OS-1566 filesystem limits for ZFS datasets

@@ -32,10 +32,12 @@
 
 #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 {