[mirror_ubuntu-hirsute-kernel.git] / fs / io-wq.h

#ifndef INTERNAL_IO_WQ_H
#define INTERNAL_IO_WQ_H

#include <linux/io_uring.h>

struct io_wq;

enum {
	IO_WQ_WORK_CANCEL	= 1,
	IO_WQ_WORK_HASHED	= 2,
	IO_WQ_WORK_UNBOUND	= 4,
	IO_WQ_WORK_NO_CANCEL	= 8,
	IO_WQ_WORK_CONCURRENT	= 16,

	IO_WQ_WORK_FILES	= 32,
	IO_WQ_WORK_FS		= 64,
	IO_WQ_WORK_MM		= 128,
	IO_WQ_WORK_CREDS	= 256,
	IO_WQ_WORK_BLKCG	= 512,
	IO_WQ_WORK_FSIZE	= 1024,

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

struct io_wq_data {
	struct user_struct *user;

	io_wq_work_fn *do_work;
	free_work_fn *free_work;
};

struct io_wq *io_wq_create(unsigned bounded, struct io_wq_data *data);
bool io_wq_get(struct io_wq *wq, 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_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);

struct task_struct *io_wq_get_task(struct io_wq *wq);

#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
Commit	Line	Data
771b53d0 JA	1	#ifndef INTERNAL_IO_WQ_H
	2	#define INTERNAL_IO_WQ_H
	3
98447d65 JA	4	#include <linux/io_uring.h>
98447d65 JA	5
771b53d0 JA	6	struct io_wq;
	7
	8	enum {
	9	IO_WQ_WORK_CANCEL = 1,
e883a79d PB	10	IO_WQ_WORK_HASHED = 2,
	11	IO_WQ_WORK_UNBOUND = 4,
	12	IO_WQ_WORK_NO_CANCEL = 8,
	13	IO_WQ_WORK_CONCURRENT = 16,
771b53d0	14
0f203765 JA	15	IO_WQ_WORK_FILES = 32,
	16	IO_WQ_WORK_FS = 64,
	17	IO_WQ_WORK_MM = 128,
	18	IO_WQ_WORK_CREDS = 256,
	19	IO_WQ_WORK_BLKCG = 512,
69228338	20	IO_WQ_WORK_FSIZE = 1024,
0f203765	21
771b53d0 JA	22	IO_WQ_HASH_SHIFT = 24, /* upper 8 bits are used for hash key */
	23	};
	24
	25	enum io_wq_cancel {
	26	IO_WQ_CANCEL_OK, /* cancelled before started */
	27	IO_WQ_CANCEL_RUNNING, /* found, running, and attempted cancelled */
	28	IO_WQ_CANCEL_NOTFOUND, /* work not found */
	29	};
	30
6206f0e1 JA	31	struct io_wq_work_node {
	32	struct io_wq_work_node *next;
	33	};
	34
	35	struct io_wq_work_list {
	36	struct io_wq_work_node *first;
	37	struct io_wq_work_node *last;
	38	};
	39
86f3cd1b PB	40	static inline void wq_list_add_after(struct io_wq_work_node *node,
	41	struct io_wq_work_node *pos,
	42	struct io_wq_work_list *list)
	43	{
	44	struct io_wq_work_node *next = pos->next;
	45
	46	pos->next = node;
	47	node->next = next;
	48	if (!next)
	49	list->last = node;
	50	}
	51
6206f0e1 JA	52	static inline void wq_list_add_tail(struct io_wq_work_node *node,
	53	struct io_wq_work_list *list)
	54	{
	55	if (!list->first) {
e995d512 JA	56	list->last = node;
e995d512 JA	57	WRITE_ONCE(list->first, node);
6206f0e1 JA	58	} else {
	59	list->last->next = node;
	60	list->last = node;
	61	}
0020ef04	62	node->next = NULL;
6206f0e1 JA	63	}
6206f0e1 JA	64
86f3cd1b PB	65	static inline void wq_list_cut(struct io_wq_work_list *list,
86f3cd1b PB	66	struct io_wq_work_node *last,
6206f0e1 JA	67	struct io_wq_work_node *prev)
6206f0e1 JA	68	{
