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>

*** 4426,4435 ****
--- 4426,4440 ----
          }
  
          return (err);
  }
  
+ /*
+  * Convert the zvol's volume size to an appropriate reservation.
+  * Note: If this routine is updated, it is necessary to update the ZFS test
+  * suite's shell version in reservation.kshlib.
+  */
  uint64_t
  zvol_volsize_to_reservation(uint64_t volsize, nvlist_t *props)
  {
          uint64_t numdb;
          uint64_t nblocks, volblocksize;