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

@@ -151,10 +151,11 @@
         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 */
 
         /*