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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, | |
8 | IO_WQ_WORK_HAS_MM = 2, | |
9 | IO_WQ_WORK_HASHED = 4, | |
c5def4ab | 10 | IO_WQ_WORK_UNBOUND = 32, |
7d723065 | 11 | IO_WQ_WORK_INTERNAL = 64, |
b76da70f | 12 | IO_WQ_WORK_CB = 128, |
0c9d5ccd | 13 | IO_WQ_WORK_NO_CANCEL = 256, |
895e2ca0 | 14 | IO_WQ_WORK_CONCURRENT = 512, |
771b53d0 JA |
15 | |
16 | IO_WQ_HASH_SHIFT = 24, /* upper 8 bits are used for hash key */ | |
17 | }; | |
18 | ||
19 | enum 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 | ||
6206f0e1 JA |
25 | struct io_wq_work_node { |
26 | struct io_wq_work_node *next; | |
27 | }; | |
28 | ||
29 | struct io_wq_work_list { | |
30 | struct io_wq_work_node *first; | |
31 | struct io_wq_work_node *last; | |
32 | }; | |
33 | ||
34 | static inline void wq_list_add_tail(struct io_wq_work_node *node, | |
35 | struct io_wq_work_list *list) | |
36 | { | |
37 | if (!list->first) { | |
e995d512 JA |
38 | list->last = node; |
39 | WRITE_ONCE(list->first, node); | |
6206f0e1 JA |
40 | } else { |
41 | list->last->next = node; | |
42 | list->last = node; | |
43 | } | |
44 | } | |
45 | ||
46 | static 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); |
6206f0e1 JA |
52 | if (node == list->last) |
53 | list->last = prev; | |
54 | if (prev) | |
55 | prev->next = node->next; | |
08bdcc35 | 56 | node->next = NULL; |
6206f0e1 JA |
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) |
6206f0e1 JA |
63 | #define INIT_WQ_LIST(list) do { \ |
64 | (list)->first = NULL; \ | |
65 | (list)->last = NULL; \ | |
66 | } while (0) | |
67 | ||
771b53d0 | 68 | struct io_wq_work { |
b76da70f | 69 | union { |
6206f0e1 | 70 | struct io_wq_work_node list; |
b76da70f JA |
71 | void *data; |
72 | }; | |
771b53d0 | 73 | void (*func)(struct io_wq_work **); |
fcb323cc | 74 | struct files_struct *files; |
cccf0ee8 JA |
75 | struct mm_struct *mm; |
76 | const struct cred *creds; | |
9392a27d | 77 | struct fs_struct *fs; |
6206f0e1 | 78 | unsigned flags; |
36282881 | 79 | pid_t task_pid; |
771b53d0 JA |
80 | }; |
81 | ||
82 | #define INIT_IO_WORK(work, _func) \ | |
83 | do { \ | |
6206f0e1 | 84 | (work)->list.next = NULL; \ |
771b53d0 | 85 | (work)->func = _func; \ |
fcb323cc | 86 | (work)->files = NULL; \ |
cccf0ee8 JA |
87 | (work)->mm = NULL; \ |
88 | (work)->creds = NULL; \ | |
9392a27d JA |
89 | (work)->fs = NULL; \ |
90 | (work)->flags = 0; \ | |
771b53d0 JA |
91 | } while (0) \ |
92 | ||
7d723065 JA |
93 | typedef void (get_work_fn)(struct io_wq_work *); |
94 | typedef void (put_work_fn)(struct io_wq_work *); | |
95 | ||
576a347b | 96 | struct io_wq_data { |
576a347b JA |
97 | struct user_struct *user; |
98 | ||
99 | get_work_fn *get_work; | |
100 | put_work_fn *put_work; | |
101 | }; | |
102 | ||
103 | struct io_wq *io_wq_create(unsigned bounded, struct io_wq_data *data); | |
eba6f5a3 | 104 | bool io_wq_get(struct io_wq *wq, struct io_wq_data *data); |
771b53d0 JA |
105 | void io_wq_destroy(struct io_wq *wq); |
106 | ||
107 | void io_wq_enqueue(struct io_wq *wq, struct io_wq_work *work); | |
108 | void io_wq_enqueue_hashed(struct io_wq *wq, struct io_wq_work *work, void *val); | |
109 | void io_wq_flush(struct io_wq *wq); | |
110 | ||
111 | void io_wq_cancel_all(struct io_wq *wq); | |
112 | enum io_wq_cancel io_wq_cancel_work(struct io_wq *wq, struct io_wq_work *cwork); | |
36282881 | 113 | enum io_wq_cancel io_wq_cancel_pid(struct io_wq *wq, pid_t pid); |
771b53d0 | 114 | |
62755e35 JA |
115 | typedef bool (work_cancel_fn)(struct io_wq_work *, void *); |
116 | ||
117 | enum io_wq_cancel io_wq_cancel_cb(struct io_wq *wq, work_cancel_fn *cancel, | |
118 | void *data); | |
119 | ||
771b53d0 JA |
120 | #if defined(CONFIG_IO_WQ) |
121 | extern void io_wq_worker_sleeping(struct task_struct *); | |
122 | extern void io_wq_worker_running(struct task_struct *); | |
123 | #else | |
124 | static inline void io_wq_worker_sleeping(struct task_struct *tsk) | |
125 | { | |
126 | } | |
127 | static inline void io_wq_worker_running(struct task_struct *tsk) | |
128 | { | |
129 | } | |
525b305d | 130 | #endif |
771b53d0 | 131 | |
525b305d JA |
132 | static inline bool io_wq_current_is_worker(void) |
133 | { | |
134 | return in_task() && (current->flags & PF_IO_WORKER); | |
135 | } | |
136 | #endif |