[PATCH] Don't create files for engines that don't need them
Introduce FIO_NULLIO as a way to control that from the io engine.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/filesetup.c b/filesetup.c
index 610981b..1f1259d 100644
--- a/filesetup.c
+++ b/filesetup.c
@@ -15,7 +15,7 @@
{
struct stat st;
- if (td->filetype != FIO_TYPE_FILE)
+ if (td->filetype != FIO_TYPE_FILE || (td->io_ops->flags & FIO_NULLIO))
return 0;
if (stat(f->file_name, &st) == -1)
@@ -332,29 +332,38 @@
if (td->io_ops->flags & FIO_NETIO)
return 0;
- if (td->odirect)
- flags |= OS_O_DIRECT;
- if (td->sync_io)
- flags |= O_SYNC;
- if (td_write(td) || td_rw(td)) {
- flags |= O_RDWR;
+ /*
+ * we need a valid file descriptor, but don't create a real file.
+ * lets just dup stdout, seems like a sensible approach.
+ */
+ if (td->io_ops->flags & FIO_NULLIO)
+ f->fd = dup(STDOUT_FILENO);
+ else {
+ if (td->odirect)
+ flags |= OS_O_DIRECT;
+ if (td->sync_io)
+ flags |= O_SYNC;
- if (td->filetype == FIO_TYPE_FILE) {
- if (!td->overwrite)
- flags |= O_TRUNC;
-
- flags |= O_CREAT;
- }
-
- f->fd = open(f->file_name, flags, 0600);
- } else {
- if (td->filetype == FIO_TYPE_CHAR)
+ if (td_write(td) || td_rw(td)) {
flags |= O_RDWR;
- else
- flags |= O_RDONLY;
- f->fd = open(f->file_name, flags);
+ if (td->filetype == FIO_TYPE_FILE) {
+ if (!td->overwrite)
+ flags |= O_TRUNC;
+
+ flags |= O_CREAT;
+ }
+
+ f->fd = open(f->file_name, flags, 0600);
+ } else {
+ if (td->filetype == FIO_TYPE_CHAR)
+ flags |= O_RDWR;
+ else
+ flags |= O_RDONLY;
+
+ f->fd = open(f->file_name, flags);
+ }
}
if (f->fd == -1) {