Btrfs: don't print the leaf if we had an error

In __btrfs_free_extent we will print the leaf if we fail to find the extent we
wanted, but the problem is if we get an error we won't have a leaf so often this
leads to a NULL pointer dereference and we lose the error that actually
occurred.  So only print the leaf if ret > 0, which means we didn't find the
item we were looking for but we didn't error either.  This way the error is
preserved.

Signed-off-by: Josef Bacik <josef@redhat.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index b172b7f..66bac22 100644 (file)
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -4462,7 +4462,9 @@ static int __btrfs_free_extent(struct btrfs_trans_handle *trans,
                                printk(KERN_ERR "umm, got %d back from search"
                                       ", was looking for %llu\n", ret,
                                       (unsigned long long)bytenr);
-                               btrfs_print_leaf(extent_root, path->nodes[0]);
+                               if (ret > 0)
+                                       btrfs_print_leaf(extent_root,
+                                                        path->nodes[0]);
                        }
                        BUG_ON(ret);
                        extent_slot = path->slots[0];