LXR linux/drivers/block/drbd/drbd

   1#ifndef __DRBD_INTERVAL_H
   2#define __DRBD_INTERVAL_H
   3
   4#include <linux/types.h>
   5#include <linux/rbtree.h>
   6
   7struct 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 */
  12        unsigned int local:1            /* local or remote request? */;
  13        unsigned int waiting:1;         /* someone is waiting for completion */
  14        unsigned int completed:1;       /* this has been completed already;
  15                                         * ignore for conflict detection */
  16};
  17
  18static inline void drbd_clear_interval(struct drbd_interval *i)
  19{
  20        RB_CLEAR_NODE(&i->rb);
  21}
  22
  23static inline bool drbd_interval_empty(struct drbd_interval *i)
  24{
  25        return RB_EMPTY_NODE(&i->rb);
  26}
  27
  28extern bool drbd_insert_interval(struct rb_root *, struct drbd_interval *);
  29extern bool drbd_contains_interval(struct rb_root *, sector_t,
  30                                   struct drbd_interval *);
  31extern void drbd_remove_interval(struct rb_root *, struct drbd_interval *);
  32extern struct drbd_interval *drbd_find_overlap(struct rb_root *, sector_t,
  33                                        unsigned int);
  34extern 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))
  41
  42#endif  /* __DRBD_INTERVAL_H */
  43