bk commit into 5.1 tree (jonas:1.2432) BUG#27102

[jonas]

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ChangeSet@stripped, 2007-03-13 21:03:34+01:00, jonas@stripped +1 -0
  ndb - bug#27102
    Make sure head after undo execute does not point to last page of file
    As this will confuse next write to group

  storage/ndb/src/kernel/blocks/lgman.cpp@stripped, 2007-03-13 21:03:32+01:00,
jonas@stripped +19 -0
    Make sure head after undo execute does not point to last page of file
    As this will confuse next write to group

# This is a BitKeeper patch.  What follows are the unified diffs for the
# set of deltas contained in the patch.  The rest of the patch, the part
# that BitKeeper cares about, is below these diffs.
# User:	jonas
# Host:	perch.ndb.mysql.com
# Root:	/home/jonas/src/51-telco-gca

--- 1.23/storage/ndb/src/kernel/blocks/lgman.cpp	2007-03-13 21:03:39 +01:00
+++ 1.24/storage/ndb/src/kernel/blocks/lgman.cpp	2007-03-13 21:03:39 +01:00
@@ -2924,6 +2924,25 @@
       ptr.p->m_file_pos[TAIL] = tail;
 
       init_logbuffer_pointers(ptr);
+
+      {
+	Buffer_idx head= ptr.p->m_file_pos[HEAD];
+	Ptr<Undofile> file;
+	m_file_pool.getPtr(file, head.m_ptr_i);
+	if (head.m_idx == file.p->m_file_size - 1)
+	{
+	  Local_undofile_list files(m_file_pool, ptr.p->m_files);
+	  if(!files.next(file))
+	  {
+	    jam();
+	    files.first(file);
+	  }
+	  head.m_idx = 0;
+	  head.m_ptr_i = file.i;
+	  ptr.p->m_file_pos[HEAD] = head;
+	}
+      }
+      
       ptr.p->m_free_file_words = (Uint64)File_formats::UNDO_PAGE_WORDS * 
 	(Uint64)compute_free_file_pages(ptr);
       ptr.p->m_next_reply_ptr_i = ptr.p->m_file_pos[HEAD].m_ptr_i;