Commit 6a887571 authored by Vinothkumar Raja's avatar Vinothkumar Raja Committed by Sasha Levin

dm btree: fix for dm_btree_find_lowest_key()

[ Upstream commit 7d1fedb6 ]

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.

Cc: stable@vger.kernel.org
Signed-off-by: default avatarErez Zadok <ezk@fsl.cs.sunysb.edu>
Signed-off-by: default avatarVinothkumar Raja <vinraja@cs.stonybrook.edu>
Signed-off-by: default avatarNidhi Panpalia <npanpalia@cs.stonybrook.edu>
Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
Signed-off-by: default avatarSasha Levin <alexander.levin@verizon.com>
parent 2ad7696b
......@@ -788,8 +788,12 @@ static int find_key(struct ro_spine *s, dm_block_t block, bool find_highest,
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);
......
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