[linux.git] / fs / io-wq.h

#ifndef INTERNAL_IO_WQ_H
#define INTERNAL_IO_WQ_H

#include <linux/refcount.h>

struct io_wq;

enum {
	IO_WQ_WORK_CANCEL	= 1,
	IO_WQ_WORK_HASHED	= 2,
	IO_WQ_WORK_UNBOUND	= 4,
	IO_WQ_WORK_CONCURRENT	= 16,

	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_after(struct io_wq_work_node *node,
				     struct io_wq_work_node *pos,
				     struct io_wq_work_list *list)
{
	struct io_wq_work_node *next = pos->next;

	pos->next = node;
	node->next = next;
	if (!next)
		list->last = node;
}

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

static inline void wq_list_cut(struct io_wq_work_list *list,
			       struct io_wq_work_node *last,
			       struct io_wq_work_node *prev)
{
	/* first in the list, if prev==NULL */
	if (!prev)
		WRITE_ONCE(list->first, last->next);
	else
		prev->next = last->next;

	if (last == list->last)
		list->last = prev;
	last->next = NULL;
}

static inline void wq_list_del(struct io_wq_work_list *list,
			       struct io_wq_work_node *node,
			       struct io_wq_work_node *prev)
{
	wq_list_cut(list, node, prev);
}

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

struct io_wq_work {
	struct io_wq_work_node list;
	const struct cred *creds;
	unsigned flags;
};

static inline struct io_wq_work *wq_next_work(struct io_wq_work *work)
{
	if (!work->list.next)
		return NULL;

	return container_of(work->list.next, struct io_wq_work, list);
}

typedef struct io_wq_work *(free_work_fn)(struct io_wq_work *);
typedef void (io_wq_work_fn)(struct io_wq_work *);

struct io_wq_hash {
	refcount_t refs;
	unsigned long map;
	struct wait_queue_head wait;
};

static inline void io_wq_put_hash(struct io_wq_hash *hash)
{
	if (refcount_dec_and_test(&hash->refs))
		kfree(hash);
}

struct io_wq_data {
	struct io_wq_hash *hash;
	io_wq_work_fn *do_work;
	free_work_fn *free_work;
};

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

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

static inline bool io_wq_is_hashed(struct io_wq_work *work)
{
	return work->flags & IO_WQ_WORK_HASHED;
}

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, bool cancel_all);

#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) &&
		current->pf_io_worker;
}
#endif
Commit	Line	Data
771b53d0 JA	1	#ifndef INTERNAL_IO_WQ_H
	2	#define INTERNAL_IO_WQ_H
	3
e941894e	4	#include <linux/refcount.h>
98447d65	5
771b53d0 JA	6	struct io_wq;
	7
	8	enum {
	9	IO_WQ_WORK_CANCEL = 1,
e883a79d PB	10	IO_WQ_WORK_HASHED = 2,
e883a79d PB	11	IO_WQ_WORK_UNBOUND = 4,
e883a79d	12	IO_WQ_WORK_CONCURRENT = 16,
771b53d0 JA	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
53e043b2 SM	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
86f3cd1b PB	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
6206f0e1 JA	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) {
e995d512 JA	48	list->last = node;
e995d512 JA	49	WRITE_ONCE(list->first, node);
6206f0e1 JA	50	} else {
	51	list->last->next = node;
	52	list->last = node;
	53	}
0020ef04	54	node->next = NULL;
6206f0e1 JA	55	}
6206f0e1 JA	56
86f3cd1b PB	57	static inline void wq_list_cut(struct io_wq_work_list *list,
86f3cd1b PB	58	struct io_wq_work_node *last,
6206f0e1 JA	59	struct io_wq_work_node *prev)
6206f0e1 JA	60	{
86f3cd1b PB	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)
6206f0e1	68	list->last = prev;
86f3cd1b PB	69	last->next = NULL;
	70	}
	71
	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);
6206f0e1 JA	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
e995d512	82	#define wq_list_empty(list) (READ_ONCE((list)->first) == NULL)
6206f0e1 JA	83	#define INIT_WQ_LIST(list) do { \
	84	(list)->first = NULL; \
	85	(list)->last = NULL; \
	86	} while (0)
	87
771b53d0	88	struct io_wq_work {
18a542ff	89	struct io_wq_work_node list;
003e8dcc	90	const struct cred *creds;
6206f0e1	91	unsigned flags;
771b53d0 JA	92	};
771b53d0 JA	93
86f3cd1b PB	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
5280f7e5 PB	102	typedef struct io_wq_work (free_work_fn)(struct io_wq_work );
5280f7e5 PB	103	typedef void (io_wq_work_fn)(struct io_wq_work *);
7d723065	104
e941894e JA	105	struct io_wq_hash {
	106	refcount_t refs;
	107	unsigned long map;
	108	struct wait_queue_head wait;
	109	};
	110
	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
576a347b	117	struct io_wq_data {
e941894e	118	struct io_wq_hash *hash;
f5fa38c5	119	io_wq_work_fn *do_work;
e9fd9396	120	free_work_fn *free_work;
576a347b JA	121	};
	122
	123	struct io_wq io_wq_create(unsigned bounded, struct io_wq_data data);
4fb6ac32	124	void io_wq_put(struct io_wq *wq);
afcc4015	125	void io_wq_put_and_exit(struct io_wq *wq);
771b53d0 JA	126
771b53d0 JA	127	void io_wq_enqueue(struct io_wq wq, struct io_wq_work work);
8766dd51 PB	128	void io_wq_hash_work(struct io_wq_work work, void val);
	129
	130	static inline bool io_wq_is_hashed(struct io_wq_work *work)
	131	{
	132	return work->flags & IO_WQ_WORK_HASHED;
	133	}
771b53d0	134
62755e35 JA	135	typedef bool (work_cancel_fn)(struct io_wq_work , void );
	136
	137	enum io_wq_cancel io_wq_cancel_cb(struct io_wq wq, work_cancel_fn cancel,
4f26bda1	138	void *data, bool cancel_all);
62755e35	139
771b53d0 JA	140	#if defined(CONFIG_IO_WQ)
	141	extern void io_wq_worker_sleeping(struct task_struct *);
	142	extern void io_wq_worker_running(struct task_struct *);
	143	#else
	144	static inline void io_wq_worker_sleeping(struct task_struct *tsk)
	145	{
	146	}
	147	static inline void io_wq_worker_running(struct task_struct *tsk)
	148	{
	149	}
525b305d	150	#endif
771b53d0	151
525b305d JA	152	static inline bool io_wq_current_is_worker(void)
525b305d JA	153	{
3bfe6106 JA	154	return in_task() && (current->flags & PF_IO_WORKER) &&
3bfe6106 JA	155	current->pf_io_worker;
525b305d JA	156	}
525b305d JA	157	#endif