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Jens Axboe5e605b62009-08-05 09:07:21 +02001#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
Jens Axboed62f8432009-08-11 08:31:14 +020021/*
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 */
Jens Axboe5e605b62009-08-05 09:07:21 +020026static inline int blk_iopoll_sched_prep(struct blk_iopoll *iop)
27{
Jens Axboed62f8432009-08-11 08:31:14 +020028 if (!test_bit(IOPOLL_F_DISABLE, &iop->state))
29 return test_and_set_bit(IOPOLL_F_SCHED, &iop->state);
30
31 return 1;
Jens Axboe5e605b62009-08-05 09:07:21 +020032}
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
Jens Axboe5e605b62009-08-05 09:07:21 +020046#endif