3 files changed, 21 insertions, 5 deletions

diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 14a72ed14ef7..97a98fc07cfc 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -213,11 +213,19 @@ static struct extent_buffer *btrfs_read_lock_root_node(struct btrfs_root *root)
  */
 static void add_root_to_dirty_list(struct btrfs_root *root)
 {
+        if (test_bit(BTRFS_ROOT_DIRTY, &root->state) ||
+            !test_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state))
+                return;
+
         spin_lock(&root->fs_info->trans_lock);
-        if (test_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state) &&
-            list_empty(&root->dirty_list)) {
-                list_add(&root->dirty_list,
-                         &root->fs_info->dirty_cowonly_roots);
+        if (!test_and_set_bit(BTRFS_ROOT_DIRTY, &root->state)) {
+                /* Want the extent tree to be the last on the list */
+                if (root->objectid == BTRFS_EXTENT_TREE_OBJECTID)
+                        list_move_tail(&root->dirty_list,
+                                       &root->fs_info->dirty_cowonly_roots);
+                else
+                        list_move(&root->dirty_list,
+                                  &root->fs_info->dirty_cowonly_roots);
         }
         spin_unlock(&root->fs_info->trans_lock);
 }
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 7e607416755a..45ed4dc6a0ce 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1775,6 +1775,7 @@ struct btrfs_subvolume_writers {
 #define BTRFS_ROOT_DEFRAG_RUNNING       6
 #define BTRFS_ROOT_FORCE_COW            7
 #define BTRFS_ROOT_MULTI_LOG_TASKS      8
+#define BTRFS_ROOT_DIRTY                9
 
 /*
  * in ram representation of the tree.  extent_root is used for all allocations
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index a605d4e2f2bc..aa2219ebecc9 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -1020,6 +1020,7 @@ static int update_cowonly_root(struct btrfs_trans_handle *trans,
         u64 old_root_bytenr;
         u64 old_root_used;
         struct btrfs_root *tree_root = root->fs_info->tree_root;
+        bool extent_root = (root->objectid == BTRFS_EXTENT_TREE_OBJECTID);
 
         old_root_used = btrfs_root_used(&root->root_item);
         btrfs_write_dirty_block_groups(trans, root);
@@ -1038,7 +1039,12 @@ static int update_cowonly_root(struct btrfs_trans_handle *trans,
                         return ret;
 
                 old_root_used = btrfs_root_used(&root->root_item);
-                ret = btrfs_write_dirty_block_groups(trans, root);
+                if (extent_root) {
+                        ret = btrfs_write_dirty_block_groups(trans, root);
+                        if (ret)
+                                return ret;
+                }
+                ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1);
                 if (ret)
                         return ret;
         }
@@ -1097,6 +1103,7 @@ static noinline int commit_cowonly_roots(struct btrfs_trans_handle *trans,
                 next = fs_info->dirty_cowonly_roots.next;
                 list_del_init(next);
                 root = list_entry(next, struct btrfs_root, dirty_list);
+                clear_bit(BTRFS_ROOT_DIRTY, &root->state);
 
                 if (root != fs_info->extent_root)
                         list_add_tail(&root->dirty_list,