From e7e0f730477dea190fbc18c2d93338dacee82cea Mon Sep 17 00:00:00 2001 From: Joe Thornber Date: Fri, 1 Jul 2016 11:09:13 +0100 Subject: [PATCH] dm btree: fix a bug in dm_btree_find_next_single() dm_btree_find_next_single() can short-circuit the search for a block with a return of -ENODATA if all entries are higher than the search key passed to lower_bound(). This hasn't been a problem because of the way the btree has been used by DM thinp. But it must be fixed now in preparation for fixing the race in DM thinp's handling of simultaneous block discard vs allocation. Otherwise, once that fix is in place, some of the blocks in a discard would not be unmapped as expected. Signed-off-by: Joe Thornber Signed-off-by: Mike Snitzer --- drivers/md/persistent-data/dm-btree.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/md/persistent-data/dm-btree.c b/drivers/md/persistent-data/dm-btree.c index ea3d3b656fd0..2cc1877804c2 100644 --- a/drivers/md/persistent-data/dm-btree.c +++ b/drivers/md/persistent-data/dm-btree.c @@ -429,7 +429,14 @@ static int dm_btree_lookup_next_single(struct dm_btree_info *info, dm_block_t ro if (flags & INTERNAL_NODE) { i = lower_bound(n, key); - if (i < 0 || i >= nr_entries) { + if (i < 0) { + /* + * avoid early -ENODATA return when all entries are + * higher than the search @key. + */ + i = 0; + } + if (i >= nr_entries) { r = -ENODATA; goto out; } -- 2.39.5