LXR linux/drivers/block/drbd/drbd

   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
   8struct 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
  19static inline void drbd_clear_interval(struct drbd_interval *i)
  20{
  21        RB_CLEAR_NODE(&i->rb);
  22}
  23
  24static inline bool drbd_interval_empty(struct drbd_interval *i)
  25{
  26        return RB_EMPTY_NODE(&i->rb);
  27}
  28
  29extern bool drbd_insert_interval(struct rb_root *, struct drbd_interval *);
  30extern bool drbd_contains_interval(struct rb_root *, sector_t,
  31                                   struct drbd_interval *);
  32extern void drbd_remove_interval(struct rb_root *, struct drbd_interval *);
  33extern struct drbd_interval *drbd_find_overlap(struct rb_root *, sector_t,
  34                                        unsigned int);
  35extern 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 */
  44