LU-1303 lod: directories to inherit default striping

[fs/lustre-release.git] / lustre / include / lustre / lustre_idl.h

diff --git a/lustre/include/lustre/lustre_idl.h b/lustre/include/lustre/lustre_idl.h
index f4c6784..5426309 100644 (file)
--- a/lustre/include/lustre/lustre_idl.h
+++ b/lustre/include/lustre/lustre_idl.h
@@ -1383,6 +1383,21 @@ enum obdo_flags {
 #define LOV_MAGIC_JOIN_V1 0x0BD20BD0
 #define LOV_MAGIC_V3      0x0BD30BD0
 
+/*
+ * magic for fully defined striping
+ * the idea is that we should have different magics for striping "hints"
+ * (struct lov_user_md_v[13]) and defined ready-to-use striping (struct
+ * lov_mds_md_v[13]). at the moment the magics are used in wire protocol,
+ * we can't just change it w/o long way preparation, but we still need a
+ * mechanism to allow LOD to differentiate hint versus ready striping.
+ * so, at the moment we do a trick: MDT knows what to expect from request
+ * depending on the case (replay uses ready striping, non-replay req uses
+ * hints), so MDT replaces magic with appropriate one and now LOD can
+ * easily understand what's inside -bzzz
+ */
+#define LOV_MAGIC_V1_DEF  0x0CD10BD0
+#define LOV_MAGIC_V3_DEF  0x0CD30BD0
+
 #define LOV_PATTERN_RAID0 0x001   /* stripes are used round-robin */
 #define LOV_PATTERN_RAID1 0x002   /* stripes are mirrors of each other */
 #define LOV_PATTERN_FIRST 0x100   /* first stripe is not in round-robin */