drivers/block/drbd/drbd_interval.h

   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 */
  12         int local:1             /* local or remote request? */;
  13         int waiting:1;
  14 };
  15
  16 static inline void drbd_clear_interval(struct drbd_interval *i)
  17 {
  18         RB_CLEAR_NODE(&i->rb);
  19 }
  20
  21 static inline bool drbd_interval_empty(struct drbd_interval *i)
  22 {
  23         return RB_EMPTY_NODE(&i->rb);
  24 }
  25
  26 extern bool drbd_insert_interval(struct rb_root *, struct drbd_interval *);
  27 extern bool drbd_contains_interval(struct rb_root *, sector_t,
  28                                    struct drbd_interval *);
  29 extern void drbd_remove_interval(struct rb_root *, struct drbd_interval *);
  30 extern struct drbd_interval *drbd_find_overlap(struct rb_root *, sector_t,
  31                                         unsigned int);
  32 extern 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 */