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        int local:1             /* local or remote request? */;
  13        int waiting:1;
  14};
  15
  16static inline void drbd_clear_interval(struct drbd_interval *i)
  17{
  18        RB_CLEAR_NODE(&i->rb);
  19}
  20
  21static inline bool drbd_interval_empty(struct drbd_interval *i)
  22{
  23        return RB_EMPTY_NODE(&i->rb);
  24}
  25
  26extern bool drbd_insert_interval(struct rb_root *, struct drbd_interval *);
  27extern bool drbd_contains_interval(struct rb_root *, sector_t,
  28                                   struct drbd_interval *);
  29extern void drbd_remove_interval(struct rb_root *, struct drbd_interval *);
  30extern struct drbd_interval *drbd_find_overlap(struct rb_root *, sector_t,
  31                                        unsigned int);
  32extern struct drbd_interval *drbd_next_overlap(struct drbd_interval *, sector_t,
  33                                        unsigned int);
  34
  35#define drbd_for_each_overlap(i, root, sector, size)            \
  36        for (i = drbd_find_overlap(root, sector, size);         \
  37             i;                                                 \
  38             i = drbd_next_overlap(i, sector, size))
  39
  40#endif  /* __DRBD_INTERVAL_H */
  41