Btrfs: hooks for qgroup to record delayed refs

Hooks into qgroup code to record refs and into transaction commit.
This is the main entry point for qgroup. Basically every change in
extent backrefs got accounted to the appropriate qgroups.

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

1 files changed, 19 insertions, 0 deletions

diff --git a/fs/btrfs/delayed-ref.h b/fs/btrfs/delayed-ref.h
index 2b5cb27f9861..0d7c90c366b6 100644
--- a/fs/btrfs/delayed-ref.h
+++ b/fs/btrfs/delayed-ref.h
@@ -180,6 +180,25 @@ int btrfs_check_delayed_seq(struct btrfs_fs_info *fs_info,
                             u64 seq);
 
 /*
+ * delayed refs with a ref_seq > 0 must be held back during backref walking.
+ * this only applies to items in one of the fs-trees. for_cow items never need
+ * to be held back, so they won't get a ref_seq number.
+ */
+static inline int need_ref_seq(int for_cow, u64 rootid)
+{
+        if (for_cow)
+                return 0;
+
+        if (rootid == BTRFS_FS_TREE_OBJECTID)
+                return 1;
+
+        if ((s64)rootid >= (s64)BTRFS_FIRST_FREE_OBJECTID)
+                return 1;
+
+        return 0;
+}
+
+/*
  * a node might live in a head or a regular ref, this lets you
  * test for the proper type to use.
  */