Sorry, that was too fast. Here is the right patch.
diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index ef59200..8926438 100644
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -1111,7 +1111,7 @@ static noinline_for_stack int scrub_chunk(struct scrub_dev *sdev,
struct map_lookup *map;
struct extent_map *em;
int i;
- int ret;
+ int ret = 0;
read_lock(&map_tree->map_tree.lock);
em = lookup_extent_mapping(&map_tree->map_tree, chunk_offset, 1);
@@ -1121,20 +1121,27 @@ static noinline_for_stack int scrub_chunk(struct scrub_dev *sdev,
return -EINVAL;
map = (struct map_lookup *)em->bdev;
- if (em->start != chunk_offset)
- return -EINVAL;
+ if (em->start != chunk_offset) {
+ ret = -EINVAL;
+ goto out;
+ }
- if (em->len < length)
- return -EINVAL;
+ if (em->len < length) {
+ ret = -EINVAL;
+ goto out;
+ }
for (i = 0; i < map->num_stripes; ++i) {
if (map->stripes[i].dev == sdev->dev) {
ret = scrub_stripe(sdev, map, i, chunk_offset, length);
if (ret)
- return ret;
+ goto out;
}
}
- return 0;
+
+out:
+ free_extent_map(em);
+ return ret;
}
static noinline_for_stack
--
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