Eric Lee / smarc-fsl-linux-kernel

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include/linux/blk-iopoll.h 1.16 KB
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5e605b64a   Jens Axboe   block: add blk-io... 
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  #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,
  };
d62f843b2   Jens Axboe   block: make blk_i... 
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  /*
   * 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".
   */
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  static inline int blk_iopoll_sched_prep(struct blk_iopoll *iop)
  {
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  	if (!test_bit(IOPOLL_F_DISABLE, &iop->state))
  		return test_and_set_bit(IOPOLL_F_SCHED, &iop->state);
  
  	return 1;
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  }
  
  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