ceph/src/common/config_validators.cc

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3
   4 #include "common/config_validators.h"
   5 #include "include/stringify.h"
   6 #include "include/rbd/features.h"
   7 #include <map>
   8 #include <sstream>
   9 #include <vector>
  10 #include <boost/algorithm/string.hpp>
  11 #include <boost/lexical_cast.hpp>
  12
  13 int validate(md_config_t::option_rbd_default_features_t *,
  14              std::string *value, std::string *error_message) {
  15   static const std::map<std::string, uint64_t> FEATURE_MAP = {
  16     {RBD_FEATURE_NAME_LAYERING, RBD_FEATURE_LAYERING},
  17     {RBD_FEATURE_NAME_STRIPINGV2, RBD_FEATURE_STRIPINGV2},
  18     {RBD_FEATURE_NAME_EXCLUSIVE_LOCK, RBD_FEATURE_EXCLUSIVE_LOCK},
  19     {RBD_FEATURE_NAME_OBJECT_MAP, RBD_FEATURE_OBJECT_MAP},
  20     {RBD_FEATURE_NAME_FAST_DIFF, RBD_FEATURE_FAST_DIFF},
  21     {RBD_FEATURE_NAME_DEEP_FLATTEN, RBD_FEATURE_DEEP_FLATTEN},
  22     {RBD_FEATURE_NAME_JOURNALING, RBD_FEATURE_JOURNALING},
  23     {RBD_FEATURE_NAME_DATA_POOL, RBD_FEATURE_DATA_POOL},
  24   };
  25   static_assert((RBD_FEATURE_DATA_POOL << 1) > RBD_FEATURES_ALL,
  26                 "new RBD feature added");
  27
  28   // convert user-friendly comma delimited feature name list to a bitmask
  29   // that is used by the librbd API
  30   uint64_t features = 0;
  31   error_message->clear();
  32
  33   try {
  34     features = boost::lexical_cast<decltype(features)>(*value);
  35
  36     uint64_t unsupported_features = (features & ~RBD_FEATURES_ALL);
  37     if (unsupported_features != 0ull) {
  38       features &= RBD_FEATURES_ALL;
  39
  40       std::stringstream ss;
  41       ss << "ignoring unknown feature mask 0x"
  42          << std::hex << unsupported_features;
  43       *error_message = ss.str();
  44     }
  45   } catch (const boost::bad_lexical_cast& ) {
  46     int r = 0;
  47     std::vector<std::string> feature_names;
  48     boost::split(feature_names, *value, boost::is_any_of(","));
  49     for (auto feature_name: feature_names) {
  50       boost::trim(feature_name);
  51       auto feature_it = FEATURE_MAP.find(feature_name);
  52       if (feature_it != FEATURE_MAP.end()) {
  53         features += feature_it->second;
  54       } else {
  55         if (!error_message->empty()) {
  56           *error_message += ", ";
  57         }
  58         *error_message += "ignoring unknown feature " + feature_name;
  59         r = -EINVAL;
  60       }
  61     }
  62
  63     if (features == 0 && r == -EINVAL) {
  64       features = RBD_FEATURES_DEFAULT;
  65     }
  66   }
  67   *value = stringify(features);
  68   return 0;
  69 }
  70