3741 zfs needs better comments
Submitted by:   Will Andrews <willa@spectralogic.com>
Submitted by:   Justin Gibbs <justing@spectralogic.com>
Submitted by:   Alan Somers <alans@spectralogic.com>
Reviewed by:    Matthew Ahrens <mahrens@delphix.com>

*** 1026,1035 ****
--- 1026,1036 ----
                      flags | ZIO_FLAG_DONT_PROPAGATE);
  
          zio_buf_free(ubbuf, VDEV_UBERBLOCK_SIZE(vd));
  }
  
+ /* Sync the uberblocks to all vdevs in svd[] */
  int
  vdev_uberblock_sync_list(vdev_t **svd, int svdcount, uberblock_t *ub, int flags)
  {
          spa_t *spa = svd[0]->vdev_spa;
          zio_t *zio;