Btrfs: only do the tree_mod_log_free_eb if this is our last ref

commit 7fb7d76f96bfcbea25007d190ba828b18e13d29d upstream.

There is another bug in the tree mod log stuff in that we're calling
tree_mod_log_free_eb every single time a block is cow'ed.  The problem with this
is that if this block is shared by multiple snapshots we will call this multiple
times per block, so if we go to rewind the mod log for this block we'll BUG_ON()
in __tree_mod_log_rewind because we try to rewind a free twice.  We only want to
call tree_mod_log_free_eb if we are actually freeing the block.  With this patch
I no longer hit the panic in __tree_mod_log_rewind.  Thanks,

Reviewed-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index ca9d8f1a3bb67968dab36b8df98c0c2093a2300f..7a983f7e6b87b6db1503b08b32c45139e69dca30 100644 (file)
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -1049,7 +1049,8 @@ static noinline int __btrfs_cow_block(struct btrfs_trans_handle *trans,
                btrfs_set_node_ptr_generation(parent, parent_slot,
                                              trans->transid);
                btrfs_mark_buffer_dirty(parent);
-               tree_mod_log_free_eb(root->fs_info, buf);
+               if (last_ref)
+                       tree_mod_log_free_eb(root->fs_info, buf);
                btrfs_free_tree_block(trans, root, buf, parent_start,
                                      last_ref);
        }