Make sure mmaphuge file backed file is the size we need

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

diff --git a/memory.c b/memory.c
index be664c9c22a40285cd07c6f7f69da120408618d7..e5680389072e1f13910dea1b87a1d9c3bd7fd570 100644 (file)
--- a/memory.c
+++ b/memory.c
@@ -96,6 +96,11 @@ int allocate_io_mem(struct thread_data *td)
                                td->orig_buffer = NULL;
                                return 1;
                        }
                                td->orig_buffer = NULL;
                                return 1;
                        }

+                       if (ftruncate(td->mmapfd, td->orig_buffer_size) < 0) {
+                               td_verror(td, errno, "truncate mmap file");
+                               td->orig_buffer = NULL;
+                               return 1;
+                       }

                } else
                        flags |= OS_MAP_ANON;
 
                } else
                        flags |= OS_MAP_ANON;