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8e29da69fe
The current cancelation will lookup and cancel the first request it finds based on the key passed in. Add a flag that allows to cancel any request that matches they key. It completes with the number of requests found and canceled, or res < 0 if an error occured. Signed-off-by: Jens Axboe <axboe@kernel.dk> Link: https://lore.kernel.org/r/20220418164402.75259-4-axboe@kernel.dk
229 lines
5.1 KiB
C
229 lines
5.1 KiB
C
#ifndef INTERNAL_IO_WQ_H
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#define INTERNAL_IO_WQ_H
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#include <linux/refcount.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_HASHED = 2,
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IO_WQ_WORK_UNBOUND = 4,
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IO_WQ_WORK_CONCURRENT = 16,
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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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#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_for_each_resume(pos, prv) \
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for (; 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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} while (0)
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static inline void wq_list_add_after(struct io_wq_work_node *node,
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struct io_wq_work_node *pos,
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struct io_wq_work_list *list)
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{
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struct io_wq_work_node *next = pos->next;
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pos->next = node;
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node->next = next;
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if (!next)
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list->last = node;
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}
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/**
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* wq_list_merge - merge the second list to the first one.
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* @list0: the first list
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* @list1: the second list
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* Return the first node after mergence.
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*/
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static inline struct io_wq_work_node *wq_list_merge(struct io_wq_work_list *list0,
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struct io_wq_work_list *list1)
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{
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struct io_wq_work_node *ret;
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if (!list0->first) {
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ret = list1->first;
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} else {
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ret = list0->first;
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list0->last->next = list1->first;
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}
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INIT_WQ_LIST(list0);
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INIT_WQ_LIST(list1);
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return ret;
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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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node->next = NULL;
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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_list_add_head(struct io_wq_work_node *node,
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struct io_wq_work_list *list)
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{
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node->next = list->first;
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if (!node->next)
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list->last = node;
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WRITE_ONCE(list->first, node);
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}
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static inline void wq_list_cut(struct io_wq_work_list *list,
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struct io_wq_work_node *last,
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struct io_wq_work_node *prev)
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{
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/* first in the list, if prev==NULL */
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if (!prev)
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WRITE_ONCE(list->first, last->next);
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else
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prev->next = last->next;
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if (last == list->last)
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list->last = prev;
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last->next = NULL;
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}
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static inline void __wq_list_splice(struct io_wq_work_list *list,
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struct io_wq_work_node *to)
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{
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list->last->next = to->next;
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to->next = list->first;
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INIT_WQ_LIST(list);
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}
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static inline bool wq_list_splice(struct io_wq_work_list *list,
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struct io_wq_work_node *to)
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{
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if (!wq_list_empty(list)) {
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__wq_list_splice(list, to);
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return true;
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}
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return false;
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}
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static inline void wq_stack_add_head(struct io_wq_work_node *node,
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struct io_wq_work_node *stack)
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{
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node->next = stack->next;
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stack->next = node;
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}
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static inline void wq_list_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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wq_list_cut(list, node, prev);
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}
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static inline
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struct io_wq_work_node *wq_stack_extract(struct io_wq_work_node *stack)
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{
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struct io_wq_work_node *node = stack->next;
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stack->next = node->next;
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return node;
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}
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struct io_wq_work {
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struct io_wq_work_node list;
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unsigned flags;
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int cancel_seq;
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};
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static inline struct io_wq_work *wq_next_work(struct io_wq_work *work)
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{
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if (!work->list.next)
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return NULL;
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return container_of(work->list.next, struct io_wq_work, list);
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}
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typedef struct io_wq_work *(free_work_fn)(struct io_wq_work *);
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typedef void (io_wq_work_fn)(struct io_wq_work *);
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struct io_wq_hash {
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refcount_t refs;
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unsigned long map;
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struct wait_queue_head wait;
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};
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static inline void io_wq_put_hash(struct io_wq_hash *hash)
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{
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if (refcount_dec_and_test(&hash->refs))
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kfree(hash);
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}
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struct io_wq_data {
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struct io_wq_hash *hash;
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struct task_struct *task;
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io_wq_work_fn *do_work;
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free_work_fn *free_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_exit_start(struct io_wq *wq);
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void io_wq_put_and_exit(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_hash_work(struct io_wq_work *work, void *val);
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int io_wq_cpu_affinity(struct io_wq *wq, cpumask_var_t mask);
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int io_wq_max_workers(struct io_wq *wq, int *new_count);
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static inline bool io_wq_is_hashed(struct io_wq_work *work)
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{
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return work->flags & IO_WQ_WORK_HASHED;
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}
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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, bool cancel_all);
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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
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static inline bool io_wq_current_is_worker(void)
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{
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return in_task() && (current->flags & PF_IO_WORKER) &&
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current->worker_private;
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}
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#endif
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