summaryrefslogtreecommitdiffstats
path: root/fs/io-wq.h
blob: dd0af0d7376c2d5b03c5699aca50bcd5f57ecaee (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
#ifndef INTERNAL_IO_WQ_H
#define INTERNAL_IO_WQ_H

struct io_wq;

enum {
	IO_WQ_WORK_CANCEL	= 1,
	IO_WQ_WORK_HAS_MM	= 2,
	IO_WQ_WORK_HASHED	= 4,
	IO_WQ_WORK_NEEDS_USER	= 8,
	IO_WQ_WORK_NEEDS_FILES	= 16,
	IO_WQ_WORK_UNBOUND	= 32,
	IO_WQ_WORK_INTERNAL	= 64,
	IO_WQ_WORK_CB		= 128,

	IO_WQ_HASH_SHIFT	= 24,	/* upper 8 bits are used for hash key */
};

enum io_wq_cancel {
	IO_WQ_CANCEL_OK,	/* cancelled before started */
	IO_WQ_CANCEL_RUNNING,	/* found, running, and attempted cancelled */
	IO_WQ_CANCEL_NOTFOUND,	/* work not found */
};

struct io_wq_work_node {
	struct io_wq_work_node *next;
};

struct io_wq_work_list {
	struct io_wq_work_node *first;
	struct io_wq_work_node *last;
};

static inline void wq_list_add_tail(struct io_wq_work_node *node,
				    struct io_wq_work_list *list)
{
	if (!list->first) {
		list->first = list->last = node;
	} else {
		list->last->next = node;
		list->last = node;
	}
}

static inline void wq_node_del(struct io_wq_work_list *list,
			       struct io_wq_work_node *node,
			       struct io_wq_work_node *prev)
{
	if (node == list->first)
		list->first = node->next;
	if (node == list->last)
		list->last = prev;
	if (prev)
		prev->next = node->next;
}

#define wq_list_for_each(pos, prv, head)			\
	for (pos = (head)->first, prv = NULL; pos; prv = pos, pos = (pos)->next)

#define wq_list_empty(list)	((list)->first == NULL)
#define INIT_WQ_LIST(list)	do {				\
	(list)->first = NULL;					\
	(list)->last = NULL;					\
} while (0)

struct io_wq_work {
	union {
		struct io_wq_work_node list;
		void *data;
	};
	void (*func)(struct io_wq_work **);
	struct files_struct *files;
	unsigned flags;
};

#define INIT_IO_WORK(work, _func)			\
	do {						\
		(work)->list.next = NULL;		\
		(work)->func = _func;			\
		(work)->flags = 0;			\
		(work)->files = NULL;			\
	} while (0)					\

typedef void (get_work_fn)(struct io_wq_work *);
typedef void (put_work_fn)(struct io_wq_work *);

struct io_wq_data {
	struct mm_struct *mm;
	struct user_struct *user;
	const struct cred *creds;

	get_work_fn *get_work;
	put_work_fn *put_work;
};

struct io_wq *io_wq_create(unsigned bounded, struct io_wq_data *data);
void io_wq_destroy(struct io_wq *wq);

void io_wq_enqueue(struct io_wq *wq, struct io_wq_work *work);
void io_wq_enqueue_hashed(struct io_wq *wq, struct io_wq_work *work, void *val);
void io_wq_flush(struct io_wq *wq);

void io_wq_cancel_all(struct io_wq *wq);
enum io_wq_cancel io_wq_cancel_work(struct io_wq *wq, struct io_wq_work *cwork);

typedef bool (work_cancel_fn)(struct io_wq_work *, void *);

enum io_wq_cancel io_wq_cancel_cb(struct io_wq *wq, work_cancel_fn *cancel,
					void *data);

#if defined(CONFIG_IO_WQ)
extern void io_wq_worker_sleeping(struct task_struct *);
extern void io_wq_worker_running(struct task_struct *);
#else
static inline void io_wq_worker_sleeping(struct task_struct *tsk)
{
}
static inline void io_wq_worker_running(struct task_struct *tsk)
{
}
#endif

static inline bool io_wq_current_is_worker(void)
{
	return in_task() && (current->flags & PF_IO_WORKER);
}
#endif