3749 zfs event processing should work on R/O root filesystems
Submitted by:   Justin Gibbs <justing@spectralogic.com>
Reviewed by:    Matthew Ahrens <mahrens@delphix.com>
Reviewed by:    Eric Schrock <eric.schrock@delphix.com>

*** 236,245 ****
--- 236,246 ----
          uint64_t        spa_deadman_calls;      /* number of deadman calls */
          uint64_t        spa_sync_starttime;     /* starting time fo spa_sync */
          uint64_t        spa_deadman_synctime;   /* deadman expiration timer */
          kmutex_t        spa_iokstat_lock;       /* protects spa_iokstat_* */
          struct kstat    *spa_iokstat;           /* kstat of io to this pool */
+         hrtime_t        spa_ccw_fail_time;      /* Conf cache write fail time */
          /*
           * spa_refcnt & spa_config_lock must be the last elements
           * because refcount_t changes size based on compilation options.
           * In order for the MDB module to function correctly, the other
           * fields must remain in the same location.