Linux Kernel  3.7.1
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blk-iopoll.h
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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;
14 };
15 
16 enum {
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  */
26 static 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 
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