Btrfs: hold trans_mutex when using btrfs_record_root_in_trans

[safe/jmp/linux-2.6] / fs / btrfs / transaction.c

diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 919172d..4112d53 100644 (file)
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -688,7 +688,9 @@ static noinline int drop_dirty_roots(struct btrfs_root *tree_root,
                num_bytes -= btrfs_root_used(&dirty->root->root_item);
                bytes_used = btrfs_root_used(&root->root_item);
                if (num_bytes) {
+                       mutex_lock(&root->fs_info->trans_mutex);
                        btrfs_record_root_in_trans(root);
+                       mutex_unlock(&root->fs_info->trans_mutex);
                        btrfs_set_root_used(&root->root_item,
                                            bytes_used - num_bytes);
                }