virtiofsd: Trim down imported files

There's a lot of the original fuse code we don't need; trim them down.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
with additional trimming by:
Signed-off-by: Misono Tomohiro <misono.tomohiro@jp.fujitsu.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Xiao Yang <yangx.jy@cn.fujitsu.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

tools/virtiofsd/fuse_common.h

@@ -28,10 +28,6 @@
 #define FUSE_MAKE_VERSION(maj, min)  ((maj) * 10 + (min))
 #define FUSE_VERSION FUSE_MAKE_VERSION(FUSE_MAJOR_VERSION, FUSE_MINOR_VERSION)
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 /**
  * Information about an open file.
  *
@@ -100,30 +96,6 @@ struct fuse_file_info {
 	uint32_t poll_events;
 };
 
-/**
- * Configuration parameters passed to fuse_session_loop_mt() and
- * fuse_loop_mt().
- */
-struct fuse_loop_config {
-	/**
-	 * whether to use separate device fds for each thread
-	 * (may increase performance)
-	 */
-	int clone_fd;
-
-	/**
-	 * The maximum number of available worker threads before they
-	 * start to get deleted when they become idle. If not
-	 * specified, the default is 10.
-	 *
-	 * Adjusting this has performance implications; a very small number
-	 * of threads in the pool will cause a lot of thread creation and
-	 * deletion overhead and performance may suffer. When set to 0, a new
-	 * thread will be created to service every operation.
-	 */
-	unsigned int max_idle_threads;
-};
-
 /**************************************************************************
  * Capability bits for 'fuse_conn_info.capable' and 'fuse_conn_info.want' *
  **************************************************************************/
@@ -802,10 +774,6 @@ void fuse_remove_signal_handlers(struct fuse_session *se);
 #  error only API version 30 or greater is supported
 #endif
 
-#ifdef __cplusplus
-}
-#endif
-
 
 /*
  * This interface uses 64 bit off_t.