drivers/block/drbd/drbd_interval.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __DRBD_INTERVAL_H
   3 #define __DRBD_INTERVAL_H
   4
   5 #include <linux/types.h>
   6 #include <linux/rbtree.h>
   7
   8 struct drbd_interval {
   9         struct rb_node rb;
  10         sector_t sector;                /* start sector of the interval */
  11         unsigned int size;              /* size in bytes */
  12         sector_t end;                   /* highest interval end in subtree */
  13         unsigned int local:1            /* local or remote request? */;
  14         unsigned int waiting:1;         /* someone is waiting for completion */
  15         unsigned int completed:1;       /* this has been completed already;
  16                                          * ignore for conflict detection */
  17 };
  18
  19 static inline void drbd_clear_interval(struct drbd_interval *i)
  20 {
  21         RB_CLEAR_NODE(&i->rb);
  22 }
  23
  24 static inline bool drbd_interval_empty(struct drbd_interval *i)
  25 {
  26         return RB_EMPTY_NODE(&i->rb);
  27 }
  28
  29 extern bool drbd_insert_interval(struct rb_root *, struct drbd_interval *);
  30 extern bool drbd_contains_interval(struct rb_root *, sector_t,
  31                                    struct drbd_interval *);
  32 extern void drbd_remove_interval(struct rb_root *, struct drbd_interval *);
  33 extern struct drbd_interval *drbd_find_overlap(struct rb_root *, sector_t,
  34                                         unsigned int);
  35 extern struct drbd_interval *drbd_next_overlap(struct drbd_interval *, sector_t,
  36                                         unsigned int);
  37
  38 #define drbd_for_each_overlap(i, root, sector, size)            \
  39         for (i = drbd_find_overlap(root, sector, size);         \
  40              i;                                                 \
  41              i = drbd_next_overlap(i, sector, size))
  42
  43 #endif  /* __DRBD_INTERVAL_H */