diff options
Diffstat (limited to 'drivers/block/drbd/drbd_interval.h')
| -rw-r--r-- | drivers/block/drbd/drbd_interval.h | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/drivers/block/drbd/drbd_interval.h b/drivers/block/drbd/drbd_interval.h new file mode 100644 index 000000000..f210543f0 --- /dev/null +++ b/drivers/block/drbd/drbd_interval.h @@ -0,0 +1,42 @@ +#ifndef __DRBD_INTERVAL_H +#define __DRBD_INTERVAL_H + +#include <linux/types.h> +#include <linux/rbtree.h> + +struct drbd_interval { + struct rb_node rb; + sector_t sector; /* start sector of the interval */ + unsigned int size; /* size in bytes */ + sector_t end; /* highest interval end in subtree */ + int local:1 /* local or remote request? */; + int waiting:1; /* someone is waiting for this to complete */ + int completed:1; /* this has been completed already; + * ignore for conflict detection */ +}; + +static inline void drbd_clear_interval(struct drbd_interval *i) +{ + RB_CLEAR_NODE(&i->rb); +} + +static inline bool drbd_interval_empty(struct drbd_interval *i) +{ + return RB_EMPTY_NODE(&i->rb); +} + +extern bool drbd_insert_interval(struct rb_root *, struct drbd_interval *); +extern bool drbd_contains_interval(struct rb_root *, sector_t, + struct drbd_interval *); +extern void drbd_remove_interval(struct rb_root *, struct drbd_interval *); +extern struct drbd_interval *drbd_find_overlap(struct rb_root *, sector_t, + unsigned int); +extern struct drbd_interval *drbd_next_overlap(struct drbd_interval *, sector_t, + unsigned int); + +#define drbd_for_each_overlap(i, root, sector, size) \ + for (i = drbd_find_overlap(root, sector, size); \ + i; \ + i = drbd_next_overlap(i, sector, size)) + +#endif /* __DRBD_INTERVAL_H */ |