1#ifndef BLK_IOPOLL_H
2#define BLK_IOPOLL_H
3
4struct blk_iopoll;
5typedef int (blk_iopoll_fn)(struct blk_iopoll *, int);
6
7struct blk_iopoll {
8	struct list_head list;
9	unsigned long state;
10	unsigned long data;
11	int weight;
12	int max;
13	blk_iopoll_fn *poll;
14};
15
16enum {
17	IOPOLL_F_SCHED		= 0,
18	IOPOLL_F_DISABLE	= 1,
19};
20
21/*
22 * Returns 0 if we successfully set the IOPOLL_F_SCHED bit, indicating
23 * that we were the first to acquire this iop for scheduling. If this iop
24 * is currently disabled, return "failure".
25 */
26static inline int blk_iopoll_sched_prep(struct blk_iopoll *iop)
27{
28	if (!test_bit(IOPOLL_F_DISABLE, &iop->state))
29		return test_and_set_bit(IOPOLL_F_SCHED, &iop->state);
30
31	return 1;
32}
33
34static inline int blk_iopoll_disable_pending(struct blk_iopoll *iop)
35{
36	return test_bit(IOPOLL_F_DISABLE, &iop->state);
37}
38
39extern void blk_iopoll_sched(struct blk_iopoll *);
40extern void blk_iopoll_init(struct blk_iopoll *, int, blk_iopoll_fn *);
41extern void blk_iopoll_complete(struct blk_iopoll *);
42extern void __blk_iopoll_complete(struct blk_iopoll *);
43extern void blk_iopoll_enable(struct blk_iopoll *);
44extern void blk_iopoll_disable(struct blk_iopoll *);
45
46#endif
47