| Jens Axboe | 5e605b6 | 2009-08-05 09:07:21 +0200 | [diff] [blame] | 1 | #ifndef BLK_IOPOLL_H |
| 2 | #define BLK_IOPOLL_H |
| 3 | |
| 4 | struct blk_iopoll; |
| 5 | typedef int (blk_iopoll_fn)(struct blk_iopoll *, int); |
| 6 | |
| 7 | struct 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 | |
| 16 | enum { |
| 17 | IOPOLL_F_SCHED = 0, |
| 18 | IOPOLL_F_DISABLE = 1, |
| 19 | }; |
| 20 | |
| Jens Axboe | d62f843 | 2009-08-11 08:31:14 +0200 | [diff] [blame] | 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 | */ |
| Jens Axboe | 5e605b6 | 2009-08-05 09:07:21 +0200 | [diff] [blame] | 26 | static inline int blk_iopoll_sched_prep(struct blk_iopoll *iop) |
| 27 | { |
| Jens Axboe | d62f843 | 2009-08-11 08:31:14 +0200 | [diff] [blame] | 28 | if (!test_bit(IOPOLL_F_DISABLE, &iop->state)) |
| 29 | return test_and_set_bit(IOPOLL_F_SCHED, &iop->state); |
| 30 | |
| 31 | return 1; |
| Jens Axboe | 5e605b6 | 2009-08-05 09:07:21 +0200 | [diff] [blame] | 32 | } |
| 33 | |
| 34 | static inline int blk_iopoll_disable_pending(struct blk_iopoll *iop) |
| 35 | { |
| 36 | return test_bit(IOPOLL_F_DISABLE, &iop->state); |
| 37 | } |
| 38 | |
| 39 | extern void blk_iopoll_sched(struct blk_iopoll *); |
| 40 | extern void blk_iopoll_init(struct blk_iopoll *, int, blk_iopoll_fn *); |
| 41 | extern void blk_iopoll_complete(struct blk_iopoll *); |
| 42 | extern void __blk_iopoll_complete(struct blk_iopoll *); |
| 43 | extern void blk_iopoll_enable(struct blk_iopoll *); |
| 44 | extern void blk_iopoll_disable(struct blk_iopoll *); |
| 45 | |
| 46 | extern int blk_iopoll_enabled; |
| 47 | |
| 48 | #endif |