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; |
fcb323cc | 88 | struct files_struct *files; |
cccf0ee8 JA |
89 | struct mm_struct *mm; |
90 | const struct cred *creds; | |
9392a27d | 91 | struct fs_struct *fs; |
6206f0e1 | 92 | unsigned flags; |
771b53d0 JA |
93 | }; |
94 | ||
86f3cd1b PB |
95 | static inline struct io_wq_work *wq_next_work(struct io_wq_work *work) |
96 | { | |
97 | if (!work->list.next) | |
98 | return NULL; | |
99 | ||
100 | return container_of(work->list.next, struct io_wq_work, list); | |
101 | } | |
102 | ||
e9fd9396 | 103 | typedef void (free_work_fn)(struct io_wq_work *); |
f5fa38c5 | 104 | typedef void (io_wq_work_fn)(struct io_wq_work **); |
7d723065 | 105 | |
576a347b | 106 | struct io_wq_data { |
576a347b JA |
107 | struct user_struct *user; |
108 | ||
f5fa38c5 | 109 | io_wq_work_fn *do_work; |
e9fd9396 | 110 | free_work_fn *free_work; |
576a347b JA |
111 | }; |
112 | ||
113 | struct io_wq *io_wq_create(unsigned bounded, struct io_wq_data *data); | |
eba6f5a3 | 114 | bool io_wq_get(struct io_wq *wq, struct io_wq_data *data); |
771b53d0 JA |
115 | void io_wq_destroy(struct io_wq *wq); |
116 | ||
117 | void io_wq_enqueue(struct io_wq *wq, struct io_wq_work *work); | |
8766dd51 PB |
118 | void io_wq_hash_work(struct io_wq_work *work, void *val); |
119 | ||
120 | static inline bool io_wq_is_hashed(struct io_wq_work *work) | |
121 | { | |
122 | return work->flags & IO_WQ_WORK_HASHED; | |
123 | } | |
771b53d0 JA |
124 | |
125 | void io_wq_cancel_all(struct io_wq *wq); | |
126 | enum io_wq_cancel io_wq_cancel_work(struct io_wq *wq, struct io_wq_work *cwork); | |
127 | ||
62755e35 JA |
128 | typedef bool (work_cancel_fn)(struct io_wq_work *, void *); |
129 | ||
130 | enum io_wq_cancel io_wq_cancel_cb(struct io_wq *wq, work_cancel_fn *cancel, | |
4f26bda1 | 131 | void *data, bool cancel_all); |
62755e35 | 132 | |
aa96bf8a JA |
133 | struct task_struct *io_wq_get_task(struct io_wq *wq); |
134 | ||
771b53d0 JA |
135 | #if defined(CONFIG_IO_WQ) |
136 | extern void io_wq_worker_sleeping(struct task_struct *); | |
137 | extern void io_wq_worker_running(struct task_struct *); | |
138 | #else | |
139 | static inline void io_wq_worker_sleeping(struct task_struct *tsk) | |
140 | { | |
141 | } | |
142 | static inline void io_wq_worker_running(struct task_struct *tsk) | |
143 | { | |
144 | } | |
525b305d | 145 | #endif |
771b53d0 | 146 | |
525b305d JA |
147 | static inline bool io_wq_current_is_worker(void) |
148 | { | |
149 | return in_task() && (current->flags & PF_IO_WORKER); | |
150 | } | |
151 | #endif |