1 #ifndef INTERNAL_IO_WQ_H
2 #define INTERNAL_IO_WQ_H
3
4 #include <linux/refcount.h>
5
6 struct io_wq;
7
8 enum {
9 IO_WQ_WORK_CANCEL = 1,
10 IO_WQ_WORK_HASHED = 2,
11 IO_WQ_WORK_UNBOUND = 4,
12 IO_WQ_WORK_CONCURRENT = 16,
13
14 IO_WQ_HASH_SHIFT = 24, /* upper 8 bits are used for hash key */
15 };
16
17 enum io_wq_cancel {
18 IO_WQ_CANCEL_OK, /* cancelled before started */
19 IO_WQ_CANCEL_RUNNING, /* found, running, and attempted cancelled */
20 IO_WQ_CANCEL_NOTFOUND, /* work not found */
21 };
22
23 struct io_wq_work_node {
24 struct io_wq_work_node *next;
25 };
26
27 struct io_wq_work_list {
28 struct io_wq_work_node *first;
29 struct io_wq_work_node *last;
30 };
31
wq_list_add_after(struct io_wq_work_node * node,struct io_wq_work_node * pos,struct io_wq_work_list * list)32 static inline void wq_list_add_after(struct io_wq_work_node *node,
33 struct io_wq_work_node *pos,
34 struct io_wq_work_list *list)
35 {
36 struct io_wq_work_node *next = pos->next;
37
38 pos->next = node;
39 node->next = next;
40 if (!next)
41 list->last = node;
42 }
43
wq_list_add_tail(struct io_wq_work_node * node,struct io_wq_work_list * list)44 static inline void wq_list_add_tail(struct io_wq_work_node *node,
45 struct io_wq_work_list *list)
46 {
47 if (!list->first) {
48 list->last = node;
49 WRITE_ONCE(list->first, node);
50 } else {
51 list->last->next = node;
52 list->last = node;
53 }
54 node->next = NULL;
55 }
56
wq_list_cut(struct io_wq_work_list * list,struct io_wq_work_node * last,struct io_wq_work_node * prev)57 static inline void wq_list_cut(struct io_wq_work_list *list,
58 struct io_wq_work_node *last,
59 struct io_wq_work_node *prev)
60 {
61 /* first in the list, if prev==NULL */
62 if (!prev)
63 WRITE_ONCE(list->first, last->next);
64 else
65 prev->next = last->next;
66
67 if (last == list->last)
68 list->last = prev;
69 last->next = NULL;
70 }
71
wq_list_del(struct io_wq_work_list * list,struct io_wq_work_node * node,struct io_wq_work_node * prev)72 static inline void wq_list_del(struct io_wq_work_list *list,
73 struct io_wq_work_node *node,
74 struct io_wq_work_node *prev)
75 {
76 wq_list_cut(list, node, prev);
77 }
78
79 #define wq_list_for_each(pos, prv, head) \
80 for (pos = (head)->first, prv = NULL; pos; prv = pos, pos = (pos)->next)
81
82 #define wq_list_empty(list) (READ_ONCE((list)->first) == NULL)
83 #define INIT_WQ_LIST(list) do { \
84 (list)->first = NULL; \
85 (list)->last = NULL; \
86 } while (0)
87
88 struct io_wq_work {
89 struct io_wq_work_node list;
90 const struct cred *creds;
91 unsigned flags;
92 };
93
wq_next_work(struct io_wq_work * work)94 static inline struct io_wq_work *wq_next_work(struct io_wq_work *work)
95 {
96 if (!work->list.next)
97 return NULL;
98
99 return container_of(work->list.next, struct io_wq_work, list);
100 }
101
102 typedef struct io_wq_work *(free_work_fn)(struct io_wq_work *);
103 typedef void (io_wq_work_fn)(struct io_wq_work *);
104
105 struct io_wq_hash {
106 refcount_t refs;
107 unsigned long map;
108 struct wait_queue_head wait;
109 };
110
io_wq_put_hash(struct io_wq_hash * hash)111 static inline void io_wq_put_hash(struct io_wq_hash *hash)
112 {
113 if (refcount_dec_and_test(&hash->refs))
114 kfree(hash);
115 }
116
117 struct io_wq_data {
118 struct io_wq_hash *hash;
119 struct task_struct *task;
120 io_wq_work_fn *do_work;
121 free_work_fn *free_work;
122 };
123
124 struct io_wq *io_wq_create(unsigned bounded, struct io_wq_data *data);
125 void io_wq_put(struct io_wq *wq);
126 void io_wq_put_and_exit(struct io_wq *wq);
127
128 void io_wq_enqueue(struct io_wq *wq, struct io_wq_work *work);
129 void io_wq_hash_work(struct io_wq_work *work, void *val);
130
io_wq_is_hashed(struct io_wq_work * work)131 static inline bool io_wq_is_hashed(struct io_wq_work *work)
132 {
133 return work->flags & IO_WQ_WORK_HASHED;
134 }
135
136 typedef bool (work_cancel_fn)(struct io_wq_work *, void *);
137
138 enum io_wq_cancel io_wq_cancel_cb(struct io_wq *wq, work_cancel_fn *cancel,
139 void *data, bool cancel_all);
140
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
io_wq_worker_sleeping(struct task_struct * tsk)145 static inline void io_wq_worker_sleeping(struct task_struct *tsk)
146 {
147 }
io_wq_worker_running(struct task_struct * tsk)148 static inline void io_wq_worker_running(struct task_struct *tsk)
149 {
150 }
151 #endif
152
io_wq_current_is_worker(void)153 static inline bool io_wq_current_is_worker(void)
154 {
155 return in_task() && (current->flags & PF_IO_WORKER) &&
156 current->pf_io_worker;
157 }
158 #endif
159