xfs: introduce realtime refcount btree definitions

Add new realtime refcount btree definitions. The realtime refcount btree
will be rooted from a hidden inode, but has its own shape and therefore
needs to have most of its own separate types.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>

diff --git a/libxfs/xfs_format.h b/libxfs/xfs_format.h
index 9eaf7234705c82109e6390697ec337466f87218a..be6acf033058a4f612bb8f1a3e826c527c42c4f8 100644 (file)
--- a/libxfs/xfs_format.h
+++ b/libxfs/xfs_format.h
@@ -1768,6 +1768,12 @@ struct xfs_refcount_key {
 /* btree pointer type */
 typedef __be32 xfs_refcount_ptr_t;
 
+/*
+ * Realtime Reference Count btree format definitions
+ *
+ * This is a btree for reference count records for realtime volumes
+ */
+#define        XFS_RTREFC_CRC_MAGIC    0x52434e54      /* 'RCNT' */
 
 /*
  * BMAP Btree format definitions