orangefs: remove vestigial async io code

I have verified that there is nothing in the userspace daemon version we
are implementing this protocol against that ever looks at this field.

Signed-off-by: Martin Brandenburg <[e-mail]>
Signed-off-by: Mike Marshall <[e-mail]>

fs/orangefs/file.c

···
 		return -ENOMEM;
 
 	/* synchronous I/O */
-	new_op->upcall.req.io.async_vfs_io = ORANGEFS_VFS_SYNC_IO;
 	new_op->upcall.req.io.readahead_size = readahead_size;
 	new_op->upcall.req.io.io_type = type;
 	new_op->upcall.req.io.refn = orangefs_inode->refn;

fs/orangefs/orangefs-kernel.h

···
 };
 
 /*
- * Defines for controlling whether I/O upcalls are for async or sync operations
- */
-enum ORANGEFS_async_io_type {
-	ORANGEFS_VFS_SYNC_IO = 0,
-	ORANGEFS_VFS_ASYNC_IO = 1,
-};
-
-/*
  * An array of client_debug_mask will be built to hold debug keyword/mask
  * values fetched from userspace.
  */

fs/orangefs/upcall.h

···
  * client-core and device
  */
 struct orangefs_io_request_s {
-	__s32 async_vfs_io;
+	__s32 __pad1;
 	__s32 buf_index;
 	__s32 count;
-	__s32 __pad1;
+	__s32 __pad2;
 	__s64 offset;
 	struct orangefs_object_kref refn;
 	enum ORANGEFS_io_type io_type;