Btrfs: remove BUG_ON in __add_tree_block

The BUG_ON() can be triggered when the caller is processing an invalid
extent inline ref, e.g.

a shared data ref is offered instead of an extent data ref, such that
it tries to find a non-existent tree block and then btrfs_search_slot
returns 1 for no such item.

This replaces the BUG_ON() with a WARN() followed by calling
btrfs_print_leaf() to show more details about what's going on and
returning -EINVAL to upper callers.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
index 1c086d0..3a49a3c 100644 (file)
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c
@@ -32,6 +32,7 @@
 #include "free-space-cache.h"
 #include "inode-map.h"
 #include "qgroup.h"
+#include "print-tree.h"
 
 /*
  * backref_node, mapping_node and tree_block start with this
@@ -3483,7 +3484,16 @@ again:
                        goto again;
                }
        }
-       BUG_ON(ret);
+       if (ret) {
+               ASSERT(ret == 1);
+               btrfs_print_leaf(path->nodes[0]);
+               btrfs_err(fs_info,
+            "tree block extent item (%llu) is not found in extent tree",
+                    bytenr);
+               WARN_ON(1);
+               ret = -EINVAL;
+               goto out;
+       }
 
        ret = add_tree_block(rc, &key, path, blocks);
 out: