[mirror_ubuntu-artful-kernel.git] / drivers / block / drbd / drbd_interval.h

#ifndef __DRBD_INTERVAL_H
#define __DRBD_INTERVAL_H

#include <linux/types.h>
#include <linux/rbtree.h>

struct drbd_interval {
	struct rb_node rb;
	sector_t sector;	/* start sector of the interval */
	unsigned int size;	/* size in bytes */
	sector_t end;		/* highest interval end in subtree */
	int local:1		/* local or remote request? */;
	int waiting:1;		/* someone is waiting for this to complete */
	int completed:1;	/* this has been completed already;
				 * ignore for conflict detection */
};

static inline void drbd_clear_interval(struct drbd_interval *i)
{
	RB_CLEAR_NODE(&i->rb);
}

static inline bool drbd_interval_empty(struct drbd_interval *i)
{
	return RB_EMPTY_NODE(&i->rb);
}

extern bool drbd_insert_interval(struct rb_root *, struct drbd_interval *);
extern bool drbd_contains_interval(struct rb_root *, sector_t,
				   struct drbd_interval *);
extern void drbd_remove_interval(struct rb_root *, struct drbd_interval *);
extern struct drbd_interval *drbd_find_overlap(struct rb_root *, sector_t,
					unsigned int);
extern struct drbd_interval *drbd_next_overlap(struct drbd_interval *, sector_t,
					unsigned int);

#define drbd_for_each_overlap(i, root, sector, size)		\
	for (i = drbd_find_overlap(root, sector, size);		\
	     i;							\
	     i = drbd_next_overlap(i, sector, size))

#endif  /* __DRBD_INTERVAL_H */
Commit	Line	Data
0939b0e5 AG	1	#ifndef __DRBD_INTERVAL_H
	2	#define __DRBD_INTERVAL_H
	3
	4	#include <linux/types.h>
	5	#include <linux/rbtree.h>
	6
	7	struct drbd_interval {
	8	struct rb_node rb;
	9	sector_t sector; /* start sector of the interval */
	10	unsigned int size; /* size in bytes */
	11	sector_t end; /* highest interval end in subtree */
5e472264	12	int local:1 /* local or remote request? */;
08d0dabf LE	13	int waiting:1; /* someone is waiting for this to complete */
	14	int completed:1; /* this has been completed already;
	15	* ignore for conflict detection */
0939b0e5 AG	16	};
	17
	18	static inline void drbd_clear_interval(struct drbd_interval *i)
	19	{
	20	RB_CLEAR_NODE(&i->rb);
	21	}
	22
	23	static inline bool drbd_interval_empty(struct drbd_interval *i)
	24	{
	25	return RB_EMPTY_NODE(&i->rb);
	26	}
	27
d0e22a26 AG	28	extern bool drbd_insert_interval(struct rb_root , struct drbd_interval );
	29	extern bool drbd_contains_interval(struct rb_root *, sector_t,
	30	struct drbd_interval *);
	31	extern void drbd_remove_interval(struct rb_root , struct drbd_interval );
	32	extern struct drbd_interval drbd_find_overlap(struct rb_root , sector_t,
0939b0e5	33	unsigned int);
d0e22a26 AG	34	extern struct drbd_interval drbd_next_overlap(struct drbd_interval , sector_t,
	35	unsigned int);
	36
	37	#define drbd_for_each_overlap(i, root, sector, size) \
	38	for (i = drbd_find_overlap(root, sector, size); \
	39	i; \
	40	i = drbd_next_overlap(i, sector, size))
0939b0e5 AG	41
0939b0e5 AG	42	#endif /* __DRBD_INTERVAL_H */