aboutsummaryrefslogtreecommitdiff
path: root/drivers/block/drbd/drbd_interval.h
diff options
context:
space:
mode:
authorPhilipp Reisner <philipp.reisner@linbit.com>2012-11-09 14:18:43 +0100
committerPhilipp Reisner <philipp.reisner@linbit.com>2012-11-09 14:20:23 +0100
commit986836503e49ccf7e84b813715d344964ec93566 (patch)
treeb3bea7428efde5b77096cef80e5b6bfee494cc12 /drivers/block/drbd/drbd_interval.h
parentccae7868b0c5697508a541c531cf96b361d62c1c (diff)
parent328e0f125bf41f4f33f684db22015f92cb44fe56 (diff)
downloadvexpress-lsk-986836503e49ccf7e84b813715d344964ec93566.tar.gz
Merge branch 'drbd-8.4_ed6' into for-3.8-drivers-drbd-8.4_ed6
Diffstat (limited to 'drivers/block/drbd/drbd_interval.h')
-rw-r--r--drivers/block/drbd/drbd_interval.h40
1 files changed, 40 insertions, 0 deletions
diff --git a/drivers/block/drbd/drbd_interval.h b/drivers/block/drbd/drbd_interval.h
new file mode 100644
index 00000000000..f38fcb00c10
--- /dev/null
+++ b/drivers/block/drbd/drbd_interval.h
@@ -0,0 +1,40 @@
+#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;
+};
+
+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 */