refs #5902 Add layout version change

git-svn-id: file:///svn/toku/tokudb@52164 c7de825b-a66e-492c-adef-691d508d4ae1

ft/ft-serialize.cc

@@ -369,6 +369,7 @@ serialize_ft_min_size (uint32_t version) {
     size_t size = 0;
 
     switch(version) {
+    case FT_LAYOUT_VERSION_24:
     case FT_LAYOUT_VERSION_23:
     case FT_LAYOUT_VERSION_22:
     case FT_LAYOUT_VERSION_21:

ft/ft_layout_version.h

@@ -31,7 +31,8 @@ enum ft_layout_version_e {
     FT_LAYOUT_VERSION_21 = 21, // Ming: Add max_msn_in_ft to header,
                                //       Removed log suppression logentry
     FT_LAYOUT_VERSION_22 = 22, // Ming: Add oldest known referenced xid to each ftnode, for better garbage collection
-    FT_LAYOUT_VERSION_23 = 23, // Riddler: change logentries that log transactions to store TXNID_PAIRs instead of TXNIDs
+    FT_LAYOUT_VERSION_23 = 23, // Ming: Fix upgrade path #5902
+    FT_LAYOUT_VERSION_24 = 24, // Riddler: change logentries that log transactions to store TXNID_PAIRs instead of TXNIDs
     FT_NEXT_VERSION,           // the version after the current version
     FT_LAYOUT_VERSION   = FT_NEXT_VERSION-1, // A hack so I don't have to change this line.
     FT_LAYOUT_MIN_SUPPORTED_VERSION = FT_LAYOUT_VERSION_13, // Minimum version supported