Btrfs: qgroup implementation and prototypes

Signed-off-by: Arne Jansen <sensille@gmx.net>
Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>

1 files changed, 34 insertions, 0 deletions

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index b13f1fbc3733..1a63b830846d 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -2409,6 +2409,40 @@ static u64 find_middle(struct rb_root *root)
 }
 #endif
 
+int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans,
+                                         struct btrfs_fs_info *fs_info)
+{
+        struct qgroup_update *qgroup_update;
+        int ret = 0;
+
+        if (list_empty(&trans->qgroup_ref_list) !=
+            !trans->delayed_ref_elem.seq) {
+                /* list without seq or seq without list */
+                printk(KERN_ERR "btrfs: qgroup accounting update error, list is%s empty, seq is %llu\n",
+                        list_empty(&trans->qgroup_ref_list) ? "" : " not",
+                        trans->delayed_ref_elem.seq);
+                BUG();
+        }
+
+        if (!trans->delayed_ref_elem.seq)
+                return 0;
+
+        while (!list_empty(&trans->qgroup_ref_list)) {
+                qgroup_update = list_first_entry(&trans->qgroup_ref_list,
+                                                 struct qgroup_update, list);
+                list_del(&qgroup_update->list);
+                if (!ret)
+                        ret = btrfs_qgroup_account_ref(
+                                        trans, fs_info, qgroup_update->node,
+                                        qgroup_update->extent_op);
+                kfree(qgroup_update);
+        }
+
+        btrfs_put_tree_mod_seq(fs_info, &trans->delayed_ref_elem);
+
+        return ret;
+}
+
 /*
  * this starts processing the delayed reference count updates and
  * extent insertions we have queued up so far.  count can be