Merge from mysql-5.5 to mysql-5.6

Author: Sujatha Sivakumar

mysys/mf_iocache2.c

@@ -63,6 +63,8 @@ my_b_copy_to_file(IO_CACHE *cache, FILE *file)
       DBUG_RETURN(1);
     cache->read_pos= cache->read_end;
   } while ((bytes_in_cache= my_b_fill(cache)));
+  if(cache->error == -1)
+    DBUG_RETURN(1);
   DBUG_RETURN(0);
 }
 
@@ -219,6 +221,8 @@ size_t my_b_fill(IO_CACHE *info)
     info->error= 0;
     return 0;					/* EOF */
   }
+  DBUG_EXECUTE_IF ("simulate_my_b_fill_error",
+                   {DBUG_SET("+d,simulate_file_read_error");});
   if ((length= my_read(info->file,info->buffer,max_length,
                        info->myflags)) == (size_t) -1)
   {

mysys/my_read.c

@@ -1,4 +1,4 @@
-/* Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
+/* Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -49,6 +49,13 @@ size_t my_read(File Filedes, uchar *Buffer, size_t Count, myf MyFlags)
 #else
     readbytes= read(Filedes, Buffer, Count);
 #endif
+    DBUG_EXECUTE_IF ("simulate_file_read_error",
+                     {
+                       errno= ENOSPC;
+                       readbytes= (size_t) -1;
+                       DBUG_SET("-d,simulate_file_read_error");
+                       DBUG_SET("-d,simulate_my_b_fill_error");
+                     });
 
     if (readbytes != Count)
     {

sql/log_event.cc

@@ -12476,6 +12476,8 @@ Write_rows_log_event::do_exec_row(const Relay_log_info *const rli)
 #ifdef MYSQL_CLIENT
 void Write_rows_log_event::print(FILE *file, PRINT_EVENT_INFO* print_event_info)
 {
+  DBUG_EXECUTE_IF("simulate_cache_read_error",
+                  {DBUG_SET("+d,simulate_my_b_fill_error");});
   Rows_log_event::print_helper(file, print_event_info, "Write_rows");
 }
 #endif

sql/rpl_master.cc

@@ -2043,6 +2043,8 @@ bool show_binlogs(THD* thd)
       goto err;
     }
   }
+  if(index_file->error == -1)
+    goto err;
   mysql_bin_log.unlock_index();
   my_eof(thd);
   DBUG_RETURN(FALSE);