7938 disable LBA weighting on files and SSDs
Reviewed by: Yuri Pankov <yuripv@gmx.com>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>

*** 151,160 ****
--- 151,161 ----
          vdev_t          **vdev_child;   /* array of children            */
          uint64_t        vdev_children;  /* number of children           */
          vdev_stat_t     vdev_stat;      /* virtual device statistics    */
          boolean_t       vdev_expanding; /* expand the vdev?             */
          boolean_t       vdev_reopening; /* reopen in progress?          */
+         boolean_t       vdev_nonrot;    /* true if SSD, file, or Virtio */
          int             vdev_open_error; /* error on last open          */
          kthread_t       *vdev_open_thread; /* thread opening children   */
          uint64_t        vdev_crtxg;     /* txg when top-level was added */
  
          /*