49 lines
1.2 KiB
C
49 lines
1.2 KiB
C
#ifndef BLK_IOPOLL_H
|
|
#define BLK_IOPOLL_H
|
|
|
|
struct blk_iopoll;
|
|
typedef int (blk_iopoll_fn)(struct blk_iopoll *, int);
|
|
|
|
struct blk_iopoll {
|
|
struct list_head list;
|
|
unsigned long state;
|
|
unsigned long data;
|
|
int weight;
|
|
int max;
|
|
blk_iopoll_fn *poll;
|
|
};
|
|
|
|
enum {
|
|
IOPOLL_F_SCHED = 0,
|
|
IOPOLL_F_DISABLE = 1,
|
|
};
|
|
|
|
/*
|
|
* Returns 0 if we successfully set the IOPOLL_F_SCHED bit, indicating
|
|
* that we were the first to acquire this iop for scheduling. If this iop
|
|
* is currently disabled, return "failure".
|
|
*/
|
|
static inline int blk_iopoll_sched_prep(struct blk_iopoll *iop)
|
|
{
|
|
if (!test_bit(IOPOLL_F_DISABLE, &iop->state))
|
|
return test_and_set_bit(IOPOLL_F_SCHED, &iop->state);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static inline int blk_iopoll_disable_pending(struct blk_iopoll *iop)
|
|
{
|
|
return test_bit(IOPOLL_F_DISABLE, &iop->state);
|
|
}
|
|
|
|
extern void blk_iopoll_sched(struct blk_iopoll *);
|
|
extern void blk_iopoll_init(struct blk_iopoll *, int, blk_iopoll_fn *);
|
|
extern void blk_iopoll_complete(struct blk_iopoll *);
|
|
extern void __blk_iopoll_complete(struct blk_iopoll *);
|
|
extern void blk_iopoll_enable(struct blk_iopoll *);
|
|
extern void blk_iopoll_disable(struct blk_iopoll *);
|
|
|
|
extern int blk_iopoll_enabled;
|
|
|
|
#endif
|