Btrfs: dont do log_removal in insert_new_root

As for splitting a leaf, root is just the leaf, and tree mod log does not apply
on leaf, so in this case, we don't do log_removal.

As for splitting a node, the old root is kept as a normal node and we have nicely
put records in tree mod log for moving keys and items, so in this case we don't do
that either.

As above, insert_new_root can get rid of log_removal.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>

diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 17dffe3..0a430f7 100644 (file)
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -3143,7 +3143,7 @@ static int balance_node_right(struct btrfs_trans_handle *trans,
  */
 static noinline int insert_new_root(struct btrfs_trans_handle *trans,
                           struct btrfs_root *root,
-                          struct btrfs_path *path, int level, int log_removal)
+                          struct btrfs_path *path, int level)
 {
        u64 lower_gen;
        struct extent_buffer *lower;
@@ -3194,7 +3194,7 @@ static noinline int insert_new_root(struct btrfs_trans_handle *trans,
        btrfs_mark_buffer_dirty(c);
 
        old = root->node;
-       tree_mod_log_set_root_pointer(root, c, log_removal);
+       tree_mod_log_set_root_pointer(root, c, 0);
        rcu_assign_pointer(root->node, c);
 
        /* the super has an extra ref to root->node */
@@ -3278,14 +3278,14 @@ static noinline int split_node(struct btrfs_trans_handle *trans,
                /*
                 * trying to split the root, lets make a new one
                 *
-                * tree mod log: We pass 0 as log_removal parameter to
+                * tree mod log: We don't log_removal old root in
                 * insert_new_root, because that root buffer will be kept as a
                 * normal node. We are going to log removal of half of the
                 * elements below with tree_mod_log_eb_copy. We're holding a
                 * tree lock on the buffer, which is why we cannot race with
                 * other tree_mod_log users.
                 */
-               ret = insert_new_root(trans, root, path, level + 1, 0);
+               ret = insert_new_root(trans, root, path, level + 1);
                if (ret)
                        return ret;
        } else {
@@ -4005,7 +4005,7 @@ static noinline int split_leaf(struct btrfs_trans_handle *trans,
        }
 
        if (!path->nodes[1]) {
-               ret = insert_new_root(trans, root, path, 1, 1);
+               ret = insert_new_root(trans, root, path, 1);
                if (ret)
                        return ret;
        }