OS-1566 filesystem limits for ZFS datasets

*** 959,968 ****
--- 959,986 ----
                              propname);
                          (void) zfs_error(hdl, EZFS_PROPREADONLY, errbuf);
                          goto error;
                  }
  
+                 /*
+                  * Special handling for "xxx_limit=none". In this case its not
+                  * 0 but MAXLIMIT.
+                  */
+                 if ((prop == ZFS_PROP_FILESYSTEM_LIMIT ||
+                     prop == ZFS_PROP_SNAPSHOT_LIMIT) &&
+                     nvpair_type(elem) == DATA_TYPE_STRING) {
+                         (void) nvpair_value_string(elem, &strval);
+                         if (strcmp(strval, "none") == 0) {
+                                 if (nvlist_add_uint64(ret, propname,
+                                     MAXLIMIT) != 0) {
+                                         (void) no_memory(hdl);
+                                         goto error;
+                                 }
+                                 continue;
+                         }
+                 }
+ 
                  if (zprop_parse_value(hdl, elem, prop, type, ret,
                      &strval, &intval, errbuf) != 0)
                          goto error;
  
                  /*
*** 2213,2222 ****
--- 2231,2262 ----
                                  (void) snprintf(propbuf, proplen, "%llu",
                                      (u_longlong_t)val);
                          else
                                  zfs_nicenum(val, propbuf, proplen);
                  }
+                 break;
+ 
+         case ZFS_PROP_FILESYSTEM_LIMIT:
+         case ZFS_PROP_SNAPSHOT_LIMIT:
+ 
+                 if (get_numeric_property(zhp, prop, src, &source, &val) != 0)
+                         return (-1);
+ 
+                 /*
+                  * If limit is MAXLIMIT, we translate this into 'none' (unless
+                  * literal is set), and indicate that it's the default value.
+                  * Otherwise, we print the number nicely and indicate that its
+                  * set locally.
+                  */
+                 if (literal) {
+                         (void) snprintf(propbuf, proplen, "%llu",
+                             (u_longlong_t)val);
+                 } else if (val == MAXLIMIT) {
+                         (void) strlcpy(propbuf, "none", proplen);
+                 } else {
+                         zfs_nicenum(val, propbuf, proplen);
+                 }
                  break;
  
          case ZFS_PROP_REFRATIO:
          case ZFS_PROP_COMPRESSRATIO:
                  if (get_numeric_property(zhp, prop, src, &source, &val) != 0)