Commit d14c1f47 authored by Dennis Yang's avatar Dennis Yang Committed by Kamal Mostafa

dm btree remove: fix bug in redistribute3

commit 4c7e3093 upstream.

redistribute3() shares entries out across 3 nodes.  Some entries were
being moved the wrong way, breaking the ordering.  This manifested as a
BUG() in dm-btree-remove.c:shift() when entries were removed from the
btree.

For additional context see:
https://www.redhat.com/archives/dm-devel/2015-May/msg00113.htmlSigned-off-by: default avatarDennis Yang <shinrairis@gmail.com>
Signed-off-by: default avatarJoe Thornber <ejt@redhat.com>
Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
Signed-off-by: default avatarKamal Mostafa <kamal@canonical.com>
parent e064a006
......@@ -309,8 +309,8 @@ static void redistribute3(struct dm_btree_info *info, struct btree_node *parent,
if (s < 0 && nr_center < -s) {
/* not enough in central node */
shift(left, center, nr_center);
s = nr_center - target;
shift(left, center, -nr_center);
s += nr_center;
shift(left, right, s);
nr_right += s;
} else
......@@ -323,7 +323,7 @@ static void redistribute3(struct dm_btree_info *info, struct btree_node *parent,
if (s > 0 && nr_center < s) {
/* not enough in central node */
shift(center, right, nr_center);
s = target - nr_center;
s -= nr_center;
shift(left, right, s);
nr_left -= s;
} else
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment