Index: file.c
===================================================================
--- file.c	(revision 7521)
+++ file.c	(working copy)
@@ -955,6 +955,8 @@
 					fs->filename = strdup(filename);
 				}
 				fs->vfs = NULL;
+				/* If truncated, we'll be at the beginning; if not truncated, then append */
+				f->seek(fs, 0, SEEK_END);
 			} else {
 				ast_log(LOG_WARNING, "Unable to rewrite %s\n", fn);
 				close(fd);