btrfs-progs: print-tree: Do correct offset output for ROOT_ITEM

Commit Fixes: 8c36786c8198 ("btrfs-progs: print-tree: Print offset as
tree objectid for ROOT_ITEM") changes how we translate offset of
ROOT_ITEM.

However the fact is, even for ROOT_ITEM, we have different meaning of
offset.

For tree reloc tree, it's indeed subvolume id.  But for other trees,
it's the transid of when it's created.

Reported-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/print-tree.c b/print-tree.c
index 45350fe..2dbed72 100644 (file)
--- a/print-tree.c
+++ b/print-tree.c
@@ -834,7 +834,16 @@ void btrfs_print_key(struct btrfs_disk_key *disk_key)
         */
        case BTRFS_ROOT_ITEM_KEY:
                printf(" ");
-               print_objectid(stdout, offset, type);
+               /*
+                * Normally offset of ROOT_ITEM should present the generation
+                * of creation time of the root.
+                * However if this is reloc tree, offset is the subvolume
+                * id of its source. Here we do extra check on this.
+                */
+               if (objectid == BTRFS_TREE_RELOC_OBJECTID)
+                       print_objectid(stdout, offset, type);
+               else
+                       printf("%lld", offset);
                printf(")");
                break;
        default: