[PATCH 055/118] drbd: Improve the drbd_find_overlap() documentation

[Philipp Reisner]

From: Andreas Gruenbacher <agruen@xxxxxxxxxx>

Describe how to reach any further overlapping intervals from the first
overlap found.

Signed-off-by: Philipp Reisner <philipp.reisner@xxxxxxxxxx>
Signed-off-by: Lars Ellenberg <lars.ellenberg@xxxxxxxxxx>
---
 drivers/block/drbd/drbd_interval.c |    8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/block/drbd/drbd_interval.c b/drivers/block/drbd/drbd_interval.c
index 0d17eaa..14dbe2d 100644
--- a/drivers/block/drbd/drbd_interval.c
+++ b/drivers/block/drbd/drbd_interval.c
@@ -122,9 +122,11 @@ drbd_remove_interval(struct rb_root *root, struct drbd_interval *this)
  * @sector:	start sector
  * @size:	size, aligned to 512 bytes
  *
- * Returns the interval overlapping with [sector, sector + size), or NULL.
- * When there is more than one overlapping interval in the tree, the interval
- * with the lowest start sector is returned.
+ * Returns an interval overlapping with [sector, sector + size), or NULL if
+ * there is none.  When there is more than one overlapping interval in the
+ * tree, the interval with the lowest start sector is returned, and all other
+ * overlapping intervals will be on the right side of the tree, reachable with
+ * rb_next().
  */
 struct drbd_interval *
 drbd_find_overlap(struct rb_root *root, sector_t sector, unsigned int size)
-- 
1.7.4.1

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