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