
142 | extern void io_wq_worker_sleeping(struct task_struct *); | |
143 | extern void io_wq_worker_running(struct task_struct *); | |
144 | #else | |
145 | static inline void io_wq_worker_sleeping(struct task_struct *tsk) | |
146 | { | |
147 | } | |
148 | static inline void io_wq_worker_running(struct task_struct *tsk) | |
149 | { | |
150 | } | |
525b305d | 151 | #endif |
771b53d0 | 152 | |
525b305d JA |
153 | static inline bool io_wq_current_is_worker(void) |
154 | { | |
155 | return in_task() && (current->flags & PF_IO_WORKER); | |
156 | } | |
157 | #endif |