Add pread/pwrite support to sync engine

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/options.c b/options.c
index 82d5ff5..e151634 100644
--- a/options.c
+++ b/options.c
@@ -336,6 +336,9 @@
 			  { .ival = "sync",
 			    .help = "Use read/write",
 			  },
+			  { .ival = "psync",
+			    .help = "Use pread/pwrite",
+			  },
 #ifdef FIO_HAVE_LIBAIO
 			  { .ival = "libaio",
 			    .help = "Linux native asynchronous IO",