5045 use atomic_{inc,dec}_* instead of atomic_add_*

*** 1542,1554 ****
                   * get it).
                   */
                  if (throttle_write) {
                          if (sema_tryp(&cmap->cmap_throttle_sem) == 0) {
                                  rw_exit(&sidp->sid_rwlock);
!                                 atomic_add_32(&cmap->cmap_waiters, 1);
                                  sema_p(&cmap->cmap_throttle_sem);
!                                 atomic_add_32(&cmap->cmap_waiters, -1);
                                  rw_enter(&sidp->sid_rwlock, RW_READER);
  
                          /*
                           * Now since we released the sid_rwlock the state may
                           * have transitioned underneath us. so check that again.
--- 1542,1554 ----
                   * get it).
                   */
                  if (throttle_write) {
                          if (sema_tryp(&cmap->cmap_throttle_sem) == 0) {
                                  rw_exit(&sidp->sid_rwlock);
!                                 atomic_inc_32(&cmap->cmap_waiters);
                                  sema_p(&cmap->cmap_throttle_sem);
!                                 atomic_dec_32(&cmap->cmap_waiters);
                                  rw_enter(&sidp->sid_rwlock, RW_READER);
  
                          /*
                           * Now since we released the sid_rwlock the state may
                           * have transitioned underneath us. so check that again.
*** 1678,1688 ****
                          sema_v(&cmap->cmap_throttle_sem);
                  return;
          }
          rw_exit(&sidp->sid_rwlock);
  
!         atomic_add_64((uint64_t *)&cmap->cmap_nchunks, 1);
  
          if ((cmap->cmap_maxsize != 0) &&
              ((cmap->cmap_nchunks * cmap->cmap_chunksz) > cmap->cmap_maxsize)) {
                  cmn_err(CE_WARN, "fssnap_write_taskq: snapshot %d (%s) has "
                      "reached the maximum backing file size specified (%llu "
--- 1678,1688 ----
                          sema_v(&cmap->cmap_throttle_sem);
                  return;
          }
          rw_exit(&sidp->sid_rwlock);
  
!         atomic_inc_64((uint64_t *)&cmap->cmap_nchunks);
  
          if ((cmap->cmap_maxsize != 0) &&
              ((cmap->cmap_nchunks * cmap->cmap_chunksz) > cmap->cmap_maxsize)) {
                  cmn_err(CE_WARN, "fssnap_write_taskq: snapshot %d (%s) has "
                      "reached the maximum backing file size specified (%llu "