43 lines
1.3 KiB
C
43 lines
1.3 KiB
C
#ifndef __DRBD_INTERVAL_H
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#define __DRBD_INTERVAL_H
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#include <linux/types.h>
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#include <linux/rbtree.h>
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struct drbd_interval {
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struct rb_node rb;
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sector_t sector; /* start sector of the interval */
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unsigned int size; /* size in bytes */
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sector_t end; /* highest interval end in subtree */
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unsigned int local:1 /* local or remote request? */;
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unsigned int waiting:1; /* someone is waiting for completion */
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unsigned int completed:1; /* this has been completed already;
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* ignore for conflict detection */
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};
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static inline void drbd_clear_interval(struct drbd_interval *i)
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{
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RB_CLEAR_NODE(&i->rb);
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}
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static inline bool drbd_interval_empty(struct drbd_interval *i)
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{
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return RB_EMPTY_NODE(&i->rb);
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}
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extern bool drbd_insert_interval(struct rb_root *, struct drbd_interval *);
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extern bool drbd_contains_interval(struct rb_root *, sector_t,
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struct drbd_interval *);
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extern void drbd_remove_interval(struct rb_root *, struct drbd_interval *);
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extern struct drbd_interval *drbd_find_overlap(struct rb_root *, sector_t,
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unsigned int);
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extern struct drbd_interval *drbd_next_overlap(struct drbd_interval *, sector_t,
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unsigned int);
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#define drbd_for_each_overlap(i, root, sector, size) \
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for (i = drbd_find_overlap(root, sector, size); \
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i; \
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i = drbd_next_overlap(i, sector, size))
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#endif /* __DRBD_INTERVAL_H */
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