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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
4struct io_wq;
5
6enum {
7 IO_WQ_WORK_CANCEL = 1,
8 IO_WQ_WORK_HASHED = 2,
9 IO_WQ_WORK_UNBOUND = 4,
10 IO_WQ_WORK_NO_CANCEL = 8,
11 IO_WQ_WORK_CONCURRENT = 16,
12
13 IO_WQ_HASH_SHIFT = 24, /* upper 8 bits are used for hash key */
14};
15
16enum 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
22struct io_wq_work_node {
23 struct io_wq_work_node *next;
24};
25
26struct io_wq_work_list {
27 struct io_wq_work_node *first;
28 struct io_wq_work_node *last;
29};
30
31static 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
43static inline void wq_list_add_tail(struct io_wq_work_node *node,
44 struct io_wq_work_list *list)
45{
46 if (!list->first) {
47 list->last = node;
48 WRITE_ONCE(list->first, node);
49 } else {
50 list->last->next = node;
51 list->last = node;
52 }
53}
54
55static inline void wq_list_cut(struct io_wq_work_list *list,
56 struct io_wq_work_node *last,
57 struct io_wq_work_node *prev)
58{
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)
66 list->last = prev;
67 last->next = NULL;
68}
69
70static 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);
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
80#define wq_list_empty(list) (READ_ONCE((list)->first) == NULL)
81#define INIT_WQ_LIST(list) do { \
82 (list)->first = NULL; \
83 (list)->last = NULL; \
84} while (0)
85
86struct io_wq_work {
87 struct io_wq_work_node list;
88 struct files_struct *files;
89 struct mm_struct *mm;
90 const struct cred *creds;
91 struct fs_struct *fs;
92 unsigned long fsize;
93 unsigned flags;
94};
95
96static inline struct io_wq_work *wq_next_work(struct io_wq_work *work)
97{
98 if (!work->list.next)
99 return NULL;
100
101 return container_of(work->list.next, struct io_wq_work, list);
102}
103
104typedef void (free_work_fn)(struct io_wq_work *);
105typedef struct io_wq_work *(io_wq_work_fn)(struct io_wq_work *);
106
107struct io_wq_data {
108 struct user_struct *user;
109
110 io_wq_work_fn *do_work;
111 free_work_fn *free_work;
112};
113
114struct io_wq *io_wq_create(unsigned bounded, struct io_wq_data *data);
115bool io_wq_get(struct io_wq *wq, struct io_wq_data *data);
116void io_wq_destroy(struct io_wq *wq);
117
118void io_wq_enqueue(struct io_wq *wq, struct io_wq_work *work);
119void io_wq_hash_work(struct io_wq_work *work, void *val);
120
121static inline bool io_wq_is_hashed(struct io_wq_work *work)
122{
123 return work->flags & IO_WQ_WORK_HASHED;
124}
125
126void io_wq_cancel_all(struct io_wq *wq);
127enum io_wq_cancel io_wq_cancel_work(struct io_wq *wq, struct io_wq_work *cwork);
128
129typedef bool (work_cancel_fn)(struct io_wq_work *, void *);
130
131enum io_wq_cancel io_wq_cancel_cb(struct io_wq *wq, work_cancel_fn *cancel,
132 void *data, bool cancel_all);
133
134struct task_struct *io_wq_get_task(struct io_wq *wq);
135
136#if defined(CONFIG_IO_WQ)
137extern void io_wq_worker_sleeping(struct task_struct *);
138extern void io_wq_worker_running(struct task_struct *);
139#else
140static inline void io_wq_worker_sleeping(struct task_struct *tsk)
141{
142}
143static inline void io_wq_worker_running(struct task_struct *tsk)
144{
145}
146#endif
147
148static inline bool io_wq_current_is_worker(void)
149{
150 return in_task() && (current->flags & PF_IO_WORKER);
151}
152#endif