86f3cd1b PB	69	/* first in the list, if prev==NULL */
	70	if (!prev)
	71	WRITE_ONCE(list->first, last->next);
	72	else
	73	prev->next = last->next;
	74
	75	if (last == list->last)
6206f0e1	76	list->last = prev;
86f3cd1b PB	77	last->next = NULL;
	78	}
	79
	80	static inline void wq_list_del(struct io_wq_work_list *list,
	81	struct io_wq_work_node *node,
	82	struct io_wq_work_node *prev)
	83	{
	84	wq_list_cut(list, node, prev);
6206f0e1 JA	85	}
	86
	87	#define wq_list_for_each(pos, prv, head) \
	88	for (pos = (head)->first, prv = NULL; pos; prv = pos, pos = (pos)->next)
	89
e995d512	90	#define wq_list_empty(list) (READ_ONCE((list)->first) == NULL)
6206f0e1 JA	91	#define INIT_WQ_LIST(list) do { \
	92	(list)->first = NULL; \
	93	(list)->last = NULL; \
	94	} while (0)
	95
771b53d0	96	struct io_wq_work {
18a542ff	97	struct io_wq_work_node list;
98447d65	98	struct io_identity *identity;
6206f0e1	99	unsigned flags;
771b53d0 JA	100	};
771b53d0 JA	101
86f3cd1b PB	102	static inline struct io_wq_work wq_next_work(struct io_wq_work work)
	103	{
	104	if (!work->list.next)
	105	return NULL;
	106
	107	return container_of(work->list.next, struct io_wq_work, list);
	108	}
	109
e9fd9396	110	typedef void (free_work_fn)(struct io_wq_work *);
f4db7182	111	typedef struct io_wq_work (io_wq_work_fn)(struct io_wq_work );
7d723065	112
576a347b	113	struct io_wq_data {
576a347b JA	114	struct user_struct *user;
576a347b JA	115
f5fa38c5	116	io_wq_work_fn *do_work;
e9fd9396	117	free_work_fn *free_work;
576a347b JA	118	};
	119
	120	struct io_wq io_wq_create(unsigned bounded, struct io_wq_data data);
eba6f5a3	121	bool io_wq_get(struct io_wq wq, struct io_wq_data data);
771b53d0 JA	122	void io_wq_destroy(struct io_wq *wq);
	123
	124	void io_wq_enqueue(struct io_wq wq, struct io_wq_work work);
8766dd51 PB	125	void io_wq_hash_work(struct io_wq_work work, void val);
	126
	127	static inline bool io_wq_is_hashed(struct io_wq_work *work)
	128	{
	129	return work->flags & IO_WQ_WORK_HASHED;
	130	}
771b53d0	131
62755e35 JA	132	typedef bool (work_cancel_fn)(struct io_wq_work , void );
	133
	134	enum io_wq_cancel io_wq_cancel_cb(struct io_wq wq, work_cancel_fn cancel,
4f26bda1	135	void *data, bool cancel_all);
62755e35	136
aa96bf8a JA	137	struct task_struct io_wq_get_task(struct io_wq wq);
aa96bf8a JA	138
771b53d0 JA	139	#if defined(CONFIG_IO_WQ)
	140	extern void io_wq_worker_sleeping(struct task_struct *);
	141	extern void io_wq_worker_running(struct task_struct *);
	142	#else
	143	static inline void io_wq_worker_sleeping(struct task_struct *tsk)
	144	{
	145	}
	146	static inline void io_wq_worker_running(struct task_struct *tsk)
	147	{
	148	}
525b305d	149	#endif
771b53d0	150
525b305d JA	151	static inline bool io_wq_current_is_worker(void)
	152	{
	153	return in_task() && (current->flags & PF_IO_WORKER);
	154	}
	155	#endif