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1/* SPDX-License-Identifier: GPL-2.0-only */
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 sector_t end; /* highest interval end in subtree */
12 unsigned int size; /* size in bytes */
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 /* to resume a partially successful drbd_al_begin_io_nonblock(); */
19 unsigned int partially_in_al_next_enr;
20};
21
22static inline void drbd_clear_interval(struct drbd_interval *i)
23{
24 RB_CLEAR_NODE(&i->rb);
25}
26
27static inline bool drbd_interval_empty(struct drbd_interval *i)
28{
29 return RB_EMPTY_NODE(&i->rb);
30}
31
32extern bool drbd_insert_interval(struct rb_root *, struct drbd_interval *);
33extern bool drbd_contains_interval(struct rb_root *, sector_t,
34 struct drbd_interval *);
35extern void drbd_remove_interval(struct rb_root *, struct drbd_interval *);
36extern struct drbd_interval *drbd_find_overlap(struct rb_root *, sector_t,
37 unsigned int);
38extern struct drbd_interval *drbd_next_overlap(struct drbd_interval *, sector_t,
39 unsigned int);
40
41#define drbd_for_each_overlap(i, root, sector, size) \
42 for (i = drbd_find_overlap(root, sector, size); \
43 i; \
44 i = drbd_next_overlap(i, sector, size))
45
46#endif /* __DRBD_INTERVAL_H */