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| author | Dennis Yang <shinrairis@gmail.com> | 2015-06-26 16:25:48 +0200 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2015-07-05 23:43:58 +0200 |
| commit | 4c7e309340ff85072e96f529582d159002c36734 (patch) | |
| tree | 1884c3e38170df1f74a37a6a0a075562f7bd88a3 /drivers | |
| parent | Linux 4.2-rc1 (diff) | |
| download | linux-4c7e309340ff85072e96f529582d159002c36734.tar.xz linux-4c7e309340ff85072e96f529582d159002c36734.zip | |
dm btree remove: fix bug in redistribute3
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>
Cc: stable@vger.kernel.org
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/md/persistent-data/dm-btree-remove.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/md/persistent-data/dm-btree-remove.c b/drivers/md/persistent-data/dm-btree-remove.c index e04cfd2d60ef..9836c0ae897c 100644 --- 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_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 |