ceph/src/mds/cephfs_features.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 <array>
   5 #include "cephfs_features.h"
   6 #include "mdstypes.h"
   7
   8 static const std::array feature_names
   9 {
  10   "reserved",
  11   "reserved",
  12   "reserved",
  13   "reserved",
  14   "reserved",
  15   "jewel",
  16   "kraken",
  17   "luminous",
  18   "mimic",
  19   "reply_encoding",
  20   "reclaim_client",
  21   "lazy_caps_wanted",
  22   "multi_reconnect",
  23   "deleg_ino",
  24   "metric_collect",
  25   "alternate_name",
  26   "notify_session_state",
  27   "op_getvxattr",
  28 };
  29 static_assert(feature_names.size() == CEPHFS_FEATURE_MAX + 1);
  30
  31 std::string_view cephfs_feature_name(size_t id)
  32 {
  33   if (id > feature_names.size())
  34     return "unknown";
  35   return feature_names[id];
  36 }
  37
  38 int cephfs_feature_from_name(std::string_view name)
  39 {
  40   if (name == "reserved") {
  41     return -1;
  42   }
  43   for (size_t i = 0; i < feature_names.size(); ++i) {
  44     if (name == feature_names[i])
  45       return i;
  46   }
  47   return -1;
  48 }
  49
  50 std::string cephfs_stringify_features(const feature_bitset_t& features)
  51 {
  52   CachedStackStringStream css;
  53   bool first = true;
  54   *css << "{";
  55   for (size_t i = 0; i < feature_names.size(); ++i) {
  56     if (!features.test(i))
  57       continue;
  58     if (!first)
  59       *css << ",";
  60     *css << i << "=" << cephfs_feature_name(i);
  61     first = false;
  62   }
  63   *css << "}";
  64   return css->str();
  65 }
  66
  67 void cephfs_dump_features(ceph::Formatter *f, const feature_bitset_t& features)
  68 {
  69   for (size_t i = 0; i < feature_names.size(); ++i) {
  70     if (!features.test(i))
  71       continue;
  72     char s[18];
  73     snprintf(s, sizeof(s), "feature_%zu", i);
  74     f->dump_string(s, cephfs_feature_name(i));
  75   }
  76 }
  77