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         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
  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
  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,
  33                                         unsigned int);
  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))
  41
  42 #endif  /* __DRBD_INTERVAL_H */