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dm btree: fix for dm_btree_find_lowest_key()

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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: Erez Zadok <ezk@fsl.cs.sunysb.edu>
Signed-off-by: Vinothkumar Raja <vinraja@cs.stonybrook.edu>
Signed-off-by: Nidhi Panpalia <npanpalia@cs.stonybrook.edu>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Vinothkumar Raja 2017-04-06 22:09:38 -04:00 committed by Mike Snitzer
parent e36215d87f
commit 7d1fedb6e9
1 changed files with 6 additions and 2 deletions
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8
drivers/md/persistent-data/dm-btree.c
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@ -902,8 +902,12 @@ 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);