4.11-stable review patch. If anyone has any objections, please let me know. ------------------ From: Vinothkumar Raja <vinraja@xxxxxxxxxxxxxxxxx> commit 7d1fedb6e96a960aa91e4ff70714c3fb09195a5a upstream. dm_btree_find_lowest_key() is giving incorrect results. find_key() traverses the btree correctly for finding the highest key, but there is an error in the way it traverses the btree for retrieving the lowest key. dm_btree_find_lowest_key() fetches the first key of the rightmost block of the btree instead of fetching the first key from the leftmost block. Fix this by conditionally passing the correct parameter to value64() based on the @find_highest flag. Signed-off-by: Erez Zadok <ezk@xxxxxxxxxxxxxxxxx> Signed-off-by: Vinothkumar Raja <vinraja@xxxxxxxxxxxxxxxxx> Signed-off-by: Nidhi Panpalia <npanpalia@xxxxxxxxxxxxxxxxx> Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/md/persistent-data/dm-btree.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) --- a/drivers/md/persistent-data/dm-btree.c +++ b/drivers/md/persistent-data/dm-btree.c @@ -902,8 +902,12 @@ static int find_key(struct ro_spine *s, else *result_key = le64_to_cpu(ro_node(s)->keys[0]); - if (next_block || flags & INTERNAL_NODE) - block = value64(ro_node(s), i); + if (next_block || flags & INTERNAL_NODE) { + if (find_highest) + block = value64(ro_node(s), i); + else + block = value64(ro_node(s), 0); + } } while (flags & INTERNAL_NODE);