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- #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;
- }
- void io_wq_cancel_all(struct io_wq *wq);
- 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
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