Btrfs: check inconsistence between chunk and block group

[sagit-ice-cold/kernel_xiaomi_msm8998.git] / fs / btrfs / extent-tree.c

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index afbfa7c..2b7cba4 100644 (file)
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -9502,7 +9502,22 @@ static int find_first_block_group(struct btrfs_root *root,
 
                if (found_key.objectid >= key->objectid &&
                    found_key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) {
-                       ret = 0;
+                       struct extent_map_tree *em_tree;
+                       struct extent_map *em;
+
+                       em_tree = &root->fs_info->mapping_tree.map_tree;
+                       read_lock(&em_tree->lock);
+                       em = lookup_extent_mapping(em_tree, found_key.objectid,
+                                                  found_key.offset);
+                       read_unlock(&em_tree->lock);
+                       if (!em) {
+                               btrfs_err(root->fs_info,
+                       "logical %llu len %llu found bg but no related chunk",
+                                         found_key.objectid, found_key.offset);
+                               ret = -ENOENT;
+                       } else {
+                               ret = 0;
+                       }
                        goto out;
                }
                path->slots[0]++;