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e995d5123e
To avoid going to sleep only to get woken shortly thereafter, spin briefly for new work upon completion of work. Signed-off-by: Jens Axboe <axboe@kernel.dk>
126 lines
3.0 KiB
C
126 lines
3.0 KiB
C
#ifndef INTERNAL_IO_WQ_H
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#define INTERNAL_IO_WQ_H
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struct io_wq;
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enum {
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IO_WQ_WORK_CANCEL = 1,
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IO_WQ_WORK_HAS_MM = 2,
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IO_WQ_WORK_HASHED = 4,
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IO_WQ_WORK_NEEDS_USER = 8,
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IO_WQ_WORK_NEEDS_FILES = 16,
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IO_WQ_WORK_UNBOUND = 32,
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IO_WQ_WORK_INTERNAL = 64,
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IO_WQ_WORK_CB = 128,
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IO_WQ_HASH_SHIFT = 24, /* upper 8 bits are used for hash key */
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};
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enum io_wq_cancel {
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IO_WQ_CANCEL_OK, /* cancelled before started */
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IO_WQ_CANCEL_RUNNING, /* found, running, and attempted cancelled */
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IO_WQ_CANCEL_NOTFOUND, /* work not found */
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};
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struct io_wq_work_node {
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struct io_wq_work_node *next;
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};
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struct io_wq_work_list {
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struct io_wq_work_node *first;
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struct io_wq_work_node *last;
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};
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static inline void wq_list_add_tail(struct io_wq_work_node *node,
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struct io_wq_work_list *list)
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{
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if (!list->first) {
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list->last = node;
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WRITE_ONCE(list->first, node);
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} else {
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list->last->next = node;
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list->last = node;
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}
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}
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static inline void wq_node_del(struct io_wq_work_list *list,
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struct io_wq_work_node *node,
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struct io_wq_work_node *prev)
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{
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if (node == list->first)
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WRITE_ONCE(list->first, node->next);
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if (node == list->last)
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list->last = prev;
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if (prev)
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prev->next = node->next;
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node->next = NULL;
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}
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#define wq_list_for_each(pos, prv, head) \
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for (pos = (head)->first, prv = NULL; pos; prv = pos, pos = (pos)->next)
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#define wq_list_empty(list) (READ_ONCE((list)->first) == NULL)
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#define INIT_WQ_LIST(list) do { \
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(list)->first = NULL; \
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(list)->last = NULL; \
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} while (0)
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struct io_wq_work {
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union {
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struct io_wq_work_node list;
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void *data;
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};
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void (*func)(struct io_wq_work **);
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struct files_struct *files;
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unsigned flags;
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};
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#define INIT_IO_WORK(work, _func) \
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do { \
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(work)->list.next = NULL; \
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(work)->func = _func; \
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(work)->flags = 0; \
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(work)->files = NULL; \
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} while (0) \
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typedef void (get_work_fn)(struct io_wq_work *);
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typedef void (put_work_fn)(struct io_wq_work *);
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struct io_wq_data {
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struct mm_struct *mm;
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struct user_struct *user;
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const struct cred *creds;
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get_work_fn *get_work;
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put_work_fn *put_work;
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};
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struct io_wq *io_wq_create(unsigned bounded, struct io_wq_data *data);
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void io_wq_destroy(struct io_wq *wq);
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void io_wq_enqueue(struct io_wq *wq, struct io_wq_work *work);
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void io_wq_enqueue_hashed(struct io_wq *wq, struct io_wq_work *work, void *val);
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void io_wq_flush(struct io_wq *wq);
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void io_wq_cancel_all(struct io_wq *wq);
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enum io_wq_cancel io_wq_cancel_work(struct io_wq *wq, struct io_wq_work *cwork);
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typedef bool (work_cancel_fn)(struct io_wq_work *, void *);
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enum io_wq_cancel io_wq_cancel_cb(struct io_wq *wq, work_cancel_fn *cancel,
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void *data);
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#if defined(CONFIG_IO_WQ)
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extern void io_wq_worker_sleeping(struct task_struct *);
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extern void io_wq_worker_running(struct task_struct *);
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#else
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static inline void io_wq_worker_sleeping(struct task_struct *tsk)
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{
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}
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static inline void io_wq_worker_running(struct task_struct *tsk)
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{
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}
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#endif /* CONFIG_IO_WQ */
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#endif /* INTERNAL_IO_WQ_H */
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