linux/include/linux/blk-iopoll.h
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   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
  46extern int blk_iopoll_enabled;
  47
  48#endif
  49
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