OS-1566 filesystem limits for ZFS datasets

*** 32,41 ****
--- 32,43 ----
  
  #ifdef  __cplusplus
  extern "C" {
  #endif
  
+ #define MAXLIMIT        ((uint64_t)-1)
+ 
  /*
   * For index types (e.g. compression and checksum), we want the numeric value
   * in the kernel, but the string value in userland.
   */
  typedef enum {