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drbd: Improve the drbd_find_overlap() documentation 

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

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
hifive-unleashed-5.1
Andreas Gruenbacher 2011-02-04 12:11:05 +01:00 committed by Philipp Reisner
parent 43ae077d0a
commit 70b1987663
1 changed files with 5 additions and 3 deletions
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8
drivers/block/drbd/drbd_interval.c
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@ -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)