| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.1 116/267] dm btree remove: fix bug in redistribute3 | Date | Fri, 31 Jul 2015 12:39:27 -0700 |
| |
4.1-stable review patch. If anyone has any objections, please let me know.
------------------
From: Dennis Yang <shinrairis@gmail.com>
commit 4c7e309340ff85072e96f529582d159002c36734 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.html
Signed-off-by: Dennis Yang <shinrairis@gmail.com> Signed-off-by: Joe Thornber <ejt@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/md/persistent-data/dm-btree-remove.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
--- a/drivers/md/persistent-data/dm-btree-remove.c +++ b/drivers/md/persistent-data/dm-btree-remove.c @@ -309,8 +309,8 @@ static void redistribute3(struct dm_btre 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_btre 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
|